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Service Manual
For Agilent Model
6611C, 6612C, 6613C, 6614C
System DC Power Supply
For instruments with Serial Numbers:
Agilent 6611C: US37450101 and up
Agilent 6612C: US37460101 and up
Agilent 6613C: US37460101 and up
Agilent 6614C: US37460101 and up
Agilent Part No. 5962-8200 Printed in U.S.A.
Microfiche No 5962-8201 September, 2000
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Warranty Information 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. WARRANTY This Agilent Technologies hardware product is wa
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Safety Summary The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the customer's failure to comply with these requirements. WARNING Servicing instructions are for use by service-trained personnel. To avoid dangerous el
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Safety Symbol Definitions Symbol Description Direct current Alternating current Both direct and alternating current Three-phase alternating current Earth (ground) terminal Protective earth (ground) terminal Frame or chassis terminal Terminal is at earth potential (Used for measurement and control circuits designed to be operated with one terminal at earth potential.) Terminal for Neutral conductor on permanently installed equipment Terminal for Line conductor on permanently installed equipment O
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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. Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance or use of this material. This document contains proprietary i
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Table of Contents Warranty Information 2 Safety Summary 3 Notice 4 Printing History 5 Instrument Identification 5 Table of Contents 6 INTRODUCTION 9 Organization 9 Safety Considerations 9 Related Documents 9 Revisions 10 Manual Revisions 10 Firmware Revisions 10 Electrostatic Discharge 10 VERIFICATION AND PERFORMANCE TESTS 11 Introduction 11 Test Equipment Required 11 Measurement Techniques 12 Setup for Most Tests 12 Electronic Load 13 Current-Monitoring Resistor 14 Operation Verification Tests
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CV/CC Status Annunciators Troubleshooting 34 Bias and Reference Supplies 34 J307 Voltage Measurements 35 Manual Fan Speed Control 36 Disabling Protection Features 36 Post-repair Calibration 37 Inhibit Calibration Switch 37 Calibration Password 37 Initialization 38 ROM Upgrade 38 Identifying the Firmware 38 Upgrade Procedure 38 Disassembly Procedures 39 List of Required Tools 39 Cover, Removal and Replacement 40 A2 Interface Board, Removal and Replacement 40 Front Panel Assembly, Removal and Rep
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1 Introduction Organization This manual contains information for troubleshooting and repairing Agilent Models 6611C, 6612C, 6613C and 6614C 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 2 Performance tests Troubleshooting procedures Chapter 3 Chapter 4 Principles of operation on a block-diagram level Chapter 5 Replaceable parts Chapter 6 Diagrams Safety Considerations WARNING: Hazard
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1 - Introduction Revisions Manual Revisions This manual was written for dc power supplies that have the same manufacturing dates (the first four digits) as those listed on the title page and whose unique identification number (the last four digits) are equal to or higher than those listed in the title page. NOTE: 1) If the first four digits of the serial number of your unit are higher than those shown in the title page, your unit was made after the publication of this manual and may have hard
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2 Verification and Performance Tests Introduction This document contains test procedures to verify that the dc power supply is operating normally and is within published specifications. There are three types of tests as follows: Built-in Self Tests These tests, run automatically when the power supply is turned on, check most of the digital circuits and the programming and readback DACs. Operation Verification These tests verify that the power supply is probably operating normally but do not chec
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2 - Verification and Performance Tests 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 Resolution: 10 nV @ 1V Agilent 3458A or equivalent Readout: 8 1/2 digits Accuracy: 20 ppm Electronic Load 100V, 5 A minimum, with transient capability Agilent 6060B (60V max.), 6063B (240V) or equivale
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Verification and Performance Tests - 2 SENSE SENSE -S - + +S -S - ++S Local Local Remote Remote NOTE: Connector is removable + 50VDC MAX TO + - 50VDC MAX TO - Set to Set to Remote Remote - - DVM, Scope, or DC Load resistor RMS voltmeter Ampmeter 400 ohm + (for CV tests) + B. - DVM or Current RMS voltmeter SENSE monitor -S -+ +S Local Remote (for CC tests) + + 50VDC MAX TO - Set to -+ Remote Electronic - Load DC Load resistor (see note) Ampmeter 400 ohm + Note: Use dc supply with same polarity +
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2 - Verification and Performance Tests Current-Monitoring Resistor To eliminate output-current measurement error caused by voltage drops in the leads and connections, connect the current monitoring resistor between the -OUT and the load as a four-terminal device. Connect the current-monitoring leads inside the load-lead connections directly at the monitoring points on the resistor element. Operation Verification Tests To assure that the supply is operating properly, without testing all specified
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Verification and Performance Tests - 2 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 of leads to avoid mutual coupling effects. For constant voltage dc tests, connect only to +S and -S, since the unit regulates the output voltage that appears between +S and -S, and not between the (+) and (-) output terminals. Use coaxial cable or shielded two-wire cable to avoid noise pickup on the test le
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2 - Verification and Performance Tests CV Source Effect This test measures the change in output voltage that results from a change in ac line voltage from the minimum to maximum value within the line voltage specifications. a. Turn off the supply and connect the ac power line through a variable voltage transformer. b. Connect the output as shown in Figure 2-1a with the DVM connected between the +S and the -S terminals. Set the transformer to nominal line voltage. c. Turn on the supply and progra
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Verification and Performance Tests - 2 Loading tttt Transient t v v t Unloading Transient 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 -S terminals. b. Turn on the supply and program the output current to the maximum programmable value (Imax) and the voltage to the full-scale value in Table 2-2. c. Set the load to the Constant Current mode and program the load current to 1/2 the power supply full-scale rate
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2 - Verification and Performance Tests c. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert to amps and record this value (Iout). Also, record the current reading on the front panel display. The readings should be within the limits specified in the performance test record card for the appropriate model under Current Programming and Readback @ 0 Amps. d. Program the output current to the full-scale value in Table 2-2. e. Divide the voltage d
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Verification and Performance Tests - 2 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's output current. To insure that the values read are not the instantaneous measurement of the ac peaks of the output current ripple, several dc measurements should be made and the average of these readings calculated. An example of how to do this is given below using an Agilent 3458A System Voltmeter programmed from t
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2 - Verification and Performance Tests CC Source Effect This test measures the change in output current that results when the AC line voltage changes from the minimum to the maximum value within the specifications. a. Turn off the supply and connect the ac power line through a variable voltage transformer. b. Connect the output terminals as shown in Figure 2-1a with the DVM connected across the current monitoring resistor. Set the transformer to the nominal line voltage. c. Turn on the supply a
