® 5725A Amplifier Instruction Manual PN 823435 January 1989 Rev. 6, 6/96 © 1993, 1996 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
Table of Contents Chapter 1 Title Introduction and Specifications........................................................ 1-1 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. 1-7. 1-8. 1-9. 2 Introduction .......................................................................................... Where to Go From Here....................................................................... How to Use the Manuals. ..................................................................... 5725A Instruction Manual ..................
5725A Instruction Manual 4 Theory of Operation........................................................................... 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. 4-27. 4-28. 4-29. 4-30. 4-31. 4-32. 4-33. 4-34. 4-35. 4-36. 4-37. 4-38. 4-39. 4-40. 4-41. 4-42. 4-43. 4-44. 4-45. 4-46. 4-47. 4-48. 4-49. 4-50. 4-51. 4-52. 4-53. Introduction .............................................................
Contents (continued) 4-54. 4-55. 4-56. 4-57. 4-58. 4-59. 4-60. 5 7-6. 7-7. 7-8. 7-9. 7-10. 6-3 6-3 6-4 6-5 6-5 6-6 6-7 6-9 6-9 6-11 6-12 6-13 6-14 6-14 6-15 Introduction .......................................................................................... 5725A Fault Codes............................................................................... Self Diagnostics.................................................................................... Manual Tests for Fault Isolation ................
5725A Instruction Manual iv
List of Tables Table 2-1. 2-2. 3-1. 3-2. 4-1. 4-2. 4-3. 4-4. 7-1. 7-2. 8-1. 8-2. 8-3. 8-4. 8-5. 8-6. 8-7. 8-8. 8-9. Title Standard Equipment............................................................................................... Line Power Cord Types Available from Fluke...................................................... Front Panel Features .............................................................................................. Rear Panel Features .........................................
5725A Instruction Manual vi
List of Figures Figure 2-1. 2-2. 2-3. 2-4. 3-1. 3-2. 4-1. 4-2. 4-3. 4-4. 4-5. 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 8-1. 8-2. 8-3. 8-4. 8-5. 8-6. 8-7. 8-8. 8-9. 9-7. Title Page Line Power Cords Available for Fluke Instruments .............................................. Correct Way to Dress Interface Cable ................................................................... Line Power Label and Switch Location................................................................. Accessing the Fuse ............
5725A Instruction Manual viii
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. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation.
OPERATOR SAFETY SUMMARY WARNING HIGH VOLTAGE is used in the operation of this equipment LETHAL VOLTAGE may be present on the terminals, observe all safety precautions! To avoid electrical shock hazard, the operator should not electrically contact the output hi or sense hi binding posts. During operation, lethal voltages of up to 1100V ac or dc may be present on these terminals.
Symbols Marked on Equipment DANGER — High Voltage Protective ground (earth) terminal Attention — refer to the manual. This symbol indicates that information about the usage of a feature is contained in the manual. Power Source The 5725A is intended to operate from a power source that will not apply more than 264V ac rms between the supply conductors or between either supply conductor and ground.
SERVICING SAFETY SUMMANY FOR QUALIFIED SERVICE PERSONNEL ONLY Also refer to the preceding Operator Safety Summary Do Not Service Alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present. Use Care When Servicing With Power On Dangerous voltage exist at many points inside this product. To avoid personal injury, do not touch exposed connections and components while power is on.
FIRST AID FOR ELECTRIC SHOCK Free the Victim From the Live Conductor Shut off high voltage at once and ground the circuit. If high voltage cannot be turned off quickly, ground the circuit. If the circuit cannot be broken or grounded, use a board, dry clothing, or other nonconductor to free the victim. Get Help! Yell for help. Call an emergency number. Request medical assistance.
Chapter 1 Introduction and Specifications Title 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. 1-7. 1-8. 1-9. Introduction .......................................................................................... Where to Go From Here....................................................................... How to Use the Manuals ...................................................................... 5725A Instruction Manual ............................................................... 5700A Operator Manual ..............
5725A Instruction Manual 1-2
Introduction and Specifications Introduction Introduction 1 1-1. The Fluke 5725A Amplifier enhances the 5700A Calibrator in the ac voltage, ac current, and dc current functions. The 5725A operates under complete control of the 5700A through an interface cable supplied with the 5725A. A diagram in the specifications tables at the end of this section illustrates the extended ac volt-hertz product achieved by using a 5725A.
5725A Instruction Manual Where to Go From Here 1-2. This manual is the operator and service manual for the 5725A. However, because the 5725A operates under the control of the 5700A Calibrator, most operating instructions for the 5725A are in the 5700A manuals. Topics such as selecting output values, connecting to a UUT (Unit Under Test), and self calibration are covered in the 5700A Operator Manual.
Introduction and Specifications How to Use the Manuals How to Use the Manuals 1 1-3. The following paragraphs describe how each manual addresses the 5725A. 5725A Instruction Manual 1-4. Use the 5725A Instruction Manual for installing the 5725A, learning about its front and rear panel features, and for all service-related topics such as maintenance, troubleshooting, parts lists, and schematics. (The 5725A Instruction Manual is the service and operator manual for the 5725A.
5725A Instruction Manual 5700A Service Manual 1-8. The 5700A Service Manual is a maintenance guide for the 5700A. The following 5725A topics are included in the 5700A Service Manual: • Specifications for both the 5700A and 5725A (these same specifications are in this Instruction Manual) • Full verification of the 5700A and 5725A (recommended every two years) • Calibration of the 5700A and 5725A (same procedure as in the 5700A Operator Manual) Specifications 1-9.
Introduction and Specifications Specifications 1 DC Voltage Absolute Uncertainty ± 5°C from calibration temperature Range Resolution 24 Hours 90 Days 180 Days Relative Uncertainty ± 1°C 1 Year ± (ppm output + µV) 24 Hours 90 Days ± (ppm output + µV) 220 mV 10 nV 6.5 + .75 7 + .75 8 + .75 9 + .8 2.5 + .5 4 + .5 2.2V 100 nV 3.5 + 1.2 6 + 1.2 7 + 1.2 8 + 1.2 2.5 + 1.2 4 + 1.2 11V 1 µV 3.5 + 3 5+4 7+4 8+4 1.5 + 3 3.5 + 4 22V 1 µV 3.5 + 6 5+8 7+8 8+8 1.5 + 6 3.
5725A Instruction Manual AC Voltage Range Resolution Frequency 24 Hours 22 mV 220 mV 2.2V 22V 1 nV 10 nV 100 nV 1 µV 10 µV Relative Uncertainty ± 1°C 90 Days 180 Days 1 Year ± (ppm output + µV) Hz 2.2 mV Absolute Uncertainty ± 5°C from calibration temperature 100 µV 1100V 11 mV 90 Days ± (ppm output + µV) 10-20 20-40 40-20k 20k-50k 50k-100k 100k-300k 300k-500k 500k-1M 500 + 5 200 + 5 100 + 5 340 + 5 800 + 8 .11% + 15 .15% + 30 .4% + 40 550 + 5 220 + 5 110 + 5 370 + 5 900 + 8 .
Introduction and Specifications Specifications 1 AC Voltage (continued) Secondary Performance Specifications and Operating Characteristics Included in Uncertainty Specifications Range 2.2 mV 22 mV 220 mV 2.
5725A Instruction Manual AC Voltage (continued) Secondary Performance and Operating Characteristics (continued) Included in Uncertainty Specifications 5725A Amplifier: Temperature Coefficient Stability Range ±1°C Frequency Load Regulation Distortion [Note 2] Bandwidth 0°-10°C 10°-40°C 24 Hours 10 Hz-10 MHz and 40°-50°C ±(ppm output + mV) Hz ±(ppm output)/°C ±(ppm output + mV) ±(% output) 150 pF 1000 pF 40-1k 10 + .5 5 5 10 + 1 .10 .10 1k-20k 15 + 2 5 5 90 + 6 .10 .
Introduction and Specifications Specifications 1 Resistance Nominal Value Ω 0 1 1.9 10 19 100 190 1k 1.9k 10k 19k 100k 190k 1M 1.9M 10M 19M 100M Absolute Uncertainty of Characterized Value ±5°C from calibration temperature [Note 1] 24 Hours 90 Days 180 Days 1 Year ±ppm 50 µΩ 40 33 8 7 4 4 3.5 3.5 3.5 3.5 3.5 3.5 5 6 14 24 60 50 µΩ 32 25 5 4 2 2 2 2 2 2 2 2 2.5 3.
5725A Instruction Manual Current Derating Factors Nominal Value Value of Derating Factor K for Over or Under Current Two-Wire Comp I
Introduction and Specifications Specifications 1 DC Current Range Resolution Absolute Uncertainty ±5°C from calibration temperature For fields strengths >1 V/m but <3 V/m, add 1% of range Relative Uncertainty ±1°C 24 Hours 24 Hours 90 Days 180 Days 1 Year ± (ppm output + nA) nA 90 Days ± (ppm output + nA) 220 µA .1 45 + 10 50 + 10 55 + 10 60 + 10 24 + 2 2.
5725A Instruction Manual AC Current Absolute Uncertainty Frequency Range Resolution 2.2 mA 22 mA 10 nA 100 nA 2.2A 1 µA 10 µA 180 Days 1 Year 24 Hours 90 Days ± (ppm output + nA) 10-20 650 + 30 700 + 30 750 + 30 800 + 30 450 + 30 500 + 30 20-40 350 + 25 380 + 25 410 + 25 420 + 25 270 + 25 300 + 25 40-1k 120 + 20 140 + 20 150 + 20 160 + 20 110 + 20 120 + 20 1k-5k 500 + 50 600 + 50 650 + 50 700 + 50 450 + 50 500 + 50 5k-10k .15% + 100 .16% + 100 .17% + 100 .
Introduction and Specifications Specifications 1 AC Current (continued) Secondary Performance Specifications and Operating Characteristics Included in Uncertainty Specifications Maximum Temperature Coefficient Noise and Stability Range Resistive [Note 1] ±1°C Frequency Distortion Compliance 24 Hours 0°-10°C 10°-40°C Limits and 40°-50°C 220 µA 2.2 mA 22 mA 220 mA 2.2A ± (ppm output + nA)/°C Load For Full Bandwidth Accuracy 10 Hz-50 kHz [Note 2] <0.
5725A Instruction Manual Wideband AC Voltage (Option -03) Specifications apply to the end of the cable and 50Ω termination used for calibration: Absolute Uncertainty ±5°C from calibration temperature 30 Hz-500 kHz Range Volts Resolution dBm 24 Hours 90 Days 180 Days 1 Year ± (% output + µV) 1.1 mV -46 10 nV .4 + .4 .5 + .4 .6 + .4 .8 + 2 3 mV -37 10 nV .4 + 1 .45 + 1 .5 + 1 .7 + 3 11 mV -26 100 nV .2 + 4 .35 + 4 .5 + 4 .7 + 8 33 mV -17 100 nV .2 + 10 .3 + 10 .45 + 10 .
Introduction and Specifications Specifications 1 General Specifications: Warm-Up time: 2 X the time since last warmed up, to a maximum of 30 minutes. System installation: Rear output configuration and rack- mount kit available. Standard interfaces: IEEE-488, RS-232, 5725A, 5205A or 5215A, 5220A, phase lock in (BNC), phase reference out (BNC). Temperature performance: Operating: 0°C to 50°C. Calibration: 15°C to 35°C. Storage: -40°C to 75°C.
5725A Instruction Manual 1-18
Chapter 2 Installation Title 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 2-9. Introduction .......................................................................................... Unpacking and Inspection .................................................................... Service Information .............................................................................. Placement and Rack Mounting............................................................. Cooling Considerations ..........................
5725A Instruction Manual 2-2
Installation Introduction 2 Warning The 5725A amplifier is capable of supplying lethal voltages. Do not touch the 5700A output terminals. Read this section before operating the 5725A. Introduction 2-1. This section provides instructions for unpacking and installing the 5725A. Procedures for line voltage selection, fuse replacement, and connection to line power and the 5700A Calibrator are provided here. Read this section before operating the 5725A.
5725A Instruction Manual Table 2-2. Line Power Cord Types Available from Fluke TYPE VOLTAGE/CURRENT North America North America Universal Euro United Kingdom Switzerland Australia South Africa LC-1 120V/15A 240V/15A 220V/16A 240V/13A 220V/10A 240V/10A 240V/5A LC-2 LC-5 FLUKE OPTION NUMBER LC-1 LC-2 LC-3 LC-4 LC-5 LC-6 LC-7 LC-3 LC-6 LC-4 LC-7 aq2f.eps Figure 2-1.
Installation Service Information Service Information 2 2-3. Each 5725A Amplifier is warranted to the original purchaser for a period of one year beginning on the date received. The warranty is located at the front of this manual. Factory-authorized service and technical advice for the 5725A is available at Fluke Service Centers. Section 8 contains a list of Service Centers. Warning Servicing described in this manual is to be done by qualified service personnel only.
5725A Instruction Manual Connecting to the 5700A Calibrator 2-6. Proceed as follows to connect the 5725A to the 5700A: 1. Turn the power off for both instruments and disconnect their line power cords. 2. Connect either end of the interface cable to the 5725A connector labeled 5700A. Dress the cable only as Figure 2-2 shows. The figure shows how to dress the cable in installation arrangements with the 5725A on top or bottom. 3. Connect the other end to the 5700A connector labeled 5725A.
Installation Selecting Line Voltage Selecting Line Voltage 2 2-7. The 5725A arrives from the factory configured for the line voltage normally appropriate for the country of purchase, or as specified at the time of purchase. Check the line power label on the rear panel of the 5725A to verify that the line voltage matches local line power. Figure 2-3 shows the location of the line power label and switches, and the switch settings for each line voltage.
5725A Instruction Manual Accessing the Fuse 2-8. wCaution To prevent instrument damage, verify that the correct fuse is installed for the line voltage setting. Acceptable fuse types are Bussman type MTH or Littelfuse type 312 or equivalent, of the appropriate amperage rating. Use only a 4A, 250V fast-blow fuse when the line voltage selection switches are set in the range 200-240V. Note A spare 4A, 250V fuse is shipped with the 5725A to ensure that one is available for use on the 200-240V range.
Installation Connecting to Line Power Connecting to Line Power 2 2-9. Warning To avoid shock hazard, connect the factory-supplied, threeconductor line power cord to a properly grounded power outlet. Do not use a two-conductor adapter or extension cord; this will break the protective ground connection. After verifying that the line voltage selection switches are correctly set, verify that the correct fuse is installed. Connect the 5725A to a properly grounded three-prong outlet.
5725A Instruction Manual 2-10
Chapter 3 Operating Notes 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. Introduction .......................................................................................... Front Panel Features............................................................................. Rear Panel Features.............................................................................. Turning on the 5725A Amplifier.......................................................... Warm Up .................
5725A Instruction Manual 3-2
Operating Notes Introduction Introduction 3 3-1. This section provides setup and operation information for the 5725A Amplifier. This section begins with a reference for the 5725A front and rear panel features. Information about setting up and powering up the 5725A follows. Please read this information before operating the amplifier. Also contained in this section is a description of all 5725A operating functions and modes.
5725A Instruction Manual Front Panel Features 3-2. Front panel features are called out in Figure 3-1. Each front panel feature is described in Table 3-1. 4 1 3 2 CURRENT OUTPUT VOLTAGE MODE CURRENT MODE HI 5725A STANDBY 11A MAX FAULT LO POWER OVERLOAD 2OV PK MAX CABLE OFF 8 6 5 7 aq6f.eps Figure 3-1.
Operating Notes Rear Panel Features 3 Table 3-1. Front Panel Features A CURRENT OUTPUT Binding Posts The source of all amplified current if the 5725A is configured for front output. You can set the 5700A to source all unamplified as well as amplified current through these binding posts. The LO binding post is isolated from ground when in the current function, and is open-circuited at other times. Cable and connection recommendations are made in Section 4 of the 5700A Operator Manual.
5725A Instruction Manual Rear Panel Features 3-3. Rear panel features are called out in Figure 3-2. Each rear panel feature is briefly described in Table 3-2. 1 WARNING GROUNDING JOHN FLUKE MFG. CO., INC. MADE IN U.S.A. CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING. CONNECTOR IN POWER CORD MUST BE CONNECTED TO ENSURE PROTECTION FROM ELECTRONIC SHOCK.
Operating Notes Turning on the 5725A Amplifier 3 Table 3-2. Rear Panel Features A CURRENT OUTPUT Binding Posts The source of all amplified current if the 5725A is configured for rear output. You can set the 5700A to source all its unamplified as well as amplified current through these binding posts. The LO binding post is isolated from ground when in the current function, and is open-circuited at other times. Cable and connection recommendations are made in Section 4 of the 5700A Operator Manual.
5725A Instruction Manual Turning on the 5725A Amplifier 3-4. Warning To avoid electric shock, make sure the 5725A is safely grounded as described in section 2. Caution Before turning the 5725A on, make sure that the line voltage selection switches are set properly for your line voltage. Refer to Figure 2-3 or the line voltage switch label and check the line voltage setting now if you have not already done so.
Operating Notes 5725A Operating Functions and Modes 5725A Operating Functions and Modes 3 3-6. Warning Both the 5700A and 5725A can produce fatal voltages. boosted voltage operation produces high voltage at higher current levels than normally available from the 5700A. during 5725A voltage operation, the potential risk of injury or fatal accident is greater than during unamplified 5700A voltage operation.
5725A Instruction Manual Voltage Standby 3-8. BOOST LIT NO OUTPUT OUTPUT V ΩA CURRENT OUTPUT VOLTAGE MODE CURRENT MODE HI 5725A STANDBY 11A MAX LO 2OV PK MAX FAULT NO OUTPUT SENSE V ΩA µ WIDEBAND HI HI LO LO OVERLOAD CABLE OFF HI AUX CURRENT GUARD GROUND • aq9i.eps Voltage standby mode is when both VOLTAGE MODE and 5725A STANDBY indicators are lit. In voltage standby mode, the 5725A is not supplying an output.
Operating Notes 5725A Operating Functions and Modes Current Standby 3-9. BOOST LIT NO OUTPUT OUTPUT V ΩA CURRENT OUTPUT VOLTAGE MODE CURRENT MODE HI 5725A STANDBY 11A MAX LO 2OV PK MAX 3 FAULT NO OUTPUT SENSE V ΩA µ WIDEBAND HI HI LO LO OVERLOAD CABLE OFF HI AUX CURRENT GUARD GROUND • aq10i.eps Current standby mode is when both CURRENT MODE and 5725A STANDBY indicators are lit. In current standby mode, the 5725A is not supplying an output.
5725A Instruction Manual Voltage Operate 3-10. BOOST LIT NO OUTPUT CURRENT OUTPUT VOLTAGE MODE CURRENT MODE HI 5725A STANDBY 11A MAX LO 2OV PK MAX FAULT VOLTAGE OUTPUT HERE OUTPUT V ΩA SENSE V ΩA µ WIDEBAND HI HI LO LO OVERLOAD CABLE OFF HI AUX CURRENT GUARD GROUND • aq11i.eps Warning Both the 5700A and 5725A can produce fatal voltages. boosted voltage operation produces high voltage at higher current levels than normally available from the 5700A.
Operating Notes Conditions That Activate the 5725A Current Operate 3-11. CURRENT OUTPUT HERE BOOST LIT OUTPUT V ΩA CURRENT OUTPUT VOLTAGE MODE CURRENT MODE HI 5725A STANDBY 11A MAX LO 2OV PK MAX 3 FAULT NO OUTPUT SENSE V ΩA µ WIDEBAND HI HI LO LO OVERLOAD CABLE OFF HI AUX CURRENT GUARD GROUND • aq12i.eps Note An overcompliance fault occurs if a low-resistance load is not connected to the enabled 5725A binding posts when entering current operate mode.
5725A Instruction Manual Conditions That Activate the 5725A 3-12. When the 5725A is connected to the 5700A, and is selected as the amplifier for the active output function, it supplies an output under the conditions shown in the following list. (These conditions are the same as VOLTAGE OPERATE and CURRENT OPERATE as previously described.) • Whenever current above 2.2A is selected and the 5700A is set to operate. (Output available at the 5725A binding posts.
Chapter 4 Theory of Operation 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. 4-27. 4-28. 4-29. Introduction .......................................................................................... Overall Functional Description ............................................................ 1100V AC Range Functional Description ....................................... 11A Range Functional Description..
5725A Instruction Manual 4-30. 4-31. 4-32. 4-33. 4-34. 4-35. 4-36. 4-37. 4-38. 4-39. 4-40. 4-41. 4-42. 4-43. 4-44. 4-45. 4-46. 4-47. 4-48. 4-49. 4-50. 4-51. 4-52. 4-53. 4-54. 4-55. 4-56. 4-57. 4-58. 4-59 4-60. 4-2 Optoisolator Link......................................................................... Break-Detect Circuitry................................................................. Power Up and Reset Circuitry ..................................................... Watchdog Timer ..................
Theory of Operation Introduction Introduction 4 4-1. This section presents theory of operation in increasing level of detail. The 5725A Amplifier is first broadly defined in an overall functional description and block diagram. The overall functional description continues in more detail with functional descriptions by function (ac V, dc I, ac I, and standby). The overall picture is completed with a detailed discussion of how the 5700A and 5725A communicate.
5725A Instruction Manual Figure 4-1.
Theory of Operation Overall Functional Description • 4 11A DC Function: The 11A dc function is implemented with a transconductance (voltage in/current out) amplifier with a gain of -5. If the 5700A outputs -2V into the 5725A, the 5725A output is 10A. (This is transparent to the user.) The output range is 0 to 11A. The 5725A delivers amplified current to either the front or rear panel binding posts of the 5725A, depending on an internal hardware setup.
5725A Instruction Manual The 5700A/5725A system uses the following method for ac amplitude control: 1. An rms thermal sensor alternately measures two signals: an unknown but adjustable ac signal, and a known calibrated dc signal. 2. The output of the thermal sensor is measured by the adc, allowing settling time for the sensor each time its input is changed. The ac signal is adjusted until the thermal sensor output is the same for both signals.
Theory of Operation Overall Functional Description Operation in the 11A DC Range 4 4-5. For the dc current function, the 5700A is configured for the dc 2.2V range. The 5700A 2V dc range drives an error amplifier with an input impedance of 40 kΩ. The gain of this amplifier is determined by this 40 kΩ resistor with a 4 kΩ feedback resistor, and the value of the precision shunt. The 5725A uses a 0.02Ω shunt for the 11A function. There is no feedback to the 5700A.
5725A Instruction Manual How the 5700A and 5725A Communicate 4-10. The 5725A and 5700A maintain all analog and digital communication over an external cable connected to subminiature D-type connectors on the back of each instrument. All in-guard (analog) signals, except B-VGRD, connect to relays that isolate the 5725A and 5700A whenever the 5725A is not in use. Digital communication occurs over five out-guard (digital) 5700A lines, B-SCT, B-SCR, B+5V, B+5VCOM, and B-CINT*.
Theory of Operation Overall Functional Description Description of the In-Guard Lines 4 4-12. The following list describes the 11 5725A in-guard lines: • B-RCL High-quality analog line from the 5725A which carries critical signals to be measured by the 5700A adc during either 5725A calibration or 5725A self diagnostics.
5725A Instruction Manual Inside the 5725A, B-SENSE LO is buffered by the 5725A, with the equivalent voltage called MCOM. • B-FEEDBACK During ac voltage operation, B-FEEDBACK is the output of the High Voltage Sense assembly; this signal represents B-SENSE HI divided by -100, and drives the 5700A ac/dc thermal sensor. During low-frequency ac voltage calibration, this is the sense path for the -260V dc from the 5700A Power Amplifier.
Theory of Operation Detailed Circuit Description • High Voltage Power Amplifier Assembly (A3) • • • • • 4 Power amplifier Harness to heat sink and its high voltage power devices Connections to the output transformers High voltage heat sink temperature monitoring circuitry High Voltage Sense Assembly (A6): • • • • • • • • High voltage sense (attenuator) and calibration circuits 5725A input and output switching relays, relay drivers Analog monitor, an 8-bit dac, latch for mux, latch for dac Subminiatur
5725A Instruction Manual Power Supply Assembly (A4) 4-16. The Power Supply assembly (A4) provides regulated system supplies for all 5725A assemblies except as noted below, as well as unregulated fan supply and high voltage supplies for the High Voltage Amplifier. The assembly also includes microprocessorcontrolled switching and an independent current-limit circuit. Note Other power supplies are contained on the Current Amplifier assembly (A2).
Theory of Operation Detailed Circuit Description High Voltage Supply Section 4 4-17. The high voltage supply allows normal operation from a pair of nominal 400V dc supplies, or troubleshooting operation in a reduced voltage mode with a pair of nominal 50V dc supplies. Switching between normal and reduced-voltage operation is done by removing the plug from J301 and inserting it into J303. See Section 7 for the procedure to do this.
5725A Instruction Manual Switching Section 4-18. MOSFETs Q301/Q317 and Q302/Q318 (each in parallel) are series-switch elements for the +400V supply. Similarly, Q312/Q319 and Q313/Q320 are series-switch elements for the -400V supply. Resistor pairs R301/R302 and R342/R343 equalize the voltage across the transistors in their "off" state. Series transistors guarantee operation within the MOSFET 500V absolute rating. The MOSFET switches are controlled by the signal at TP305.
Theory of Operation Detailed Circuit Description Current-Limit Section 4 4-19. Resistors R313 and R329 are current shunts for the high voltage supplies. These are connected in series with the bridge rectifiers, with the common point between the shunts being the high voltage supply common, HVCOM. The voltage developed across the +400V shunt is negative; the voltage across the -400V shunt is positive.
5725A Instruction Manual Fan Supply Section 4-21. The fan supply uses the same transformer secondary windings as the ±15 and ±20V supplies. Its own full-wave bridge rectifier diodes create a supply voltage of +25V. Transistor Q351 is operated near saturation, and provides the measurement point to tell the CPU whether the fan is running. The output of Q351 is sent to the analog multiplexer on line -FAN to accomplish this. Digital Assembly (A5) 4-22.
Theory of Operation Detailed Circuit Description 4 aq19f.eps Figure 4-2.
5725A Instruction Manual EEROM 4-26. A 2Kb X 8 EEROM (U512) stores 5725A calibration constants plus the date and temperature of calibration. If the rear panel CALIBRATION switch is in the NORMAL position, the EEROM is software write disabled. The 6303Y reads the CALIBRATION switch via bit 1 of port 5 and enables the EEROM when the switch is in the ENABLE position. The EEROM is selected when A15 and A14 are low, A13 is high (2000 through 3FFF), and either RD* or WR* is TRUE.
Theory of Operation Detailed Circuit Description Break-Detect Circuitry 4 4-31. The 6303Y divides the 4.9152-MHz crystal frequency by four to create the 1.2288-MHz ECLK. This signal serves as the clock for the 74HC4020 counter (U506), which is configured as a divide-by-16384. The RECEIVE line is usually high, except for the brief interval when characters are being transmitted. As long as the low state is less than 13.34 ms, RECEIVE holds the CLR of the 74HC4020 TRUE.
5725A Instruction Manual aq20f.eps Figure 4-3.
Theory of Operation Detailed Circuit Description • 4 Error Amplifier Section The error amplifier section contains three differential amplifiers and a precision high-current shunt resistor. Two differential amplifiers set the gain and uncorrected frequency response of the current amplifier. The remaining differential amplifier is used during the internal portion of 5700A/5725A calibration and during ac current operation.
5725A Instruction Manual (ICAL, TP208) with the same amplitude and polarity as the current amplifier input voltage. The calibration amplifier output is measured by circuitry within the 5700A during calibration of the 5725A current amplifier. The calibration amplifier output is fed back to the 5700A Oscillator during ac current operation. The feedback signal from the precision shunt is applied to both the inner and outer loop error amplifiers (ISENSE HI, ISENSE LO , pages 1 and 2).
Theory of Operation Detailed Circuit Description Control and Switching Section 4 4-38. Refer to page 2 of the Current Amplifier schematic. Relays K201 through 209, Q214 through 216, and U209 through 210 configure the Current Amplifier circuitry for the following six modes: • Current Standby Current Amplifier input is active through K201. Current Amplifier output is disconnected from instrument output terminals but is routed through the sense path through K202.
5725A Instruction Manual High Voltage Amplifier (A3) 4-40. The High Voltage Amplifier assembly, operating with the step-up signal transformers, constitutes an amplifier with an inverting gain of 100. It amplifies 2.2V to 11V signals from the 5700A Oscillator and returns 220V to 1100V to the 5700A where they go to the 5700A OUTPUT HI/OUTPUT LO binding posts. The signals to and from the 5700A come through the High Voltage Sense assembly (A6) where they are switched.
Theory of Operation Detailed Circuit Description 4 aq22f.eps Figure 4-4.
5725A Instruction Manual Integrator 4-42. Op amp U601A is configured as an integrator to reduce the output offset of the input amplifier circuit. This integrator senses the output voltage of the amplifier (MVOUT) through R604 and R605 and forces it to be zero with respect to HVCOMM. Window Comparator 4-43. Comparators U604A and U604B form a window comparator that monitors the output of the input amplifier, U602. The window is set to about +2.2V to +9V by R626, VR602, and R636.
Theory of Operation Detailed Circuit Description Transconductance and Cascode Stage 4 4-45. The output voltage of the input amplifier U602, LVAMP, is transformed into a current by Q602. The nominal current is about 8.5 mA. This implies that the nominal output voltage of the input amplifier is about 6V; 15V - (.0085 * 1000) - .6 = 5.9V. The current is passed through a cascode FET Q661, which can stand off the voltage required, about 400V.
5725A Instruction Manual compensate for the capacitance seen at the gates of the power MOSFETs on the #1 heat sink assemblies. Their sources establish the voltage on the gates of the cascode FETs in the midstage, Q654 and Q662. The power MOSFETs are in the TO3 package and are mounted to the heat sinks using a heat conductive pad (electrically conductive as well) to minimize thermal resistance to the heat sink. This means that the heat sinks can have ±400V on them during normal operation.
Theory of Operation Detailed Circuit Description 4 Op amp U606B senses the -400V supply and forces the autobias to the minimum bias condition when the ±400V supplies are turned off. Transistor Q606 forces the minimum bias condition when the window comparator is activated. High Voltage Amplifier Feedback 4-51. Feedback for the High Voltage Amplifier is provided by R606, R607, and R608 from the output signal MVOUT.
5725A Instruction Manual to approximately 33Ω/°C by R615. Op amp U603A provides a reference voltage of about -0.77V. This reference voltage is applied to the circuit containing summing amplifier U603B, R611, and the linearized thermistor. The output of U603B is signal HV TEMP M, equal to 10 mV/°C. A voltage proportional to the temperature rise from the heat sink to the junction of the transistor is added to HV TEMP M through R610. This is done via +400V IM from the Power Supply assembly.
Theory of Operation Detailed Circuit Description 4 aq21f.eps Figure 4-5.
5725A Instruction Manual • Serial Interface/Guard Crossing Section The serial interface/guard crossing section consists of an RS-232 interface integrated circuit that provides the hardware for 5700A/5725A communication within the 5725A. Two optoisolators provide the serial guard crossing to the Digital assembly (A5), and two more provide integrity checks for the interface.
Theory of Operation Detailed Circuit Description 4 VR105 reduce apparent supply voltage seen by U102. Transistors Q105 and Q106 along with R131/C117 and R132/C118 filter the supply to reduce common mode errors at high frequency. Capacitor C108 provides ac tuning for the sense amplifier. This capacitor balances most of the parasitic capacitance picked up across the input resistor portion of Z100. Capacitor C109, in parallel, provides fine adjustment of response if needed.
5725A Instruction Manual latch up by eliminating positive feedback resulting from positive output voltages from U100. Op amp U105 is simply a low-noise inverting amplifier that scales the sensor output to 10 dB below the 5700A Oscillator output level. The output of the calibration circuit, AC/AC, goes to the 5700A during calibration through the analog monitor section. Analog Monitor Section 4-56.
Theory of Operation Detailed Circuit Description 4 IC U156 is a dac whose digital input is under microprocessor control via data latch U155. The +15V supply is the dac’s reference voltage. Op amp U153A acts as a currentto-voltage converter, providing outputs between 0V and -6.375V. The desired output for the analog monitor function ranges from -2.56V to +2.56V. Level shifting and scaling is accomplished by U153B, by summing the output of U153A and the reference voltage for U156.
5725A Instruction Manual Relays K102 and K103 provide switching that allows direct drive of the sense amplifier and its calibration circuitry by the 5700A. These switches are used only during calibration. Relays K105 and K109 are high voltage reed relays that provide output to the 5700A binding posts and remote sensing from the binding posts, respectively, during ac voltage operation.
Theory of Operation Detailed Circuit Description AC Line Voltage Selection Section 4 4-60. In addition to the primary power switch, S401, this section contains three line-voltage selection switches, S402 through S404. These three switches allow the 5725A to be set to eight nominal ac line voltage levels, each with a 10% tolerance. Thermistors RT401 and RT402 have negative temperature coefficients, and limit inrush current at power-up.
5725A Instruction Manual 4-38
Chapter 5 Calibration and Verification Title 5-1. 5-2. Page Introduction ............................................................................................ 5-3 Where to Find Further Information........................................................
5725A Instruction Manual 5-2
Calibration and Verification Introduction Introduction 5 5-1. The 5725A is calibrated at the factory before shipping. Calibration is traceable to the U.S. National Bureau of Standards. All that is required to maintain traceability is to run 5700A calibration to external standards at the beginning of the calibration cycle and do performance verification every two years. Calibration check and range calibration are optional procedures that are available for special needs.
5725A Instruction Manual 5-4
Chapter 6 Maintenance Title 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 6-8. 6-9. 6-10. 6-11. 6-12. 6-13. 6-14. 6-15. Introduction .......................................................................................... Replacing the Fuse ............................................................................... Cleaning the Air Filter.......................................................................... General Cleaning..................................................................................
5725A Instruction Manual 6-2
Maintenance Introduction 6 Warning Servicing described in this section is to be done by qualified service personnel only. To avoid electrical shock, do not service the 5725A unless you are qualified to do so. Introduction 6-1. This section explains how to do routine maintenance tasks and how to access internal modules for troubleshooting and repair.
5725A Instruction Manual WARNING GROUNDING CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING. CONNECTOR IN POWER CORD MUST BE CONNECTED TO ENSURE PROTECTION FROM ELECTRONIC SHOCK. VOLTAGE SELECTION 47-63 Hz 750VA MAX FUSE S2 S3 S4 ! FUSE 100V 110V 115V 120V ! F8A 250V (FAST) S2 S3 S4 200V 220V 230V 240V JOHN FLUKE MFG. CO., INC. MADE IN U.S.A.
Maintenance General Cleaning 6 aq14f.eps Figure 6-2. Accessing the Air Filter General Cleaning 6-4. To keep the 5725A looking like new, clean the case, front panel, and rear panel using a soft cloth slightly dampened with water or a non-abrasive mild cleaning solution that does not harm plastics. Caution Do not use aromatic hydrocarbons or chlorinated solvents for cleaning. They can damage the plastic materials used in the amplifier. Cleaning PCA’s 6-5.
5725A Instruction Manual Access Procedures 6-6. Figure 6-3 shows the location of all major modules in the 5725A. View A is a top view, and view B is a bottom view. Both views show the covers removed. The 5725A is constructed so that two modules are completely accessible from the top, and two modules are completely accessible from the bottom.
Maintenance Access Procedures 6 wWarning Follow the instructions under "Initial Access Procedure" to make sure high voltage has been bled off before you touch anything inside the 5725A. If you work on a 5725A with the power cord attached, and/or you are not certain the high voltage has not bled off, do not wear a grounded wrist strap. Wearing a strap increases risk of dangerous electrical shock. Use extreme caution when you are working inside the 5725A with the power connected.
5725A Instruction Manual HIGH VOLTAGE AMPLIFIER (A3) LED CR317 TP307 LED CR318 TP304 TP301 ER W PO DE MO T Y EN DB RR AN CU ST A 25 57 T UL AD LO ER FF OV E O BL CA FA FRONT PANEL A 11 X MA V 2O PKX MA POWER SUPPLY (A4) aq16f.eps Figure 6-4. Initial Access Procedure 6. Verify that both LEDs CR317 and CR318 on the Power Supply assembly (A4) are off. If either is lit after three minutes, there is a fault in the high voltage capacitor bleed-off path.
Maintenance Access Procedures 6 8. Take another DMM reading with the common lead to TP307 and the high lead to TP304 on the Power Supply assembly. This is the -400V filter capacitor test point, and it should be at a safe level near zero. This completes the initial access procedure. Accessing the Power Supply Assembly (A4) 6-8.
5725A Instruction Manual CAUTION WHEN REINSTALLING DIGITAL ASSEMBLY, PULL RIBBON CABLE SLACK COMPLETELY INTO CHASSIS. aq17f.eps Figure 6-5.
Maintenance Access Procedures 6 4. If you want to completely remove the Digital assembly, remove the ribbon cable by releasing the catches on the board-mounted connector. Caution When replacing the Digital assembly, make sure the ribbon cable is pulled fully into the 5725A chassis. Be sure to leave no fold trapped between the back of the pca and the metal panel or else shorting to the component leads can occur. Accessing the Current Amplifier Assembly (A2) 6-10.
5725A Instruction Manual CURRENT AMPLIFIER (A2) BRIDGE RECTIFIER HEAT SINK DRESS CABLES AS SHOWN aq18f.eps Figure 6-6. Correct Way to Dress Cables Accessing the High Voltage Amplifier (A3) 6-11. The High Voltage Amplifier assembly lays flat on the top of the instrument, toward the rear. To access the High Voltage Amplifier assembly, simply do the Initial Access Procedure. This leaves the assembly in the service position.
Maintenance Access Procedures Accessing the High Voltage Sense Assembly (A6) 6 6-12. Warning To avoid electrical shock, do not proceed with the following access procedure until you have completed the initial access procedure, which removes line power and checks for high voltage on the power supply. Line voltage comes directly to this assembly. The High Voltage Sense assembly lays flat on the top of the instrument, toward the rear. Proceed as follows to access the High Voltage Sense assembly: 1.
5725A Instruction Manual Accessing the High Voltage Output Transistors 6-13. Warning During normal operation, the high voltage heat sinks are at lethal voltage. To avoid electrical shock, do not proceed with the following access procedure until you have completed the initial access procedure, which removes line power and checks for high voltage on the power supply.
Maintenance Enabling Front or Rear Binding Posts 6 6. Turn over the 5725A so that the top is facing up. 7. Remove the high voltage heat sink assembly as described under “Accessing the High Voltage Output Transistors", steps 2 through 4. 8. Remove the two screws that secure the Interconnect assembly and pop the assembly free of the two bosses. Enabling Front or Rear Binding Posts 6-15.
5725A Instruction Manual FRONT OUTPUT CABLE J222 SECURE UNUSED CABLE CURRENT AMPLIFIER (A2) REAR OUTPUT CABLE aq23f.eps Figure 6-7. Enabling Front or Rear Binding Posts Caution Make sure that the unused connector is neatly secured in the recessed area of the chassis side, away from the High Voltage Sense assembly as Figure 6-7 shows. If it is allowed to hang down, shorting can occur. 8. Reconfiguration is complete.
Chapter 7 Troubleshooting Title 7-1. 7-2. 7-3. 7-4. 7-5. 7-6. 7-7. 7-8. 7-9. 7-10. Introduction .......................................................................................... 5725A Fault Codes............................................................................... Self Diagnostics.................................................................................... Manual Tests for Fault Isolation ..........................................................
5725A Instruction Manual 7-2
Troubleshooting Introduction Introduction 7 7-1. This section provides troubleshooting information in three parts. First a listing of all 5725A fault codes is provided for reference in Table 7-1. Following that is a description of 5725A automated self-diagnostics that you run from the 5700A. Finally, some manual tests are provided that can help you isolate a fault. 5725A Fault Codes 7-2. Table 7-1 lists all 5725A fault codes.
5725A Instruction Manual Table 7-1. 5725A Fault Codes FAULT NO.
Troubleshooting Self Diagnostics 7 Table 7-1. 5725A Fault Codes (cont) FAULT NO.
5725A Instruction Manual Manual Tests for Fault Isolation 7-4. Warning The following servicing is to be done by qualified service personnel only. To avoid electrical shock, do not service the 5725A unless you are qualified to do so. Follow the access procedures and warnings in section 6 to open the 5725A covers. The voltage output transistor heat sinks are at lethal voltage potential in ac v standby and ac v operate modes during normal operation, and possibly in any other mode after a failure.
Troubleshooting Manual Tests for Fault Isolation 7 Problems 1 or 2: Fault at Power-Up or When Entering Voltage Standby 7-5. Proceed as follows to isolate the problem in these conditions: 1. If the 5700A is reporting a fault, determine if it is an analog monitor fault from Table 7-2. If the fault is not in Table 7-2, skip to step 2. (See Table 7-1 for explanations of fault codes.) Table 7-2. Analog Monitor Faults FAULT NO.
5725A Instruction Manual Problem 3: Fault When Entering Voltage Operate 7-6. Proceed as follows to isolate the problem in this condition: 1. Suspect the 5700A/5725A interface cable. 2. Check the analog monitor circuit on the High Voltage Sense Assembly as in step 1 on conditions 1 and 2. 3. Suspect the High Voltage Amplifier assembly and the output transistor heat sink assemblies. Problem 4: Fault When Entering Current Standby 7-7. Proceed as follows to isolate a problem in this condition: 1.
Troubleshooting Testing the Power Supply By Itself 7 3. Remove plug P301 from J301 and inserting it into J303. Now the high voltage power supply will power up in the ±50V mode. The high voltage amplifier may also be serviced in the ±50V mode. Testing the Power Supply By Itself 7-10. To turn on a Power Supply assembly (A4) by itself for troubleshooting, proceed as follows: 1. Turn off the POWER switch and disconnect the line power cord from ac line power.
5725A Instruction Manual 7-10
Chapter 8 List of Replaceable Parts Title 8-1. 8-2. 8-3. 8-4. 8-5 Introduction .......................................................................................... How to Obtain Parts ............................................................................. Manual Status Information................................................................... Newer Instruments................................................................................ Service Centers...................................
5725A Instruction Manual 8-2
List of Replaceable Parts Introduction 8 8-1. This chapter contains an illustrated list of replaceable parts for the 7-300, 7-600, 12B, and 18 Meters. 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.
5725A Instruction Manual Service Centers 8-5. A list of service centers is located at the end of this section. Note This instrument may contain a Nickel-Cadmium battery. Do not mix with the sold waste stream. Spent batteries should be disposed of by a qualified recycler or hazardous materials handler. Contact your authorized Fluke service center for recycling information. Manual Status Information Ref or Option No. Assembly Name Fluke Part No.
List of Replaceable Parts 8 Table 8-1. Final Assembly (cont) Reference Designator Description Fluke Stock No Tot Qty H437 SCREW,PH,P,LOCK,SS,6-32,.750 376822 2 H439 SCREW,TH,P,LOCK,STL,8-32,.250 853622 4 H443 SCREW,PH,P,LOCK,STL,6-32,.625 152181 4 H505 NUT,HEX,BR,1/4-28 110619 1 H506 WASHER,LOCK,INTRNL,STL,.267ID 110817 1 H513 WASHER,FLAT,SS,.119,.187,.010 853296 2 H545 NUT,EXT LOCK,STL,6-32,.344OD 152819 1 L3-6 CORE,TOROID,FERRITE,.047X.
5725A Instruction Manual aq24f.tif Figure 8-1.
List of Replaceable Parts 8 aq25f.tif Figure 8-1.
5725A Instruction Manual aq26f.tif Figure 8-1.
List of Replaceable Parts 8 aq27f.tif Figure 8-1.
5725A Instruction Manual aq28f.tif Figure 8-1.
List of Replaceable Parts 8 aq29f.tif Figure 8-1.
5725A Instruction Manual aq30f.tif Figure 8-1.
List of Replaceable Parts 8 aq31f.tif Figure 8-1.
5725A Instruction Manual Table 8-2. A1 Interconnect PCA Reference Designator CR1,CR13-15 8-14 Description * DIODE,SI,BV=75V,IO=150MA,500MW Fluke Stock No Tot Qty 203323 4 H13 RIVET,S-TUB,OVAL,AL,.087,.343 838458 8 H22 RIVET,S-TUB,OVAL,STL,.118,.218 103606 4 J1 HEADER,2 ROW,.100CTR,34 PIN 836577 1 J2 HEADER,1 ROW,.156CTR,10 PIN 446724 1 J100,J103 HEADER,1 ROW,.
List of Replaceable Parts 8 5725A-1611 aq36f.eps Figure 8-2.
5725A Instruction Manual Table 8-3. A2 Current Amplifier PCA Reference Designator Description C201,C202,C207, CAP,AL,22UF,+-20%,35V Tot Qty 817056 9 C208,C211,C212, 817056 C226,C227,C236 817056 C203,C204,C216, CAP,POLYES,0.1UF,+-10%,50V C217,C238-240 649913 7 649913 C205,C206 CAP,POLYES,0.001UF,+-10%,50V 720938 2 C210,C214,C215, CAP,POLYES,0.
List of Replaceable Parts 8 Table 8-3. A2 Current Amplifier PCA (cont) Fluke Stock No Tot Qty INSULATOR, CURRENT 880716 1 MP38 FOOT,RUBBER,ADHES,GRY,.44 DIA, 358341 1 MP81 CLAMP,PWB MOUNTING 823039 1 MP82 CLAMP,PWB MOUNTING 842948 1 MP203 HEAT DIS,PRESS ON,TO-5 418384 2 MP205 HEAT DIS,VERT,.83,.50,.395,TO- 800144 1 MP206 HEAT DIS,ACC,AL FOIL,TO-3 838169 2 MP211 FUSE CLIP PCB 756460 4 MP215 SOCKET,SINGLE,PWB,FOR .042-.
5725A Instruction Manual Table 8-3. A2 Current Amplifier PCA (cont) Reference Designator Description R233,R237,R238, RES,MF,2K,+-1%,0.125W,100PPM R273 Tot Qty 235226 4 235226 R243,R244 RES,CF,100K,+-5%,0.25W 348920 2 R247,R248 RES,MF,232,+-1%,0.125W,100PPM 289975 2 R253,R277,R282, RES,MF,10K,+-1%,0.125W,100PPM 168260 6 R283,R285,R286 168260 R255,R267,R268 RES,CF,470K,+-5%,0.25W 342634 3 R256-259 RES,MF,1M,+-1%,0.125W,100PPM 268797 4 R260 RES,CC,5.1,+-5%,0.
List of Replaceable Parts 8 5725A-1650 aq37f.eps Figure 8-3.
5725A Instruction Manual Table 8-4. A3 High Voltage Amplifier PCA Reference Designator Description C601 CAP,POLYES,1UF,+-10%,50V Tot Qty 733089 1 C602 CAP,CER,100PF,+-5%,50V,C0G 831495 1 C603,C606,C609- CAP,AL,10UF,+-20%,63V,SOLV PRO 816843 6 611,C620 816843 C604,C605 CAP,CER,1.5PF,+-0.25PF,1000V,C 836346 2 C607,C614,C654, CAP,CER,22PF,+-10%,1000V,C0G 817023 4 C662 817023 C608,C612,C619, CAP,POLYES,0.
List of Replaceable Parts 8 Table 8-4. A3 High Voltage Amplifier PCA (cont) Reference Designator Description Fluke Stock No Tot Qty 110569 5 MP668 NUT,HEX,MINI,SS,6-32 MP674 WASHER,FLAT,STL,.149,.375,.031 110270 5 MP679 SCREW,PH,P,SEMS,STL,6-32,.313 530287 5 Q601 * TRANSISTOR,SI,N-JFET,TO-92 816314 1 Q602,Q603,Q606 * TRANSISTOR,SI,PNP,40V,0.
5725A Instruction Manual Table 8-4. A3 High Voltage Amplifier PCA (cont) Reference Designator Description Tot Qty 348920 2 R640,R642 RES,CF,100K,+-5%,0.25W R641,R648 RES,MF,10K,+-1%,0.125W,100PPM 168260 2 R643 RES,CF,4.7M,+-5%,0.25W 543355 1 R647 RES,MF,20K,+-1%,0.125W,100PPM 291872 1 R651 RES,CC,220,+-10%,1W 109462 1 R654,R661,R684, RES,CC,100K,+-5%,1W 641282 4 R692 641282 R657,R658,R666, 8-22 Fluke Stock No RES,CC,3.
List of Replaceable Parts 8 5725A-1661 aq38f.eps Figure 8-4.
5725A Instruction Manual Table 8-5. A4 Power Supply PCA Reference Designator Description C301,C302,C321, CAP,AL,220UF,+-20%,350V C322 Tot Qty 854075 4 854075 C303,C304,C308, CAP,POLYES,0.1UF,+-10%,50V 649913 C317-319,C352, 649913 C355,C358,C360, 649913 C362 11 649913 C305,C306 CAP,AL,0.47UF,+-20%,50V 769695 C307 CAP,POLYES,0.047UF,+-10%,50V 820548 1 C309 CAP,CER,82PF,+-2%,50V,C0G 714857 1 C310,C311,C313, CAP,CER,0.
List of Replaceable Parts 8 Table 8-5. A4 Power Supply PCA (cont) Reference Designator Description Fluke Stock No Tot Qty MP310 AIDE,PCB PULL 541730 2 MP350 HEAT DIS,VERT,1.13X1.90X0.95,T 830844 3 MP398 PAD, ADHESIVE 735365 2 JUMPER,REC,2 POS,.100CTR,.025 530253 1 TRANSISTOR,SI,P-MOS,POWER,500V 782482 4 P301 Q301,Q302,Q317, * Q318 * Q303-305,Q315, * Q321,Q322 * Q306,Q307,Q311, * Q316,Q323,Q324 * Q308 * TRANSISTOR,SI,PNP,40V,0.
5725A Instruction Manual Table 8-5. A4 Power Supply PCA (cont) Fluke Stock No Tot Qty RES,CF,1K,+-5%,0.25W 343426 1 R355 RES,CF,4.7K,+-5%,0.25W 348821 1 R361,R362 RES,CF,4.7,+-5%,0.25W 441584 2 RT350 THERMISTOR,DISC,O.12,25C 838144 1 RT351-354 THERMISTOR,DISC,0.81,25C 838136 4 SW301,SW302 SWITCH,PUSHBUTTON,SPST,MOMENTA 782656 2 TP301-307,TP350- JUMPER,WIRE,NONINSUL,0.
List of Replaceable Parts 8 5725A-1631 aq39f.eps Figure 8-5.
5725A Instruction Manual Table 8-6. A5 Digital PCA Reference Designator Description C501,C503-511, CAP,POLYES,0.1UF,+-10%,50V C516,C518,C519, Tot Qty 649913 14 649913 C521 649913 C502,C520 CAP,AL,22UF,+-20%,35V 817056 2 C512,C513 C514,C517 CAP,CER,15PF,+-20%,50V,C0G 697524 2 CAP,POLYES,0.33UF,+-10%,50V 715284 2 C515 CAP,TA,10UF,+-20%,35V 816512 1 C522-530 CAP,CER,470PF,+-5%,50V,C0G 830430 9 C531 CAP,CER,100PF,+-5%,50V,C0G 831495 1 CR501,CR504, LED,GREEN,LIGHT BAR,5.
List of Replaceable Parts 8 5725A-1650 aq40f.eps Figure 8-6.
5725A Instruction Manual Table 8-7. A6 High Voltage Sense PCA Reference Designator Description Tot Qty C100,C121 CAP,POLYCA,1UF,+-10%,50V 271619 2 C101,C103,C106, CAP,POLYES,0.1UF,+-10%,50V 649913 32 C107,C109,C111, 649913 C114,C115 C117- 649913 119,C124,C125, 649913 C150-152,C154, 649913 C157,C163,C166, 649913 C167,C169-176, 649913 C181-183 649913 C102 CAP,POLYCA,0.15UF,+-5%,50V 343616 1 C104,C127 CAP,CER,680PF,+-5%,50V,C0G 743351 2 C105 CAP,PORC,1.0PF,+-0.
List of Replaceable Parts 8 Table 8-7. A6 High Voltage Sense PCA (cont) Reference Designator Description J403 HEADER,1 ROW,.156CTR,RT ANG,5 K101,K106-108, RELAY,ARMATURE,2 FORM C,5V K111,K151-153 Fluke Stock No Tot Qty 844717 1 733063 8 733063 K102-105,K109 RELAY,REED,1 FORM A,5VDC 806950 5 K401 RELAY,ARMATURE,2 FORM A,5VDC 830547 1 L100-105 CHOKE, 3 TURN 452888 6 MP1 CABLE ACCESS,TIE,4.00L,.10W,.
5725A Instruction Manual Table 8-7. A6 High Voltage Sense PCA (cont) Reference Designator Description R154 RES,MF,20K,+-0.1%,0.25W,25PPM Tot Qty 810564 1 R155 RES,MF,13.7K,+-0.1%,0.125W,25P 851340 1 R156,R158,R168, RES,CF,3.9K.+-5%,0.25W 810416 4 R173 810416 R162 RES,CF,10K,+-5%,0.25W 697102 1 R171 RES,CF,3M,+-5%,0.25W 746172 1 R172,R175 RES,CF,4.7K,+-5%,0.25W 721571 2 R178 RES,CF,2K,+-5%,0.25W 810457 1 R401 RES,MF,6.19K,+-1%,0.
List of Replaceable Parts 8 5725A-1601 aq41f.eps Figure 8-7.
5725A Instruction Manual Table 8-8. A12 Transformer Enclosure Assembly Reference Designator 8-34 Description Fluke Stock No Tot Qty H1 SCREW,FHU,P,LOCK,SS,6-32,.250 320093 4 H5 SCREW,PH,P,LOCK,MAG SS,6-32,.2 772236 20 H39 SCREW,PH,P,LOCK,STL,6-32,.625 152181 2 H41 SCREW,PH,P,LOCK,SS,4-40,.187 149567 2 H43 SCREW,PH,P,LOCK,SS,6-32,.500 320051 1 H44 SCREW,PH,P,LOCK,STL,6-32,.750 114223 5 H49 WASHER,FLAT,STL,.149,.375,.031 110270 2 H51 SCREW,HH,H,LOCK,STL,10-32,.
List of Replaceable Parts 8 aq32f.tif Figure 8-8.
5725A Instruction Manual aq33f.tif Figure 8-8.
List of Replaceable Parts 8 aq34f.tif Figure 8-8.
5725A Instruction Manual aq35f.tif Figure 8-8.
List of Replaceable Parts 8 Table 8-9. A30 Inductor PCA Reference Designator J1 Description CONN,MATE-N-LOK,HEADER,4 PIN Fluke Stock No Tot Qty 512269 1 L1,L2 CHOKE 490888 2 W1 HARNESS, LINE VOLTAGE 843011 1 Notes 1. For schematic, See A6 section 9. 5725A-1603 aq42f.eps Figure 8-9.
5725A Instruction Manual 8-40
Chapter 9 Schematic Diagrams Figure No. 9-1. 9-2. 9-3. 9-4. 9-5. 9-6. 9-7. Title Page A1 Interconnect PCA ........................................................................ 9-3 A2 Current Amplifier PCA ............................................................... 9-6 A3 High Voltage Amplifier PCA...................................................... 9-10 A4 Power Supply PCA...................................................................... 9-13 A5 Digital PCA ................................
5725A Instruction Manual 9-2
Schematic Diagrams 9 aq48f.eps 5725A-1611 Figure 9-1.
5725A Instruction Manual Figure 9-1.
Schematic Diagrams 9 Figure 9-1.
5725A Instruction Manual aq52f.eps 5725A-1650 Figure 9-2.
Schematic Diagrams 9 Figure 9-2.
5725A Instruction Manual Figure 9-2.
Schematic Diagrams 9 Figure 9-2.
5725A Instruction Manual aq56f.eps 5725A-1661 Figure 9-3.
Schematic Diagrams 9 Figure 9-3.
5725A Instruction Manual Figure 9-3.
Schematic Diagrams 9 aq59f.eps 5725A-1631 Figure 9-4.
5725A Instruction Manual Figure 9-4.
Schematic Diagrams 9 Figure 9-4.
5725A Instruction Manual aq62f.eps TYPICAL COMMUNICATIONS ACTIVITY AT PINS 12 AND 13 OF U507. 5725A-1650 100 90 10 2V 0 10 ms aq43f.eps Figure 9-5.
Schematic Diagrams 9 Figure 9-5.
5725A Instruction Manual aq63f.eps A VOLTAGE STANDBY STANDBY 100 100 100 90 90 90 10 10 1V CURRENT STANDBY 1V 0 5725A-1601 10 1V 0 0 aq44f.eps 10 ms 10 ms 10 ms Figure 9-6.
Schematic Diagrams 9 Figure 9-6.
5725A Instruction Manual Figure 9-6.
Schematic Diagrams 9 Figure 9-6.
5725A Instruction Manual Figure 9-6.
Schematic Diagrams 9 aq45f.eps Figure 9-7.
5725A Instruction Manual 9-24
Index —5— 5700A CALIBRATOR connector, 2-6, 3-7 Connecting to, 2-6 5725A STANDBY indicator, 3-5 Input clamp, 4-26 Integrator, 4-26 Midstage, 4-27 Midstage -400V filter, 4-27 Signal transformers, 4-29 Temperature monitoring, 4-29 Transconductance and cascode stage, 4-27 Window comparator, 4-26 —A— A1. See Interconnect assembly A2. See Current Amplifier assembly A3. See High Voltage Amplifier assembly A4. See Power Supply assembly A5. See Digital assembly A6. See High Voltage Sense assembly AC current.
5725A Instruction Manual PCAs, 6-5 Clearance requirements, 2-5 Communication, 5700A and 5725A, 4-8 Connectors, (also see binding posts, terminals), 3-5 5700A CALIBRATOR, 2-6, 3-7 Line power, 3-7 Controls. See switches Cooling considerations, 2-5 Cord, line power, 2-4, 2-9 Current Output, 3-5, 3-7 Standby, 3-11, 4-7 Current Amplifier assembly (A2), 4-19 Access procedure, 6-11 Block diagram, 4-20 Theory of operation, 4-19 CURRENT MODE indicator, 3-5 CURRENT OUTPUT binding posts, 3-5, 3-7 —D— DC current.
Index (continued) POWER switch, 3-5 Problems, 2-5, 7-3 —R— Rack mounting, 2-5 Rear panel features, 3-6 Remote control, 3-3 Replacing the fuse, 6-3 —S— Selecting line voltage, 2-7 Self diagnostics, 7-3 Service information, 2-5 Setting the output, 3-3 Setting up, 2-3 Signal transformer usage (High Voltage Amplifier), 4-29 Specifications, 1-7 Standard equipment, 2-3 Standby mode, 3-9, 4-7 Current standby mode, 3-11, 4-7 Voltage standby mode, 3-10, 4-7 Switches CALIBRATION, 3-7 Line voltage selection, 2-7, 3
5725A Instruction Manual 4
Manual Supplement Manual Title: Part Number: Print Date: Revision/Date: 5725A 823435 January 1989 6, 6/96 Supplement Issue: Issue Date: Page Count: 1 6/96 1 This supplement contains information necessary to ensure the accuracy of the above manual. Enter the corrections in the manual if either one of the following conditions exist: 1. 2. The revision letter stamped on the indicated PCA is equal to or higher than that given with each change. No revision letter is indicated at the beginning of the change.
5725A Manual Supplement Change #1 On page 6-8, replace the first sentence in the Warning with the last sentence in step 6. On page 6-9, paragraph 6-8, replace step 2 with: 2. Return the High Voltage Amplifier assembly (A3) (and the Current Amplifier assembly (A2) if it has been accessed) to the normal position, and reinstall the assembly retaining screws.