Agilent Technologies 6610XA User Manual

SERVICE GUIDE

for Agilent 6610xA

Power Modules

Serial Numbers:

Agilent Model 66101A: US34440101 and up Agilent Model 66102A: US34210101 and up Agilent Model 66103A: US34210101 and up Agilent Model 66104A: US34450101 and up Agilent Model 66105A: US34210101 and up Agilent Model 66106A: US34210101 and up

For instruments with higher serial numbers, a change page may be included.

For instruments with lower serial numbers, refer to Appendix A.

Agilent Part No. 5959-3364 Printed in USA Microfiche Part No. 5959-3365 Update: June, 2000

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 warranted against defects in material and workmanship for a period of three years from date of delivery. Agilent software and firmware products, which are designated by Agilent Technologies for use with a hardware product and when properly installed on that hardware product, are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery. During the warranty period Agilent Technologies will, at its option, either repair or replace products which prove to be defective. Agilent Technologies does not warrant that the op eration of the software, firmware, or hardware shall be uninterrupt ed or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility designated by Agilent Technologies. Customer shall prepay shipping charges (and shall pay all duty and taxes) for products returned to Agilent Technologies for warranty service. Except for products returned to Customer from another country, Agilent Technologies shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent Technologies ’ product price, only if Customer pays Agilent Technologies international prices (defined as destination local currency price, or U.S. or Geneva Export price).

If Agilent Technologies 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.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER’S SOLE AND EXCLUSIVE REMEDIES. AGILENT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

The above statements apply only to the standard product warranty. Wa rranty options, extended support contracts, product maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent Technologies Sales and Service office for further information on Agilent Technologies’ full line of Support Programs.

SAFETY SUMMARY

The following general safety precautions must be obser ved during all phas es of oper ation of this power module. Failure to comply with these precautions or with specific warnings elsewhere in this guide violates safety standards of design, manufacture, and intended use of the power module. Agilent Technologies assumes no liability for the user’s failure to comply with these requirements.

GROUND THE POWER MODULE.

When installed in a properly wired mainframe, this product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the mainframe must be connected to an electrical ground. The mainframe must be connected to the a c power supply mains through a three-conductor power cable , with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.

DO NOT EXCEED INPUT RATINGS.

The mainframe is equipped with a power line filter to reduce electromagnetic interference and must be connected to a properly grounded receptacle to minimize electric shock hazard. Operation at line voltages or frequencies in excess of those stated on the line rating label may cause leakage currents in excess of 5.0 mA peak.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.

Do not operate the power module in the presence of flammable gases or fumes.

BEFORE APPLYING POWER.

Verify that the power module line voltage switch is set to match the available line voltage.

SAFETY SYMBOLS.

Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual (refer to Table of Contents) .

Indicates hazardous voltages. Indicate earth (ground) terminal.

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

Power modules that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel.

Printing History

The current edition of this guide is indicated belo w. Reprints of this guide containing minor corrections and updates may have the same printing date. New editions are identified by a new printing date and, in some cases, by a new part number. A new edition incorporates all new or corrected material since the previous edition. Changes to the guide occurring between editions are covered by change sheets shipped with this guide. Also, if the serial number prefix of your power module is higher than those listed on the title page of this guide, then it may or may not include a change sheet. That is because even though the higher serial prefix indicates a design change, that change may not affect the content of the guide.

Edition 1 . . . . October, 1993 (Agilent Model 6610xA)

Update . . . . . June, 2000



This document contains proprietary information protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced, or translated into another language without pr ior consent of Agilent Techno logies The information contained in this document is subject to change without notice.

Overview.................................................................................................................................................................................. 7

About This Manual............................................................................................................................................................... 7

Related Documents........................................................................................................................................................... 8

Revisions and Updates.......................................................................................................................................................... 8

Manual.............................................................................................................................................................................. 8

Firmware........................................................................................................................................................................... 8

Safety Considerations........................................................................................................................................................... 9

Electrostatic Discharge......................................................................................................................................................... 9

Service Tools and Equipment............................................................................................................................................... 9

Verification and Performance Tests....................................................................................................................................11

Operation Verification Tests...............................................................................................................................................11

Performance Tests..............................................................................................................................................................11

Measurement Techniques............................................................................................................................................... 12

Setup for Most Tests................................................................................................................................................... 12

Current-Monitoring Resistor....................................................................................................................................... 12

Programming.................................................................................................................... .............................................. 12

Constant Voltage (CV) Tests.......................................................................................................................................... 13

CV Setup.....................................................................................................................................................................13

Voltage Programming/Readback Accuracy................................................................................................................13

CV Load Effect........................................................................................................................................................... 13

CV Source Effect........................................................................................................................................................ 14

CV Noise (PARD)...................................................................................................................................................... 14

Transient Recovery Time............................................................................................................................................14

Constant Current (CC) Tests........................................................................................................................................... 15

CC Setup..................................................................................................................................................................... 15

Current Programming/Readback Accuracy................................................................................................................. 15

CC Load and Line Regulation .................................................................................................................................... 15

CC Load Effect........................................................................................................................................................... 16

CC Source Effect........................................................................................................................................................ 16

CC Noise (PARD)......................................................................................................................................................17

Troubleshooting.................................................................................................................................................................... 25

Troubleshooting Sequence..................................................................................................................................................25

Accessing the Flowcharts.................................................................................................................................................... 25

If You Experienced a Selftest Failure or RunTime Error Message................................................................................. 26

If You Experienced Other Problems With the Module................................................................................................... 26

Test Points..........................................................................................................................................................................48

Built-In Test Functions....................................................................................................................................................... 48

EEPROM Troubleshooting and Initialization.....................................................................................................................51

Troubleshooting.............................................................................................................................................................. 51

Initialization.................................................................................................................................................................... 51

Disassembly Procedures..................................................................................................................................................... 56

Removing the Module and Module Connector............................................................................................................... 56

Removing the Cover.......................................................................................................................................................56

Removing the Fan........................................................................................................................................................... 56

Removing the Front Panel Assembly..............................................................................................................................57

Removing the Power Board............................................................................................................................................ 57

Removing the Bias Board............................................................................................................................................... 57

Removing the Front Panel Board.................................................................................................................................... 57

Installing the Power Board.............................................................................................................................................58

Installing the Bias Board ................................................................................................................................................58

Installing the Front Panel Board and Front Panel Assembly.......................................................................................... 59

Installing the Fan............................................................................................................................................................59

Installing the Cover.........................................................................................................................................................59

Theory of Operation............................................................................................................................................................. 61

AC Input and Bias Supplies................................................................................................................................................ 61

Microprocessor Circuits......................................................................................................................................................61

CV/CC DACs.....................................................................................................................................................................61

CV Amplifier...................................................................................................................................................................... 63

CC Amplifier...................................................................................................................................................................... 63

OR Gates ............................................................................................................................................................................ 63

Pulse-Width Modulator, FETS, and Isolation Transformer................................................................................................ 64

Downprogrammer Circuit................................................................................................................................................... 64

Readback Multiplexer......................................................................................................................................................... 64

OV Circuit..........................................................................................................................................................................65

Replacement Parts................................................................................................................................................................67

Diagrams ............................................................................................................................................................................... 83

Schematic Sheets................................................................................................................................................................ 83

Component Location Diagrams.......................................................................................................................................... 83

Schematic Notes.................................................................................................................................................................84

Manual Backdating............................................................................................................................................................ 97

Index.................................................................................................................................................................................... 99

Overview

About This Manual

This manual is a complete guide for servicing the Agilent 6610xA Power Modules. Troubleshooting information for the Agilent 66000A MPS Mainframe is provided in the mainframe service manual (see "Related Documents"), which should be used with this manual.

Note Troubleshooting the Agilent 6610xA Power Modules requires the use of one working Agilent 66000A

MPS Mainframe.

This manual is organized into the following major sections:

■ Overview discusses safety and equipment considerations to be aware of when troubleshooting. It also lists the tools and

equipment required for troubleshooting.

■ Verification and Performance consists of a series of tests that are used to verify....

■ Troubleshooting procedures systematically verify selected circuits to isolate the cause of a problem. Suggestions fo r

remedying the problem are also provided. The following troubleshooting procedures are provided:

❏ Overall ❏ Microprocessor ❏ Error Messages ❏ Overvoltage Circuit ❏ Output Circuit ❏ CV and CC Circuits ❏ Downprogrammer Circuits ❏ DAC Circuit ❏ Readback Circuit

Disassembly procedures are provided at the end of the chapter.

■ Theory of Operation provides a brief description of the overall operation of the power module.

■ Replacement Parts lists part numbers for electrical components and miscellaneous chassis parts.

■ Schematics and component location diagrams are provided as an aid in troubleshooting and repair.

Overview

Revisions and Updates

66000-90001 Provides product specifications, installation, and

5959-3386

5959-3362

66000-90003 Provides replaceable-parts lists, circuit diagrams, and

Description

connection information.

Describes the operation of the MPS Power Modules.

Describes SCPI programming commands, status

reporting.

verification procedures for the Agilent Series 66000A MPS Mainframe.

Manual

Agilent Technologies instruments are identified by a two-part, ten-character serial number, such as 3246A-00517. The first five characters (e.g. 3246A) are the serial prefix, which is the same for all identically made instruments. The last five digits (e.g. 00517) are a unique serial number assigned to each instrument. If a significant design change is made, the prefix changes but the last five numbers co ntinue in sequence.

This manual applies to Agilent 6610xA Power Modules with the same serial prefixes and serial numbers equal to or higher than the ones shown on the title page. If the prefix number on your power module is higher than the one on the title page, then the module was made after publication of the manual and may have hardware and/or firmware differences not covered in the manual. If there are such differences, they are documented in one or more "Manual Changes" sheets sent with the manual.

If the prefix number on your power module is lower than the one on the title page, then the module was made before the publication of the manual and may have differences not covered in the manual. These differences are documented in appendix A.

Firmware

This manual applies to p ower modules that run on software revision A.00.01 through A.00.04. Firmware revision A.00.04 is backward compatible with all previous revisions. The ROM chip (U2) has a label that specifies the firmware revision.

Overview

Safety Considerations

The Agilent 6610xA Power Modules are Safety Class 1 instruments that connect to a protective earth terminal when properly installed in an Agilent 66000A MPS Mainframe. Refer to the Safety Summary page at the beginning of this manual for general safety procedures and the meaning of safety symbols appearing in the manual and on the module.

Electrostatic Discharge

The Modular Power System has components that can be damaged by ESD (electrostatic discharge).

when complete failure does not occur.

When working on the Modular Power System, observe all anti-static work practices. This includes, but is not limited to:

■ Working at a static-free station, such as a table covered with static-dissipative laminate or with a conductive table mat

(Agilent p/n 9300-0797).

■ Using a conductive wrist strap (Agilent p/n 9300-0969 or 9300-0970).

■ Grounding all metal equipment at the station to a single, common ground.

■ Connecting low-impedance test equipment to static sensitive components only when those components have power

applied to them.

■ Removing power from the Modular Power System before removing or installing printed circuit boards.

Failure to observe standard anti-static practices can result in serious degradation of performance even

Service Tools and Equipment

The following tools are required to repair the Agilent 6610xA MPS Modules:

■ T10 TORX driver

■ 7mm HEX NUT drivers

■ #2 POZI driver

■ Slot-head screwdriver - medium

■ DIP component removal tool

■ Soldering iron and solder

■ De-solder removal tool

■ Needle-nose pliers

■ Anti-static work mat and wrist strap

Overview

The following equipment is required to verify and troubleshoot the Agilent 6610xA Power Modules:

Table 1-1. Service Test Equipment

Equipment Required Critical Specifications Recommended Model Use

GPIB Controller Full GPIB capabilities HP Series 200/300 computer T

Oscilloscope Sensitivity: 1mV

Agilent 54504A T Bandwidth Limit: 20MHz Probe: 1:1 with RF tip

Rms Voltmeter True RMS Band width: 20MHz

Agilent 3400B T Sensitivity: 100µV

Digital Voltmeter Resolution: 10nV @ 1V (8 1/2 digit) Agilent 3458A Accuracy: 20 ppm V,T

Variable Voltage Transformer

CC RMS Noise Resistor (R

)

Electronic Load Voltage and current range must exceed range

Adjustable from- 13% to + 6% of input range. 1KVA min.

Agilent 66101A,102A - 100A (.01 Ω)

0.04% Agilent 66103A,106A - 15A (.01 Ω)

0.04%

of module under test. Power Range: 600W minimum

Guildline 9230/100

V,T

Guildline 9230/15

Agilent 6050A Load mainframe

V,T and Agilent 60503A module (240V) or Agilent 60507A module (120V).

Load Resistor (RL)

Agilent 66101A- 0.1 Ω ± 5% 300W Agilent 66102A-106A- 1.0 Ω ± 5% 300W

Ohmite C300KR10 Ohmite C300KIR0 T

MPS Mainframe Agilent 66000A V,T

MPS Keyboard

Agilent 66001A V,T

1 V = Verification; T = Troubleshooting. 2 Guildline Shunt Accuracy determined by Power Coefficient ( ± 0.01% + (0.0004%/watt)) 3 Guildline Shunt Accuracy determined by Power Coefficient ( ± 0.01% + (0.002%/watt)) 4 Use of the keyboard is recommended for displaying selftest error messages.

Overview

Verification and Performance Tests

This chapter contains test procedures to check the operation of the Agilent 6610xA Power Modules. The required test equipment is specified in Chapter 1. Sample performance test record sheets are included at the end of the chapter. Instructions are given for performing the tests either from a GPIB controller or the MPS keyboard. Two types of procedures are provided: Operation Verification tests and Performance tests.

Operation Verification

Performance

If you encounter failures or out-of-specification test results, see "Troubleshooting Pr ocedures" in Chapter 3 of this manual. Those procedures will determine if repair and/or calibration is required.

These tests do not check all parameters, but comprise a short procedure to verify that the power module is performing properly.

These test all the Performance Specifications (not Supplementary Characteristics) listed in Table 1-1 of the Power Module User’s Guide.

Note The power module must pass the selftest at power-on before the following tests can be performed. If the

module fails selftest, refer to the overall troubleshooting procedures in Chapter 3.

SHOCK HAZARD The tests should only be performed by qualified personnel. During the performance of these tests, hazardous voltages may be present at the output of the module.

Operation Verification Tests

To assure that the module is operating properly, without testing all specified parameters, perform the following test procedures:

1. Perform the turn-on and checkout procedures given in Chapter 3 of the Power Module User’s Guide.

2. Perform the Voltage Programming/Readback Accuracy and the Current Programming/Readback Accuracy Performance

Tests in this chapter.

Performance Tests

The following paragraphs provide test procedures for verifying the module’s compliance with the specifications listed in Table 1-1 of the Power Module User’s Guide. All of the performance test specifications are listed in the Performance Test Records at the end of this chapter. You can record the actual measured values in the column provided.

Verification and Performance Tests 11

Measurement Techniques

Setup for Most Tests

Most tests are performed at the rear terminals as shown in the following figure. Measure the dc voltage directly at the + S and - S terminals. Set the connector sense switch for local sensing and use adequate wire gauge for load leads as described in Chapter 2 of the Power Module User’s Guide.

Figure 2-1. Performance Test Setup

Many of the test procedures require the use of a variable load capable of dissipating the required power (see Table 1-1). If a variable resistor is used, switches must be used to connect, disconnect, and 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 some may not be fast enough to test transient recove ry time and may be too noisy for the noise (PARD) tests. Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures in this chapter. Also, if computer controlled test setups are used, the relatively slow (compared to computers and system voltmeters) settling time and slew rates of the power module may have to be taken into account. WAIT statements can be used in the test program if the test system is faster than the module.

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 output and the load as a four-terminal device (see R monitoring leads inside the load lead connections directly at the monitoring points on the resistor element.

in Figure 2-1). Connect the current

Programming

Table 2-1 lists the programming and current values for each module. You may program the module from the MPS Keyboard or from a GPIB controller when performing the tests. The test procedures are written assuming that you know how to do either or both. Complete instructions for remote and local programming are given in the module Power Module Programming Guide and Power Module User’s Guide.

12 Verification and Performance Tests

Table 2-1. Power Module Voltage and Current Values

Agilent

Model

66101A 8V 8.190V 16A 16.380A 10V 66102A 20V 20.475V 7.5A 7.678A 24V 66103A 35V 35.831V 4.5A 4.607A 42V 66104A 60V 61.425V 2.5A 2.559A 72V 66105A 120V 122.85V 1.25A 1.280A 144V 66106A 200V 204.75V 0.75A 0.768A 240V

Full-Scale

Voltage

Max. Prog.

Voltage

Full-Scale

Current

Max. Prog.

Current

Max. Prog.

Overvoltage

Constant Voltage (CV) Tests

CV Setup

If more than one meter or 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 because the module regulates the output voltage that appears between those terminals, not between the + and - output terminals. Use coaxial cable or shielded 2-wire cable to avoid noise pickup on the test leads.

Voltage Programming/Readback Accuracy

This test verifies that the voltage programming, readback, and front panel display functions are within specifications. Note that the values read back over the GPIB should be identical to those displayed on the keyboard display.

1. Turn off the power module and connect a digital voltmeter between the + S and--S terminals (see Figure 2-1).

2. Turn on the module and program it for zero volts and the maximum programmable current (see Table 2-1) with the load

off.

3. Record the output voltage readings on the DVM and the keyboard display. The readings should be within the limits

specified in the Performance Test Record Tables under CV PROGRAMMING @ 0 VOLTS, for the particular model being tested. The CV annunciator should be on and the output current reading should be approximately zero.

4. Program the output voltage to full scale (see Table 2-1).

5. Record the output voltage readings on the DVM and the keyboard display. The readings should be within the limits

specified in the Performance Test Record Tables under CV PROGRAMMING @ FULL SCALE, for the particular model being tested.

CV Load Effect

This test measures the change in output voltage resulting from a change in output current from full-load to no-load.

1. Turn off the module and connect the output as shown in Figure 2-1 with the DVM connected between the + S and - S

terminals.

2. Turn on the module and program the current to the maximum programmable value and the voltage to the full-scale

value (see Table 2-1).

3. Adjust the load for the full-scale current (see Table 2-1) as indicated on the keyboard display. The front panel CV

annunciator must be on. If it is not, ad just the load so that the output c urrent drops slightly until the annunciator comes on.

4. Record the output voltage reading on the DVM connected to + S and - S.

5. Open the load and again record the DVM voltage reading.

6. The difference between the DVM readings in steps (4) and (5) is the load effect voltage and should not exceed the

value listed in the Performance Test Record Tables under CV LOAD EFFECT, for the model being tested .

Verification and Performance Tests 13

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.

1. Turn off the module and c onnect the ac power line through a variable-voltage tr ansformer.

2. Connect the output as shown in Figure 2-1 with the DVM connected between the + S and - S terminals. Set the

transformer to nominal line voltage (either 115Vac or 230Vac).

3. Turn on the module and program the current to the maximum programmable value and the output voltage to the

full-scale value (see Table 2-1).

4. Adjust the load for the full-scale current value (see Table 2-1) as indicated on the keyboard display. The front panel CV

annunciator must be on. If it is not, ad just the load so that the output c urrent drops slightly until the annunciator comes on.

5. Adjust the transformer to the LOW line voltage (e.g., 87Vac for a 115Vac nominal input, or 174Vac for a 230Vac

nominal input).

6. Record the output voltage reading on the DVM.

7. Adjust the transformer to the HIGH line voltage (e.g., 132Vac for a 115Vac nominal input, or 250Vac for a 230Vac

nominal input).

8. Record the output voltage reading on the DVM.

9. The difference between the DVM readings in steps (6) and (8) is the source effect voltage and should not exceed the

value listed in the Performance Test Record Tables under CV SOURCE EFFECT, for the model being tested.

CV Noise (PARD)

Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac voltage superimposed on the dc output voltage. This test measures CV PARD, specified as the rms or peak-to-peak output voltage over the frequency range of 20Hz to 20MHz.

1. Turn off the module and connect the output as shown in Figure 2-1 to an oscilloscope (ac coupled) between the + and--

terminals. Set the oscilloscope’s bandwidth limit to 20MHz (30MHz on the Agilent 54504A) and use an RF tip on the oscilloscope probe.

2. Turn on the module and program the current to the maximum programmable value and the output voltage to the

full-scale value (see Table 2-1).

3. Adjust the load for the full-scale current value (see Table 2-1) as indicated on the keyboard display.

4. The waveform on the oscilloscope should not exceed the peak-to-peak limits in the Performance Test Record Tables

under CV NOISE (PARD), for the model being tested.

5. Disconnect the oscilloscope and connect an ac rms voltmeter in its place. The rms voltage reading should not exceed

the rms limits in the Performance Test Record Tables under CV NOISE (PARD) for the model being tested.

Transient Recovery Time

This test measures the time for the output voltage to recover to within the specified value following a 10% change in the load current.

1. Turn off the module and connect the output as shown in Figure 2-1 with the oscilloscope across the + S and -S

terminals.

2. Turn on the module and program the output voltage to the full-scale value and the current to the maximum

programmable value (see Table 2-1).

3. Set the load to the Constant Current mode and program the load current to 90% of the power module full-scale rated

current.

4. Set the electronic load’s transient generator frequency to 100Hz and its duty cycle to 50%.

5. Program the load’s transient level to the module’s full-scale current value and turn the transient on.

6. Adjust the oscilloscope for a waveform similar to that in Figure 2-2.

7. The output voltage should return to within 100mV of the nominal value in less than 1ms. Check both loading and

14 Verification and Performance Tests

unloading transients by triggering on the positive and negative slope.

Figure 2-2. Transient Response Waveform

Constant Current (CC) Tests

CC Setup

Follow the general setup instructions in the Measurement Techniques paragraph and the specific instructions given in the following paragrap hs.

Current Programming/Readback Accuracy

This test verifies that the current programming and readback are within specification. The accuracy of the current monitoring resistor is determined by the power coefficient (see Table 1-1).

1. Turn off the module and connect the current monitoring resistor directly across the output and a DVM across the

resistor. Refer to the "Current Monitoring Resistor" paragraph.

2. Turn on the module and program the output voltage to 5V and the current to zero.

3. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert to amps and

record this value as (Io). The actual current (Io) and the reading on the keyboard display should be within the limits specified in the Performance Test Record Tables under CC PROGRAMMING @ 0 AMPS, for the particular model being tested.

4. Program the output voltage to 5V and the current to full-scale (see Table 2-1).

5. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert to amps and

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 module’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.

Verification and Performance Tests 15

The following steps show how to set up an Agilent 3458A System Voltmeter from its front panel to take a statistical average of 100 readings.

represents the unlabeled shift key in the FUNCTION/RANGE group.

1. Program 10 power line cycles per samp le by pressing

2. Program 100 samples per trigger by pressing

3. Set up the voltmeter to take measurements in the statistical mode as follows:

4. a. Press

b. Press c. Press

5. Now set up the voltmeter to read the average value of the measurements as follows:

6. a. Press

b. Press c. Press

7. Execute the average reading program by pressing

8. Wait for 100 readings and then read the average measurement by pressing

To repeat the measurement, perform steps (7) and (8).

CC Load Effect

This test measures the change in output current for a change in the load from full-scale output voltage to short circuit.

1. Turn off the module and connect the output to be tested as shown in Figure 2-1 with the voltmeter connected across the

2. Turn on the module and program the current to the full-scale current value and the output voltage to the maximum

3. Adjust the load in the CV mode for full-scale voltage as indicated on the keyboard display. Check that the CC

4. Record the output current reading (DVM reading ÷ current monitor resistance value in ohms).

until the MATH function is selected; then press . until the STAT function is selected; then press .

until the RMATH function is selected; then press . until the MEAN function is selected; then press .

current monitoring resistor.

programmable voltage value (see Table 2-1).

annunciator is on. If it is not, adjust the load to drop the output voltage slightly until the annunciator c omes on.

. Record this as your result.

Note You may want to use the average reading program described previously.

5. Short the load switch and record the output current reading.

6. The difference in the current readings in steps (4) and (5) is the load effect and should not exceed the limit specified in

the Performance Test Record Tables under CC LOAD EFFECT, for the particular model being tested.

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.

1. Turn off the module and c onnect the ac power line through a variable-voltage tr ansformer.

2. Connect the output terminals as shown in Figure 2-1 with the voltmeter connected across the current monitoring

resistor. Set the transformer to the nominal line voltage.

3. Turn on the module and program the current to the full-scale value and the output voltage to the maximum

programmable value (see Table 2-1).

4. 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. If it is not, adjust the load to drop the output voltage slightly until the annunciator c omes on.

5. Adjust the transformer to the LOW line voltage (e.g., 87Vac for a 115Vac nominal input, or 174Vac for a 230Vac

nominal input).

6. Record the output current reading (DVM reading ÷ current monitoring resistor in ohms).

16 Verification and Performance Tests

Note You may want to use the average reading program described previously.

7. Adjust the transformer to the HIGH line voltage (e.g., 132Vac for a 115Vac nominal input, or 250Vac for a 230Vac

nominal input), and record the output current reading.

8. The difference in the current readings in steps (6) and (7) is the CC source effect and should not exceed the values

listed in the Performance Test Record Tables under CC SOURCE EFFECT, for the particular model being tested.

CC Noise (PARD)

Periodic and random deviations (PARD) in the output (ripple and noise) 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 20Hz to 20MHz with the module in CC operation.

1. Turn off the module and connect the load resistor (R

) and rms voltmeter as shown in Figure 2-1. Use only a resistive

load for this test. Keep leads as short as possible to reduce noise pickup.

2. Check the test setup for noise with the module turned off. Other equipment (e.g. computers, DMM, etc.) may affect the

reading.

3. Turn on the module and program the current to full-scale and the output voltage to the maximum programmable value

(see Table 2-1).

4. The output current should be at the full-scale rating with the CC Mode on.

5. Divide the reading on the rms voltmeter by the shunt resistance to obtain rms current. It should not exceed the values

listed in the Performance Test Record Tables under CC NOISE (Rms) for the particular unit being tested.

Verification and Performance Tests 17

Table 2-2. Performance Test Record for Model Agilent 66101A (8V, 16A)

Pre Cal_____________Post Cal______________

Model Agilent 66101A Temperature___________________________Test Performed By_______________________

Serial Number_______________________Humidity________________________Date__________________________

Test Description Specification Measurement

Uncertainty

CV PROGRAMMING @ 0 volts Output Accuracy (DVM Reading) Display and Readback Accuracy

CV PROGRAMMING @ full-scale Output Accuracy (DVM Reading) Display and Readback Accuracy

CV LOAD EFFECT 1mV

CV SOURCE EFFECT 0.5mV

CV NOISE (PARD) Peak to Peak Rms

TRANSIENT RECOVERY in 1 ms 100mV 15mV ________

CC PROGRAMMING @ 0 amps Output Accuracy (Io) Display and Readback Accuracy

0 ± 3mV

DVM ± 2mV

8V ± 5.4mV

DVM ± 3.6mV

5mV 2mV

0 ± 6mA

Io ± 6mA

1.5µV

88µV 88µV

1µV

0.87mV 150µV

150µA 150µA

Actual

________ ________

________

________ ________

CC PROGRAMMING @ full-scale Output Accuracy (Io) Display and Readback Accuracy

CC LOAD EFFECT 0.5mA

CC SOURCE EFFECT 0.75mA

CC NOISE (RMS) 8mA 0.9mA ________

18 Verification and Performance Tests

16A ± 10.8mA

Io ± 9.2mA

2.1mA

15µA 15µA

________ ________

________

Table 2-3. Performance Test Record for Model Agilent 66102A (20V, 7.5A)

Pre Cal_____________Post Cal______________

Model Agilent 66102A Temperature___________________________Test Performed By______________________

Serial Number_______________________Humidity________________________Date__________________________

Test Description Specification Measurement

Uncertainty

CV PROGRAMMING @ 0 volts Output Accuracy (DVM Reading) Display and Readback Accuracy

CV PROGRAMMING @ full-scale Output Accuracy (DVM Reading) Display and Readback Accuracy

CV LOAD EFFECT 1mV

CV SOURCE EFFECT 0.5mV

CV NOISE (PARD) Peak to Peak Rms

TRANSIENT RECOVERY in 1 ms 100mV 15mV ________

CC PROGRAMMING @ 0 amps Output Accuracy (Io) Display and Readback Accuracy

0 ± 8mV

DVM ± 3mV

20V ± 14mV

DVM ± 7mV

7mV 3mV

0 ± 3mA

Io ± 3mA

1.6µV

335µV 335µV

20µV

0.872mV 500µV

150µA 150µA

Actual

________ ________

________

________ ________

CC PROGRAMMING @ full-scale Output Accuracy (Io) Display and Readback Accuracy

CC LOAD EFFECT 0.2mA

CC SOURCE EFFECT 0.5mA

CC NOISE (RMS) 4mA 0.7mA ________

7.5A ± 5.3mA Io ± 4.5mA

Verification and Performance Tests 19

1mA 1mA

9µA 9µA

________ ________

________

Table 2-4. Performance Test Record for Model Agilent 66103A (35V, 4.5A)

Pre Cal_____________Post Cal______________

Model Agilent 66103A Temperature___________________________Test Performed By______________________

Serial Number_______________________Humidity________________________Date__________________________

Test Description Specification Measurement

Uncertainty

CV PROGRAMMING @ 0 volts Output Accuracy (DVM Reading) Display and Readback Accuracy

CV PROGRAMMING @ full-scale Output Accuracy (DVM Reading) Display and Readback Accuracy

CV LOAD EFFECT 1mV

CV SOURCE EFFECT 1mV

CV NOISE (PARD) Peak to Peak Rms

TRANSIENT RECOVERY in 1 ms 100mV 15mV ________

CC PROGRAMMING @ 0 amps Output Accuracy (Io) Display and Readback Accuracy

0 ± 13mV

DVM ± 8mV

35V ± 23.5mV

DVM ± 15mV

10mV

5mV

0 ± 2mA

Io ± 2mA

1.7µV

526µV 526µV

28µV

0.90mV 500µV

15µA 15µA

Actual

________ ________

________

________ ________

CC PROGRAMMING @ full-scale Output Accuracy (Io) Display and Readback Accuracy

CC LOAD EFFECT 0.2mA

CC SOURCE EFFECT 0.3mA

CC NOISE (RMS) 2mA

20 Verification and Performance Tests

4.5A ± 3.4mA Io ± 2.9mA

0.7mA

3µA 3µA

250µA

________ ________

________

Table 2-5. Performance Test Record for Model Agilent 66104A (60V, 2.5A)

Pre Cal_____________Post Cal______________

Model Agilent 66104A Temperature___________________________Test Performed By______________________

Serial Number_______________________Humidity________________________Date__________________________

Test Description Specification Measurement

Uncertainty

CV PROGRAMMING @ 0 volts Output Accuracy (DVM Reading) Display and Readback Accuracy

CV PROGRAMMING @ full-scale Output Accuracy (DVM Reading) Display and Readback Accuracy

CV LOAD EFFECT 2mV

CV SOURCE EFFECT 2mV

CV NOISE (PARD) Peak to Peak Rms

TRANSIENT RECOVERY in 1 ms 100mV 15mV ________

CC PROGRAMMING @ 0 amps Output Accuracy (Io) Display and Readback Accuracy

0 ± 27mV

DVM ± 16mV

60V ± 45mV

DVM ± 28mV

15mV

9mV

0 ± 0.6mA

Io ± 0.6mA

1.8µV

845µV 845µV

40µV

1.0mV

1.5mV

15µA 15µA

Actual

________ ________

________

________ ________

CC PROGRAMMING @ full-scale Output Accuracy (Io) Display and Readback Accuracy

CC LOAD EFFECT 0.1mA

CC SOURCE EFFECT 0.1mA

CC NOISE (RMS) 1mA 0.2mA ________

1 18mV Rms when the ac input is between 87 and 104Vac.

2.5A ± 1.4mA Io ± 1.1mA

Verification and Performance Tests 21

323µA 323µA

2µA 2µA

________ ________

________

Table 2-6. Performance Test Record for Model Agilent 66105A (120V, 1.25 A)

Pre Cal_____________Post Cal______________

Model Agilent 66105A Temperature___________________________Test Performed By______________________

Serial Number_______________________Humidity________________________Date__________________________

Test Description Specification Measurement

Uncertainty

CV PROGRAMMING @ 0 volts Output Accuracy (DVM Reading) Display and Readback Accuracy

CV PROGRAMMING @ full-scale Output Accuracy (DVM Reading) Display and Readback Accuracy

CV LOAD EFFECT 4mV

CV SOURCE EFFECT 3mV

CV NOISE (PARD) Peak to Peak Rms

TRANSIENT RECOVERY in 1 ms 100mV 15mV ________

CC PROGRAMMING @ 0 amps Output Accuracy (Io) Display and Readback Accuracy

0 ± 54mV

DVM ± 32mV

120V ± 90mV DVM ± 56mV

25mV 18mV

0 ± 0.6mA

Io ± 0.6mA

2.1µV

1.7mV

230µV

1.0mV

1.5mV

15µA 15µA

Actual

________ ________

________

________ ________

CC PROGRAMMING @ full-scale Output Accuracy (Io) Display and Readback Accuracy

CC LOAD EFFECT

CC SOURCE EFFECT

CC NOISE (RMS) 1mA 0.2mA ________

22 Verification and Performance Tests

1.25A ± 975µA Io ± 850µA

50µA1.4 50µA1.4µA

157µA 157µA

________ ________

________

Table 2-7. Performance Test Record for Model Agilent 66106A (200V, 0.75A)

Pre Cal_____________Post Cal______________

Model Agilent 66106A Temperature___________________________Test Performed By______________________

Serial Number_______________________Humidity________________________Date__________________________

Test Description Specification Measurement

Uncertainty

CV PROGRAMMING @ 0 volts Output Accuracy (DVM Reading) Display and Readback Accuracy

CV PROGRAMMING @ full-scale Output Accuracy (DVM Reading) Display and Readback Accuracy

CV LOAD EFFECT 7mV

CV SOURCE EFFECT 5mV

CV NOISE (PARD) Peak to Peak Rms

TRANSIENT RECOVERY in 1 ms 100mV 15mV ________

CC PROGRAMMING @ 0 amps Output Accuracy (Io) Display and Readback Accuracy

0 ± 90mV

DVM ± 54mV

200V ± 150mV

DVM ± 94mV

50mV 30mV

0 ± 0.4mA

Io ± 0.3mA

2.6µV

2.7mV

350µV

1.5mV

5.0mV

15µA 15µA

Actual

________ ________

________

________ ________

CC PROGRAMMING @ full-scale Output Accuracy (Io) Display and Readback Accuracy

CC LOAD EFFECT

CC SOURCE EFFECT

CC NOISE (RMS) 1mA 0.2mA ________

0.75A ± 625µA Io ± 450µA

10µA1 30µA1µA

Verification and Performance Tests 23

100µA 100µA

________ ________

________

Troubleshooting

This chapter provides troubleshooting and repair information for the Agilent 6610xA Power Modules. Before attempting to troubleshoot the modules, ensure that the problem is not with an external circuit or application, the mainframe, the GPIB controller, the application program, or the input power line.

SHOCK HAZARD Most of the troubleshooting procedures given in this chapter are performed with power applied and protective covers removed. Such maintenance should be performed only by trained

service personnel who are aware of the hazards (for example, tire and electrical shock).

Hazardous voltages are present throughout the P ower and Bias board assemblies. Ac line voltage is present on some connectors even when the module is not turned on. The dc rail voltage to the module is 310 volts when the unit is turned on.

Troubleshooting Sequence

1. Verify that the module is at fault.

2. Use the flowcharts to locate the functional block at fault.

3. Troubleshoot the functional block per flowchart instructions.

Selftest routines built into firmware are provided to help isolate a problem to a particular circuit on the board. Once a problem has been isolate d to a circuit, suggestions are given in the appropriate flowchart as to what component may be at fault.

This instrument uses components that can be damaged or suffer serious performance degradation as a result of ESD (electrostatic discharge). Observe the standard anti-static precautions discussed in

Chapter 1 to avoid damage to components.

Accessing the Flowcharts

The following troubleshooting flowcharts are provided to help you identify and isolate a problem to a specific circuit. Once a problem has been narrowed down, suggestions are provided as to the components that may be responsible fo r the problem. Refer to the schematic diagrams for detailed information on circuit wiring and component function.

þ Figure 3-1 - Overall Troubleshooting þ Figure 3-2 - Troubleshooting Microprocessor Circuits þ Figure 3-3 - Troubleshooting Error Messages þ Figure 3-4 - Troubleshooting Overvoltage at Turn-on

Troubleshooting 25

þ Figure 3-5 - Troubleshooting No Output þ Figure 3-6 - Troubleshooting High Output þ Figure 3-7 - Troubleshooting W ill Not Overvoltage þ Figure 3-8 - Troubleshooting CV Accuracy þ Figure 3-9 - Troubleshooting CC Accuracy þ Figure 3-10 - Troubleshooting Downprogrammer þ Figure 3-11 - Troubleshooting DAC Circuit þ Figure 3-12 - Troubleshooting Readback Circuits

Oscilloscope waveforms are provided on some flowcharts along with the settings required to generate the waveforms.

Connect the module to ac mains through an isolation transformer when making measurements with an oscilloscope or any equipment that has the measuring input grounded.

If You Experienced a Selftest Failure or RunTime Error Message

If you experienced a selftest failure or runtime error message as described in Chapter 3 of the Power Module User’s Guide, disassemble the module and proceed directly to the flowchart in Figure 3-3 "Troubleshooting Error Messages".

If You Experienced Other Problems With the Module

If you experienced problems other than a selftest failure or a runtime error message, disassemble the module and proceed directly to Figure 3-1 "Overall Troubleshooting".

26 Troubleshooting

Figure 3-1. Overall Troubleshooting (Sheet 1 of 3)

Troubleshooting 27

28 Troubleshooting

Figure 3-1. Overall Troubleshooting (Sheet 2 of 3)

Figure 3-1. Overall Troubleshooting (Sheet 3 of 3)

Troubleshooting 29

Figure 3-2. Troubleshooting Microprocessor Circuits (Sheet 1 of 2)

30 Troubleshooting

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