Page 1 GPIB DC Power Supplies Agilent Series 654xA, 655xA, 664xA, 665xA For instruments with Serial Numbers: Agilent Model 6541A: US36360101 and above * Agilent Model 6542A: US36360101 and above * Agilent Model 6543A: US36340101 and above * Agilent Model 6544A: US36390101 and above *...
Page 2: Limitation Of Warranty
If Agilent Technologies, Inc. is unable, within a reasonable time to repair or replace any product to condition as warranted, the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies, Inc.
Page 3 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".
Page 4: Printing History
Notice The information contained in this document is subject to change without notice. Agilent Technologies makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability, and fitness for a particular purpose.
Page 5: Table Of Contents
Table of Contents Introduction .................................... 7 Scope ....................................7 Conventions Used In Text..............................7 Manual Revisions................................8 Safety Considerations ................................. 8 Firmware Revisions ................................8 Electrostatic Discharge ............................... 8 Verification....................................9 Introduction..................................9 Test Equipment Required..............................9 Measurement Techniques..............................11 Setup for Most Tests ..............................
Page 6 A3 Front Panel Board Circuits (Figure 4-5)........................89 A2 GPIB Board Circuits For Agilent Models 664xA and 665xA Only................. 90 Isolator Board Circuits for Agilent Models 654xA and 665xA Only (Figure 4-7) ............91 Replaceable Parts ................................. 95 Introduction..................................95 Chapter Organization ..............................
Page 7: Introduction
Chapter 2, Table 2-1. For information in determining the performance level of the power supply, either before or after repair, refer to Chapter 2, Verification. The functional circuit operation of the various Agilent models is described in Chapter 4. Replaceable parts lists and circuit diagrams are included in Chapters 5 and 6, respectively.
Page 8: Manual Revisions
For GPIB models 664xA and 665xA, you can use the “*IDN?” query, as described in Chapter 3, to get the firmware revision numbers of your power supply's firmware. For Agilent models 654xA and 655xA, the revision number can be read from the label affixed atop the IC chip.
Page 9: Verification
Verification Introduction This Chapter contains test procedures to verify that the Agilent Power Supply is operating normally. There are three types of tests as follows: Test Description Built-In Self-Tests These tests are run automatically when the power supply is turned on.
Page 10 Table 2-2. Test Equipment Required for Verification Type Required Characteristics Recommended Model Current Monitor Resistor Guildline 9230/100 100 A (0.01 ) 0.04% for Agilent 6541A, 6551A, 6552A, 6641A, 6651A, & 6652A models. 15 A (0.1 ) 0.04% for Agilent Guildline 9230/15 6542A, 6543A, 6544A, 6545A,...
Page 11: Measurement Techniques
Measurement Techniques Setup for Most Tests Most tests are performed at the rear terminals of the supply as shown in Figure 2-1. Measure the DC voltage directly at the +S and -S terminals. Set the output for remote sensing and use adequate wire gauge for the load leads as described in Chapter 4 of the Operating Manual.
Page 12 (CV TESTS) (CV TESTS) Figure 2-1. Basic Test Setup 12 Verification...
Page 13: Programming
Full-Scale Max. Prog. Full-Scale Max. Prog. Max. Prog. Voltage Voltage Current Current Overvoltage 200 Watt Supplies 6541A, 6641A 8.190 V 20 A 20.475 A 8.8 V 6542A, 6642A 20 V 20.475 V 10 A 10.237 A 22 V 6543A, 6643A 35 V 35.831 V...
Page 14: Cv Load Effect
CV Load Effect This test measures the change in output voltage resulting from a change in output current from full load to no load. Turn off the supply and connect the output as shown in Figure 2-1 with the DVM connected between the +S and -S terminals.
Page 15: Transient Recovery Time
Transient Recovery Time This test measures the time for the output voltage to recover to within the specified value following a 50% change in the load current. Turn off the supply and connect the output as in Figure 2-1 with the oscilloscope across the +S and the -S terminals. Turn on the supply and program the output voltage to the full-scale value and the current to the maximum programmable value (see Table 2-3).
Page 16: Current Sink (Cc-) Operation
DC measurements should be made and the average of these reading calculated. An example of how to do this is given below using an Agilent 3458A System Voltmeter programmed from the front panel. Set up the voltmeter and execute the “Average Reading”...
Page 17: Cc Source Effect
Turn on the supply and program the current to the full scale current value and the output voltage to the maximum programmable voltage value (see Table 2-3). Adjust the load in the CV mode for full scale voltage as indicated on the front panel display. Check that the CC annunciator is on.
Page 18 Figure 2-3. CC RMS Noise Measurement Test Setup 18 Verification...
Page 19 Table 2-4. Performance Test Record Form Test Facility: __________________________________________ Report No.__________________________________________ __________________________________________ Date______________________________________________ __________________________________________ Customer___________________________________________ __________________________________________ Tested By___________________________________________ Model_____________________________________ Ambient Temperature__________________________________ Serial No.__________________________________ Relative Humidity_____________________________________ Options ___________________________________ Nominal Line Frequency (Hz)___________________________ Firmware Revision___________________________ Special Notes: ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________...
Page 20 Table 2-5. Performance Test Record for Agilent Model 6541A or 6641A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -5 mV ________mV +5 mV...
Page 21 Table 2-6. Performance Test Record for Agilent Model 6542A or 6642A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -10 mV ________mV +10 mV...
Page 22 Table 2-7. Performance Test Record for Agilent Model 6543A or 6643A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -15 mV ________mV +15 mV...
Page 23 Table 2-8. Performance Test Record for Agilent Model 6544A or 6644A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -26 mV ________mV +26 mV...
Page 24 Table 2-9. Performance Test Record for Agilent Model 6545A or 6645A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -51 mV ________mV +51 mV...
Page 25 Table 2-10. Performance Test Record for Agilent Model 6551A or 6651A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -5 mV ________mV +5 mV...
Page 26 Table 2-11. Performance Test Record for Agilent Model 6552A or 6652A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -10 mV ________mV +10 mV...
Page 27 Table 2-12. Performance Test Record for Agilent Model 6553A or 6653A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -15 mV ________mV +15 mV...
Page 28 Table 2-13. Performance Test Record for Agilent Model 6554A or 6654A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -26 mV ________mV +26 mV...
Page 29 Table 2-14. Performance Test Record for Agilent Model 6555A or 6655A MODEL Agilent _____________ Report No.______________ Date_____________________ Test Description Minimum Results Maximum Spec. Spec. Constant Voltage Tests Voltage Programming and Readback Low Voltage (0 V) V -51 mV ________mV +51 mV...
Page 31: Troubleshooting
See "EEPROM Initialization" later in this chapter. Chapter 5 in this manual lists all of the replaceable parts for the different Agilent series of power supplies. Chapter 6 contains schematics, test point measurements, and component location diagrams to aid you in troubleshooting the supply.
Page 32 Figure 3-1. Top View with Cover Removed for 655xA & 665xA Models, (Sheet 1 of 2) 32 Troubleshooting...
Page 33 Figure 3-1. Top View with Cover Removed for 655xA & 665xA Models, (Sheet 2 of 2) Troubleshooting 33...
Page 34: Overall Troubleshooting
To communicate with the supply via the HP Series 200/300 models 664xA & 665xA). GPIB interface. Signature Analyzer To troubleshoot most of the primary and Agilent 5005 A/B secondary interface circuits Digital Voltmeter To check various voltage levels. Agilent 3458A Logic Probe To check data lines.
Page 35: Signature Analysis
Signature Analysis The easiest and most efficient method of troubleshooting microprocessor based instruments is signature analysis (SA). The SA technique is similar to signal tracing with an oscilloscope in linear circuits. Part of the microprocessor memory is dedicated to signature analysis and a known bit stream is generated to stimulate as many nodes as possible within a circuit. However, because it is virtually impossible to analyze a bit stream with an oscilloscope, a signature analyzer is used to compress the bit stream into a four character signature.
Page 36 Manual. If power loss is not the problem, EEPROM A3U6 could be defective (after replacing U6, supply must be initialized and calibrated). The following four items (E4-E7) apply only to Agilent models 664xA & 665xA supplies. E4 PRI XRAM Primary interface external RAM test RAM A2U108 defective.
Page 37 Figure 3-2. Overall Troubleshooting Flow Diagram (Sheet 1 of 4) Troubleshooting 37...
Page 38 Figure 3-2. Overall Troubleshooting Flow Diagram (Sheet 2 of 4) 38 Troubleshooting...
Page 39 Figure 3-2. Overall Troubleshooting Flow Diagram (Sheet 3 of 4) Troubleshooting 39...
Page 40 Figure 3-2. Overall Troubleshooting Flow Diagram (Sheet 4 of 4) 40 Troubleshooting...
Page 41: Firmware Revisions (For Models 664Xa & 665Xa)
(f) firmware revision (see Table 3-4). sA.01.02 is the secondary interface (s) firmware revision (see Table 3-5). For Agilent models 654xA & 655xA, the revision level of the ROMs can be found on the label affixed to the physical IC chip itself. Test Headers For Agilent models 664xA &...
Page 42 This is the normal operating/storage position for the jumper. Primary Interface Test Connector Description A2J106 Pins, For Agilent Models 664xA & 665xA Only 1 and 2 (SA MODE) With these pins jumpered, the primary interface is placed in the SA mode.
Page 43 Figure 3-4. Connections For A2 GPIB Board Models 664xA & 665xA Only (Sheet 1 of 3) Troubleshooting 43...
Page 44 Figure 3-4. Connections For A2 GPIB Board Models 664xA & 665xA Only (Sheet 2 of 3) 44 Troubleshooting...
Page 45 Figure 3-4. Connections For A2 GPIB Board Models 664xA & 665xA Only (Sheet 3 of 3) Troubleshooting 45...
Page 46 Turn off the power supply and remove the top cover. Connect SA jumper of connector JlO6 on A2 Agilent board to pins 1 and 2. Remember the original jumper position as you will need to restore the jumper to its original position after this test.
Page 47 Table 3-4. Front Panel SA Test Description: These signatures check microprocessor A3U3 on the front panel board. Valid A3U4 ROM Firmware Revision: A.01.07 Test Setup: See Figure 3-4 Sheet 2 (for 200 Watt) or Sheet 3 (for 500 Watt) supplies. Turn off the power supply and remove the top cover.
Page 48 Table 3-5. Secondary Interface SA Test Description: These signatures check the secondary microprocessor AlU504. Valid AlU504 ROM Firmware Revision: A.01.03 Test Setup: See Figure 3-4 either Sheet 2 or Sheet 3 as applicable to your model. Turn off the power supply and remove the top cover. Connect signature analyzer CLOCK, START, STOP, and GROUND inputs and setup as follows: Signature Analyzer Edge...
Page 49: Troubleshooting Procedures
Troubleshooting Procedures Flow Charts Troubleshooting flow charts for various circuits are given in Figures 3-5 through 3-l0 and 3-12 through 3-16. The appropriate flow chart is used when a particular trouble symptom has been encountered during the self test (see Table 3-2) or when performing the overall troubleshooting procedures (see Figure 3-2).
Page 50: Calibration Password
(between pins J3-3 and J3-4) and return it to the NORM position (between pins J3-7 and J3-8) in order to calibrate the supply. Calibration Password In order to enter the calibration mode, you must use the correct password as described in Appendix A of the Operating Manual.
Page 51 Figure 3-5. No Display Troubleshooting Troubleshooting 51...
Page 52 Figure 3-6. OV Will Not Fire Troubleshooting 52 Troubleshooting...
Page 53 Figure 3-7. OV At Turn-On Troubleshooting (Sheet 1 of 2) Troubleshooting 53...
Page 54 Figure 3-7. OV At Turn-On Troubleshooting (Sheet 2 of 2) 54 Troubleshooting...
Page 55 Figure 3-8. Output Held Low Troubleshooting (Sheet 1 of 2) Troubleshooting 55...
Page 56 Figure 3-8. Output Held Low Troubleshooting (Sheet 2 of 2) 56 Troubleshooting...
Page 57 Figure 3-9. Output Held High Troubleshooting Troubleshooting 57...
Page 58 Figure 3-10. DAC Circuits Troubleshooting 58 Troubleshooting...
Page 59 Figure 3-11. DAC Waveforms Figure 3-12. CV/CC DAC and Amplifier Troubleshooting Troubleshooting 59...
Page 60 Figure 3-13. Serial Down Troubleshooting (Sheet 1 of 2) 60 Troubleshooting...
Page 61 Figure 3-13. Serial Down Troubleshooting (Sheet 2 of 2) Troubleshooting 61...
Page 62 Figure 3-14. Secondary Down Troubleshooting (Sheet 1 of 2) 62 Troubleshooting...
Page 63 Figure 3-14. Secondary Down Troubleshooting (Sheet 2 of 2) Troubleshooting 63...
Page 64 Figure 3-15. Slow Down Programming Troubleshooting 64 Troubleshooting...
Page 65 Figure 3-16. Isolator Board Circuits Troubleshooting Troubleshooting 65...
Page 66: Eeprom Initialization
For 664xA & 665xA models, the program in Figure 3-17 can be run to reinitialize the supply. This program contains statements for several different Agilent models. You can shorten and thus customize this program for just your specific model by deleting the statements from this program listing that apply to models that you do not use.
Page 67 ! Data for word length DATA 4,4,4,4,1,1,4,4,4,4 DATA 1,1,4,4,4,4,1,1,1,1 DATA 4,4,4,4,4,2,1,1,1,1 DATA 2,2,2,1,1,1,1,1,1,1 DATA 1,1,1,2,1 250 Eprom_data_6x41: ! EEPROM data for 6541A and 6641A DATA 468.3,16.6,8.19,0,83,0,177,140,20.475,0 DATA 99,1,78.25,78.25,8.8,0,83,255,20,10 DATA 6541,456.09,168.18,182,168.18,1768,5,255,0,0 DATA 16,6541,0,20,180,20,180,156,37,26 DATA 120,15,20,0,4 320 Eprom data_6x42: ! EEPROM data for 6542A and 6642A DATA 195.534,4.434,20.475,0,83,0,354,140,10.238,0...
Page 68 530 Eprom_data_6x45: ! ! EEPROM data for 6545A and 6645A DATA 32.42,16.6,122.85,0,82,0,2358,140,1.537,0 DATA 100,1,5.313,117.38,132,0,82,255,20,10 DATA 6545,30.41,168.18,2436,168.18,1768,5,255,0,0 DATA 16,6545,0,20,180,20,180,156,37,26 DATA 186,15,20,0,4 600 Eprom_data_6x51: ! ! EEPR0M data for 655lA and 6651A DATA 486.3,16.6,8.19,0,83,0,70.16,136.86,51.188,0 DATA 99,1,78.25,78.25,8.8,0,83,255,20,10 DATA 6551,456.09,168.18,72.47,168.18,1768,5,255,0,0 DATA 16,6551,0,20,180,20,180,156,37,26 DATA 186,15,20,0,4 670 Eprom_data_6x52: ! ! EEPR0M data for 6552A and 6652A DATA 195.534,4.434,20.475,0,83,0,141.87,97.29,25.594,0...
Page 69 1060 1070 FOR I=1 T0 45 1080 READ Length(I) 1090 NEXT I 1100 1110 SELECT Model$ uppercase 1120 1130 CASE "6541A" 1140 RESTORE Eprom_data_6x41 1150 CASE "6542A" 1160 RESTORE Eprom_data_6x42 1170 CASE "6543A" 1180 RESTORE Eprom_data_6x43 1190 CASE "6544A" 1200...
Page 70 1550 RESTORE Eprom_data_6x55 1560 1570 CASE ELSE 1580 PRINT "Model number not found. Program is for Agilent models" 1590 PRINT "6541A, 6542A, 6543A, 6544A and 6545A" 1600 PRINT "6641A, 6642A, 6643A, 6644A and 6645A" 1610 PRINT "6551A, 6552A, 6553A, 6554A and 6555A"...
Page 71 2030 2040 INPUT "Select Initialization (I) or Factory preset replacement (F).",Sel$ 2050 CLEAR SCREEN 2060 SELECT (UPC$(Sel$)) 2070 CASE "I" ! Select Initialization 2080 GOTO Init_eeprom 2090 CASE "F" ! Select install new factory data 2100 GOTO Fact_preset 2110 CASE ELSE 2120 BEEP 2130...
Page 72: Disassembly Procedures
2540 READ Cal_dest_addr(I) 2550 NEXT I 2560 2570 RESTORE Fact_cal_len 2580 FOR I=1 T0 9 2590 READ Cal_length(I) 2600 NEXT I 2610 2620 FOR I=1 T0 9 ! Locations of good data 2630 OUTPUT @Ps;"DIAG:EEPR?";Cal_sour_addr(I);",";Cal_length(I) Read good data 2640 ENTER @Ps;Cal_data$ ! Enter good data 2650 OUTPUT @Ps;"DIAG:EEPR";Cal_dest_addr(I);",";Cal_length(I);",";Cal_data$ !
Page 73 Figure 3-18. Location of Cable and Connector Locations for 655xA and 665xA Models Only Troubleshooting 73...
Page 74: List Of Required Tools
List of Required Tools lPT and 2PT Pozidriv screwdrivers. Tl0, T15 and T25 Torx screwdrivers. Allen wrench, 0.050 inch. Hex driver, 7 mm. Long nose pliers. Antistatic wrist discharge strap. Top Cover, Removal & Replacement Using a T25 Torx screwdriver, unscrew the two screws which hold the carrying straps to the power supply, and then remove the other two screws from the opposite side of the case.
Page 75: A2 Isolator Board, Removal & Replacement (For 654Xa & 655Xa Only)
Figure 3-20. GPIB Connector and GPIB Board Holding Screws, Power Supply Rear View A2 Isolator Board, Removal & Replacement (for 654xA & 655xA Only) To remove the Isolator board, proceed as follows: Remove the top cover of the power supply as described under, "Top Cover Removal and Replacement." At the rear of the power supply, locate and remove the two (2) screws that hold the Isolator board to the chassis.
Page 76: S1 Line Switch, Removal And Replacement
Figure 3-21. Removing Vinyl Strip from Sides of Front Panel Assembly S1 Line Switch, Removal and Replacement First remove the front panel assembly as described under, "Front Panel Assembly, Removal and Replacement”. On the front panel assembly, release the switch locking tabs by pressing them inward against the body of the switch, and then remove the switch.
Page 77: A1 Main Board
Figure 3-22. Location of Front Panel Board Holding Screw and Restraining Tab A1 Main Board Remove the top cover and the A2 board (Isolator or GPIB board). Disconnect all cables going to connectors on the main board. Note Be sure to mark any or all cables prior to removal so that no mistake is made later when reinstalling these cables.
Page 78: A4A1 Or A4A3 Left Tunnel Board, Removal And Replacement
Disconnect cables W11/W12 and W15/W16 from connectors J201/J202 and J301/J302 on top left and on top right tunnel boards, respectively. Remove the top heatsink assembly and the attached tunnel boards by sliding the top assembly towards the rear and off of the bottom heatsink assembly.
Page 79 In the supply chassis, remove the two screws (three screws for 6x4xA) securing the transformer to the bottom of the chassis. At the front of the chassis, remove the two screws securing the transformer to the chassis. Use long nose pliers to disconnect all wires going to the transformer terminals. Lift the transformer out of the chassis.
Page 81: Principles Of Operation
This section describes the different functional circuits used in the power supply models covered in this manual. The topics are presented in the following order: First, the I/O external signals that connect to the Agilent power supply are described. Next, the overall block diagram for the power supply is described, and last, each functional block shown in the overall block diagram is discussed in detail.
Page 82 -OUT) leads to be monitored. The Rx and Tx serial link permits up to 16 Agilent power supplies to be connected in a daisy chain fashion, each with its own unique programmed device address. One GPIB address with other units being subaddressed.
Page 83: Overall Block Diagram (Figure 4-2)
Common INH Common Overall Block Diagram (Figure 4-2) All of the Agilent Technologies power supplies covered in this service manual consist of four major functional circuit groups. They are: Secondary Interface Circuits on the A1 Main Board. . Output Power and Control Circuits on the A1 Main Board.
Page 84 Figure 4-2. Overall Block Diagram The CV DAC/Op amplifier converts the programmed value of voltage on the bus into the CVPROG signal, which is sent to the CV control circuits in order to control the magnitude of the output voltage in the CV mode. The CVPROG signal is in the 0 to -10 V range, which corresponds to the zero to full-scale output voltage range of the supply.
Page 85 The readback DAC circuit is controlled by the microprocessor to successively approximate the value of each signal monitored to twelve-bit resolution. The CVPROG and CCPROG signals are used during the self test to check operation of the DAC/Op amplifier circuits. Figure 4-3.
Page 86: Output Power And Control Circuits (Figure 4-4)
A4A1-A4A4 tunnel boards for the 500 watt models, and on the main board for the 200 watt models). For the 500 watt Agilent 655xA and 665xA models, there are two (top and bottom) left tunnel circuits (A4A1 and A4A3) and two (top and bottom) right tunnel circuits (A4A2 and A4A4). The 200 watt Agilent 654xA and 664xA models use one left and one right tunnel circuit.
Page 87 Figure 4-4. Output Power and Control Circuits Principles of Operation 87...
Page 88 With the CV mode in effect, the CV loop will regulate the output voltage. The CV control circuit compares the programmed voltage signal CVPROG (0 to -10 V range) with the output voltage monitor signal VMON. The VMON signal is in the 0 to +10 V range which corresponds to the zero to full-scale output voltage range of the supply.
Page 89: A3 Front Panel Board Circuits (Figure 4-5)
EEPROM storage locations holds a checksum value which is used to verify the integrity of the EEPROM data. All Agilent models can be calibrated from the front panel. Agilent models 664xA and 665xA can also be calibrated via the GPIB by using SPCI commands (see Appendix A in the Operating Manual). Access to the calibration data in the EEPROM...
Page 90: A2 Gpib Board Circuits For Agilent Models 664Xa And 665Xa Only
A3J3, located on front panel board (see Calibration in the Operating Manual). In addition, for models Agilent 664xA and 665xA, the front panel EEPROM can be updated from the GPIB interface, whereas, the memory circuits used in models Agilent 654xA and 655xA cannot be programmed via the GPIB interface.
Page 91: Isolator Board Circuits For Agilent Models 654Xa And 665Xa Only (Figure 4-7)
Figure 4-6. GPIB Board, Simplified Block Diagram (Models Agilent 664xA and 665xA Only) Terminal strip TB101 can be strapped to provide one of four digital input/output control signals (see Table 4-4). The Power Supply Operating Manual describes how to select one of these three sets of signals. As shipped from the factory, this terminal strip is connected for FLT output and INH input.
Page 92 Figure 4-7. Isolator Board, Simplified Block Diagram (Models Agilent 654xA and 655xA) Note Note that for Agilent 664xA and 665xA models, the PCLR* is generated in the GPIB board. For Agilent models 654xA and 655xA, the PCLR* originates at the main board secondary circuits and is routed to the isolator board.
Page 93 The isolator board includes three separate optical isolator circuits that isolate the front panel signals: RxD, TxD, and PCLR* signals from the SRx, BSTx and SPCLR* signals at the secondary interface circuits. Figure 4-8. +5 V BIAS and PCLR* Timing Sequence Principles of Operation 93...
Page 95: Replaceable Parts
How To Order Parts You can order parts from your local Agilent Technologies Sales and Support Office (see the list of offices in the back of this manual). When ordering a part, please include the following information the Agilent part number...
Page 96 Table 5-4. Main Chassis Replaceable Parts for 200 Watt Models 654xA and 664xA Reference Applicable Agilent Part No. Description Desig. Models 65/6641A 06641-61030 Mother Board PCA Tested 65/6642A 06642-61030 Mother Board PCA Tested 65/6643A 06643-61030 Mother Board PCA Tested 65/6644A...
Page 97 Table 5-4. Main Chassis Replaceable Parts for 200 Watt Models 654xA and 664xA(continued) Reference Applicable Agilent Part No. Description Desig. Models 0370-3238 Knob Ref RPG 0370-2862 Pushbutton 0380-0181 Spacer round .75-lN REF fan mounting 0380-1524 HEX standoff 8-MM REF Isolator PCA...
Page 98 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA Reference Applicable Models Agilent Part No. Description Desig. C202-C204 0160-4801 Capacitor l00PF 5% C205 0160-4835 Capacitor .lUF 10% 50V C206 65/6641A 0160-4835 Capacitor .lUF 10% 50V...
Page 99 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA(continued) Reference Applicable Models Agilent Part No. Description Desig. C524 65/6641A 0160-5422 Capacitor .047UF 20% C600 0160-5422 Capacitor .047UF 20% C602 0180-3298 Capacitor 2200UF 50V...
Page 100 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA(continued) Reference Applicable Models Agilent Part No. Description Desig. C694 65/6641A 0160-5410 Capacitor 3300PF 5% C695 65/6641A 0180-4469 Capacitor 4700UF 20V C695 65/6642A 0180-2724 Capacitor 550UF 40V AL...
Page 101 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA(continued) Reference Applicable Models Agilent Part No. Description Desig. D604 1901-1098 Diode 1N4150 D605 1901-1098 Diode 1N4150 D606 1901-1098 Diode 1N4150 D610 1901-0880 Diode General Purpose...
Page 102 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. F402 2110-0697 Fuse, subminature 15AM, 32V F403 2110-0697 Fuse, subminature 15AM, 32V F415 65/6641A-65/6644A 8159-0005...
Page 103 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. Q303 65/6641A-65/6644A 1854-0989 XSTR NPN SI Q303 65/6645A 1855-0849 MOSFET-N-CHAN Q304 65/6641A, 65/6642A 5060-3315 FET Assembly HS (1855-0725)
Page 104 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R216 65/6641A, 65/6642A 0811-3849 Resistor 0.25 5% 3W R216 65/6643A 0811-3848 Resistor 0.39 5% 3W...
Page 105 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R317 0698-3430 Resistor 21.5 1% R318 65/6641A-65/6644A 0698-3441 Resistor 215 1% .125W R319 0757-0280 Resistor 1K 1% .125W...
Page 106 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R518 0698-0084 Resistor 2.15K 1% R520 0698-3155 Resistor 4.64K 1% R501 65/6645A 8159-0005 Resistor Zero Ohms...
Page 107 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R535 0698-6320 Resistor 5K .1% .125W R537 65/6641A, 65/6642A 0757-0442 Resistor l0K 1% .125W R537...
Page 108 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R583 0698-3160 Resistor 31.6K 1% R584 0757-0442 Resistor l0K 1% .125W R585 0757-0419 Resistor 681 1% .125W...
Page 109 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R624 6645A 0698-6353 Resistor 50K .1% R625 All except 6644A 0699-2246 Resistor 25K .05% R625...
Page 110 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R657 65/ 6645A 0811-3771 Resistor .25 Ohm 1% R658 0757-0458 Resistor 51.1K 1% R659 65/6643A 0757-0316 Resistor 42.2 1%...
Page 111 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R692 65/6641A-65/6642A 0757-0280 Resistor 1K 1% .125W R697 0683-1065 Resistor l0M 5% .25W R700 0698-3162 Resistor 46.4K 1%...
Page 112 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R740 0698-3155 Resistor 4.64K 1% R741 0698-3155 Resistor 4.64K 1% R742 0757-0199 Resistor 21.5K 1%...
Page 113 Table 5-5. Parts List For 200 Watt A1 Main Board for Agilent Models 654xA and 664xA (continued) Reference Applicable Models Agilent Part No. Description Desig. U512 1826-1896 IC-Linear U513 1826-1370 IC 365 U600 5060-3321 Regulator (1826-0126) U601 5060-3320 Regulator (1826-0122)
Page 114 Table 5-6. Parts List For 500 Watt 655xA & 665xA Main Chassis Reference Applicable Agilent Part Description Desig. Models 5060-3436 Fan, 4-inch, tubeaxial, 12Vdc F450 2110-0054 Fuse 15AM, 250V (for 100 Vac line) F450 2110-0249 Fuse 12AM, 250V (for 120 Vac line)
Page 115 Table 5-6. Parts List For 500 Watt 655xA & 665xA Main Chassis (continued) Reference Applicable Models Agilent Part No. Description Desig. 6555A 06555-61001 Front Panel Board Initialized & Tested 6551A 06551-80001 Name plate 6552A 06552-80014 Name plate 6553A 06553-80001 Name plate...
Page 116 Table 5-6. Parts List For 500 Watt 655xA & 665xA Main Chassis (continued) Reference Applicable Models Agilent Part No. Description Desig. 5041-8801 Foot 0360-2191 Cover, terminal block 0361-1240 Rivet-blind (ref GPIB bracket to chassis) 0370-2862 Pushbutton (ref sense switch S610)
Page 117 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA Reference Applicable Models Agilent Part No. Description Desig. C403 65/6651A, 65/6652A 0160-5422 Capacitor .047 uF 20% 65/6653A-65/6655A Not used C404 65/6651A, 65/6652A Not used 65/6654A, 65/6655A...
Page 118 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. C517,518 0160-5422 Capacitor .047 uF 20% C519 65/6651A-65/6655A 0180-4129 Capacitor 1 uF 35V C520-522 0160-5098 Capacitor .22 uF 10%...
Page 119 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. C690 65/6651A Not used 65/6652A 0180-2728 Capacitor 1100 uF 40V 65/6653A 0180-3382 Capacitor 440 uF 50V 65/6654A...
Page 120 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. D409 1901-1087 Diode pwr rect D600-603 1901-0731 Diode pwr rect D604-606 1901-1098 Diode IN4150 D610-614 1901-0033 Diode...
Page 121 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R405 65/6651A-65/6653A 8159-0005 Resistor 0 Ohms 65/6654A, 65/6655A Not used R407,408 Not used R409 65/6651A Not used...
Page 122 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R619 0698-0082 Resistor 464 1% .125W R620,621 0757-0449 Resistor 20K 1% .125W R622 65/6651A-65/6653A, 0699-2246 Resistor 25K .05%...
Page 123 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R646 65/6651A, 65/6652A 0699-1156 Resistor 72K .1% 65/6653A, 65/6654A 0698-6353 Resistor 50K .1% 65/6655A 0698-6359 Resistor 80K 1%...
Page 124 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R680 65/6651A 0698-0084 Resistor 2.15K 1% 65/6652A 0757-0283 Resistor 2K 1% .125W 65/6653A, 65/6654A 0757-0280 Resistor 1K 1% .125W...
Page 125 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. R715 0757-0280 Resistor 1K 1% .125W R716 0698-0084 Resistor 2.15K 1% R717,718 0698-3441 Resistor 215 1% .125W...
Page 126 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. RT770 0837-0412 Thermistor S610 3101-2894 Switch-PB DPDT (SENSE) U502 5080-2150 IC Prgmd-GAL U503 1826-1370 IC 365 Comp...
Page 127 Table 5-7. Parts List For 500 Watt A1 Main Board for 655xA & 665xA (continued) Reference Applicable Models Agilent Part No. Description Desig. 3050-0236 Washer-FL MTLC (ref D400,404,690,CR700) 3050-0891 Washer-FL MTLC (ref J451) 4330-0145 Insulator bead glass (Y501) 3050-0420 Washer-FL MTLC (ref HS400, 690) 0515-0909 Screw machine M4 x 0.712 mm lg.
Page 128 Table 5-9A. A2 GPIB Board Replaceable Parts for 664xA & 665xA (surface-mount) This table applies to units identified on the title page of this manual. Refer to Backdating for additional units Ref. Desig. Agilent Part No. Description C012-105 0160-6100 Capacitor 1000pF 100V...
Page 129 Table 5-9A. A2 GPIB Board Replaceable Parts for 664xA & 665xA Only (continued) Ref. Desig. Agilent Part No. Description TB101 0360-2312 Terminal block (digital control) U101 1826-2801 IC MC3423Pl U106 5080-2273 IC ROM GPIB U108 1818-4859 IC MCM 6164C55 U109...
Page 130 Table 5-9B. A2 GPIB Board Replaceable Parts for 664xA & 665xA Only (continued) Ref. Desig. Agilent Part No. Description J106 1251-4926 Connector receptacle (test header) J107,108,114,115 1251-7330 Connector receptacle phone L101 9100-1610 Inductor 150nH 20% P101 1251-4245 Connector plug 2-pin (ac bias)
Page 131 Table 5-10. A3 Front Panel Board, Replaceable Parts For All Models Ref. Desig. Agilent Part No. Description 0160-5422 Capacitor 0.047 F 20% 0160-4808 Capacitor 470pF 5% 0160-4787 Capacitor 22pF 5% 100 V 0180-0155 Capacitor 2.2 F 20 V C6,7 0160-5422 Capacitor 0.047 F 20%...
Page 132 Table 5-11. A4A1/A4A3 Left Tunnel Board Parts for 500 Watt 655xA & 665xA Models Reference Applicable Models Agilent Part No. Description Desig. C20l-204 0160-4801 Capacitor 100pF 5% 100V C205,206 0160-4835 Capacitor 0.luF 10% 50V C207 0160-4801 Capacitor 100pF 5% 100V...
Page 133 Table 5-11. A4A1/A4A3 Left Tunnel Board Parts for 500 Watt 655xA & 665xA Models (continued) Reference Applicable Models Agilent Part No. Description Desig. R209 0757-0280 Resistor 1K 1% .125W R210 65/6651A, 65/6652A 0698-8959 Resistor 619K 1% 65/6653A-65/6655A 0757-0481 Resistor 475K 1%...
Page 134 Table 5-12. A4A2/A4A4 Right Tunnel Board Parts List for 500 Watt 655xA & 665xA Models Reference Applicable Models Agilent Part No. Description Desig. C301-304 0160 4801 Capacitor 100 pF 5% C305,306 0160-4835 Capacitor luF 10% 50V C307 0160-4801 Capacitor 100 PF 5%...
Page 135 Table 5-12. A4A2/A4A4 Right Tunnel Board Parts List for 500 Watt 655xA & 665xA Models (continued) Reference Applicable Models Agilent Part No. Description Desig. R309 0757-0280 Resistor 1K 1% .125W R310 65/6651A, 65/6652A, 0698-3454 Resistor 215K 1% 65/6653A 65/6654A, 65/6655A...
Page 137: Diagrams
Diagrams Introduction This chapter contains various diagrams for use in troubleshooting and maintaining the Agilent power supplies. Separate diagrams and/or tables are provided to show model differences. For wiring connections to external equipment, refer to the Operating Manual. Interconnections Figure 6-1 is the overall interconnection diagram. The location of each circuit board in the supply chassis is given in Chapter 3, Figure 3-1.
Page 138 Table 6-1. Signal Name Descriptions Signal Name Description A(0)-A(15) Address lines AD(0)-AD(7) Address/Data bus ANA(0)-ANA(7) Analog Signal read back bus Attention (GPIB) BOVPROG Buffered OV programming BSTX Buffered secondary transmit Constant Current status CCPROG Constant current programming Constant voltage status CVPROG Constant voltage programming D(0)-D(7)
Page 139: Test Points
Table 6-1. Signal Name Descrptions (continued) Signal Name Description ROM* Read only memory chip select SPCLR Secondary power clear Service request (GPIB) Secondary receive serial data Secondary transmit serial data THERM AMB Ambient temperature THERM HS Heat sink temperature UART* Universal asynchronous receive/transmit chip select signal VMON Voltage monitor...
Page 140 Table 6-3. Test Points .TEST POINT SIGNAL MEASUREMENT AND CONDITIONS NUMBER A2 GPIB BOARD (FIGURE 6-3) Connect meter or scope common to test point when taking measurements at test points through Primary/chassis ground J106-4 + 5 V primary bias + 5V + 0.2V U101-1 PCLR Goes high for approximately 40 ms at power on, then goes...
Page 141 Table 6-3. Test Points (continued) Al MAIN BOARD (FIGURE 6-5, Sheets 1-4) Connect meter or scope common to test point when taking measurements at test points through Secondary common (Sheet 1) -C770 + 5V Secondary bias (Sheet 1) + 5V 0.2V R605 + 15V Secondary bias (Sheet 1)
Page 142 Table 6-3. Test Points (continued) RMOUT (Sheet 2) OV in CV mode - .135V (6651A), - .125V (6652A). - .195V (6653), - .18V R659 (6654A), - .112V (6655) in CC mode IMON (Sheet 2) 0V in CV mode U605-1 NEG IMON (Sheet 2) 0V in CV mode -9.6V in CC mode U609-1...
Page 143 Table 6-3. Test Points (continued) A4A1/A4A3 LEFT TUNNEL BOARDS (FIGURE 6-6) Leave meter or scope common connected to test point when taking measurements at test points through The measurements were taken with full scale voltage and current programmed. The measurements were made first in the CV mode with no load, and then in the CC mode with the load set for full scale voltage and current.
Page 144 Table 6-3. Test Points (continued) A4A2/A4A4 RIGHT TUNNEL BOARDS (FIGURE 6-7) The same measurement conditions apply as were described for the A4Al/A4A3 Left Tunnel Boards. OUTPUT CONTROL 0.03V (6651-54), 0.06 V (6655) in CV mode 0.6V in CC mode U301-3 Stage 1 comparator-input 0.03V (6651-54), 0.06 V (6655) in CV mode 0.06V in CC mode...
Page 145 Figure 6-1. Power Supply Interconnection Diagram for All Models...
Page 146 Figure 6-2. AC Power Distribution Diagram for 655xA & 665xA Models...
Page 147 Figure 6-3. GPIB Board Assembly Diagram (sheet 1 of 2)
Page 149 Figure 6-4. Front Panel Board Assembly Diagram (sheet 1 of 2)
Page 150 Figure 6-4. Front Panel Board Schematic Diagram (sheet 2 of 2)
Page 151 Figure 6-5. A1 Main Board Assembly Diagram and Test Points for 655xA & 665xA Models Only...
Page 152 Figure 6-5. A1 Main Board Assembly Diagram for 654xA & 664xA Models Only...
Page 153 Figure 6-5. A1 Main Board AC Input, Power Rectifier, Bias, and Fan Speed Control Circuits Schematic Diagram for 655xA & 665xA Models Only (sheet 1A)
Page 154 Figure 6-5. A1 Main Board AC Input, Power Rectifier, Bias, and Fan Speed Control Circuits Schematic Diagram for 654xA & 664xA Models Only (sheet 1B)
Page 156 Figure 6-5. A1 Main Board CV/CC Control & Output Bias/Shutdown Circuits Schematic Diagram for 654xA & 664xA Models Only (sheet 2B)
Page 160 Figure 6-6. Left Tunnel Circuits Schematic Diagram for 654xA & 664xA Models Only (sheet 2)
Page 162 Figure 6-7. Right Tunnel Circuits Schematic Diagram for 654xA & 664xA Models Only (sheet 2)
Page 163 REFERENCED TO SUPPLY COMMON 600V ISOLATION REFERENCED TO EARTH GROUND PHONE CONNECTOR PIN DESIGNATIONS Figure 6-8. A2 Isolator Board Assembly and Schematic Diagram for 654xA & 655xA Models Only...
Page 165 Figure 6-9. Power Transformer Wiring Diagram for Models 655xA and 665xA (Sheet 1 of 3) Diagrams 165...
Page 166 Figure 6-9. Power Transformer Wiring Diagram for Models 655xA and 665xA (Sheet 2 of 3) 166 Diagrams...
Page 167 Figure 6-9. Power Transformer Wiring Diagram for Models 655xA and 665xA (Sheet 3 of 3) Diagrams 167...
Page 169: Manual Backdating Changes
Note that several changes may apply to your unit. Model Prefix Serial Change Model Prefix Serial Change 6541A 3215A 00108 6553A 3202A 00103 3215A 00168 3423A 00281...
Page 170 Model Prefix Serial Change Model Prefix Serial Change 6643A 3142A 00106 6653A 3006A 00121 3215A 00121 3020A 00171 8, 14 3236A 00171 3035A 00331 3, 9 3346A 00436 3120A 00381 3501A 00651 3128A 00659 3619A 01146 3136A 00491 12, 13 3216A 00661 6644A...
Page 171 Change Operational amplifier, U605, from OP270 P/N 1826-2252 (Qty 1) to LT 1057 P/N 1826-1845. CHANGE 10 In Table 5-5: Remove heatsink HS600 P/N 1205-0282 (Agilent 6651A only). Remove Capacitor, C646, 47 pf P/N 0160-4805. CHANGE 11 In Table 5-9: Change Optoisolator Ul10, Ul11 (Qty 2) from P/N 1990-0444 to Lead formed P/N 5080-2176.
Page 172 Delete RFI Strip (ref Cover top), p/n 0160-0895. CHANGE 23 In Table 5-7: Change CR701 to CR700, p/n 1884-0349. Also change D691 to D690, p/n 1901-1182 (Agilent 65/6655), p/n 1901-0317 (Agilent 1901-0317). Also, for Agilent models 65/6655A only, change C418 to p/n 0160- 0168.
Page 173: Index
Index Antistatic wrist strap ..............................8 Agilent 3458A system voltmeter ..........................16 Backdating................................8, 172 Basic test setup ................................11 Built-in tests.................................11 Calibration FAC CAL jumper position............................90 INH CAL jumper position ............................90 NORMAL ................................90 SA MODE jumper position ............................90 Calibration, from the front panel ..........................90 Calibration procedures...............................7, 9...
Page 174 DC measurements taking average reading ..............................16 Designators parts ..................................95 Diagrams component location..............................137 I/O interface................................81 overall block ................................84 overall interconnections............................137 use of test points ..............................139 Diagrams, component location ..........................137 Diagrams, detailed block diagram ..........................83 Downprogramming resistors............................88 EEPROM, reprogramming the.............................90 EEPROM, unique programmed data ...........................90 Electronic load................................11 Electrostatic discharge conductive table mat ..............................8...
Page 175 *IDN query ................................8, 41 Index, to power supply assemblies ..........................95 Interface, GPIB communications..........................81 Interface signals, power supply............................81 Isolator board circuits ..............................91 Jumper block, A3J3 ..............................90 LCD display, front panel .............................89 Loads electronic ..................................11 Manual revisions................................8 Manuals operating .................................8 Measurement techniques..............................11 Model differences between Al main board &...
Page 176 Part reference designators............................95 Parts component location diagrams ..........................137 Parts, ordering information ............................95 Performance degradation electrostatic...........................8 Performance test record ...............................11 Performance test record form ............................19 Performance tests.................................11 Power supplies models..................................7 Power supply serial numbers................................8 Power supply assemblies, index to ..........................95 Power supply models ..............................7 Programming current and readback..............................15 from front panel ................................13...
Page 177 Signals +5 V bias voltage..............................91-93 BSTx..................................93 CCPROG ..................................88 CVPROG..................................88 FAN PWM................................89 FAN PWM signal ..............................89 IMON ..................................88 INHIBIT ...................................88 Output Control................................86 OVCMP..................................85 OVPROG..................................85 OVSCR................................85, 88 PCLR ..................................91, 92 +RAIL..................................86 RESET*..................................92 RxD ................................... 91, 93 SPCLR*................................92, 93 SRx ...................................93 TxD..................................91, 93 VMON..................................88 XFMR T1 .................................92 Slew rates..................................11...
Page 178 PARD ..................................14 performance test record ............................11, 19 performance tests ..............................11 setup for most tests ..............................11 transient recovery time..............................15 voltage and current values ............................13 voltage programming and readback accuracy......................13 Tests, power supply abnormal results................................9 built-in ..................................9 performance ................................9 verification..................................9 Transformer, AC input connections...........................137 Transient recovery time ...............................15 Transient response waveform ............................15 Verification, operation tests............................11...
Page 179 Manual Updates The following updates have been made to this manual since its publication date. 8/28/08 The performance test records on pages 20 – 29 have been updated to remove the measurement uncertainties and correct minor discrepancies in the test limits.

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Agilent Technologies 6541A Service Manual

Introduction

Verification

Troubleshooting

Principles of Operation

Replaceable Parts

Diagrams

Manual Backdating Changes

Index

Quick Links

Troubleshooting

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Summary of Contents for Agilent Technologies 6541A

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