Agilent 5962-8200 - Manual

9 1 Introduction Organization This manual contains information for troubleshooting and repairing Agilent Models 6611C, 6612C, 6613C and6614C System DC Power Supplies. Hereafter all models will be referred to as the dc power supply. This manual is organized as follows: Chapter 1 Organization Chapter ...

1 - Introduction 10 Revisions Manual Revisions This manual was written for dc power supplies that have the same manufacturing dates (the first four digits) as thoselisted on the title page and whose unique identification number (the last four digits) are equal to or higher than thoselisted in the ti...

11 2 Verification and Performance Tests Introduction This document contains test procedures to verify that the dc power supply is operating normally and is withinpublished specifications. There are three types of tests as follows: Built-in Self Tests These tests, run automatically when the power sup...

2 - Verification and Performance Tests 12 Table 2-1. Test Equipment Required for Verification and Performance Tests Type Specifications Recommended Model Current Monitor Resistor 15 A (0.1 ohm) 0.04% Guildline 9230/15 DC Power Supply Minimum 5 A output current rating Agilent 6632B Digital Voltmeter ...

Verification and Performance Tests - 2 13 Figure 2-1. Test Setup Electronic Load Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variableresistor is used, switches should be used to either; connect, disconnect, or short the load resistor...

2 - Verification and Performance Tests 14 Current-Monitoring Resistor To eliminate output-current measurement error caused by voltage drops in the leads and connections, connect thecurrent monitoring resistor between the -OUT and the load as a four-terminal device. Connect the current-monitoringlead...

Verification and Performance Tests - 2 15 Constant Voltage (CV) Tests CV Setup If more than one meter or if a meter and an oscilloscope are used, connect each to the terminals by a separate pair ofleads to avoid mutual coupling effects. For constant voltage dc tests, connect only to +S and -S, since...

2 - Verification and Performance Tests 16 CV Source Effect This test measures the change in output voltage that results from a change in ac line voltage from the minimum tomaximum value within the line voltage specifications. a. Turn off the supply and connect the ac power line through a variable vo...

Verification and Performance Tests - 2 17 tttt t v LoadingTransient Unloading Transient v t Figure 2-2. Transient Waveform a. Turn off the supply and connect the output as in Figure 2-1a with the oscilloscope across the +S and -Sterminals. b. Turn on the supply and program the output current to the ...

2 - Verification and Performance Tests 18 c. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert toamps and record this value (Iout). Also, record the current reading on the front panel display. The readingsshould be within the limits specified i...

Verification and Performance Tests - 2 19 CC Load and Line Regulation These tests (CC Load Effect and CC Source Effect given below) are tests of the dc regulation of the power supply'soutput current. To insure that the values read are not the instantaneous measurement of the ac peaks of the outputcu...

2 - Verification and Performance Tests 20 CC Source Effect This test measures the change in output current that results when the AC line voltage changes from the minimum tothe maximum value within the specifications. a. Turn off the supply and connect the ac power line through a variable voltage tra...

Verification and Performance Tests - 2 21 Performance Test Equipment Form Test Facility: _________________________ Report Number ________________________ ____________________________________ Date _________________________________ ____________________________________ Customer ________________________...

2 - Verification and Performance Tests 22 Performance Test Record Form Model Agilent 6611C Report No _______________ Date __________________ Test Description Minimum Specs. Results* Maximum Specs. Measurement Uncertainty Constant Voltage Tests Voltage Programming and Readback Low Voltage (0V) Vout F...

27 3 Troubleshooting Introduction WARNING: SHOCK HAZARD. Most of the troubleshooting procedures given in this chapter are performed with power applied and protective covers removed. Such maintenance shouldbe performed only by service trained personnel who are aware of the hazards (forexample, fire a...

3 - Troubleshooting 28 Test Equipment Required Table 3-1 lists the test equipment required to troubleshoot the power supply. Recommended models arelisted. Table 3-1. Test Equipment Required for Troubleshooting Type Purpose Recommended Model GPIB Controller To communicate with the supply via theGPIB ...

Troubleshooting - 3 33 Specific Troubleshooting Procedures Power-on Self-test Failures The power-on self-test sequence tests most of the digital and DAC circuits. If the supply fails self-test, thedisplay "ERR" annunciator will come on. You can then query the unit to find out what the error(...

Troubleshooting - 3 35 J307 Voltage Measurements Cable W9 connects J307 of the A1 Main Board Assembly to J207 of the A2 Interface Assembly. Table 3-4provides a quick method of determining if the voltages between these assemblies are within the normalrange. If any of these voltages is outside the nor...

Troubleshooting - 3 37 Post-repair Calibration Calibration is required annually and whenever certain components are replaced. If either A1 or A2 arereplaced, the supply must be re-calibrated as described in Appendix B of the User's Guide. If the Interface board A2 is replaced, the supply must be ini...

3 - Troubleshooting 38 Initialization The dc power supply's GPIB address and model number as well as other constants which are required toprogram and calibrate the supply are stored in a EEPROM on the A2 Interface board. The Interface boardalso contains references and other components that will affe...

Troubleshooting - 3 39 Disassembly Procedures The following paragraphs provide instructions on how to disassemble various components of the dc powersupply. Once disassembled, the components can be reassembled by performing the disassemblyinstructions in reverse order. Figure 3-2 shows the location o...

3 - Troubleshooting 40 Cover, Removal and Replacement a. Using a T15 Torx screwdriver, unscrew the two captive screws which hold the rear bezel to the dcpower supply, and then remove the two screws from the bottom of the case. b. Slide the cover backward until it clears the rear of the power supply....

Troubleshooting - 3 41 A3 Front Panel Board, Removal and Replacement First remove the front panel assembly as described under, "Front Panel Assembly, Removal andReplacement." Once you have access to the front panel board perform these steps: a. Remove the RPG knob by pulling it away from the...

3 - Troubleshooting 42 Line Voltage Wiring Figure 3-3 illustrates the primary wiring configuration of the power transformer for various ac line voltages.Use long nose pliers to disconnect the wires going to the transformer terminals. NOTE: Install the correct fuse when changing the ac line voltage f...

43 4 Principles of Operation Introduction This section describes the different functional circuits used in the dc power supply. First, the I/O externalsignals that connect to the Agilent power supply are described. Next, the overall block diagrams for thedc power supply are described in detail. The ...

4 - Principles of Operation 44 A3 Front Panel Circuits As shown in Figure 6-3, the supply's front panel assembly contains a circuit board, a keypad, a display, anda rotary control (RPG) for the output voltage and current. With the exception of the RPG (A3G1), the A3Front Panel board is an assembly-l...

Principles of Operation - 4 45 The EEPROM (electrically erasable programmable read-only memory) chip on the A2 interface boardstores a variety of data and configuration information. This information includes calibration constants,GPIB address, present programming language, and model-dependent data, ...

4 - Principles of Operation 46 As shown in Figure 6-2, the ac input rectifier and filter converts ac input to a dc level. The output regulatorregulates this dc level at the output of the power supply. The output regulator stage consists of two parallelNPN series regulators mounted on a heatsink and ...

49 5 Replaceable Parts List Introduction This section lists the replaceable parts for all models. Refer to Figures 5-1 and 5-2 for thelocation of mechanical parts with the reference designators MP. Table 5-1. Chassis, Electrical Designator Part_Number Qty Description A1 06611-61024 1 6611C Control P...

5 - Replaceable Parts List 50 W-3 5063-4825 1 Secondary Power Cable (T1 to J306) W-4 5063-3479 1 Secondary Bias Cable (T1 to J305) W-5 5063-3481 1 Output Cable (EB315/ER315 to front panel) W-6 5063-3478 1 Primary Bias Cable (T1 to J303) W-7 5080-2544 1 Display Power/Comm Cable (A2 to A3) W-8 5080-24...

Replaceable Parts List - 5 51 Figure 5-1. Mechanical Parts Identification

53 6 Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining the Agilent Model6611C, 6612C, 6613C and 6614C System DC Power Supplies. Figure 6-1. A1 Board Component and Test Point Locations S e c C o mmo n -Ra il +Ra il J307 + 15Vs -15Vs +5 V s F310 R4 3...

57 Index —+— +OUT, 43+sense, 43 —A— A1 block diagram , 54 A1 board removal, 41A1 Main board, 45 A1 test point locations , 53 A2 board removal, 40A2 Interface Board, 44 A2/A3 block diagram , 55 A2S201 , 45 A3 board removal, 41A3 Front Panel, 44ADC, 44 —B— bias voltages, 34, 35 —C— cal denied, 37calib...