SERVICE MANUAL AC Power Source/Analyzer Agilent Models 6814B and 6834B Regulatory Test Solution (RTS) - formerly called the Harmonic/Flicker Test System (HFTS) Agilent Model 6843A For instruments with Serial Numbers: Model 6814B: 3601A-00101 through 00272 US36010273 and up Model 6834B: 3601A-00101 through 00403 US36010404 and up Model 6843A: 3531A-00101 through 00256 US35310257 and up Agilent Part No. 5962-0891 Microfiche Part No.
CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International Standards Organization members.
SAFETY CONSIDERATIONS GENERAL. This is a Safety Class 1 instrument (provided with terminal for connection to protective earth ground). OPERATION. BEFORE APPLYING POWER verify that the product is set to match the available line voltage, the correct line fuse is installed, and all safety precautions (see following warnings) are taken. In addition, note the instrument's external markings described under "Safety Symbols". WARNING. • Servicing instructions are for use by service-trained personnel.
Printing History The current edition of this manual is indicated below. Reprints of this manual containing minor corrections and updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition incorporates all new or corrected material since the previous printing date. Changes to the manual occurring between revisions are covered by change sheets shipped with the manual. In some cases, the manual change applies only to specific instruments.
Table of Contents 1. Introduction Scope ............................................................................................................................................................7 Organization ..............................................................................................................................................7 Safety Considerations ...................................................................................................................................
Table of Contents (continued) 6. Diagrams Introduction ................................................................................................................................................37 General Schematic Notes............................................................................................................................37 Index...............................................................................................................................................
1 Introduction Scope Organization This manual contains information for troubleshooting and repairing to the component level Agilent Model 6814B, 6834B AC Power Source/Analyzers and Agilent Model 6843A Regulatory Test Solution, hereafter referred to as an AC Power Source. The manual applies to both standard units and units that have Option 400.
Note 1) If the serial prefix of your unit is higher than that shown in the title page then the unit was made after the publication of this manual and may have hardware and/or firmware differences not covered in this manual. If they are significant to the operation and/or servicing of the AC Power Source, those differences are documented in one or more Manual Change sheets included with this manual.
2 Performance Tests Introduction This chapter provides test procedures for checking the operation of an Agilent Model 6814B/6834B AC Power Source/Analyzer or Agilent Model 6843A RTS. The required test equipment is specified and sample performance test record sheets are included. Instructions are given for performing the tests using the front panel keypad. Test Equipment Required Table 2-1 lists the equipment required to perform the verification tests given in this chapter.
provided. Select an adequate gauge wire for load tests using the procedures given in the operating manual for connecting the load. Current-Monitoring Resistor To eliminate output current measurement error caused by voltage drops in the leads and connections, connect the current-monitoring resistor as a four terminal device. Performance Tests Performance tests check all the specifications of the ac source. The various tests are grouped under Table 2-2.
Step Table 2-2. ( Continued ) CV Load Effect Action Normal Result This test measures the change in output voltage resulting from a change in output current from full-load to no-load or no-load to full-load. Turn off ac source. Connect DVM across output terminals ( or 1 ratio transformer if used ) and 7.5 ohm for Agilent 6814B, 15 ohm for 6834B or 5 ohms for 6843A load resistors as shown in Test Setup Figure 2-1. Turn on ac source.
Table 2-2. ( Continued ) rms Current Accuracy Test Action Normal Result Step 1 2 3 4 This test verifies the measurement accuracy of the rms current readback. Turn off ac source. Connect Current Shunt, 7.5 ohm for Agilent 6814B, 15 ohm for Agilent 6834B or 5 ohm for Agilent6843A load resistors and DVM as shown in Test Setup Figure 2- 2. Turn on ac source. Press [Shift] [Output] display reads *RST *RST resets ac source to known factory default state. press [Enter].
Table 2-3 Performance Test Record Form Test Facility: __________________________________________ __________________________________________ __________________________________________ __________________________________________ Report No.
Table 2-4. Performance Test Record - Agilent 6814B AC Power Source Model: Agilent 6814B Report No.: Date: Test Description Min Spec Results Max Spec Meas Uncert ** High Range@ 45 Hertz Program 300V Front Panel Display 299.250 Vrms-400mV ______V ______V 300.750 Vrms+400mV 140mV ( 1.2mV ) High Range@ 400 Hertz Program 300V Front Panel Display 298.200 Vrms-400mV ______V ______V 301.800 Vrms+400mV 140mV ( 1.2mV ) High Range@ 1000 Hertz Program 300V Front Panel Display 296.
Table 2-4. (Continued) Performance Test Record – Agilent 6834B AC Power Source Model: Agilent 6843B Report No.: Date: Test Description Min Spec Results Max Spec Meas Uncert ** High Range@ 45 Hertz Program 300V Front Panel Display 299.250 Vrms-400mV ______V ______V 300.750 Vrms+400mV 140mV ( 1.2mV ) High Range@ 400 Hertz Program 300V Front Panel Display 298.200 Vrms-400mV ______V ______V 301.800 Vrms+400mV 140mV ( 1.2mV ) High Range@ 1000 Hertz Program 300V Front Panel Display 296.
Table 2-4. Performance Test Record - Agilent 6843A AC Power Source Model: Agilent 6843A Report No.: Date: Test Description Min Spec Results Max Spec Meas Uncert ** High Range@ 45 Hertz Program 300V Front Panel Display 299.250 Vrms-400mV ______V ______V 300.750 Vrms+400mV 140mV ( 1.2mV ) High Range@ 400 Hertz Program 300V Front Panel Display 298.200 Vrms-400mV ______V ______V 301.800 Vrms+400mV 140mV ( 1.2mV ) High Range@ 1000 Hertz Program 300V Front Panel Display 296.
HP3458A DMM 1 30 NOTE: Be sure to move sense lead to phase under test or connect sense leads to all three phases.
HP3458A DMM SENSE S1 Rl Rs COM O3 O2 O1 6834B O1 O2 O3 COM L3 L1 L2 AC INPUT 3 phase 180-254 VAC line to line Rl = 60 OHM @ 300V OUTPUT >1500W or 15 OHM @ 150V OUTPUT >1500W 360-440 VAC line to line Rs = Current Monitor resistor - move for testing current in phase 2 & 3 TEST SETUP for 6834B HP3458A DMM NOTE: Sense lead connections reversed on 6843A Rl Rs SENSE S1 COM O1 O1 6814B or 6843A COM L1 L2 L3 Rl = 7.
3 Troubleshooting Shock Hazard. The troubleshooting procedure in this chapter must be performed with power applied and protective covers removed. These procedures should be done only by trained service personnel aware of the hazard from electrical shock. This instrument uses components that can be damaged or suffer serious performance degradation due to ESD ( electrostatic discharge ). Observe standard antistatic precautions to avoid damage to components ( see Chapter 1 ).
Firmware Revisions The model number and then the firmware revision is displayed on the front panel for approximately l0 seconds when unit is first turned on. The firrnware revision is also accessible via the GPIB using the *IDN? query. The following sample AgilentBASIC program does this. 10 ALLOCATE L$[52] 20 OUTPUT 705;"*IDN?" 30 ENTER 705;L$ 40 DISP L$ 50 END The computer will display the string "HEWLETT-PACKARD,,0,".
Calibration Configuration Switch An internal set of switches control access to calibration commands. The switches are located on the A8 DSP board and are accessible by removing the top cover. Switches 1 and 2 set the calibration configuration. The three positions are: Normal Cal This is the default switch position. The calibration functions are accessible after entering a numeric password. The default password is 0 and is changeable by the user.
Troubleshooting Hints 1. Read all troubleshooting instructions before attempting to troubleshoot the unit. 2. If the AC Power Source operates properly but does not deliver full output power capability, check the ac input mains fuses located on the rear panel. 3. The amplifiers, ( Al, A2, A3 ) may be interchanged in identical models for troubleshooting purposes. The Agilent 6814A, 6834A, and 6843A models Al, A2, A3 amplifiers cannot be used in the Agilent 6814B or 6834B models.
Table 3-3. AC Power Source Troubleshooting Procedures DANGER Lethal voltages are present when Instrument covers are removed. Step 1 Procedure Turn off ac mains, disconnect load, and configure unit for local sensing. 2 Turn on unit and verify that ac power is on by observing if front panel display is on and fans are on. 3 Turn off power supply and remove top cover as follows: Remove 9 screws from top and 3 screws from each side of unit. Lift cover straight up being careful of lip on front of cover.
Step 7 8 9 Table 3-3. AC Power Source Troubleshooting Procedures (continued) Procedure Indication Action Relays energize, fans are on, but no front Shift annuniciator on front Check +5Vhpib and +/-15V at A10J1, J2, J3. panel display. Press the [ Shift ] key a couple panel toggles. Check communication from of times. A8 DSP to A11 front panel. A8 DSP assembly may be defective. Check A4F1,F2,F3 Fuses 300 Vdc on Cl. Yes One or more outputs are missing.
One to outside end of C1 and the other to outside end of C3. ( outside end of capacitor is end toward edge of heatsink ) Note: See Switching Amplifier Balancing on page 22. Procedure is present at C1/C3 connections ( measure 100 Vrms with 300 Vrms programmed ) A1C1 and A1C3 A2C1 and A2C3 A3C1 and A3C3 With 100 Vrms programmed. Verify A4 mother board common mode choke continuity. See figure 6-13 for location of chokes.
Procedure Table 3-6. A10 Auxiliary Power Supply Troubleshooting Action See figures 6-7 and 6-8 for test points and schematic. Control Circuits 1. Apply 20 Vdc between TP7(+) and TP1(-). 2. Verify waveform at TP2 to TP1. 0 V to >15 V at approximately 60 kHz, duty cycle 40% to 50%. 3. Check drive to Ql and Q4 . Connect scope common to CR13 anode, verify waveform at gate drive resistors R10 and R28 is swinging between +12Vpk and –12Vpk at approximately 60 kHz, duty cycle 40 to 50%. Outputs 1.
Procedure Table 3-8. A4 Mother Board Troubleshooting Action See figure 6-13 for test points. Inputs The following voltage tests verify that the correct input operational voltages are available to the A4 mother board. To test for these voltages, remove the Al, A2 and A3 amplifier assemblies. The +300 Vdc and 300 Vdc return are shown on Fig 6-13. The following input voltages appear at J2, J4 and J6.
Figure 3-1.
Phase A U740-9 J722-5 J2-5 TP1 Remove A1 A2 A3 to access these connections A4 Mother Assembly A6 Servo Assembly A8 DSP Assembly J4-1 P1-1 J2-1A J2-1B TP3 Sig A Hi Sig A com TP5 Phas6 B U770-9 J723-11 J2-11 J4-5 P1-5 J4-1A J4-1B Sig B Hi Sig B com TP7 Phase C U774-9 J723-17 J2-17 J4-3 P1-3 J6-1A J6-1B Sig C Hi Sig C com Figure 3-2.
4 Principles of Operation Introduction Figure 4-1 ( at end of this chapter ) is a block diagram showing the major circuits within the ac source.
A5 Relay Range / Sense Assembly The A5 assembly consists of the output voltage filters, the output voltage range relays A5Kl, A5K2 and A5K3, the output voltage disconnect relays A5K5, A5K6, A5K8 A5K9 and remote sense relays A5K4, A5K7 and all associated circuits. It also interconnects the A7 GPIB/RS232 assembly, A11 front panel assembly and A8 DSP assembly with each other and the trigger and DFI/RI signals. The Agilent 6814B and 6834B A5 assemblies are not interchangeable.
A10 Auxiliary Power Supply The 300 Vdc is used by the A10 board to generate the bias voltages. The 300 Vdc input line is fused by a 1 ampere subminiature fuse, A10F1. The A10 supplies an isolated +5 Vdc for the A7 GPIB/RS232 interface board and A11 front panel board. The + 15 VSW dc to the A4 mother board via J2, the +/-15V and +5Vsec to the A6 servo board via J4 and +5V sec to the A8 DSP board via J5. It also supplies the 12-24 Vdc for the fan speed control.
Figure 4-1.
5 Replaceable Parts Introduction This section lists the replaceable electrical and mechanical parts for the Agilent 6814B and 6834B AC Power Source/Analyzers and 6843A RTS. Reference Desig. Al-A3 A1-A3 A4 A4 A5 A5 A5 A6 A6 A6 A7 A7 A8 A8 A8 A9 A9 A10 A11 A12 A12 A13 A13 A14 A15 A11G1,G2 A8U724 A4F1-A4F3 A7F1 A9F1 A9F2-A9F4 A10F1 A10F2 – A10F7 Table 5-1. Agilent 6814B, 6834B & 6843A Replacement Assemblies Model / Input Option Agilent Part No.
Table 5-1. Agilent 6814B, 6834B & 6843A Replacement Assemblies (continued) Reference Desig. Model / Input Option Agilent Part No.
6 Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining the Agilent 6814B and 6834B AC Power Source/Analyzers. Unless otherwise specified in the drawings, a drawing or diagram applies to all models and input voltage options. Table 6-1. General Schematic Notes: 1. All resistors are in ohms ± 1%, 1/8 W, unless otherwise specified. 2. All capacitors are in microfarads unless otherwise specified. 3.
A6 Servo A7 HPIB K1 A8 Digital Signal Processor DSP CR1 A5 Relay / Filter L1 A3 Output Switching Assembly ( not used on 6814A/B ) A4 mother board A9 Input power A2 Outpuit Switching Assembly F1 A11 Front Panel Assembly A10 Aux power supply C1 F2 A1 Output Switching Assembly F3 6814B, 6834B, 6843A Mechanical Layout 208/230 Volt Input K1 A5 Relay / Filter L1 A12 Bias Power Supply CR1 A6 Servo A7 HPIB A8 DSP Assembly ( not used on 6814A/B ) C9 C10 A9 Input power L2 A2 Output Switching A
Figure 6-2.
Figure 6-3.
Figure 6-4.
Figure 6-5.
Figure 6-6.
Figure 6-7.
Figure 6-8.
Figure 6-9.
Figure 6-10.
Figure 6-11.
Figure 6-12.
C O MM ON M O D E IN D UC T ER S L1, L2, L3, L4, L5 and L6 MO U N T ED ON FAR SIDE OF A4 M OT HER ASSEM BLY Figure 6-13.
1 1 3 J723 J721 U755 U783 U781 U753 1 1 U754 U751 DAC out phase A + 5V U785 J722 J746 D COM + 5V UNREG ( 8-9 Vdc ) U787 Figure 6-14.
+5VSEC +15V TP 8 TP 9 J6 TP 5 J5 Phase 2 TP 1 TP 7 Phase 3 COM TP 10 TP 3 Phase 1 -15V TP 4 TP 6 TP 2 J2 J1 J4 J3 Figure 6-15 A6 Servo Board Test Point Location 52 Diagrams
Index A AC Power Source modules ..........................................................................................................................................31 C calibration configuration switch...................................................................................................................................21 change sheets .............................................................................................................................................................
I *IDN query ..................................................................................................................................................................20 inhibit cal switch position ........................................................................................................................................................21 initializing the unit .................................................................................................................................
R ram error ......................................................................................................................................................................21 reinitializing unit..........................................................................................................................................................20 related documents .........................................................................................................................................
Manual Updates The following updates have been made to this manual since the print revision indicated on the title page. 7/99 The Digital Voltmeter Characteristics on page 9 have been corrected. The Output Balance Adjustments on page 22 have been updated. Step 6 on page 23 has been corrected. The note on the bottom of page 25 has been updated. The fuses, rear panel, and rear panel label part numbers in table 5-1 have been updated (pp. 35-6) 11/99 The serial numbers on the title page have been updated.