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Service Manual
Agilent Model 66332A
Dynamic Measurement DC Source
and Agilent Model 6632B, 6633B, 6634B
System DC Power Supply
For instruments with Serial Numbers:
Agilent 66332A: US37470791 and up
Agilent 6632B: US37471966 and up
Agilent 6633B: US37470746 and up
Agilent 6634B: US37470655 and up
For instruments with higher serial numbers, a change page may be included.
Agilent Part No. 5962-8119 Printed in U.S.A.
Microfiche No 6962-8120 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 13 Operation Verification Tests
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Power-on Self-test Failures 37 CV/CC Status Annunciators Troubleshooting 38 Bias and Reference Supplies 38 J307 Voltage Measurements 39 Manual Fan Speed Control 40 Disabling Protection Features 40 Post-repair Calibration 41 Inhibit Calibration Switch 41 Calibration Password 41 Initialization 42 ROM Upgrade 42 Identifying the Firmware 42 Upgrade Procedure 42 Disassembly Procedures 43 List of Required Tools 43 Cover, Removal and Replacement 44 A2 Interface Board, Removal and Replacement 44 Front
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1 Introduction Organization This manual contains information for troubleshooting and repairing to the component level the Agilent Model 66332A Dynamic Measurement DC Source and the Agilent Model 6632B, 6633B, 6634B 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 Performance tests Chapter 2 Chapter 3 Troubleshooting procedures Chapter 4 Principles of operation on a block-diagram level Chapter 5
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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: 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 hardwar
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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 Resistor 1 ohm, 50 W Ohmite L50J1R0 (substitute for electronic 3 ohm, 100 W (Agilent 66332A/6632B) Ohmite RLS5R0 (adjustable) load if load is too noisy 24 ohm, 100 W (Agilent 6633B) Ohmite RLS25R (adjustable) for CC PARD test) 99 ohm, 100 W (Agilent 6634B) Ohmite RLS100 (adjustable) 1k ohm, 5%, 3W (all models) Agilent 0813-0001 Oscilloscope Sensitivity: 1 mV Agilent 54504A or equivalent Bandwidth Limit: 20 MHz Probe: 1:1 with RF tip RMS Voltmeter True RM
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Verification and Performance Tests - 2 Electronic Load Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable resistor is used, switches should be used to either; connect, disconnect, or short the load resistor. For most tests, an electronic load can be used. The electronic load is considerably easier to use than load resistors, but it may not be fast enough to test transient recovery time and may be too noisy for the noise (PARD)
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2 - Verification and Performance Tests Table 2-2. Programming Ratings Model Voltage Rating Full Scale Rating Current Rating Full Scale Rating Agilent 20 V 20.020 V 5 A 5.0045 A 66332A/6632B 50 V 50.045 V 2 A 2.002 A Agilent 6633B 100 V 100.1 V 1 A 1.001 A Agilent 6634B 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, con
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Verification and Performance Tests - 2 e. Open the load and again record the DVM voltage reading. The difference between the DVM readings in steps (d) and (e) is the load effect voltage, and should not exceed the value listed in the performance test record chart for the appropriate model under CV LOAD EFFECT. 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. T
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2 - Verification and Performance Tests 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. 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 the -S terminals. b. Turn on the supply and program the output voltage to the full-scale value and the current to t
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Verification and Performance Tests - 2 e. 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 that appears on the front panel display. The readings should be within the limits specified in the performance test record card for the appropriate model under CC PROGRAMMING @ FULL-SCALE. Current Sink (-CC) Operation This test verifies current sink operation and readback. a. Turn
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2 - Verification and Performance Tests c. Set up voltmeter to take measurements in the statistical mode as follows: Press Shift key, f0, Shift key, N Press ^ (up arrow) until MATH function is selected, then press >. Press ^ (up arrow until STAT function is selected then press (ENTER). d. Set up voltmeter to read the average of the measurements as follows: Press Shift key, f1, Shift key, N. Press down arrow until RMATH function is selected, then press >. Press ^ (up arrow) until MEAN function is
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Verification and Performance Tests - 2 CC Noise (PARD) Periodic and random deviations (PARD) in the output combine to produce a residual ac current, as well, as an ac voltage superimposed on the dc output. Constant current (CC) PARD is specified as the rms output current in a frequency range 20 Hz to 20 Mhz with the supply in CC operation. a. Turn off the supply and connect the load, monitoring resistor, and rms voltmeter across the monitoring resistor as shown in Figure 2-1a. The Current Monito
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2 - Verification and Performance Tests Performance Test Record Forms Model Agilent 66332A OR Report No _______________ Date __________________ Agilent6632B Test Description Minimum Results* Maximum Measurement Specs. Specs. Uncertainty Constant Voltage Tests Voltage Programming and Readback Low Voltage (0V) Vout − 10 mV __________ + 10 mV 1.6 µ V Front Panel Display Readback __________ Vout + 3 mV Vout − 3 mV 1.6 µ V High Voltage (Full Scale) Vout __________ 20.020 V 19.980 V 335 µ V F
