® Note This manual applies to SN 6560XXX and higher. HYDRA 2620A Data Acquisition Unit 2625A Data Logger 2635A Data Bucket Service Manual PN 202231 February 1997 © 1997 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
LIMITED WARRANTY & LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs and services are warranted for 90 days.
Caution This is an IEC Safety Class 1 product. Before using, the ground wire in the line cord or the rear panel binding post must be connected for safety. Interference Information This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer’s instructions, may cause interference to radio and television reception.
Safety Summary Safety Terms in this Manual This instrument has been designed and tested in accordance with IEC Publication 1010, Safety Requirements for Electronical Measuring, Control and Laboratory Equipment. This Service Manual contains information, warnings, and cautions that must be followed to ensure safe operation and to maintain the instrument in a safe condition. Use of this equipment in a manner mot specified herein may impair the protection by the equipment.
Use the Proper Fuse To avoid fire hazard, use only a fuse identical in type, voltage rating, and current rating as specified on the rear panel fuse rating label. Grounding the Standard The instrument utilized controlled overvoltage techniques that require the instrument to be grounded whenever normal mode or common mode ac voltage or transient voltages may occur.
Table of Contents Chapter 1 Title Introduction and Specifications........................................................ 1-1 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. 2 Page Introduction ......................................................................................... Options and Accessories ..................................................................... Operating Instructions ......................................................................... Organization of the Service Manual ..............
HYDRA Service Manual 2-32. 2-43. 2-44. 2-45. 2-46. 2-47. 2-48. 2-49. 2-50. 2-51. 2-52. 2-58. 2-59. 2-60. 2-61. 2-62. 2-63. 2-64. 2-65. 2-66. 2-67. 2-68. 2-69. 2-70. 2-71. 2-72. 2-73. 2-74. 2-75. 2-76. 2-77. 2A Digital Kernel ............................................................................. Digital I/O ................................................................................... Digital Input Threshold .............................................................. Digital Input Buffers ..
Contents (continued) 2A-22. 2A-23. 2A-31. 2A-42. 2A-43. 2A-44. 2A-45. 2A-46. 2A-47. 2A-48. 2A-49. 2A-50. 2A-51. 2A-57. 2A-58. 2A-59. 2A-60. 2A-61. 2A-62. 2A-63. 2A-64. 2A-65. 2A-66. 2A-67. 2A-68. 2A-69. 2A-70. 2A-71. 2A-72. 2A-73. 2A-74. 3 Main PCA ........................................................................................ Power Supply Circuit Description............................................... Digital Kernel .............................................................................
HYDRA Service Manual 3-22. 3-23. 3-24. 3-25. 3-26. 3-27. 3-28. 3-29. 3-30. 3-31. 4 3-13 3-13 3-14 3-14 3-14 3-15 3-15 3-15 3-15 3-15 Performance Testing and Calibration............................................... 4-1 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 4-14. 4-15. 4-16. 4-17. 4-18. 4-19. 4-20. 4-21. 4-22. 4-23. 4-24. 4-25. 4-26. 4-28. 4-29. 4-30. 4-31. 4-32. 4-33. 4-34. 5 Install Miscellaneous Chassis Components ....................................
Contents (continued) 5-7. 5-8. 5-9. 5-10. 5-11. 5-12. 5-13. 5-14. 5-15. 5-16. 5-17. 5-18. 5-19. 5-20. 5-21. 5-22. 5-23. 5-24. 5-25. 5-26. 5-27. 5-28. 5-29. 5A Power Fail Detection ....................................................................... 5-Volt Switching Supply.................................................................. Inverter ............................................................................................ Analog Troubleshooting ...........................................
HYDRA Service Manual 5A-30. 5A-31. 5A-32. 6 List of Replaceable Parts .................................................................. 6-1 6-1. 6-2. 6-3. 6-4. 6-5. 7 Failure to Illuminate the Battery Led .......................................... 5A-31 Failure to Write to Memory Card................................................ 5A-32 Write/Read Memory Card Test (Destructive) ............................. 5A-32 Introduction ...........................................................................
List of Tables Table 1-1. 1-2. 1-3. 1-4. 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 2A-1. 2A-2. 2A-3. 2A-4. 2A-5. 2A-6. 2A-7. 2A-8. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 5-1. 5-2. Title Page Hydra Features......................................................................................................... 1-6 Accessories ............................................................................................................ 1-7 2620A/2625A Specifications..............
HYDRA Service Manual 5-3. 5-4. 5-5. 5-6. 5-7. 5-8. 5-9. 5-10. 5A-1. 5A-2. 5A-3. 5A-4. 5A-5. 5A-6. 5A-7. 5A-8. 5A-9. 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 6-9. 6-10. 7-1. 7-2. Power Supply Troubleshooting Guide................................................................... DC Volts HI Troubleshooting ............................................................................... AC Volts HI Troubleshooting ...............................................................................
List of Figures Figure 2-1. 2-2. 2-3. 2-5. 2-6. 2-7. 2-8. 2-9. 2-10. 2A-1. 2A-2. 2A-3. 2A-4. 2A-5. 2A-6. 2A-7. 2A-8. 2A-9. 2A-10. 3-1. 3-3. 3-3. 3-5. 3-5. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 5-1. 5-2. 5-3. 5-5. 5-5. Title Page Interconnect Diagram ............................................................................................ Overall Functional Block Diagram........................................................................ Analog Simplified Schematic Diagram.................................
HYDRA Service Manual 5-6. 5-7. 5-8. 5-9. 5-10. 5-11. 5A-1. 5A-2. 5A-3. 5A-4. 5A-5. 5A-5. 5A-6. 5A-7. 5A-8. 5A-9. 5A-10. 5A-11. 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 6-8. 6-9. 6-10. 7-1. 8-1. 8-2. 8-3. 8-4. 8-5. 8-6. 8-7. 8-8. Integrator Output ................................................................................................... Microprocessor Timing ......................................................................................... Test Points, Display PCA (A2)............................
Chapter 1 Introduction and Specifications Title 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. Introduction .......................................................................................... Options and Accessories ...................................................................... Operating Instructions .......................................................................... Organization of the Service Manual..................................................... Conventions...................................
HYDRA Service Manual 1-2
Introduction and Specifications Introduction 1 1-1. Introduction Hydra measures analog inputs of dc and ac volts, thermocouple and RTD temperatures, resistance, and frequency. It features 21 measurement input channels. In addition, it contains eight digital input/output lines, one totalizing input, one external scan trigger input, and four alarm output lines. Hydra is fully portable and can be ac or dc powered. An RS-232 computer interface is standard.
HYDRA Service Manual 1-4. Organization of the Service Manual This manual focuses on performance tests, calibration procedures, and component-level repair of each of the instruments. To that end, manual sections are often interdependent; effective troubleshooting may require not only reference to the troubleshooting procedures in Section 5, but also some understanding of the detailed Theory of Operation in Section 2 and some tracing of circuit operation in the Schematic Diagrams presented in Section 8.
Introduction and Specifications Conventions 1 Chapter 7. IEEE-488 Option (2620A only) This chapter describes the IEEE-488 option. Included are specifications, theory of operation, maintenance, and a list of replaceable parts. Schematic diagrams for this option are included at the end of the overall Service Manual (Chapter 8). Chapter 8. Schematic Diagrams Includes schematic diagrams for all standard and optional assemblies.
HYDRA Service Manual Table 1-1. Hydra Features • Channel Scanning Can be continuous scanning, scanning at an interval time, single scans, or triggered (internal or external) scans. • Channel Monitoring Make measurements on a single channel and view these measurements on the display. • Channel Scanning and Monitoring View measurements made for the monitor channel while scanning of all active channels continues.
Introduction and Specifications Specifications 1 Table 1-2. Accessories Model 80i-410 Description Clamp-On DC/AC Current Probes 80i-1010 80J-10 Current Shunt 2620A-05K Field-installable IEEE-488 Option kit (Hydra Data Acquisition Unit only.) 2620A-100 Extra I/O Connector Set: Includes Universal Input Module, Digital I/O and Alarm Output Connectors. 262XA-801 Diconix(R) 80-column serial printer. 263XA-803 Memory Card Reader for IBM-PC or compatible personal computer.
HYDRA Service Manual Table 1-3. 2620A/2625A Specifications The instrument specifications presented here are applicable within the conditions listed in the Environmental portion of this specification.
Introduction and Specifications Specifications 1 Table 1-3. 2620A/2625A Specifications (cont) Thermocouple Inputs Accuracy (±°C)* Thermocouple 18°C to 28°C 90 Days Slow 1 Year Slow 1 Year Fast 1 Year Slow 1 Year Fast -100.00 0.00 760.00 0.49 0.38 0.49 0.53 0.40 0.54 1.00 0.77 0.97 0.73 0.53 0.91 1.22 0.91 1.35 -100.00 0.00 1000.00 1372.00 0.57 0.42 0.73 0.95 0.60 0.44 0.80 1.05 1.20 0.88 1.46 1.89 0.82 0.57 1.36 1.85 1.43 1.02 2.03 2.70 -100.00 0.00 400.00 1300.00 0.66 0.51 0.46 0.
HYDRA Service Manual Table 1-3. 2620A/2625A Specifications (cont) Thermocouple Inputs (cont) Input Impedance 100 MΩ minimum in parallel with 150 pF maximum Common Mode and Normal Mode Rejection See Specifications, DC Voltage Inputs Crosstalk Rejection Refer to "Crosstalk Rejection" at the end of this table. Open Thermocouple Detect Small ac signal injection and detection scheme before each measurement detects greater than 1 to 4 kΩ as open. Performed on each channel unless defeated by computer command.
Introduction and Specifications Specifications 1 Table 1-3. 2620A/2625A Specifications (cont) AC Voltage Inputs (True RMS AC Voltage, AC-Coupled Inputs) Resolution Range Slow Fast Minimum Input for Rated Accuracy 300 mV 10 µV 100 µV 20 mV 3V 100 µV 1 mV 200 mV 30V 1 mV 10 mV 2V 300V 10 mV 100 mV 20V 1 Year Accuracy ±(%±V) Frequency 18°C to 28°C SLow 0°C to 60°C Fast Slow Fast 1.43% + 0.25 mV 0.30% + 0.25 mV 0.17% + 0.25 mV 0.37% + 0.25 mV 1.9% + 0.30 mV 5.0% + 0.50 mV 1.43% + 0.
HYDRA Service Manual Table 1-3. 2620A/2625A Specifications (cont) AC Voltage Inputs (True RMS AC Voltage, AC-Coupled Inputs) (cont) Maximum Frequency Input at Upper Frequency 20 Hz - 50 Hz 50 Hz - 100 Hz 100 Hz - 10 kHz 10 kHz - 20 kHz 20 kHz - 50 kHz 50 kHz - 100 kHz 300V rms 300V rms 200V rms 100V rms 40V rms 20V rms Input Impedance 1 MΩ in parallel with 100 pF maximum Maximum Crest Factor 3.0 maximum 2.
Introduction and Specifications Specifications 1 Table 1-3. 2620A/2625A Specifications (cont) Ohms Input Resolution Range Slow Typical Full Scale Voltage Fast Maximum Current Through Unknown Maximum Open Circuit Voltage 300Ω 10 mΩ 0.1Ω 0.22V 1 mA 3.2V 3 kΩ 0.1Ω 1Ω 0.25V 110 µA 1.5V 30 kΩ 1Ω 10Ω 0.29V 13 µA 1.5V 300 kΩ 10Ω 100Ω 0.68V 3.2 µA 3.2V 3 MΩ 100Ω 1 kΩ 2.25V 3.2 µA 3.2V 10 MΩ 1 kΩ 10 kΩ 2.72V 3.2 µA 3.
HYDRA Service Manual Table 1-3.
Introduction and Specifications Specifications 1 Table 1-3. 2620A/2625A Specifications (cont) Maximum Autoranging Time (Seconds per Channel) Function VDC VAC Ohms Range Change Slow Fast 300 mV to 150V 0.25 0.19 150V to 300 mV 0.25 0.18 300 mV to 150V 1.40 1.10 150V to 300 mV 1.40 1.10 300Ω to 10.0 MΩ 1.70 0.75 10.0 MΩ to 300Ω 1.70 0.60 Totalizing Inputs Input Voltage 30V maximum -4V minimum 2V peak minimum signal Isolation None dc-coupled Threshold 1.
HYDRA Service Manual Table 1-3. 2620A/2625A Specifications (cont) Digital and Alarm Outputs Output Logic Levels Logical "zero": Logical "one": 0.8V max for an Iout of -1.0 mA (1 LSTTL load) 3.8V min for an Iout of 0.05 mA (1 LSTTL load) For non-TTL loads: Logical "zero": Isolation 1.8V max for an Iout of -20 mA 3.
Introduction and Specifications Specifications 1 Table 1-3. 2620A/2625A Specifications (cont) Memory Life 10 years minimum over Operating Temperature range Stores: real-time clock, set-up configuration, and measurement data Common Mode Voltage 300V dc or ac rms maximum from any analog input(channel) to earth provided that channel to channel maximum voltage ratings are observed.
HYDRA Service Manual Table 1-3. 2620A/2625A Specifications (cont) 2620A Options IEEE-488 (Option -05K) Capability codes:SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT1, E1, TE0, LE0 and C0 Complies with IEEE-488.1 standard Crosstalk Rejection AC signals can have effects on other channels(crosstalk). These effects are discussed here by measurement function. These numbers should only be considered as references.
Introduction and Specifications Specifications 1 Table 1-3. 2620A/2625A Specifications (cont) AC Signal Crosstalk into an Ohms Channel AC Frequency = 50, 60 Hz, ±0.1% Ohmss (error ) OHMS Error Ratio = VAC rms (crosstalk ) Range Ratio (worst case) -5 Ohms -6 kOhms -4 kOhms -3 kOhms -4 MOhms -3 MOhms 300.00Ω 3.3 x 10 VAC rms 3.000 kΩ 2.4 x 10 VAC rms 30.000 kΩ 3.1 x 10 VAC rms 300.00 kΩ 5.6 x 10 VAC rms 3.0000 MΩ 3.
HYDRA Service Manual Table 1-4. 2635A Specifications The instrument specifications presented here are applicable within the conditions listed in the Environmental portion of this specification.
Introduction and Specifications Specifications 1 Table 1-4. 2635A Specifications (cont) Input Impedance 100 MΩ minimum in parallel with 150 pF maximum for all ranges 3V and below 10 MΩ in parallel with 100 pF maximum for the 30V and 300V ranges. Normal Mode Rejection 53 dB minimum at 60 Hz ±0.1%, slow rate 47 dB minimum at 50 Hz ±0.1%, slow rate Common Mode Rejection 120 dB minimum at dc, 1 kΩ imbalance, slow rate 120 dB minimum at 50 or 60 Hz ±0.
HYDRA Service Manual Table 1-4. 2635A Specifications (cont) Thermocouple Inputs Temperature Measurements - Accuracy (Thermocouples) (IPTS-68) Accuracy (±°C)* Thermocouple 18°C to 28°C Type Temperature (°C) 90 Days Slow 1 Year Slow 1 Year Fast 1 Year Slow 1 Year Fast J -100 to -30 -30 to 150 150 to 760 0.44 0.40 0.52 0.45 0.42 0.56 0.87 0.78 0.99 0.54 0.58 0.92 1.05 1.00 1.39 -100 to -25 -25 to 120 120 to 1000 1000 to 1372 0.53 0.46 0.94 1.24 0.54 0.47 1.00 1.34 1.08 0.92 1.66 2.16 0.
Introduction and Specifications Specifications 1 Table 1-4. 2635A Specifications (cont) Thermocouple Inputs Temperature Measurements - Accuracy (Thermocouples) (ITS-90) Accuracy (±°C)* Thermocouple 18°C to 28°C 0°C to 60°C Type Temperature (°C) 90 Days Slow 1 Year Slow 1 Year Fast 1 Year Slow 1 Year Fast J -100 to -30 -30 to 150 150 to 760 0.44 0.41 0.51 0.45 0.43 0.55 0.88 0.79 0.98 0.54 0.59 0.91 1.06 1.01 1.39 -100 to -25 -25 to 120 120 to 1000 1000 to 1372 0.54 0.47 0.75 1.11 0.
HYDRA Service Manual Table 1-4. 2635A Specifications (cont) Thermocouple Inputs (cont) Input Impedance 100 MΩ minimum in parallel with 150 pF maximum Common Mode and Normal Mode Rejection See Specifications, DC Voltage Inputs Crosstalk Rejection Refer to "Crosstalk Rejection" at the end of Table 1-3. Open Thermocouple Detect Small ac signal injection and detection scheme before each measurement detects greater than 1 to 4 kΩ as open. Performed on each channel unless defeated by computer command.
Introduction and Specifications Specifications 1 Table 1-4. 2635A Specifications (cont) AC Voltage Inputs (True RMS AC Voltage, AC-Coupled Inputs) Resolution Range Slow Fast Minimum Input for Rated Accuracy 300 mV 10 µV 100 µV 20 mV 3V 100 µV 1 mV 200 mV 30V 1 mV 10 mV 2V 150/300V 10 mV 100 mV 20V 1 Year Accuracy ±(%±V) Frequency 18°C to 28°C SLow 0°C to 60°C Fast Slow Fast 1.43% + 0.25 mV 0.30% + 0.25 mV 0.17% + 0.25 mV 0.37% + 0.25 mV 1.9% + 0.30 mV 5.0% + 0.50 mV 1.43% + 0.
HYDRA Service Manual Table 1-4. 2635A Specifications (cont) AC Voltage Inputs (True RMS AC Voltage, AC-Coupled Inputs) (cont) Maximum Frequency Input at Upper Frequency 20 Hz - 50 Hz 50 Hz - 100 Hz 100 Hz - 10 kHz 10 kHz - 20 kHz 20 kHz - 50 kHz 50 kHz - 100 kHz 300V rms 300V rms 200V rms 100V rms 40V rms 20V rms Input Impedance 1 MΩ in parallel with 100 pF maximum Maximum Crest Factor 3.0 maximum 2.
Introduction and Specifications Specifications 1 Table 1-4. 2635A Specifications (cont) Ohms Input Resolution Range Slow Typical Full Scale Voltage Fast Maximum Current Through Unknown Maximum Open Circuit Voltage 300Ω 10 mΩ 0.1Ω 0.22V 1 mA 3.2V 3 kΩ 0.1Ω 1Ω 0.25V 110 µA 1.5V 30 kΩ 1Ω 10Ω 0.29V 13 µA 1.5V 300 kΩ 10Ω 100Ω 0.68V 3.2 µA 3.2V 3 MΩ 100Ω 1 kΩ 2.25V 3.2 µA 3.2V 10 MΩ 1 kΩ 10 kΩ 2.72V 3.2 µA 3.
HYDRA Service Manual Table 1-4.
Introduction and Specifications Specifications 1 Table 1-4. 2635A Specifications (cont) Maximum Autoranging Time (Seconds per Channel) Function VDC VAC Ohms Range Change Slow Fast 300 mV to 150V 0.25 0.19 150V to 300 mV 0.25 0.18 300 mV to 150V 1.40 1.10 150V to 300 mV 1.40 1.10 300Ω to 10.0 MΩ 1.70 0.75 10.0 MΩ to 300Ω 1.50 0.60 Totalizing Inputs Input Voltage 30V maximum -4V minimum 2V peak minimum signal Isolation None dc-coupled Threshold 1.
HYDRA Service Manual Table 1-4. 2635A Specifications (cont) Digital and Alarm Outputs Output Logic Levels Logical "zero": Logical "one": 0.8V max for an Iout of -1.0 mA (1 LSTTL load) 3.8V min for an Iout of 0.05 mA (1 LSTTL load) For non-TTL loads: Logical "zero": Isolation 1.8V max for an Iout of -20 mA 3.25V max for an Iout of -50 mA None Real-Time Clock and Calendar Accuracy Within 1 minute per month for 0°C to 50°C range Battery Life >10 unpowered instrument years for 0°C to 28°C (32°F to 82.
Introduction and Specifications Specifications 1 Table 1-4. 2635A Specifications (cont) General Channel Capacity 21 Analog Inputs 4 Alarm Outputs 8 Digital I/O (Inputs/Outputs) Measurement Speed Slow rate: Fast rate: 4 readings/second nominal 17 readings/second nominal 1.5 readings/second nominal for ACV and high-Ω inputs For additional information, refer to Typical Scanning Rate and Maximum Autoranging Time. Nonvolatile Memory Life >10 unpowered instrument years for 0°C to 28°C (32°F to 82.4°F).
HYDRA Service Manual 1-32
Chapter 2 Theory of Operation (2620A/2625A) Title 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 2-9. 2-10. 2-11. 2-12. 2-13. 2-14. 2-15. 2-16. 2-17. 2-18. 2-19. 2-20. 2-21. 2-22. 2-23. 2-24. 2-32. 2-43. 2-44. 2-45. 2-46. Introduction .......................................................................................... Functional Block Description............................................................... Main PCA Circuitry.........................................................................
HYDRA Service Manual 2-47. 2-48. 2-49. 2-50. 2-51. 2-52. 2-58. 2-59. 2-60. 2-61. 2-62. 2-63. 2-64. 2-65. 2-66. 2-67. 2-68. 2-69. 2-70. 2-71. 2-72. 2-73. 2-74. 2-75. 2-76. 2-77. 2-2 Totalizer Input ............................................................................. External Trigger Input Circuits.................................................... A/D Converter PCA ......................................................................... Analog Measurement Processor .............................
Theory of Operation (2620A/2625A) Introduction 2 2-1. Introduction The theory of operation begins with a general overview of the instrument and progresses to a detailed description of the circuits of each pca. The instrument is first described in general terms with a Functional Block Description. Then, each block is detailed further (often to the component level) with Detailed Circuit Descriptions. Refer to Section 8 of this manual for full schematic diagrams.
HYDRA Service Manual DIGITAL I/O AND TOTALIZE INPUT ALARM OUTPUTS SCAN TRIGGER INPUT AC IN RS-232 J4 J1 DISPLAY J6 J5 J3 J2 MAIN MEMORY P1 2625A ONLY P1 2620A ONLY J1 REAR PANEL IEEE P10 CHANNEL 0 CHANNELS 11…20 J10 TB1 TB2 ANALOG INPUT CONNECTOR P1 J1 A/D CONVERTER P2 J2 CHANNELS 1…10 S1F.EPS Figure 2-1.
Theory of Operation (2620A/2625A) Functional Block Description 2 ANALOG INPUT CONNECTOR INPUT MULTIPLEXING INPUT PROTECTION INPUT SIGNAL CONDITIONING ANALOG MEASUREMENT PROCESSOR (A/D CONVERTER) MICRO CONTROLLER INGUARD SERIAL OUTGUARD COMMUNICATION A/D CONVERTER PCA GUARD CROSSING DIGITAL I/O VACUUM FLUORESCENT DISPLAY RS-232 DISPLAY CONTROLLER µP RAM ROM IEEE-488 OPTION -05 (2620A ONLY) CALENDAR CLOCK FRONT PANEL SWITCHES EEPROM CALIBRATION CONSTANTS DISPLAY ASSEMBLY MEMORY (2625A ON
HYDRA Service Manual 2-6. Serial Communication (Guard Crossing) This functional block provides a high isolation voltage communication path between the Digital Kernel of the Main PCA and the microcontroller on the A/D Converter PCA. This bidirectional communication circuit requires power supply voltages from the Power Supply block. 2-7.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 2-14. Channel Selection Circuitry This circuitry consists of a set of relays and relay-control drivers. The relays form a tree that routes the input channels to the measurement circuitry. Two of the relays are also used to switch between 2-wire and 4-wire operation. 2-15.
HYDRA Service Manual 2-24. Power Supply Circuit Description The Hydra power supply consists of three major sections: • Raw DC Supply The raw dc supply converts line voltage (90V to 264V ac) to a dcoutput of 7.5V to 35V. • 5V Switcher Supply The 5V switching supply regulates the 7.5 to 35V dc input to anominal 5.1V ±0.25V dc (VCC). • Inverter Using the 5V switching supply output, the inverter generates the -30Vdc, -5V dc, and 5.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 Dual inductor A1T2 regulates the current that flows from the raw supply to the load as the switching transistor in A1U9 is turned on and off. Complementary switch A1CR10 conducts when the switching transistor is off. The pulse-width modulator comparator in A1U9 compares the output to the reference and sets the ON-time/OFF-time ratio to regulate the output to 5.1V dc.
HYDRA Service Manual amplifier. A1VR2 is the reference for the positive supply. A1R14 provides the current to bias the reference zener. A1C4 is the output filter, and A1C9 provides frequency compensation of the regulator circuit. Transistor A1Q1 and resistor A1R13 make up the current-limit circuit. When the voltage across A1R13 increases enough to turn on A1Q1, output current is limited by removing the base drive to A1Q2. The -5.4 volt regulator operates like the +5.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 The Microprocessor communicates to the Microcontroller on the A/D Converter PCA (via the Serial Communication circuit) using an asynchronous communication protocol at 4800 baud. Communication to the Microcontroller (A3U9) originates at A1U4-11. Communication from the A/D’s Microcontroller to the Microprocessor appears at A1U410.
HYDRA Service Manual phototransistor base discharges through A1R16. With this arrangement, the rise and fall times of the phototransistor collector signal are nearly symmetrical. The transmission of data from the Microcontroller (A3U9) to the Microprocessor (A1U4) is accomplished via the circuit made up of A3Q1, A3R7, A1U5, A1R7, and A1R3. The transmit output from the Microcontroller (A3U9-14) is inverted by A3Q1, which drives the optocoupler LED (A1U5-2) through resistor A3R7.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 2-39. EEPROM The EEPROM contains 64 registers, each of which is 16 bits long. These registers are used to provide nonvolatile storage of some of the instrument configuration information and all of the calibration information. When the Microprocessor is communicating to the EEPROM, Chip Select input (A1U1-1) is driven high to enable the EEPROM interface.
HYDRA Service Manual Data Terminal Ready (DTR) is a modem control signal controlled by the Microprocessor. When the instrument is powered up, the Microprocessor port pin (A1U4-32) goes high, which results in the RS-232 driver output (A1U25-7) going to 5.0V dc. When the instrument has initialized the SCI and is ready to receive and transmit, A1U4-32 will go low, resulting in the RS-232 DTR signal (A1U25-7) going to +5.0V dc. The RS-232 DTR signal remains at +5.0V dc until the instrument is powered down.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 2-44. Digital Input Threshold 2-1. The Digital Input Threshold circuit sets the input threshold level for the Digital Input Buffers and the Totalizer Input. A software programmable voltage divider (A1U17, A1R35, A1R36, A1R37) and a unity gain buffer amplifier (A1AR1) are the main components in this circuit. The Microprocessor sets outputs A1U16-15 and A1U16-12 to select one of four input threshold levels.
HYDRA Service Manual 2-47. Totalizer Input The Totalizer Input circuit consists of Input Protection, a Digital Input Buffer circuit, and a Totalizer Debouncer circuit. The Digital Input Buffer for the totalizer is protected from electrostatic discharge (ESD) damage by A1R49 and A1C43. Refer to the detailed description of the Digital Input Buffer circuit for more information.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 The Analog Measurement Processor (A3U8) is a 68-pin CMOS device that, under control of the A/D Microcontroller (A3U9), performs the following functions: • Input signal routing • Input signal conditioning • Range switching • Passive filtering of dc voltage and resistance measurements • Active filtering of ac voltage measurements • A/D conversion • Support for direct volts, true rms ac volts, temperature, resistance,and frequency measurements
2-18 LO SENSE LO SOURCE HI SENSE HI SOURCE REFERENCE JUNCTION R43 R11 R10 K16 C31 Figure 2-3. Analog Simplified Schematic Diagram K17 Z4 R34 R35 R32 TO U9 300V 300Ω 15 14 19 R42 S16 7 6 5 OHMS VOLTAGE SOURCE TO REFERENCE RESISTOR 2 TO U9 28 29 30 31 32 33 S2 S3 TO OHMS SOURCE & RRS HI DIVIDER SWITCHING LOW 8 36 3.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 Table 2-4. Analog Measurement Processor Pin Descriptions Pin Name Description 1 2 3 4 5 VDD ACBO AIN AGND2 ACR4 +5.4V supply AC buffer output (not used) Analog ground AC buffer range 4 (300V) 6 7 8 9 10 ACR3 ACR2 ACR1 VSSA REFJ AC buffer range 3 (30V) AC buffer range 2 (3V) AC buffer range 1 (300 mV) -5.
HYDRA Service Manual Table 2-4. Analog Measurement Processor Pin Descriptions (cont) Pin Name Description 46 47 48 49 50 SUM B.1 B.32 B1 B3.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 Table 2-5. Function Relay States Relay Position Function A3K17 A3K16 A3K15 DC mV, 3V,Thermocouples Reset Set Set DC 30V, 300V Set Set Set ACV Set Set Reset Ohms, RTDs Reset Reset Set Frequency Set Set Reset 2-54. DC Volts and Thermocouples For the 3V and lower ranges (including thermocouples), the HI input signal is applied directly to the A3U8 analog processor through A3R11, A3K17, and A3R42.
HYDRA Service Manual S2 A3R11 A3K17 INPUT HI A3R10 A3Z4 10M S3 S9 S10 A3Z4 10.01k PASSIVE FILTER HIGH A/D A3R34 LOW A3K16 INPUT LO s4f.eps Figure 2-4. DC Volts 300V Range Simplified Schematic When an input is switched in for a measurement, the ohms source in Analog Processor A3U8 is set to the correct voltage for the range selected and is connected to the appropriate reference resistor in network A3Z4.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 OHMS VOLTAGE SOURCE IX LOW + VR REF – A/D INTEGRATE REFERENCE A3Z4 R REF REFERENCE RESISTOR A3R34 HIGH A3K16 A3RT1 & A3R10 A3R11 HI + VR X - A3R42 A3K17 PASSIVE FILTER RX UNKNOWN RESISTOR HIGH A/D INTEGRATE UNKNOWN LO LOW RX IX•RX VR X = = IX•RREF R REF VR REF s5f.eps Figure 2-5. Ohms Simplified Schematic The reference resistor for the 300-kΩ, 3-MΩ, and 10-MΩ ranges is the 1-MΩ resistor in A3Z4, which is selected by S15.
HYDRA Service Manual Since virtually no current flows through the sense path, no error voltages are developed that would add to the voltage across the unknown resistance; this 4-wire measurement technique eliminates user lead-wire and instrument relay contact and circuit board trace resistance errors. 2-56. AC Volts AC-coupled ac voltage inputs are scaled by the ac buffer, converted to dc by a true rms ac-to-dc converter, filtered, and then sent to the a/d converter. Refer to Figure 2-6.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 Table 2-6. AC Volts Input Signal Dividers Range Drive Signal A3Z3 Divider Resistor(s) Overall Gain 300 mV ACR1 111.1 kΩ 2.5 3V ACR2 12.25 kΩ || 111.1 kΩ 0.25 30V ACR3 1.013 kΩ || 111.1 kΩ 0.025 150/300V ACR4 none 0.0025 The output of the buffer is ac-coupled by A3C15 and A3C16 to the true-rms ac-to-dc converter A3U6.
HYDRA Service Manual 2-59. A/D Converter Figure 2-7 shows the dual slope a/d converter used in the instrument. The unknown input voltage is buffered and used to charge (integrate) a capacitor for an exact period of time. This integrator capacitor is then discharged by the buffered output of a stable and accurate reference voltage of opposite polarity.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 The current through the selected integrator input resistor charges integrator capacitor A3C13, with the current dependent on the buffer output voltage. After the integrate phase, the buffer is connected to the opposite polarity reference voltage, and the integrator integrates back toward zero capacitor voltage until the comparator trips. An internal counter measures this variable integrate time.
HYDRA Service Manual The coils for the relays are driven by the outputs of Darlington drivers A3U4, A3U5, A3U10, A3U11, and A3U12. The relays are switched when a 6-millisecond pulse is applied to the appropriate reset or set coil by the NPN Darlington drivers in these ICs. When the port pin of Microcontroller A3U9 connected to the input of a driver is set high, the output of the driver pulls one end of a relay set or reset coil low.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 2-64. Display PCA Display Assembly operation is classified into six functional circuit blocks: the Main PCA Connector, the Front Panel Switches, the Display, the Beeper Drive Circuit, the Watchdog Timer/Reset Circuit, and the Display Controller. These blocks are described in the following paragraphs. 2-65.
HYDRA Service Manual approximately 20 kΩ. Checking resistances between any two signals (SWR1 through SWR6) verifies proper termination by resistor network A2Z1. 2-67. Display The custom vacuum-fluorescent display (A2DS1) comprises a filament, 11 grids (numbered 0 through 10 from right to left on the display), and up to 14 anodes under each grid. The anodes make up the digits and annunciators for their respective area of the display. The grids are positioned between the filament and the anodes. A 5.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 4.75-second watchdog timeout period. Each time a low-to-high transition of DISTX is detected on A2U5-2, capacitor A2C2 is discharged to restart the timeout period. If there are no low-to-high transitions on DISTX during the 4.75-second period, A2U5-13 transitions from high to low, triggers the other half of A2U5, and causes output A2U5-12 to go low. A2U5-12 is then inverted by A2U6 to drive the RESET signal high, causing a system reset.
HYDRA Service Manual Table 2-8. Display Initialization Modes A2TP4 A2TP5 1 1 0 0 Power-Up Display Initialization 1 0 1 0 All Segments OFF All Segments ON (default) Display Test Pattern #1 Display Test Pattern #2 The Display Controller provides 11 grid control outputs and 15 anode control outputs (only 14 anode control outputs are used). Each of these 26 high-voltage outputs provides an active driver to the +5V dc supply and a passive 220-kΩ (nominal) pull-down to the 30V dc supply.
Theory of Operation (2620A/2625A) Detailed Circuit Description 2 GRID/ANODE TIMING 5V 0V 1.14 ms GRID(X) -30V 116 µs 5V 0V ANODE(14..0) -30V 19 µs 60 µs 56 µs 98 µs 5V 0V GRID(X-1) -30V s10f.eps Figure 2-10. Grid-Anode Timing Relationships 2-71. Memory PCA (2625A Only) The Memory PCA is a serially-accessed, byte-wide, nonvolatile 256K-byte memory that is capable of storing up to 2047 scans of data.
HYDRA Service Manual the WE* signal is low, NAND gate output A6U2-3 goes high to latch the data bus into the lower part of the page register (A6U1).When register select PAGEH goes high and the WE* signal is low, NAND gate output A6U2-8 goes high to latch the lower three bits of the data bus into the high part of the page register (A6U4). 2-75. Byte Counter The Byte Counter is a seven-bit ripple counter that controls the lower address bits of the nonvolatile RAMs.
Chapter 2A Theory of Operation (2635A) Title Page 2A-1. Introduction ..........................................................................................2A-3 2A-2. Functional Block Description...............................................................2A-3 2A-3. Main PCA Circuitry.........................................................................2A-3 2A-4. Power Supply...............................................................................2A-3 2A-5. Digital Kernel .................
HYDRA Service Manual 2A-46. 2A-47. 2A-48. 2A-49. 2A-50. 2A-51. 2A-57. 2A-58. 2A-59. 2A-60. 2A-61. 2A-62. 2A-63. 2A-64. 2A-65. 2A-66. 2A-67. 2A-68. 2A-69. 2A-70. 2A-71. 2A-72. 2A-73. 2A-74. 2A-2 Totalizer Input .............................................................................2A-19 External Trigger Input Circuits....................................................2A-20 A/D Converter PCA .........................................................................2A-20 Analog Measurement Processor .
Theory of Operation (2635A) Introduction 2A 2A-1. Introduction The theory of operation begins with a general overview of the instrument and progresses to a detailed description of the circuits of each pca. The instrument is first described in general terms with a Functional Block Description. Then, each block is detailed further (often to the component level) with Detailed Circuit Descriptions. Refer to Section 8 of this manual for full schematic diagrams.
HYDRA Service Manual DIGITAL I/O AND TOTALIZE INPUT ALARM OUTPUTS SCAN TRIGGER INPUT AC IN RS-232 J4 DISPLAY J1 J6 J5 J3 J2 MAIN MEMORY CRAD INTERFACE P4 P2 P10 CHANNEL 0 CHANNELS 11…20 J10 TB1 TB2 ANALOG INPUT CONNECTOR P1 J1 A/D CONVERTER P2 J2 CHANNELS 1…10 S11F.EPS FIGURE 2A-1.
Theory of Operation (2635A) Functional Block Description 2A ANALOG INPUT CONNECTOR INPUT MULTIPLEXING INPUT PROTECTION INPUT SIGNAL CONDITIONING ANALOG MEASUREMENT PROCESSOR (A/D CONVERTER) MICRO CONTROLLER INGUARD A/D CONVERTER PCA SERIAL COMMUNICATION OUTGUARD GUARD CROSSING RS-232 µP FLASH MEMORY NVRAM & REAL-TIME CLOCK MEMORY CARD INTERFACE VACUUM FLUORESCENT DISPLAY ADDRESS DECODING DISPLAY CONTROLLER FPGA FRONT PANEL SWITCHES OPTION INTERFACE RESET CIRCUITS DIGITAL I/O DISPLAY
HYDRA Service Manual 2A-6. Serial Communication (Guard Crossing) This functional block provides a high isolation voltage communication path between the Digital Kernel of the Main PCA and the microcontroller on the A/D Converter PCA. This bidirectional communication circuit requires power supply voltages from the Power Supply block. 2A-7.
Theory of Operation (2635A) Detailed Circuit Description 2A 2A-14. Channel Selection Circuitry This circuitry consists of a set of relays and relay-control drivers. The relays form a tree that routes the input channels to the measurement circuitry. Two of the relays are also used to switch between 2-wire and 4-wire operation. 2A-15.
HYDRA Service Manual 2A-23. Power Supply Circuit Description The Hydra power supply consists of three major sections: • Raw DC Supply The raw dc supply converts line voltage (90V to 264V ac) to a dcoutput of 7.5V to 35V. • 5V Switcher Supply The 5V switching supply regulates the 7.5 to 35V dc input to anominal 5.0V ±0.25V dc (VCC). • Inverter Using the 5V switching supply output, the inverter generates the -30Vdc, -5V dc, and 5.
Theory of Operation (2635A) Detailed Circuit Description 2A The output voltage of the switcher supply is controlled by varying the duty cycle (ON time) of the switching transistor in the controller/switch device A1U9. A1U9 contains the supply reference, oscillator, switch transistor, pulse-width modulator comparator, switch drive circuit, current-limit comparator, current-limit reference, and thermal limit.
HYDRA Service Manual 2A-29. Inverter Inguard Supply The inverter inguard supply provides three outputs: +5.3V dc (VDD) and -5.4V dc (VSS) for the inguard analog and digital circuitry, and +5.6V dc (VDDR) for the relays. Diodes A1CR5 and A1CR6, and capacitor A1C12 are for the +9.5 volt source, and diodes A1CR7 and capacitor A1C13 are for the -9.5V source. Three-terminal regulator A1U6 regulates the 9.5V source to 5.6V for the relays. A1R5 and A1R6 set the output voltage at 5.6V.
Theory of Operation (2635A) Detailed Circuit Description 2A The Display Reset signal (DRST*) is driven low by A1U2-6 when POR* is low, or it may be driven low by the Microprocessor (A1U1-56) if the instrument firmware needs to reset only the display hardware. For example, the firmware resets the display hardware after the FPGA is loaded at power-up and the Display Clock (DCLK) signal from the FPGA begins normal operation. This ensures that the Display Processor is properly reset while DCLK is active.
HYDRA Service Manual The Microprocessor communicates to the Display Controller using a synchronous, threewire communication interface controlled by hardware in the Microprocessor. Information is communicated to the Display Controller to display user interface menus and measurement data. Details of this communication are described in the Display Controller Theory of Operation in this section.
Theory of Operation (2635A) Detailed Circuit Description 2A 2A-34. Address Decoding The four chip-select outputs on the Microprocessor are individual software programmed elements that allow the Microprocessor to select the base address, the size, and the number of wait states for the memory accessed by each output. The FLASH* signal (A1U1-128) enables accesses to 128 kilobytes of Flash Memory (A1U14 and A1U16).
HYDRA Service Manual 2A-35. Flash EPROM The Flash EPROM is an electrically erasable and programmable memory that provides storage of instructions for the Microprocessor and measurement calibration data. A switching power supply composed of A1U15, A1T3, A1CR21, and A1C66 through A1C69 generates a nominal +12 volt programming power supply (VPP) when the Microprocessor drives VPPEN high (A1U15-2).
Theory of Operation (2635A) Detailed Circuit Description 2A The SRAM* address decode output (A1U1-127) for the 128 kilobytes of NVRAM goes low for any memory access to A1U20 or A1U24. This signal must go through two NAND gates in A1U26 to the NVRAM chip select inputs (A1U20-22 and A1U24-22).
HYDRA Service Manual 2A-38. Display/Keyboard Interface The Microprocessor sends information to the Display Processor via a three-wire synchronous communication interface. The detailed description of the DISTX, DISRX, and DSCLK signals may be found in the detailed description of the Display PCA. Note that the DISRX signal is pulled down by resistor A1R1 so that Microprocessor inputs A1U1-49 and A1U1-118 are not floating at any time. The Display Clock (DCLK) is a 1.
Theory of Operation (2635A) Detailed Circuit Description 2A Clock Dividers The 12.288-MHz system clock (A1U25-30) is divided down by the Clock Dividers to create the 3.072-MHz Option Clock (OCLK; A1U25-22) and 1.024-MHz Display Clock (DCLK; A1U25-19). The Display Clock is not a square wave; it is low for 2/3 of a cycle and high for the other 1/3. The Display Clock is also used internal to the FPGA to create the 128-kHz Totalizer Debouncer Clock and the 4-kHz Keyboard Scanner Clock.
HYDRA Service Manual description of the External Trigger operation may be found in the "External Trigger Input Circuits" section. 2A-40. RS-232 Interface The RS-232 interface is composed of connector A1J4, RS-232 Driver/Receiver A1U13, and the serial communication hardware in Microprocessor A1U1. The serial communication transmit signal (A1U1-80) goes to the RS-232 driver (A1U1314), where it is inverted and level shifted so that the RS-232 transmit signal transitions between approximately +5.0 and -5.
Theory of Operation (2635A) Detailed Circuit Description 2A 2A-42. Digital I/O The following paragraphs describe the Digital Input Threshold, Digital Input Buffers, Digital and Alarm Output Drivers, Totalizer Input, and External Trigger Input circuits. 2A-43. Digital Input Threshold The Digital Input Threshold circuit sets the input threshold level for the Digital Input Buffers and the Totalizer Input.
HYDRA Service Manual The Totalizer Debounce circuit in the FPGA (A1U25) allows the Microprocessor to select totalizing of either the input signal or the debounced input signal. The buffered Totalizer Input signal (TOTI*) goes into the FPGA at A1U25-12. Inside the FPGA, the totalizer signal is routed to the Totalizer Output (TOTO, A1U25-8) which then goes to a 16-bit counter in the Microprocessor (A1U1-114; TP20). The actual debouncing of the input signal is accomplished by A1U25. Counters divide the 12.
Theory of Operation (2635A) Detailed Circuit Description • • • • 2A Passive filtering of dc voltage and resistance measurements Active filtering of ac voltage measurements A/D conversion Support for direct volts, true rms ac volts, temperature, resistance,and frequency measurements 2A-21
2A-22 LO SENSE LO SOURCE HI SENSE HI SOURCE REFERENCE JUNCTION R43 R11 R10 K16 C31 Figure 2A-3. Analog Simplified SchematicDiagram (2635A) K17 Z4 R34 R35 R32 TO U9 300V 300Ω 15 14 R42 30 VDC 300 VDC 30 KΩ 30V S16 7 6 5 OHMS VOLTAGE SOURCE TO REFERENCE RESISTOR 2 TO U9 28 29 30 31 32 33 S2 S3 TO OHMS SOURCE & RRS HI DIVIDER SWITCHING LOW 8 RMS 36 3.
Theory of Operation (2635A) Detailed Circuit Description 2A Table 2A-4. Analog Measurement Processor Pin Descriptions (2635A) Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Name VDD ACBO AIN AGND2 ACR4 ACR3 ACR2 ACR1 VSSA REFJ DCV LOW GRD RRS V4 V3 V1 GRD V2F V2 GRD V0 GRD OVS GRD AGND1 DGND FC0 FC1 FC2 FC3 FC4 FC5 FC6 FC7 XIN XOUT MRST AS AR SK CS BRS VSS INT SUM B.1 B.32 B1 B3.2 Description +5.
HYDRA Service Manual Table 2A-4.
Theory of Operation (2635A) Detailed Circuit Description • • • 2A The open thermocouple detect circuitry is protected against voltagetransient damage by A3Q14 and A3Q15. When measuring ac volts, the ac buffer is protected by dual-diodeclamp A3CR1 and resistor network A3Z3. Switching induced transients are also clamped by dual-diodeA3CR4 and capacitor A3C33, and limited by resistor A3R33. 2A-51.
HYDRA Service Manual For the 300V range (Figure 2A-4), the HI signal is again scaled by A3Z4. The input is applied to pin 1 of A3Z4, and a 1000:1 divider is formed by the 10-MΩ and 10.01-kΩ resistors when switches S3 and S9 are closed in A3Z4. The attenuated HI input is then sent through internal switch S10 to the passive filter and the a/d converter. LO is sensed through analog processor switch S18 and resistor A3R34. S2 A3R11 A3K17 INPUT HI A3R10 A3Z4 10M S3 S9 S10 A3Z4 10.
Theory of Operation (2635A) Detailed Circuit Description 2A OHMS VOLTAGE SOURCE IX LOW + VR REF – A/D INTEGRATE REFERENCE A3Z4 R REF REFERENCE RESISTOR A3R34 HIGH A3K16 A3RT1 & A3R10 A3R11 HI + VR X - A3R42 A3K17 PASSIVE FILTER RX UNKNOWN RESISTOR HIGH A/D INTEGRATE UNKNOWN LO LOW RX IX•RX VR X = = IX•RREF R REF VR REF s15f.eps Figure 2A-5.
HYDRA Service Manual A3U8 switch S2, and the LO SENSE path of A3R35 and Analog Processor switch S19. Passive filtering is provided by A3C34, A3C27, and portions or all of the DC Filter block. The voltage across the reference resistor for the 300Ω and RTD, 3-kΩ, and 30-kΩ ranges (the 1-kΩ, 10.01-kΩ, and 100.5-kΩ resistances in A3Z4, respectively) is integrated for a variable period of time until the voltage across the integrate capacitor reaches zero.
Theory of Operation (2635A) Detailed Circuit Description INPUT HI A3R11 A3Z3 1.111M A3K15 _ A3C31 A3U7 A3U6 RMS COVERTER + A3Z3 2.776k A3R44 A3Z3 FEEDBACK RESISTOR INPUT LO A3C15 & A3C16 2A A3Z3 115.7 A3R43 s16f.eps Figure 2A-6. AC Buffer Simplified Schematic (2635A) JFETs A3Q3 through A3Q9 select one of the four gain (or attenuation) ranges of the buffer (wide-bandwidth op-amp A3U7.) The four JFET drive signals ACR1 through ACR4 turn the JFETs on at 0V and off at -VAC.
HYDRA Service Manual The output of the buffer is ac-coupled by A3C15 and A3C16 to the true-rms ac-to-dc converter A3U6. Discharge JFET A3Q13 is switched on to remove any excess charge from the coupling capacitors A3C15 and A3C16 between channel measurements. A3C17 provides an averaging function for the converter, and resistor network A3Z1 divides the output by 2.5 before sending the signal to the active ac volts filter.
Theory of Operation (2635A) Detailed Circuit Description 2A + REFERENCE (– INPUT) + + COUNTER REFERENCE _ _ A3C13 A/D COMPARATOR S77 –REFERENCE (+ INPUT) INTEGRATE REFERENCE + A3Z2 _ _ INPUT HI BUFFER + INTEGRATOR INPUT LO INTEGRATE INPUT s17f.eps Figure 2A-7. A/D Converter Simplified Schematic (2635A) In both the slow and fast measurement rates, the a/d converter uses its ±300 mV range for most measurement functions and ranges.
HYDRA Service Manual 2A-59. Inguard Microcontroller Circuitry The Microcontroller, A3U9, with its internal program memory and RAM and associated circuitry, controls measurement functions on the A/D Converter PCA and communicates with the Main (outguard) processor. The Microcontroller communicates directly with the A3U8 Analog Measurement Processor using the CLK, CS, AR, and AS lines and can monitor the state of the analog processor using the FC[0:7] lines. Filter zeroing is controlled by the ZERO signal.
Theory of Operation (2635A) Detailed Circuit Description 2A-62. 2A Input Connector PCA The Input Connector assembly, which plugs into the A/D Converter PCA from the rear of the instrument, provides 20 pairs of channel terminals for connecting measurement sensors. This assembly also provides the reference junction temperature sensor circuitry used when making thermocouple measurements. Circuit connections between the Input Connector and A/D Converter PCAs are made via connectors A4P1 and A4P2.
HYDRA Service Manual 2A-65. Front Panel Switches The FPGA scans the 19 Front Panel Switches (A2S1 through A2S18, and A2S21) using only six interface signals (plus the ground connection already available from the power supply). These six signals (SWR1 through SWR6) are connected to bidirectional I/O pins on the FPGA. Each successive column has one less switch. This arrangement allows the unused interface signals to function as strobe signals when their respective column is driven by the FPGA.
Theory of Operation (2635A) Detailed Circuit Description 2A The second four-bit counter is controlled by an open-drain output on the Display Controller (A2U1-17) and pull-down resistor A2R1. When the beeper (A2LS1) is off, A2U1-17 is pulled to ground by A2R1. This signal is then inverted by A2U6, with A2U6-6 driving the CLR input high to hold the four-bit counter reset.
HYDRA Service Manual Once reset, the Display Controller performs a series of self-tests, initializing display memory and holding the DISRX signal high. After DISRX goes low, the Display Controller is ready for communication. On the first command byte from the Microprocessor, the Display Controller responds with a self-test results response. If all self-tests pass, a response of 00000001 (binary) is returned. If any self-test fails, a response of 01010101 (binary) is returned.
Theory of Operation (2635A) Detailed Circuit Description 2A GRID TIMING 16.56 ms 0V GRID(10) 1.37 ms 0V GRID(9) … … 1.37 ms 0V GRID(1) 1.37 ms 0V GRID(0) 1.37 ms 140 µs s19f.eps Figure 2A-9. Grid Control Signal Timing (2635A) GRID/ANODE TIMING 5V 0V 1.37 ms GRID(X) -30V 140 µs 5V 0V ANODE(14..0) -30V 22.5 µs 72 µs 67.5 µs 117 µs 5V 0V GRID(X-1) -30V s20f.eps Figure 2A-10. Grid-Anode Timing Relationships (2635A) 2A-70.
HYDRA Service Manual 2A-71. Main PCA Connector The Memory Card Interface PCA interfaces to the Main PCA through a 40-pin, right angle connector (A6P2). This connector routes eight bits of the Microprocessor data bus, the lower four bits of the address bus, memory control, interrupt and address decode signals from the Main PCA to the Memory Card Interface PCA. The Memory Card Interface PCA is powered by the +5.0V dc power supply (VCC).
Theory of Operation (2635A) Detailed Circuit Description 2A The Memory Card Controller provides a register based interface for the Microprocessor to use to access data stored on industry standard PCMCIA memory cards. A 26 bit counter controls the address bus (CA<0> through CA<25>) to the PCMCIA Memory Card Connector (A6P1). An eight bit data bus(CD<0> through CD<7>) and memory card control signals (REG*, CE1*, CRD*, and CWR*) control accesses to memory on the card.
HYDRA Service Manual ground pins are mated first followed by the reset of the input / output signals with the card detection signals mating last. This sequence is reversed on memory card removal. The PCMCIA Memory Card Connector has a metal shell that is connected to chassis ground to help ensure that the instrument meets EMI/EMC and ESD performance requirements. A push-button mechanism is included to allow easy ejection of the Memory Card.
static awareness A Message From Fluke Corporation Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices by: 1. Knowing that there is a problem. 2. Leaning the guidelines for handling them. 3. Using the procedures, packaging, and bench techniques that are recommended. The following practices should be followed to minimize damage to S.S. (static sensitive) devices. 1.
5. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT. 8. WHEN REMOVING PLUG-IN ASSEMBLIES HANDLE ONLY BY NON-CONDUCTIVE EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC-FREE WORK STATION. PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S.S. DEVICES. 6. DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE. 9. HANDLE S.S. DEVICES ONLY AT A STATIC-FREE WORK STATION. 10. ONLY ANTI-STATIC TYPE SOLDERSUCKERS SHOULD BE USED. 11. ONLY GROUNDED-TIP SOLDERING IRONS SHOULD BE USED. 7.
Chapter 3 General Maintenance Title 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 3-13. 3-14. 3-15. 3-16. 3-17. 3-18. 3-19. 3-20. 3-21. 3-22. 3-23. 3-24. 3-25. 3-26. 3-27. 3-28. 3-29. Introduction .......................................................................................... Warranty Repairs and Shipping ........................................................... General Maintenance............................................................................
HYDRA Service Manual 3-30. 3-31. 3-2 Install the Handle and Mounting Brackets....................................... 3-15 Install the Instrument Case...............................................................
General Maintenance Introduction 3 3-1. Introduction This section provides handling, cleaning, fuse replacement, disassembly, and assembly instructions. 3-2. Warranty Repairs and Shipping If your instrument is under warranty, see the warranty information at the front of this manual for instructions on returning the unit. The list of authorized service facilities is included in Section 6. 3-3. General Maintenance 3-4.
HYDRA Service Manual Most electronic components manufactured today can be degraded or destroyed by ESD. While protection networks are used in CMOS devices, they merely reduce, not eliminate component susceptibility to ESD. ESD may not cause an immediate failure in a component; a delayed failure or wounding effect is caused when the semiconductor’s insulation layers or junctions are punctured.
General Maintenance Line Fuse Replacement 3 3-9. Line Fuse Replacement The line fuse (125 mA, 250V, slow blow, Fluke Part Number 822254) is located on the rear panel. The fuse is in series with the power supply. For replacement, unplug the line cord and remove the fuse holder (with fuse) as shown in Figure 3-1. The instrument is shipped with a replacement fuse loosely secured in the fuse holder.
HYDRA Service Manual 3-11. Remove the Instrument Case Use the following procedure to remove the instrument case. 1. Make sure the instrument is powered off and disconnected from the power source (ac or dc). 2. Remove the screw from the bottom of the case, and remove the two screws from the rear bezel as shown in Figure 3-2. While holding the front panel, slide the case and rear bezel off the chassis. (At this point, the rear bezel is not secured to the case.) 3-12.
General Maintenance Disassembly Procedures 3 MOUNTING SCREW (2) GROUNDING SCREW CASE A. REAR BEZEL CHASSIS B. s22f.eps Figure 3-2.
HYDRA Service Manual COM VΩ 300V MAX A. B. C. s23f.eps Figure 3-3. Removing the Handle and Handle Mounting Brackets Note The Display PCA provides a space for a center securing screw. If the two tabs are intact, this screw is not necessary. If a tab is broken, a screw can be used as an additional securing device. The elastomeric Keypad Assembly (L) can now be lifted away from the Front Panel Assembly.
General Maintenance Disassembly Procedures D C 3 B A X W V T E K L G M H Y U I J Q Z N P O s24f.eps Figure 3-4.
HYDRA Service Manual D B C A X W V T E K L G M H Y U I J O Q P s25f.eps Figure 3-5.
General Maintenance Disassembly Procedures 3 3-15. Remove the IEEE-488 Option (2620A Only) Section 7 of this manual provides a detailed removal procedure for the IEEE-488 option. The following removal instructions provide the essentials of this procedure. Parts referenced by letter (e.g., A) are shown in Figure 3-4. If necessary, refer to the complete procedure in Section 7. 1. From the bottom of the instrument, locate the IEEE-488 PCA (N).
HYDRA Service Manual 3-18. Remove the Main PCA With the IEEE-488 option (2620A) and the Memory PCA (2625A) or Memory Card I/F PCA (2635A) removed, the Main PCA (H) can be removed. Parts referenced by letter (e.g., A) are shown in Figure 3-4 (2620A or 2625A) or Figure 3-5 (2635A). Use the following procedure: 1. If it is still attached, remove the green power switch activator rod (J) extending from the power switch on the Main PCA through the Front Panel Assembly.
General Maintenance Assembly Procedures 3 3-20. Disconnect Miscellaneous Chassis Components Use the following procedure to disconnect the remaining hardware from the chassis. Parts referenced by letter (e.g., A) are shown in Figure 3-4 (2620A or 2625A) or Figure 3-5 (2635A). 1. Use needle nose pliers to remove the internal connections at the line power plug (X). Remove the ground screw prior to disconnecting the ground wire from the plug. 2. Remove the power plug by releasing its two snaps one at a time.
HYDRA Service Manual 3-24. Install the Main PCA 1. Fit the Main PCA (H) so that the chassis guides pass through notches on both sides of the pca. Then slide the pca back until it is snug against the Rear Panel. 2. Replace the RS-232 connector screws (T) on the rear of the chassis. Use a 3/16-inch nut driver to tighten the connector hardware. 3. Fasten the Main PCA to the chassis with two 6-32, 1/4-inch panhead screws (U). 4. Connect the transformer cable at connector J3 on the Main PCA.
General Maintenance Assembly Procedures 3 3-27. Install the Memory Card I/F PCA (2635A Only) 1. Place the Memory Card I/F PCA (Q) into position so that the three mounting holes line up with the chassis supports located at the front-center of the chassis. 2. Install the three 6-32, 1/4-inch panhead Phillips screws in the mounting holes of the Memory Card I/F PCA. 3. Reconnect the high-density ribbon cable (O) to the connector on the Memory Card Interface PCA (Q). 3-28.
HYDRA Service Manual 3-16
Chapter 4 Performance Testing and Calibration Title 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 4-14. 4-15. 4-16. 4-17. 4-18. 4-19. 4-20. 4-21. 4-22. 4-23. 4-24. 4-25. 4-26. 4-28. 4-29. Page Introduction .......................................................................................... 4-3 Required Equipment............................................................................. 4-3 Performance Tests ..................................................................
HYDRA Service Manual 4-30. 4-31. 4-32. 4-33. 4-34. 4-2 Updating 2635A Data Bucket Embedded Instrument Firmware.......... Using the PC Compatible Firmware Loader Software .................... Setup Procedure for Firmware Download ................................... Default Instrument Firmware Download Procedure.................... Using LD2635 Firmware Loader Directly ..................................
Performance Testing and Calibration Introduction 4 4-1. Introduction This section of the Service Manual provides performance tests that can be used at any time to verify that Hydra (2620A, 2625A, or 2635A) operation is within published specifications. A complete calibration procedure is also included. The performance test and, if necessary, the calibration procedure can be performed periodically as well as after service or repair. 4-2.
HYDRA Service Manual 4-3. Performance Tests When received, the instrument is calibrated and in operating condition. The following performance verification procedures are provided for acceptance testing upon initial receipt or to verify correct operation at any time. All tests may be performed in sequence to verify overall operation, or the tests may be run independently. If the instrument fails any of these performance tests, calibration adjustment and/or repair is needed.
Performance Testing and Calibration Performance Tests 4 Table 4-2. Performance Tests (Voltage, Resistance, and Frequency) FUNCTION RANGE INPUT LEVEL short (0) 90 mV * 90 mV 90 mV * short (0V) 300 mV 150 mV 300 mV 290 mV 300 mV 900 mV 900 mV* ** 2.9V 3V -2.9V 3V 29V 30V 150V 150V 290V 300V * Range only used on 2635A (not used in autoranging). ** Computer I/F only (see FUNC command). DC Volts FREQUENCY DISPLAY ACCURACY (1 Year, 18-28°C) MIN MAX -0.007 89.962 -0.02 149.93 289.
HYDRA Service Manual Table 4-2. Performance Tests (Voltage, Resistance, and Frequency) (cont) FUNCTION RANGE INPUT LEVEL short 300Ω 100Ω short 3 kΩ 1 kΩ 3 kΩ 10 kΩ 30 kΩ 100 kΩ 300 kΩ 1 MΩ 3 MΩ 10 10 MΩ * Optional test point if standards available. FREQUENCY DISPLAY ACCURACY (1 Year, 18-28°C) MIN MAX 0.09 0.00 100.15 99.92 0.0003 0.0000 1.0009 0.9992 10.008 9.992 100.08 99.92 1.0008 0.9992 10.014 9.986 Note All channels (0 through 20) can accommodate 2-terminal resistance measurements.
Performance Testing and Calibration Performance Tests 4 1. Ensure that communication parameters (i.e., transmission mode, baud rate, parity, and echo mode) on Hydra and the host are properly configured to send and receive serial data. Refer to Section 4 of the Hydra Users Manual. 2. Power up Hydra, and wait 1/2 hour for its temperature to stabilize. 3. Connect a cable from the Output VA HI and LO connectors of the 5700A to the VΩ and COM connectors on the Hydra front panel. 4.
HYDRA Service Manual 4. Switch the instrument ON. 5. Select the 4-terminal OHMS function, AUTO range, for channel 1 on Hydra. 6. Set the 5700A to output the resistance values listed in Table 4-2 (Use decades of 1.9). 7. On Hydra press MON and ensure the display reads between the minimum and maximum values (inclusive) shown in Table 4-2. 8. The 4-terminal Resistance Test is complete.
Performance Testing and Calibration Performance Tests 4 2-WIRE (2T) CONNECTION SOURCE 11 12 13 14 15 16 17 18 19 20 HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL (4-WIRE) SENSE (4-WIRE) 1 2 3 4 5 6 7 8 9 10 RESISTANCE OR RTD SOURCE USE H AND L TERMINALS FOR ANY CHANNEL. • CHANNEL 0 ON FRONT PANEL • CHANNELS 1 THROUGH 20 ON REAR PANEL INPUT MODULE (CHANNEL 1 SHOWN HERE).
HYDRA Service Manual Note If other than a K type thermocouple is used, be sure that the instrument is set up for the type of thermocouple used. 3. Reconnect power and switch the instrument ON. 4. Insert the thermocouple and a mercury thermometer (.02 degrees Celsius resolution) in a room temperature bath. Allow 20 minutes for thermal stabilization. 5. Select the temperature function and K thermocouple type for channel 1. Then press MON. 6.
Performance Testing and Calibration Performance Tests 4-9. 4 Open Thermocouple Response Test Use the following procedure to test the open thermocouple response: 1. Switch OFF power to the instrument and disconnect all high voltage inputs. 2. Remove the Input Module from the rear of the instrument. Open the Input Module and connect test leads to the H (high) and L (low) terminals of channel 1. Reinstall the Input Module into the instrument. 3. Reconnect power and switch the instrument ON. 4.
HYDRA Service Manual 7. The RTD Temperature Accuracy test is complete. However, if you desire to perform this test on Input Module channels (2 through 10), repeat steps 1 through 5 substituting in the appropriate channel number. Note The only type of temperature measurement that can be made on channel 0 is 2-terminal RTD. Channels 11 through 20 support only 2-terminal RTDs. Table 4-5.
Performance Testing and Calibration Performance Tests 4 6. The RTD Temperature Accuracy test is complete. However, if you desire to perform this test on any other channel (0 or 2 through 20), repeat steps 1 through 5, substituting the appropriate channel number. Note The only type of temperature measurement that can be made on channel 0 is 2-terminal RTD. Channels 11 through 20 support only 2-terminal RTDs. Table 4-6.
HYDRA Service Manual Send the following commands to Hydra in sequence, and measure that the correct Digital Output line measures greater than +3.8V dc (HIGH state.) DO_LEVEL 0,1 Verify that output 0 measures a HIGH state. DO_LEVEL 1,1 Verify that output 1 measures a HIGH state. Repeat the command for all eight outputs. 4-15. Digital Input Test 1. Perform the DIGITAL OUTPUT TEST steps 1 through 5. 2.
Performance Testing and Calibration Performance Tests 4 computer). The host must send commands to Hydra to control the digital line for this test. 1. Ensure that communication parameters (i.e., transmission mode, baud rate, parity, and echo mode) on Hydra and the host are properly configured to send and receive serial data. Refer to Section 4 of the Hydra Users Manual. 2. Switch OFF power to the instrument and disconnect all high voltage inputs. 3.
HYDRA Service Manual 3. Verify that Hydra is still in the total measuring mode. If not, press the TOTAL button. Reset the totalizer count shown on the display by pressing the SHIFT and TOTAL(ZERO) buttons. The Hydra display should now show a value of 0. 4. Connect the output of the signal generator to the ∑ and J terminals. 5. Program the signal generator to output a 1.5V rms sine signal at 10 Hz. The Hydra display should now show the totalizing value incrementing at a 10 count per second rate. 4-18.
Performance Testing and Calibration Performance Tests ALARM OUTPUTS ALARM OUTPUT CONNECTOR ++ –– DIGITAL I/O 0 1 2 3 4 5 6 7 Σ 00 11 22 33 TR TR +30V 9-16 V DC PWR 0 1 2 ! 3 GND SOURCE INPUT MODULE 4 11 12 13 14 15 16 17 18 19 20 HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL HL (4-WIRE) SENSE (4-WIRE) 1 2 3 4 5 6 7 8 9 10 5700A HYDRA FRONT PANEL OUTPUT VΩA SENSE VΩ WIDEBAND HI HI LO LO REVIEW LAST COM VΩ HI 300V MAX FUNC Mx+B ALRM AUX GUARD GROUND CUR
HYDRA Service Manual 4-19. External Trigger Input Test The External Trigger Input Test verifies that the rear panel trigger input of Hydra is functioning properly. 1. Switch OFF power to the instrument and disconnect all high voltage inputs. 2. Remove the eight-terminal Alarm Output connector from the rear of Hydra and all external connections to it. Connect short wires (to be used as test leads) to the Gand TR terminals. Leave other ends of wires unconnected at this time. Reinstall the connector.
Performance Testing and Calibration Calibration 4 Activate calibration mode by pressing and holding the CAL Enable button (front panel) for approximately 4 seconds. Release the button after Hydra beeps and the CAL annunciator lights. Note The CAL Enable button is located on the right side of the display and is recessed beneath a calibration seal. Press this button with a blunt-tipped object. Avoid using a sharper-tipped object (such as a pencil).
HYDRA Service Manual To provide accuracy at full range, calibration is not recommended below one-third of full range (10000 counts). Table 4-8. Calibration Mode Computer Interface Commands Command Cal x Description Start calibration of a new function. x Function to calibrate 1 VDC 2 VAC 3 ohms 4 Frequency CAL_CLR Reset all calibration constants to nominal values, clearing present calibration. CAL_CONST? xx Return the value of the calibration constant indicated by xx.
Performance Testing and Calibration Calibration 4 3. From the CAL directory on the PC, type CAL. Then press any key to start the program and access the SETUP menu. 4. On Hydra, press POWER ON. After the initialization process has concluded, use the following procedure to set up communications: a. Press SHIFT and then LIST(COMM). b. With ’BAUd’ displayed, use the UP or DOWN arrow key to selectthe desired baud rate. Then press ENTER. c.
HYDRA Service Manual 4-24. Using a Terminal This procedure can be used with either a terminal or a computer running a terminal emulation program. 4-25. Setup Procedure Using a Terminal. Use the following procedure to set up Hydra and the PC: 1. Connect a pair of test leads to the high and low terminals of channel 1 on the Hydra Input Module. Connect a second pair of test leads to channel 11. 2. Install the Input Module into Hydra. 3.
Performance Testing and Calibration Calibration 4 Once the calibrator output has been set to Hydra, the CAL_STEP? query performs the calibration step and returns the calibrated value of the input. The response to CAL_STEP? must be received before each new step can begin. With some steps, a noticeable delay may be encountered. Table 4-9. DC Volts Calibration Command Response Action CAL 1 => Puts Hydra in VDC Calibration. CAL_REF? +90.000E-3 You output 90 mV dc from the 5700A. Wait about 10 seconds.
HYDRA Service Manual Note The 300 kΩ, 3 MΩ, and 10 MΩ ranges are sensitive to noise. Any movement of the input leads can cause noisy readings. Use shielded leads and verify these two calibration points at the conclusion of calibration. Table 4-10. AC Volts Calibration Command Response Action CAL 2 => Puts Hydra in VAC Calibration. CAL_REF? +029.00E-3 You output 29 mV ac at 1 kHz from the 5700A. Wait about 8 seconds.
Performance Testing and Calibration Calibration 4 4-WIRE (4T) CONNECTION SOURCE 11 12 13 14 15 16 17 18 19 20 HL HL HL HL HL HL HL HL HL HL (4-WIRE) SENSE HL HL HL HL HL HL HL HL HL HL HYDRA INPUT MODULE (4-WIRE) 1 2 3 4 5 6 7 8 9 10 DECADE RESISTANCE SOURCE s30f.eps Figure 4-5. 4-Terminal Connections to Decade Resistance Source 3.
HYDRA Service Manual SOURCE 11 12 13 14 15 16 17 18 19 20 HL HL HL HL HL HL HL HL HL HL (4-WIRE) SENSE HL HL HL HL HL HL HL HL HL HL HYDRA INPUT MODULE (4-WIRE) 1 2 3 4 5 6 7 8 9 10 5700A OUTPUT V ΩA SENSE VΩ WIDEBAND HI HI LO LO HI AUX CURRENT GUARD GROUND NC NC EX SNS : ON EX GRD : OFF 2-WIRE COMP OFF SENSE SOURCE HYDRA 5700A SOURCE SENSE s31f.eps Figure 4-6.
Performance Testing and Calibration Updating 2635A Data Bucket Embedded Instrument Firmware 4 Table 4-11. 4-Wire Ohms Calibration (Fixed Resistor) Command Response Action CAL 3 => Puts Hydra in OHMS Calibration. CAL_REF? +290.00E+0 You source 290Ω from the decade resistance source or fixed resistor. CAL_STEP? Hydra computes calibration constant 15 and returns the calibrated reading. (For software versions lower than 5.4, this step computes calibration constant 13.
HYDRA Service Manual Table 4-12. 4-Wire Ohms Calibration (5700A) Command CAL 3 Action Puts Hydra in OHMS Calibration Note With the following CAL_REF commands, send the actual resistance value (e.g., xxx.xxxxx) displayed by the 5700A. Source 190Ω from the 5700A. Then wait 4 seconds for the 5700A to settle. CAL_REF xxx.xxxxx CAL_STEP? Hydra computes calibration constant 15 and returns the calibrated reading. (For software versions lower than 5.4, this step computes calibration constant 13.
Performance Testing and Calibration Updating 2635A Data Bucket Embedded Instrument Firmware 4 Firmware downloading may be accomplished by using either of the two methods that are described in the following paragraphs. • • Default Instrument Firmware Download Procedure Using LD2635 Firmware Loader Directly Table 4-13. Frequency Calibration Command Response Action CAL 4 => Put Hydra in Frequency Cal. CAL_REF? +10.000E+3 Output 2.9 volts ac at 10 kHz from the 5700A. Wait about 8 seconds.
HYDRA Service Manual 1. If it is important to retain the channel programming information in the instrument, store a copy of the instrument configuration setup on a memory card. Refer to section on "Using SETUP STORE" in section 3 of the 2635A Data Bucket Users Manual. 2. To load the instrument firmware, run ’LOADC1.BAT’ if COM port #1 is to being used. Otherwise, run ’LOADC2.BAT’ if COM port #2 is to being used.
Chapter 5 Diagnostic Testing and Troubleshooting (2620A/2625A) Title 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 5-7. 5-8. 5-9. 5-10. 5-11. 5-12. 5-13. 5-14. 5-15. 5-16. 5-17. 5-18. 5-19. 5-20. 5-21. 5-22. 5-23. 5-24. 5-25. 5-26. 5-27. Introduction .......................................................................................... Servicing Surface-Mount Assemblies .................................................. Error Codes......................................................................................
HYDRA Service Manual 5-28. 5-29. 5-2 Failure to Detect Memory PCA................................................... 5-29 Failure to Store Data....................................................................
Diagnostic Testing and Troubleshooting (2620A/2625A) Introduction 5 5-1. Introduction Hydra provides error code information and semi-modular design to aid in troubleshooting. This section explains the error codes and describes procedures needed to isolate a problem to a specific functional area. Finally, troubleshooting hints for each functional area are presented. But first, if the instrument fails, check the line voltage fuse and replace as needed.
HYDRA Service Manual • A good connection with SMT requires only enough solder to make apositive metallic contact. Too much solder causes bridging, while toolittle solder can cause weak or open solder joints. With SMT, theanchoring effect of the through-holes is missing; solder provides theonly means of mechanical fastening. Therefore, the pca must beespecially clean to ensure a strong connection. An oxidized pca padcauses the solder to wick up the component lead, leaving littlesolder on the pad itself.
Diagnostic Testing and Troubleshooting (2620A/2625A) Error Codes 5 Table 5-1.
HYDRA Service Manual Table 5-1. Error Codes (cont) Error Description Error b A/D RAM test failure Complementary patterns are alternately written to and read from each location of the 256 bytes of RAM internal to the 6301Y Microcomputer (A3U9). Error C A/D self test failed The Analog Measurement Processor (A3U8) is programmed to do self test measurements. 5-4. General Troubleshooting Procedures Hydra allows for some fault isolation using self-diagnostic routines and descriptive error codes.
Diagnostic Testing and Troubleshooting (2620A/2625A) Power Supply Troubleshooting A1TP16 A1TP8 A1TP4 A1TP17 A1TP15 A1TP6 A1TP11 A1TP5 Option Interface 5 A1TP31 Display Connector A1TP30 A1TP32 A1TP1 A1TP3 A1TP31 A1TP10 A1TP13 A1TP12 A1TP14 A1TP18 RS-232 Connector A1TP19 A1TP9 A1TP2 Digital Input 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61 NMI STBY RES MP1 MP0 EXTAL XTAL Vss NC E P70 RD* P71 WR* P72 R/W* P73 LIR* P74 P30 D0 P31 D1 A1TP20 A1TP7 10 11 12 13 14 15 16 17 18 19 20 21 22 23
HYDRA Service Manual 5-5. Power Supply Troubleshooting Warning To avoid electric shock, disconnect all channelinputs from the instrument before performing anytroubleshooting operations. 5-6. Raw DC Supply With the instrument connected to line power (120V ac, 60 Hz) and turned ON, check for approximately 14V dc between A1TP1 (GND) and the "+" terminal of capacitor A1C7 (or the cathode of either A1CR2 or A1CR3). (This voltage is approximately 30V dc at 240V ac line.
Diagnostic Testing and Troubleshooting (2620A/2625A) Power Supply Troubleshooting 5 U9-7 and T2-2 20V 0V 5V/DIV 2 µS/DIV Normal Load s33f.eps Figure 5-2. 5-Volt Switching Supply If no square wave is present at A1U9-7, the oscillator can be checked by looking at the signal at A1U9-3. The oscilloscope should be ac-coupled for this measurement. This waveform should be a sawtooth signal with an amplitude of 0.6V p-p and a period of approximately 14 us.
HYDRA Service Manual For the inverter to operate, the 110-kHz oscillator must be operating properly. If the signal at A1U22-3 is missing, begin by checking the voltage at A1TP7. The voltage should be about 5.1V dc. Then, using an oscilloscope, check for a square wave signal at A1U23-9 and a square wave signal at A1U23-8.
Diagnostic Testing and Troubleshooting (2620A/2625A) Power Supply Troubleshooting 5 TP9 AND TP10 0 2V/DIV 2µS/DIV FET GATE SIGNAL Q7, Q8, OR T1-1 OR -3 0 2V/DIV 2µS/DIV FET DRAIN SIGNAL s34f.eps Figure 5-3.
HYDRA Service Manual 5-10. Analog Troubleshooting Warning To avoid electric shock, disconnect all channelinputs from the instrument before performing anytroubleshooting operations. Refer to Figure 5-4 and Figure 5-5 for test point locations on the A/D Converter PCA. First, check for analog-related errors displayed at power up. An ’Error 9’ means that the Main Microprocessor A1U4 is not able to communicate with the A/D Microcontroller A3U9.
Diagnostic Testing and Troubleshooting (2620A/2625A) Analog Troubleshooting 5 Table 5-3. Power Supply Troubleshooting Guide Symptom Fault Line fuse blows. - Shorted A1CR2 or A1CR3. - Shorted A1CR10. - Shorted A1C7. - Shorted A1C26. Supply voltage for A1U23 and A1U22 is greater than 7V (7 to 30V). Input-to-output short of A1U19. This fault may have caused damage to A1Q7 and A1Q8. VCC (5.1V) supply is at the raw supply level (7.5 to 35V dc). Shorted switch transistor in A1U9 (A1U9-5 to 7).
HYDRA Service Manual Table 5-3. Power Supply Troubleshooting Guide (cont) Symptom Fault A1U18 hot. Shorted A1C32 A1U18 oscillates. Open A1C32. A1U19 oscillates. Open A1C34. A1U19 very hot. - Shorted A1U22 (VCC to VSS). - Shorted A1U23 (VCC to VSS). A1U19 hot. Shorted A1C34. Check that the inguard Microcontroller A3U9 RESET* line is de-asserted. Check VDD at A3TP1, referenced to A3TP9. Check that the microcontroller crystal oscillator is running.
Diagnostic Testing and Troubleshooting (2620A/2625A) Analog Troubleshooting 5 A3TP2 A3TP8 A3TP7 A3TP1 RMS Converter Network A3TP13 A3TP3 A3TP4 A/D Microcontroller A3TP5 A3TP6 A3TP10 A3TP11 RMS Converter A3TP12 A3TP9 AC Buffer Analog Measurement Processor VSSAC ACR1 ACR2 ACR3 ACR4 AGND2 AIN ACB0 VDD RMSI RMSG1 VSSRMS BIAS2 RMS0 RMSC2 ARTN RMSF 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61 Divider Network (DC/OHMS) 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 10 11 12 13 14 15 16 17 18 19 20
HYDRA Service Manual A3TP2 A3TP8 A3TP7 A3TP4 A3TP1 RMS Converter Network A3TP3 A/D Microcontroller A3TP5 A3TP13 A3TP6 A3TP10 A3TP11 RMS Converter A3TP12 A3TP9 AC Buffer Analog Measurement Processor Zener Reference ZERO K3S K3R K7S K7R K14S K14R VDD RESET VDD VDD Intergrate Resistors, Reference Divider Divider Network (DC/OHMS) P20 P21 P22 P23/RX P24/TX P25 P26 P27 NC P50/IRQ1* P51/IRQ2* P52 P53 P54 P55 P56 P57 P32 P33 P34 P35 P36 P37 NC P10 P11 P12 P13 P14 P15 P16 P17 VSS P40 60 59 58
Diagnostic Testing and Troubleshooting (2620A/2625A) Analog Troubleshooting 5 A3TP13 TO A3TP9 0 1V/DIV 5 mS/DIV s37f.eps Figure 5-6. Integrator Output 5-11. DC Volts Troubleshooting Setup the instrument to measure a specific channel on the 300 mV or 3V range, and apply an input to that channel. Then trace the HI signal (referenced to the input channel LO terminal) as described in Table 5-4.
HYDRA Service Manual Table 5-5. AC Volts HI Troubleshooting Checkpoint Signal Description Possible Fault A3R11 HI Input A3K1 through A3K14, A3U4, A3U5, A3U11, A3U12 A3L1, A3L2, A3L3 A3Z3 pin 1 Input A3R11, A3C31, A3K15 A3U6 pin 13 Amplified (X 2.
Diagnostic Testing and Troubleshooting (2620A/2625A) Digital Kernel Troubleshooting 5 5-14. Digital Kernel Troubleshooting At power-up, if the display does not light or lights up and fails to report errors or begin operation, use the following troubleshooting procedures. First check the state of SWR1 (A1U4-21). If this status line is less than 0.8V, basic processor operation is intact.
HYDRA Service Manual Figure 5-7 shows the timing relationships of the 6303Y Microprocessor lines LIR* and WR* to the system clock (E) and the address lines A0..A15. The ROM and NVRAM Chip Enables correspond to the active (low) region shown for the address lines. If the instrument powers up without any errors, but does not recognize front-panel button presses or computer interface commands, the problem may be in the Counter/Timer (A1U2).
Diagnostic Testing and Troubleshooting (2620A/2625A) Digital and Alarm Output Troubleshooting 5 5-15. Digital and Alarm Output Troubleshooting Power up Hydra while holding down the CANCL button to reset the instrument configuration. Since the structure of the eight Digital Outputs and four Alarm Outputs is very similar, the troubleshooting procedure presented here does not refer to specific device and pin numbers.
HYDRA Service Manual A2TP2 A2TP3 A2TP6 A2TP1 1 2 A2TP5 A2TP4 (S21) (S1) (S3) (S5) (S7) (S9) (S11) (S13) (S15) (S17) (S2) (S4) (S6) (S8) (S10) (S12) (S14) (S16) (S18) A2TP2 A2TP3 A2TP6 A2TP1 + A2TP5 LS1 U1 A2TP4 J1 TEST POINT LOCATIONS (DISPLAY PCA) s39f.eps Figure 5-8.
Diagnostic Testing and Troubleshooting (2620A/2625A) Display Assembly Troubleshooting 5 5-18. Display Assembly Troubleshooting The following discussion is helpful if it has been determined that the Display Assembly is faulty. Refer to Figure 5-8 for Display PCA test points. This initial determination may not be arrived at easily, since an improperly operating display may be the result of a hardware or software problem that is not a direct functional part of the Display Assembly.
HYDRA Service Manual REM SCAN REVIEW SET FUNC mV x1 k Ω 1 EXT TR s41f.eps Figure 5-10. Display Test Pattern #1 LAST MAX MIN F AUTO MON Mx+B ALARM °C °F RO AC DC Hz M LIMIT HI OFF PRN CH 2 LO CAL s42f.eps Figure 5-11. Display Test Pattern #2 When a Hydra display is initially powered up, all display segments should come on automatically.
Diagnostic Testing and Troubleshooting (2620A/2625A) Variations in the Display 5 5. Verify that the DISRX signal (A2U1-39) goes low after RESET (A2U1-1) goes low. If this sequence does not occur, communication to the Microprocessor is held off with the DISRX signal high. If DISRX stays high but is not shorted to VCC, A2U1 must be faulty. 6. Verify activity for both the DISTX and DSCLK signals.
HYDRA Service Manual 5-20. Calibration Failures 5-21. Introduction Calibration of Hydra through the computer interface is described in Section 4 of this manual. Generally, a calibration failure is indicated by a Device Dependent Error and a "!>" prompt after a CAL_STEP? command if the RS-232 interface is being used. If the IEEE-488 interface is being used, the Device Dependent Error may be detected by reading the Event Status Register (see the Hydra User Manual).
Diagnostic Testing and Troubleshooting (2620A/2625A) Calibration Failures 5 Note During calibration, the measurement rateis selected automatically as required by thecalibration step. Table 5-9 or Table 5-10 may be useful in isolating a calibration problem to specific components. Table 5-9 can be used with a Hydra having a main software version number of 5.4 or higher. Table 5-10 can be used with main software versions lower than 5.4. Note that the software version number is not marked on the Hydra case.
HYDRA Service Manual 5-23. Retrieving Calibration Constants If a calibration error is suspected, the stored constant can be retrieved and verified over the computer interface. Acceptable calibration constants for each function and range are listed in Table 5-9 (software version 5.4 and higher) or 5-10 (software versions lower than 5.4.) Retrieve the constant with the following command: CAL_CONST? xx (where xx denotes the calibration constant number) Table 5-10.
Diagnostic Testing and Troubleshooting (2620A/2625A) IEEE-488 Interface PCA (A5) Troubleshooting 5 The following command may be used to program the serial number into the EEPROM: SERIAL XXXXXXX (xxxxxxx denotes the 7-digit number. Leading zeros The serial number of the instrument can be accessed by using the "SERIAL?" command. The response will be "0" (if the serial number has not yet been set) or the 7-digit serial number. 5-25.
HYDRA Service Manual While the instrument is scanning, check that data is being stored correctly. Use an oscilloscope to monitor activity on the 7 outputs of the Byte Counter (A6U3) and the 11 outputs of the Page Register (A6U1 and A6U4). Since the repetition rate is fairly low, it may be necessary to use a storage oscilloscope to capture the activity. If either of these circuit elements is not functioning, check the Address Decode circuit (A6U2, A6U5, A6U8) for activity at the end of every scan.
Chapter 5A Diagnostic Testing and Troubleshooting (2635A) Title 5A-1. 5A-2. 5A-3. 5A-4. 5A-5. 5A-6. 5A-7. 5A-8. 5A-9. 5A-10. 5A-11. 5A-12. 5A-13. 5A-14. 5A-15. 5A-16. 5A-17. 5A-18. 5A-19. 5A-20. 5A-21. 5A-22. 5A-23. 5A-24. 5A-25. 5A-26. 5A-27. Introduction .......................................................................................... Servicing Surface-Mount Assemblies .................................................. Error Codes................................................................
HYDRA Service Manual 5A-28. 5A-29. 5A-30. 5A-31. 5A-32. 5A-2 Failure to Detect Insertion of Memory Card ............................... Failure to Power Card / Illuminate the Busy Led ........................ Failure to Illuminate the Battery Led .......................................... Failure to Write to Memory Card ................................................ Write/Read Memory Card Test (Destructive) .............................
Diagnostic Testing and Troubleshooting (2635A) Introduction 5A-1. 5A Introduction Hydra provides error code information and semi-modular design to aid in troubleshooting. This section explains the error codes and describes procedures needed to isolate a problem to a specific functional area. Finally, troubleshooting hints for each functional area are presented. But first, if the instrument fails, check the line voltage fuse and replace as needed.
HYDRA Service Manual • Surface-mount assemblies require rework with wire solder rather thanwith solder paste. A 0.025-inch diameter wire solder composed of 63%tin and 37% lead is recommended. A 60/40 solder is also acceptable. • A good connection with SMT requires only enough solder to make apositive metallic contact. Too much solder causes bridging, while toolittle solder can cause weak or open solder joints.
Diagnostic Testing and Troubleshooting (2635A) Error Codes 5A Table 5A-1.
HYDRA Service Manual Table 5A-1. Error Codes (2635A) (cont) Error Error 9 Description A/D Converter Not Responding This error is displayed if communication cannot be established with the 6301Y Microcomputer (A3U9). Error A A/D Converter ROM Test Failure (A3U9) All bytes of internal ROM for the 6301Y Microcomputer (A3U9) (including the checksum byte) are summed.
Diagnostic Testing and Troubleshooting (2635A) General Troubleshooting Procedures A1TP30 A1TP4 A1TP31 A1TP5 A1TP10 A1TP32 A1TP6 A1TP18 A1TP11 A1TP3 A1TP20 A1TP7 A1TP2 A1TP14 A1TP9 A1TP12 A15 A14 A13 A12 GND A11 A10 A9 A8 A7 A6 A5 A4 GND A3 A2 A1 FC0 VDD FC1 FC2 CS0 CS1 GND CS2 CS3 RMC IAC PB11 PB10 PB9 PB8 WDOG A1TP15 A1TP1 A1TP13 VDD A16 A17 A18 A19 GND A20 A21 A22 A23 VDD GND D15 D14 D13 D12 GND D11 D10 D9 D8 VDD D7 D6 D5 D4 GND D3 D2 D1 D0 CTS3 CD1 17 10 5 1 125 117 110 25 105
HYDRA Service Manual Refer to the Schematic Diagrams in Section 8 during the following troubleshooting instructions. Also, these diagrams are useful in troubleshooting circuits not specifically covered here. 5A-5. Power Supply Troubleshooting Warning To avoid electric shock, disconnect all channel inputs from the instrument before performing any troubleshooting operations. 5A-6.
Diagnostic Testing and Troubleshooting (2635A) Power Supply Troubleshooting 5A-9. 5A Inverter Use an oscilloscope to troubleshoot the inverter supply. The outputs of the inverter supply are -5V dc (VEE), -30V dc (VLOAD), and 5.4V ac (FIL1 and FIL2) outguard, and +5.3V dc (VDD), -5.4V dc (VSS), and +5.6V dc (VDDR) inguard. Refer to Figure 5A-3. The signal at the drains of the two inverter switch FETs (A1Q7 and A1Q8) should be a 10V peak square wave with a period of approximately 18 us.
HYDRA Service Manual TP9 AND TP10 0 2V/DIV 2µS/DIV FET GATE SIGNAL Q7, Q8, OR T1-1 OR -3 0 2V/DIV 2µS/DIV FET DRAIN SIGNAL s45f.eps Figure 5A-3.
Diagnostic Testing and Troubleshooting (2635A) Analog Troubleshooting 5A Note When making voltage measurements in the invertercircuit, remember that there are two separategrounds. The outguard ground is the ’GND’ testpoint (A1TP1), and the inguard ground is the’COM’ test point (A1TP30). The inguard regulator circuits for VDD and VSS have current limits. Shorts and heavy loads between VDD and COM, VSS and COM, and VDD and VSS will cause one or both supplies to go into current limit.
HYDRA Service Manual Table 5A-3. Power Supply Troubleshooting Guide (2635A) Symptom 5A-12 Fault Line fuse blows. - Shorted A1CR2 or A1CR3. - Shorted A1CR10. - Shorted A1C7. - Shorted A1C26. Supply voltage for A1U23 and A1U22 is greater than 7V (7 to 30V). Input-to-output short of A1U19. This fault may have caused damage to A1Q7 and A1Q8. VCC (5.1V) supply is at the raw supply level (7.5 to 35V dc). Shorted switch transistor in A1U9 (A1U9-5 to 7). Open A1C26 can cause switch transistor to short.
Diagnostic Testing and Troubleshooting (2635A) Analog Troubleshooting 5A Table 5A-3. Power Supply Troubleshooting Guide (2635A) (cont) Symptom Fault A1U18 hot. Shorted A1C32 A1U18 oscillates. Open A1C32. A1U19 oscillates. Open A1C34. A1U19 very hot. - Shorted A1U22 (VCC to VSS). - Shorted A1U23 (VCC to VSS). A1U19 hot. Shorted A1C34. Check the inguard supply voltages on the A/D Converter PCA with respect to A3TP9. The following table lists the components nearest the power supply test points.
HYDRA Service Manual A3TP2 A3TP8 A3TP7 A3TP4 A3TP1 RMS Converter Network A3TP3 A/D Microcontroller A3TP5 A3TP13 A3TP6 A3TP10 A3TP11 RMS Converter A3TP12 A3TP9 AC Buffer Analog Measurement Processor Zener Reference ZERO K3S K3R K7S K7R K14S K14R VDD RESET VDD VDD Intergrate Resistors, Reference Divider Divider Network (DC/OHMS) P20 P21 P22 P23/RX P24/TX P25 P26 P27 NC P50/IRQ1* P51/IRQ2* P52 P53 P54 P55 P56 P57 P32 P33 P34 P35 P36 P37 NC P10 P11 P12 P13 P14 P15 P16 P17 VSS P40 60 59 58
Diagnostic Testing and Troubleshooting (2635A) Analog Troubleshooting 5A A3TP2 A3TP8 A3TP7 A3TP1 RMS Converter Network A3TP13 A3TP3 A3TP4 A/D Microcontroller A3TP5 A3TP6 A3TP10 A3TP11 RMS Converter A3TP12 A3TP9 AC Buffer Analog Measurement Processor VSSAC ACR1 ACR2 ACR3 ACR4 AGND2 AIN ACB0 VDD RMSI RMSG1 VSSRMS BIAS2 RMS0 RMSC2 ARTN RMSF 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61 Divider Network (DC/OHMS) 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 10 11 12 13 14 15 16 17 18 19 20 21 22
HYDRA Service Manual Lack of outguard-to-inguard communication activity may be due to improper operation of circuit elements other than A3U9. Using a high input impedance oscilloscope or timer/counter, check for proper Analog Processor (A3U8) crystal oscillator operation. A 3.84-MHz sine wave (260 ns period) should be present at A3U8 pin 37 with respect to A3TP9. Check the A/D Converter voltage reference: A3TP12 to A3TP11 (across A3C12) = +1.05V (+0.10V, -0.
Diagnostic Testing and Troubleshooting (2635A) Analog Troubleshooting 5A Table 5A-4. DC Volts HI Troubleshooting (2635A) Checkpoint Signal Description Possible Fault A3R11 HI Input A3K1 through A3K14, A3U4, A3U5, A3U11, A3U12, A3L1, A3L2, A3L3 A3U8 pin 23 Input A3R11, A3K17, A3R42, A3C32 A3U8 pin 58 Input, DC filter output A3U8, A3Q2 5A-12. AC Volts Troubleshooting Setup the instrument to measure a channel on the 300 mV ac range, and apply a signal to that channel.
HYDRA Service Manual Table 5A-6. Ohms Open-Circuit Voltage (2635A) Range Voltage 3V 1.3V 1.3V 3V 3V 3V 300Ω 3 kΩ 30 kΩ 300 kΩ 3 MΩ 10 MΩ Table 5A-7.
Diagnostic Testing and Troubleshooting (2635A) Digital Kernel Troubleshooting 5A During instrument power-up, the RESET* and HALT* signals are held low for 140 to 280 milliseconds after the VCC power supply is greater than 4.65 volts dc. Before the Microprocessor can begin execution of the firmware stored in the Flash Memory, the reset circuit must release the RESET* and HALT* signals (A1U2-11 and A1U2-8 respectively) and allow them to go high.
HYDRA Service Manual If the instrument powers up and displays ’boot,’ it is likely that one of the memory test errors (Errors 1 through 3) was detected. To determine what the error status was, connect a terminal or computer to the RS-232 interface (19200 baud, 8 data bits, no parity). Assuming that the RS-232 interface is functional, send a carriage return or line feed character to the instrument, and it should send back a prompt that shows a number followed by a ’>’ character.
Diagnostic Testing and Troubleshooting (2635A) Digital and Alarm Output Troubleshooting 5A Figure 5A-7 shows the timing relationships of the MC68302 Microprocessor address, data, and memory control signals used for memory read and write cycles. The chip selects from the Microprocessor (FLASH*, SRAM*, XMCARD*, and I/O*) are decoded internally from the address bus and the address strobe (AS*) signal.
HYDRA Service Manual S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 W W W W S5 S6 S7 CLK A1 – A23 AS UDS LDS R/W DTACK D8 – D15 D0 – D7 READ WRITE SLOW READ READ AND WRITE CYCLE TIMING DIAGRAM S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 CLK A1 – A23 A0* AS UDS LDS R/W DTACK D8 – D15 D0 – D7 WORD READ ODD BYTE READ EVEN BYTE READ *INTERNAL SIGNAL ONLY WORD AND BYTE READ CYCLE TIMING DIAGRAM S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5
Diagnostic Testing and Troubleshooting (2635A) Totalizer Troubleshooting 5A If the Input Buffer does not function correctly, the problem is probably A1Z1, A1Z3, or the associated comparator (A1U3 or A1U4). If the Input Buffer functions correctly, but Hydra is not able to read the state of the Digital Input correctly, the problem is most likely the FPGA (A1U25).
HYDRA Service Manual A2TP2 A2TP3 A2TP6 A2TP1 1 2 A2TP5 A2TP4 (S21) (S1) (S3) (S5) (S7) (S9) (S11) (S13) (S15) (S17) (S2) (S4) (S6) (S8) (S10) (S12) (S14) (S16) (S18) A2TP2 A2TP3 A2TP6 A2TP1 + A2TP5 LS1 U1 A2TP4 J1 TEST POINT LOCATIONS (DISPLAY PCA) s50f.eps Figure 5A-8.
Diagnostic Testing and Troubleshooting (2635A) Display Assembly Troubleshooting. 5A Table 5A-8. Display Initialization (2635A) A2TP4 DTEST* A2TP5 LTE* 1 1 0 0 1 0 1 0 POWER-UP DISPLAY INITIALIZATION All Segments OFF All Segments ON (default) Display Test Pattern #1 Display Test Pattern #2 DSCLK DISTX BIT 7 DISRX BIT 7 BIT 6 BIT 6 BIT 5 BIT 5 BIT 4 BIT 4 BIT 3 BIT 3 BIT 2 BIT 2 BIT 1 BIT 1 CLEAR TO RECEIVE BIT 0 BIT 0 CLEAR TO RECEIVE HOLD OFF 31.5 µs 31.5 µs s54f.eps Figure 5A-9.
HYDRA Service Manual 2. Check the filament drive signals FIL1 and FIL2; these connect to the last two pins on each end of A2DS1. These signals should be 5.4V ac with FIL2 biased to be about 6.8V dc higher than the VLOAD supply (nominally a -23.2V dc level). FIL1 and FIL2 should be 180 degrees out of phase. If the dc bias of FIL2 is not at about 23.2V dc, the display segments that should be "off" will show a shadowing (or speckling) effect. 3. Check the clock signal CLK1 at A2TP2, A2U1-2, and A2U4-3.
Diagnostic Testing and Troubleshooting (2635A) Calibration Failures 5A 2. Wait a moment for the instrument to beep, then release SHIFT. The entire display will now stay on until you are ready to deactivate it. 3. At the end of the activation period, press any button on the front panel; the instrument resumes the mode in effect prior to the power interruption (Active or Inactive.) 5A-20. Calibration Failures 5A-21.
HYDRA Service Manual Basic dc measurements depend on the zener reference (A3VR1), reference divider network (A3Z2), and integrate resistors (A3Z2). Resistance measurements and dc measurements above three volts additionally depend on the resistors in the dc divider network (A3Z4). AC measurements depend on the ac divider network (A3Z3), ac buffer (A3U7), and RMS converter (A3U6), as well as the basic dc measurement components.
Diagnostic Testing and Troubleshooting (2635A) Calibration Failures 5A-23. 5A Retrieving Calibration Constants If a calibration error is suspected, the stored constant can be retrieved and verified over the computer interface. Acceptable calibration constants for each function and range are listed in Table 5A-9.
HYDRA Service Manual The following command may be used to program the serial number into the FLASH Memory: SERIAL XXXXXXX (xxxxxxx denotes the 7-digit number. Leading zeros must be entered. Note: once entered, the number cannot be changed.) The serial number of the instrument can be accessed by using the “SERIAL?” command. The response will be “0” )if the serial number has not yet been set) or the 7-digit serial number. 5A-25. Memory Card I/F PCA (A6) Troubleshooting. 5A-26.
Diagnostic Testing and Troubleshooting (2635A) Memory Card I/F PCA (A6) Troubleshooting. 5A-28. 5A Failure to Detect Insertion of Memory Card When a Memory Card is inserted into the Memory Card Interface, the card detect signals (CD1 and CD2; A6U1-19 and A6U1-21) are driven low. Verify that the Memory Card Controller detects this and interrupts the Microprocessor (A1U1) by driving the MCINT* signal (A6U1-60) low. Failure to generate the interrupt may be due to problems with the data bus (D8..
HYDRA Service Manual 5A-31. Failure to Write to Memory Card The installed memory card controls the state of the write protect (WP) signal that is an input to the Memory Card Controller (A6U1-22). This signal must be near 0 volts dc when the memory card is powered up and any operation requiring write access to the memory card is done.
Diagnostic Testing and Troubleshooting (2635A) Memory Card I/F PCA (A6) Troubleshooting. • With ’CtS’ (Clear to Send) displayed, use the UP or DOWN arrow key to select ’OFF’. Then press ENTER. • With ’ECHO’ displayed, use the UP or DOWN arrow key to select ’ON’. Then press ENTER. Communications setup for Hydra is now complete. 5A Assuming that the RS-232 interface is functional, send a carriage return or line feed character to the instrument and it should send back a prompt.
HYDRA Service Manual 5A-34
Chapter 6 List of Replaceable Parts Title 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. Page Introduction .......................................................................................... 6-3 How to Obtain Parts ............................................................................. 6-3 Manual Status Information................................................................... 6-3 Newer Instruments................................................................................ 6-4 Service Centers.......
HYDRA Service Manual 6-2
List of Replaceable Parts Introduction 6 6-1. Introduction This section contains an illustrated list of replaceable parts for the 2620A, 2625A, and 2635A. Parts are listed by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator.
HYDRA Service Manual 6-4. Newer Instruments Changes and improvements made to the instrument are identified by incrementing the revision letter marked on the affected pca. These changes are documented on a manual supplement which, when applicable, is included with the manual. 6-5. Service Centers To locate an authorized service center, call Fluke using any of the phone numbers listed below, or visit us on the World Wide Web: www.fluke.com 1-800-443-5853 in U.S.
List of Replaceable Parts Service Centers 6 Table 6-1. 2620A/2625A Final Assembly Reference Designator Description Fluke Stock No Tot Qty 814186 1 A1 MAIN PCA A2 DISPLAY PCA 814914 1 A3 A/D CONVERTER PCA 814202 1 A4 ANALOG INPUT PCA 814210 1 A5 IEEE-488 INTERFACE PCA 872593 1 A6 F1,2 MEMORY PCA W FUSE,5X20MM,0.125A,250V,SLOW 886135 1 822254 2 114116 2 H50 SCREW,FH,P,LOCK,STL,8-32,.375 H51 SCREW,PH,P,LOCK,SS,6-32,.375 334458 2 H52 SCREW,PH,P,LOCK,STL,6-32,.
HYDRA Service Manual Table 6-1. 2620A/2625A Final Assembly (cont) Reference Designator MP80 Description HYDRA STARTER SOFTWARE Fluke Stock No Tot Qty 890645 1 MP99 T/C CABLE,ASSY 871512 1 MP101 LABEL,VINYL,1.500,.
MP14 MP11 A6 (2620A Only) A5 (Option for 2625A) MP4 MP12 A2 H50 MP16 MP6 W2 H70 MP10 H52 A5 (Option -05) see Table 6-6 for replacement parts. MP59 MP15 1 W4 MP 56 MP22 MP20 MP7 MP48 H52 A1 MP5 MP17 A3 F1, F2 MP47 MP18 H53 MP35 MP1 H54 H51 MP13 MP23 List of Replaceable Parts Service Centers 6 2620A/2625A T&B (1 of 3) Figure 6-1. 2620A/2625A Final Assembly s55f.
HYDRA Service Manual W2 (Ref) H52 (Ref) A1 (Ref) Bottom View 2620A/2625A T&B (2 of 3) s56f.eps Figure 6-1.
List of Replaceable Parts Service Centers 6 A3 T1 (Ref) H52 (Ref) Top View W1 2620A/2625A T&B (3 of 3) s57f.eps Figure 6-1.
HYDRA Service Manual A4 MP2 MP66 MP3 A4 H65 MP67 2620A-100 s58f.eps Figure 6-1.
List of Replaceable Parts Service Centers 6 Table 6-2. 2635A Final Assembly Reference Designator Description Fluke Stock No Tot Qty 925669 1 A1 MAIN PCA A2 DISPLAY PCA 814194 1 A3 A/C CONVERTER PCA 814202 1 A4 ANALOG INPUT PCA 814210 1 A6 MEMORY CARD I/F PCA 931977 1 F1,2 W FUSE,5X20MM,0.125A,250V,SLOW 822254 2 H50 SCREW,FH,P,LOCK,STL,8-32,.375 114116 2 H51 SCREW,PH,P,LOCK,SS,6-32,.375 334458 2 H52 SCREW,PH,P,LOCK,STL,6-32,.
HYDRA Service Manual Table 6-2.
MP15 MP59 MP14 MP12 ? ? MP11 A2 H50 MP16 MP6 W2 H70 MP10 H52 A6 T1 A3 W3 MP101 A1 MP5 MP17 MP48 H52 H52 MP7 MP22 MP998 F1, F2 MP47 MP18 H53 MP101 MP35 MP1 H54 H51 MP13 MP23 List of Replaceable Parts Service Centers 6 2635A T&B (1 of 3) Figure 6-2. 2635A Final Assembly s59f.
HYDRA Service Manual Part of W2 MP102 H52 (Ref) A6 W3 (Cable Assembly) A1 Bottom View 2635A T&B (2 of 3) s60f.eps Figure 6-2.
List of Replaceable Parts Service Centers T1 (Ref) 6 A3 H52 W1 Top View 2635A T&B (3 of 3) s61f.eps Figure 6-2.
HYDRA Service Manual A4 MP2 MP66 MP3 A4 H65 MP67 2620A-100 s62f.eps Figure 6-2.
List of Replaceable Parts Service Centers 6 Table 6-3. 2620A/2625A A1 Main PCA Fluke Stock No Tot Qty IC,OP AMP,DUAL,LOW POWER,SOIC 867932 1 IC,OP AMP,QUAD,LOW POWER,SOIC 742569 2 CAP,CER,0.1UF,+-10%,25V,X7R,1206 747287 747287 747287 747287 747287 20 Reference Designator Description AR1 * AR2,AR3 * C1,C3,C8, C11,C19,C21C25,C27-29, C33,C36-38, C40-42 C2 CAP,CER,0.
HYDRA Service Manual Table 6-3. 2620A/2625A A1 Main PCA (Cont) Reference Designator 6-18 Description Fluke Stock No Tot Qty Q9 * TRANSISTOR,SI,NPN,30V,200MW,SOT-23 820902 1 R1,R2,R11, R12,R22 * * RES,CERM,47K,+-5%,.125W,200PPM 746685 746685 5 R3,R4,R14, R20,R21,R25, R42,R47,R64 * * * RES,CERM,10K,+-5%,.125W,200PPM 746610 746610 746610 9 R5 * RES,CERM,1K,+-1%,.125W,100PPM,1206 783241 1 R6 * RES,CERM,3.32K,+-1%,.125W,100PPM 810788 1 R7,R16 * RES,CERM,100K,+-5%,.
List of Replaceable Parts Service Centers 6 Table 6-3.
HYDRA Service Manual 2620A-1601 s63f.eps Figure 6-3.
List of Replaceable Parts Service Centers 6 Table 6-4. 2635A A1 Main PCA Reference Designator Description Fluke Stock No Tot Qty BT1 BATTERY,LITHIUM,3.0V,0.560AH 821439 1 C1,C18 CAP,AL,220UF,+-20%,35V,SOLV PROOF 929708 2 C2 CAP,CER,0.
HYDRA Service Manual Table 6-4. 2635A A1 Main PCA (cont) Fluke Stock No Tot Qty PCB ASSY, MAIN SM 932017 1 P4 HEADER,2 ROW,.050CTR,40 PIN 838573 1 P10 CABLE ASSY,FLAT,10 CONDUCT,6.
List of Replaceable Parts Service Centers 6 Table 6-4. 2635A A1 Main PCA (cont) Reference Designator Description Fluke Stock No Tot Qty RES,CERM,47,+-5%,.0625W,200PPM 927707 927707 927707 927707 927707 35 RT1 THERMISTOR,DISC,0.46,25 C 875240 1 RV1 VARISTOR,41.5V,+-9%,1.0MA,1206 914114 1 R66,R67,R69, R80,R82,R85, R87-91,R93R97 R99-106, R108-118 * * * * * S1 SWITCH,PUSHBUTTON,DPDT,PUSH-PUSH 836361 1 T1 TRANSFORMER,INVERTER 873968 1 T2 INDUCTOR,FXD,DUAL,EE24-25,0.4MH,1.
HYDRA Service Manual 2635A-1601 s64f.eps Figure 6-4.
List of Replaceable Parts Service Centers 6 Table 6-5. A2 Display PCA Fluke Stock No Tot Qty CAP,CER,0.1UF,+-10%,25V,X7R,1206 747287 5 CAP,TA,4.7UF,+-20%,16V,3528 745976 1 DIODE,SI,BV=75V,IO=250MA,SOT-23 830489 1 DS1 TUBE,DISPLAY,VAC FLUOR,7 SEG,10 CHAR 783522 1 J1 HEADER,1 ROW,.050CTR,20 PIN 831529 1 LS1 AF TRANSD,PIEZO,22 MM 602490 1 MP102 DISPLAY, PWB ASSY, SM 873901 1 MP321 WIRE,JUMPER,TEF,22AWG,WHT,.
HYDRA Service Manual CKT 1 CKT 2 2620A-4002 s65f.eps Figure 6-5.
List of Replaceable Parts Service Centers 6 Table 6-6. A3 A/D Converter PCA Reference Designator Description Fluke Stock No Tot Qty C1-3,C18,C21, C22,C25,C29, C33 CAP,CER,0.1UF,+-10%,25V,X7R,1206 747287 747287 747287 9 C4,C5 CAP,CER,15PF,+-10%,50V,C0G,1206 837393 2 C6,C7,C10 CAP,POLYPR,0.1UF,+-10%,160V 446781 3 C8,C9,C19 CAP,TA,10UF,+-20%,10V 714766 3 C11 CAP,POLYPR,2200PF,+-5%,100V 854505 1 C12 CAP,TA,2.2UF,+-10%,35V 697433 1 C13 CAP,POLYPR,0.
HYDRA Service Manual Table 6-6. A3 A/D Converter PCA (cont) Fluke Stock No Tot Qty RES,CF,270,+-5%,0.25W 810424 2 Reference Designator Description R13,R43 R14,R24-28 * RES,CERM,47K,+-5%,.125W,200PPM 746685 6 R15 * RES,CERM,61.9K,+-1%,.125W,100PPM 821330 1 R16,R17,R20 * RES,CERM,200K,+-5%,.125W,200PPM 746743 3 R18 * RES,CERM,16.9K,+-1%,.125W,100PPM 836635 1 R21 * RES,CERM,845,+-1%,.125W,100PPM 821322 1 R22 * RES,CERM,91K,+-5%,.
List of Replaceable Parts Service Centers 6 K3, K5-K14 Relay Polarity Install with marked end as shown. Aromat or Nais Omron 2620A-1603 s66f.eps Figure 6-6.
HYDRA Service Manual Table 6-7. A4 Analog Input PCA Reference Designator Description C1 CAP,CER,1000PF,+-5%,50V,C0G,1206 Fluke Stock No Tot Qty 867408 1 H55 RIVET,S-TUB,OVAL,AL,.087,.375 106473 2 L1 CORE,BALUN,FERRITE,.136,.079,.093 106184 1 M1,M2 HEADER,1 ROW,.
List of Replaceable Parts Service Centers 6 2620A-1604 s67f.eps Figure 6-7.
HYDRA Service Manual Table 6-8. A5 (Option -05) IEEE-488 Interface PCA Reference Designator Description Tot Qty 747287 3 C1-3 CAP,CER,0.1UF,+-10%,25V,X7R,1206 J1 HEADER,2 ROW,.100CTR,RT ANG,26 PIN 512590 1 J2 HEADER,2 ROW,.100CTR,24 PIN 831834 1 R1 * TP1 RES,CERM,5.1K,+-5%,.
List of Replaceable Parts Service Centers 6 2620A-1605 s68f.eps Figure 6-8.
HYDRA Service Manual Table 6-9. 2625A A6 Memory PCA Reference Designator Description C1-8 6-34 CAP,CER,0.1UF,+-10%,25V,X7R,1206 Fluke Stock No Tot Qty 747287 8 J1 HEADER,2 ROW,.
List of Replaceable Parts Service Centers 6 2625A-1606 s69f.eps Figure 6-9.
HYDRA Service Manual Table 6-10. 2635A A6 Memory Card I/F PCA Reference Designator Description Tot Qty C1-4,C6-8 CAP,CER,0.1UF,+-10%,25V,X7R,1206 747287 7 C5 CAP,TA,47UF,+-20%,10V,7343 867580 1 C9 CAP,TA,1UF,+-20%,35V,3528 866970 1 DS1 LED,RED,RIGHT ANGLE,3.0 MCD 927389 1 DS2 LED,YELLOW,RIGHT ANGLE,3 MCD 914242 1 P1 CONN,MEMORY CARD,HEADER,RT ANG,68 PIN 914184 1 P2 HEADER,2 ROW,.
List of Replaceable Parts Service Centers 6 2635A-1606 s70f.eps Figure 6-10.
HYDRA Service Manual 6-38
Chapter 7 IEEE-488 Option -05 Title 7-1. 7-2. 7-3. 7-4. 7-5. 7-6. 7-7. 7-8. 7-9. 7-10. 7-11. 7-12. 7-13. 7-14. 7-15. 7-16. 7-17. 7-18. 7-19. 7-20. 7-21. 7-22. 7-23. Introduction .......................................................................................... Theory of Operation ............................................................................. Functional Block Description ..........................................................
HYDRA Service Manual 7-2
IEEE-488 Option -05 Introduction 7 7-1. Introduction The IEEE-488 Interface turns the Data Acquisition Unit 2620A into a fully programmable instrument for use with the IEEE Standard 488.1 (1987) interface bus (IEEE-488 bus). With the IEEE-488 Interface, the instrument can become part of an automated instrumentation system. The IEEE-488 Interface cannot be used with the Hydra Data Logger (2625A). 7-2. Theory of Operation 7-3.
HYDRA Service Manual 7-5. Main PCA Connector The IEEE-488 PCA interfaces to the Main PCA through a 26-pin, right-angle connector (A5J1). This connector routes the 8-bit data bus, the lower three bits of the address bus, memory control, system clock, and address decode signals from the Main PCA to the IEEE-488 PCA. The IRQ2* interrupt request signal is routed from the IEEE-488 PCA to the Main PCA. The IEEE-488 PCA is powered by the +5.1V dc power supply (VCC).
IEEE-488 Option -05 General Maintenance 7-7. 7 IEEE-488 Transceivers/Connector The IEEE-488 Transceivers (A5U2 and A5U3) are octal transceivers that are specifically designed to exhibit the proper electrical drive characteristics to meet the IEEE-488 standard. These transceivers are configured to match the control signals available on the IEEE-488 Controller. Assuming that A5U1-33 is always high, Table 7-2 describes the transceiver direction control.
HYDRA Service Manual MOUNTING SCREW (2) GROUNDING SCREW CASE REAR BEZEL REMOVE PLASTIC PLUG FROM CASE CHASSIS IEEE-488 PCA RETAINING SCREWS 6-32,1/4 INCH PANHEAD SCREW 24-LINE RIBBON CABLE ASSEMBLY s53f.eps Figure 7-1.
IEEE-488 Option -05 Performance Testing 7 7-10. Installing the IEEE-488 Option 1. Place the IEEE-488 PCA into position so that the edge of the pca fits in the chassis guide. Then line up connecting pins with the matching connector on the Main PCA, and slide the pca into position. 2. Install the single 6-32, 1/4-inch panhead Phillips head screw in the corner of the IEEE-488 PCA. 3. If necessary, attach the rear panel connector using 7 mm nut driver. 4.
HYDRA Service Manual 7-12. Troubleshooting 7-13. Power-Up Problems The following discussion identifies probable fault areas if the installation of an IEEE488 Option causes power-up failure for the instrument. The problem is probably a short on A5J1; the Microprocessor on the Main Assembly is prevented from accessing ROM and RAM correctly. • First check if VCC is shorted to GND on the IEEE Assembly. • The short may also be caused by an interface signal to either VCC, GND, or another interface signal.
IEEE-488 Option -05 List of Replaceable Parts 7 7-18. Failure to Receive Multiple Character Commands Monitor the IRQ2* interrupt signal from A5U1-10 during attempts to communicate with the instrument. Each byte received with the ATN signal (A5U1-31) high should cause the interrupt signal to go low. Verify that the signal arrives at A5J1 properly. An interrupt not detected by A1U4 will remain low indefinitely.
HYDRA Service Manual 7-10
Chapter 8 Schematic Diagrams Figure 8-1. 8-2. 8-3. 8-4. 8-5. 8-6. 8-7. 8-8. Title Page A1 Main PCA (2620A/2625A)..............................................................................8-3 A1 Main PCA (2635A)..........................................................................................8-8 A2 Display PCA ....................................................................................................8-14 A3 A/D Converter PCA............................................................
HYDRA Service Manual 8-2
Schematic Diagrams 8 2620A-1601 s88f.eps Figure 8-1.
Schematic Diagrams NOTES: 1. 8 UNLESS OTHERWISE SPECIFIED ALL RESISTORS ARE 1/4W 5%. ALL CAPACITOR VALUES ARE IN MICROFARADS.
Schematic Diagrams 8 RT1 CR1 RAW SUPPLY DCH MBRD360 DCH SH4 RXE065 DCL SH4 C59 180PF PFAIL* SH3 DCL 1/8A SB J3 T401 3 L R48 10K S1 O1 1N5397 250V INGUARD SUPPLIES POWER FAIL DETECTION CR3 P1 U6 C39 .047 C1 2 R43 39K O2 P2 R45 C2 CR2 R42 10K 1.0M 1% 1 EG 1N5397 TP7 U19 C7 10000 35V IN TL317 OUT R39 3 63.4K 1% 2 U24 LM393DT 4 +5.2V Q2 MMBT3906 C9 Q1 VR4 LM385 1.23V ADJ R5 1.00K 1% 20 R41 11.0K 1% IBIAS R6 3.
Schematic Diagrams 8 2620A-1001 (3 of 4) s73f.eps Figure 8-1.
Schematic Diagrams 8 VCC Z3 1 R58 20 47K 470 Z 2 16 1 CR15 BAW56 VCC AR1 LM358DT 8 22K C54 180PF 6 7 1 10 5 Z1 Z3 2 4 350K R49 19 47K 19 470 Z 2 16 2 55K TP19 3 4 U14 2 9 8 TP20 10 U28 10 HC00 4 11 U28 HC4040 10 HC244 BINARY D7 D6 D5 D4 D3 D2 D1 D0 1 10 2 15 0 3 3Y 3 A 17 1 5 2 Y 2 A 15 2 7 1Y 1A 13 3 U29 Q7 7 Q7 9 9 0 Y 0 A C50 2 11 6 19 10 AR2 LM324D Z1 350K 5 11 5 HC86 CR18 BAW56 U27 7 HC86 3Y 3 A 8 5 14 2 Y
Schematic Diagrams 8 POWER SUPPLY PIN NUMBERS REF DES GND VCC (5.0V dc) VBB (+5V dc) COM VDDR (5.
Schematic Diagrams RT1 CR1 2620A-6501 1/8A SB J3 MBRD360 RXE065 CR3 C59 1 L 180PF 1N5397 SHEET 5 DCH DCL SHEET 4 VPF S1 C2 2 .033 100V N R20 CR2 R13 20 R19 1N5397 OFF Q2 IN R48 R11 OUT MBR140 R44 C39 C1 C7 220 35V 10000 35V T1 NOTE: U22 AND U23 ARE BIASED BY IBIAS C4 1.0 50V LM317T IN OUT VDDR P10 ADJ R6 R5 3.32K 1% 1.00K 1% TP30 470 16V IBIAS 9 6 7 4 5 1 10 8 C6 10 63V RCOM SHLD C34 11 1.
Schematic Diagrams 8 2635A-1001 (2 of 5) s76f.eps Figure 8-2.
Schematic Diagrams 8 2635A-1001 (3 of 5) s77f.eps Figure 8-2.
Schematic Diagrams 8 KEYBOARD I/F J2 15 16 20 19 17 18 SWR1 SWR2 SWR6 SWR5 SWR3 SWR4 6 4 5 3 A<23..
Schematic Diagrams 8 XTI TOTI* EXTERNAL TRIGGER AND TOTALIZER INPUTS VCC VCC 10 350K CR14 5 9 18 8 1 18 10 17 15 1 14 10 350K 55K 2 6 17 12 10 Z1 350K 1 8 6 10 350K 4 10 13 11 10 8 10 5 55K 7 C52 C53 180PF 1000PF DO_GND 16 R60 22K 14 U17 Z2 U27 1T 47 1/4W C56 RV1 41V 180PF 47 1/4W 16 22K 9 3 R50 Z3 8 7 47 1/4W C57 11 11 47K L1 6T R61 Z2 9 ULN2004 ULN2004 13 U17 2 180PF 9 L2 16 22K 15 C45 22K 47 1/4W 180PF 47 1/4W 16 6 Z1 350K
Schematic Diagrams 8 CKT 1 CKT 2 2620A-4002 s90f.eps Figure 8-3.
Schematic Diagrams 8 POWER SUPPLY PIN NUMBERS REF DES A2U1 A2U4 A2U5 A2U6 A2Z1 VCC (5.1V dc) 21 16 10, 16 14 16 GND VEE (5.0V dc) 42 2, 8 8 7, 9, 10 -- 4 ----- VLOAD (-28.5 to -30.0V dc) 5 ----- 2620A-1002 s80c.eps Figure 8-3.
Schematic Diagrams 8 K3, K5-K14 Relay Polarity Install with marked end as shown. Aromat or Nais Omron 2620A-1603 s91c.eps Figure 8-4.
Schematic Diagrams 8 POWER SUPPLY PIN NUMBERS REF DES VCC (5.3V dc) VSS (5.4V dc) ANALOG_GND VDDR (5.6V dc) A3U1 A3U2 A3U3 -A3U4 A3U5 A3U6 A3U7 A3U8 A3U9 A3U10 A3U11 A3U12 A3U13 A3U14 A3Z1 A3Z2 A3Z3 3 1, 16 1, 10, 11, 12, 13, 14 ----1 5, 6, 9, 36 ---8 8 -1 -- -8 ------44 -----4 ---- 10, 11, 12 6, 9 2, 7 ---1, 3, 4 3 4, 25, 27, 38 2, 45 ---4 -4 -8 ----9 9 ----9 9 9 ------ RCOM ----8 8 ----8 8 8 ------ 2620A-1003 (1 of 3) s81c.eps Figure 8-4.
Schematic Diagrams 8 2620A-1003 (2 of 3) s82c.eps Figure 8-4.
Schematic Diagrams 8 2620A-1003 (3 of 3) s83c.eps Figure 8-4.
Schematic Diagrams 8 2620A-1604 s92f.eps Figure 8-5.
Schematic Diagrams TB2 NOTES: UNLESS OTHERWISE SPECIFIED. ALL CAPACITOR VALUES ARE IN MICROFARADS.
Schematic Diagrams 8 2620A-1605 s93f.eps Figure 8-6.
Schematic Diagrams REF DES POWER SUPPLY PIN NUMBERS VCC (5.1V dc) A5U1 A5U2 A5U3 A5U4 8 3, 44 20 20 14 GND 22 10,11 10 1,2,4,5,7,9,10 2620A-1005 s85c.eps Figure 8-6.
Schematic Diagrams 8 2625A-1606 s94f.eps Figure 8-7.
Schematic Diagrams REF DES POWER SUPPLY PIN NUMBERS VCC (5.1V dc) A6U1 A6U2 A6U3 A6U4 A6U5 A6U6 A6U7 A6U8 8 20 14 14 5 14 32 32 16 GND 1, 10 7, 12, 13 7 3, 12 7 16 16 5, 8 2625A-1006 s86c.eps Figure 8-7.
Schematic Diagrams REF DES A6U1 --A6U2 A6U3 POWER SUPPLY PIN NUMBERS VCC (5.0V dc) 1, 11, 12, 13, 14, 15, 17,18 19, 20, 21, 31, 41, 51, 61, 71, 81, 91, 101, 105, 111, 7 2, 4, 6, 7, 8, 10 GND 16, 27, 46, 60, 76, 106, 107, 113, 116, 120 -14 20 8 Reference Designations Lasted Used C DS P Q R TP U Z C9 DS2 P2 Q1 R15 TP1 U3 Z3 Not Used ----R14 --Z1 2635A-1606 s95f.eps Figure 8-8.
Schematic Diagrams Q1 VCC P2 R11 DS2 DS1 VPP1 VPP2 VCC VCC R17 R9 47K 47K C9 C6 1.0 35V .1 25V CD<0> 58 66 32 65 33 63 62 31 64 30 RESET D10 D2 D9 WP BVD1 BVD2 D1 D8 D0 CA<0> CA<1> CA<2> CA<3> REG* CA<4> CA<5> CA<6> CA<25> 44 45 57 60 43 29 28 27 26 61 25 24 23 56 RFU1 RFU2 RFU3 RFU4 RFSH A0 A1 A2 A3 REG A4 A5 A6 A25 CVCC CRESET Z2 1.
Schematic Diagrams 8 8-28
