Agilent Technologies 6814B, 6834B, 6843A User Manual

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SERVICE MANUAL

AC Power Source/Analyzer

Agilent Models 6814B and 6834B

Regulatory Test Solution (RTS) - formerly called

the Harmonic/Flicker Test System (HFTS)

Agilent Model 6843A

For instruments with Serial Numbers:

Model 6814B: 3601A-00101 through 00272

US36010273 and up

Model 6834B: 3601A-00101 through 00403

US36010404 and up

Model 6843A: 3531A-00101 through 00256

US35310257 and up

Agilent Part No. 5962-0891 Printed in USA Microfiche Part No. 5962-0892 October, 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 Technologies 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 operation of the software, firmware, or hardware shall be uninterrupted 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 by (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's 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. Warranty 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's full line of Support Programs.

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".

WARNING.

• Servicing instructions are for use by service-trained personnel. To avoid dangerous electrical shock, do not perform any

servicing unless you are qualified to do so.

• BEFORE SWITCHING ON THE INSTRUMENT, the protective earth terminal of the instrument must be connected to

the protective conductor of the (mains) power cord. The mains plug shall be inserted only in an outlet socket that is provided with a protective earth contact. This protective action must not be negated by the use of an extension cord (power cable) that is without a protective conductor (grounding). Grounding one conductor of a two-conductor outlet is not sufficient protection.

• If this instrument is to be energized via an auto-transformer (for voltage change), make sure the common terminal is

connected to the earth terminal of the power source.

• Any interruption of the protective (grounding) conductor (inside or outside the instrument), or disconnecting of the

protective earth terminal will cause a potential shock hazard that could result in personal injury.

• Whenever it is likely that the protective earth connection has been impaired, this instrument must be made inoperative

and be secured against any unintended operation.

• Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used.

Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.

• Do not operate this instrument in the presence of flammable gases or fumes.

• Do not install substitute parts or perform any unauthorized modification to this instrument.

• Some procedures described in this manual are performed with power supplied to the instrument while its protective

covers are removed. If contacted, the energy available at many points may result in personal injury.

• Any adjustment, maintenance, and repair of this instrument while it is opened and under voltage should be avoided as

much as possible. When this is unavoidable, such adjustment, maintenance, and repair should be carried out only by a skilled person who is aware of the hazard involved.

• Capacitors inside this instrument may hold a hazardous electrical charge even if the instrument has been disconnected

from its power source.

SAFETY SYMBOLS.

Instruction manual symbol. The instrument will be marked with this symbol when it is necessary for you to refer to the instruction manual in order to protect against damage to the instrument.

This sign indicates hazardous voltages.

This sign indicates an earth terminal (sometimes used in the manual to indicate circuit common connected to a ground chassis).

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.

Printing History

The current edition of this manual is indicated below. Reprints of this manual containing minor corrections and updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition incorporates all new or corrected material since the previous printing date.

Changes to the manual occurring between revisions are covered by change sheets shipped with the manual. In some cases, the manual change applies only to specific instruments. Instructions provided on the change sheet will indicate if a particular change applies only to certain instruments.

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 the prior consent of Agilent Technologies. The information contained in this document is subject to change without notice.

Instrument Identification

The power supply is identified by a unique, two-part serial number, such as, 3601A-00101. The items in this serial number

are explained as follows:

Item Description US The letter suffix indicates the country of manufacture, where US = USA.

3601 This is a code that identifies either the date of manufacture, or the date of a significant design change.

0101 The last five digits of the serial number (0101) is a unique number assigned to each AC Power Source.

Update 2_______________________ October 2000

1. Introduction

Scope ............................................................................................................................................................7

Organization ..............................................................................................................................................7

Safety Considerations...................................................................................................................................7

Related Documents....................................................................................................................................7

Revisions ......................................................................................................................................................7

Manual Revisions......................................................................................................................................7

Firmware Revisions ...................................................................................................................................8

Electrostatic Discharge.................................................................................................................................8

2. Performance Tests

Introduction ..................................................................................................................................................9

Test Equipment Required.............................................................................................................................9

General Measurement Techniques................................................................................................................9

Current-Monitoring Resistor ......................................................................................................................10

Performance Tests ......................................................................................................................................10

Performance Test Record Sheets................................................................................................................10

3. Troubleshooting

Introduction ................................................................................................................................................19

Localizing the Problem...............................................................................................................................19

Test Equipment Required...........................................................................................................................19

List of Equipment .......................................................................................................................................19

Troubleshooting Procedure ........................................................................................................................19

Using the *TST? Query..............................................................................................................................19

Firmware Revisions ....................................................................................................................................20

ROM Replacement or ROM Update ..........................................................................................................20

Calibration Configuration Switch ...............................................................................................................21

Troubleshooting Hints................................................................................................................................22

Switching Amplifier Output Balancing......................................................................................................22

4. Principles of Operation

Introduction ................................................................................................................................................31

General Description....................................................................................................................................31

A1, A2, A3 Switching Amplifier Modules .................................................................................................31

A4 Mother Board Assembly .......................................................................................................................31

A5 Relay Range / Sense Assembly.............................................................................................................32

A6 Servo (Control) Assembly ....................................................................................................................32

A7 IEEE-488 (GPIB) / RS-232 Interface Assembly ..................................................................................32

A8 Digital Signal Processing Assembly .....................................................................................................32

A9 Input Power Assembly (208 Volt Input)...............................................................................................32

A9 Input Power Assembly (400 Volt Input)...............................................................................................32

A10 Auxiliary Power Supply......................................................................................................................33

A11 Front Panel Display Assembly............................................................................................................33

A12 Input Filter Assembly .........................................................................................................................33

A13 Bridge Capacitor Filter Assembly.......................................................................................................33

A14 Bias Power Supply..............................................................................................................................33

5. Replaceable Parts

Introduction ................................................................................................................................................35

Table of Contents (continued)

6. Diagrams

Introduction ................................................................................................................................................37

General Schematic Notes............................................................................................................................37

Index...............................................................................................................................................53

Figures

2-1. Verification Test Setup.................................................................................................................................... 17

2-2. Verification Test Setup.....................................................................................................................................18

3-1. Bias Voltage to Switching Amplifier Assemblies.............................................................................................28

3-2. AC Programming Signal Path ..........................................................................................................................29

4-1. Agilent Series 665xA/667xA Power Supply, Block Diagram ..........................................................................34

6-1. Mechanical Layouts..........................................................................................................................................38

6-2. Agilent 6814B, 6834B, 6843A Front Frame Assembly....................................................................................39

6-3. A9 208/230V AC Input Board Parts Location .................................................................................................40

6-4. A9 208/230V AC Input Assembly Schematic ..................................................................................................41

6-5. A9 400V AC Input Board Parts Location.........................................................................................................42

6-6. A9 400V AC Input Assembly Schematic .........................................................................................................43

6-7. A10 Auxiliary Power Supply Board Parts Location.........................................................................................44

6-8. A10 Auxiliary Power Supply Assembly Schematic..........................................................................................45

6-9. A14 Bias Power Supply Board Parts Location.................................................................................................46

6-10. A14 Bias Power Supply Assembly Schematic.................................................................................................47

6-11. A5 Range/Output/Phase Relay Schematic.......................................................................................................48

6-12. A5 Range/Output/Phase Relay Driver Schematic............................................................................................49

6-13. A4 Mother Board Parts Location.....................................................................................................................50

6-14. A8 DSP Board Parts Location.........................................................................................................................51

6-15. A6 Servo Board Test Point Locations.............................................................................................................52

Tables

2-1. Test Equipment Required .....................................................................................................................................9

2-2. Performance Tests ..............................................................................................................................................10

2-3. Performance Test Record Form...........................................................................................................................13

2-4. Performance Test Record Agilent 6814B............................................................................................................14

2-4. Performance Test Record Agilent 6834B............................................................................................................15

2-4. Performance Test Record Agilent 6843A............................................................................................................16

3-1. Test Equipment Requirements for Troubleshooting............................................................................................19

3-2. Specific Troubleshooting Procedures..................................................................................................................21

3-3. AC Power Source Troubleshooting Procedure ....................................................................................................23

3-4. A9 208/208 Input Power Supply Troubleshooting..............................................................................................25

3-5. A9 Option 400 (400V) AC Input Power Supply Troubleshooting ......................................................................25

3-6. A10 Auxiliary Power Supply Troubleshooting....................................................................................................26

3-7. Al4 Option 400 Bias Power Supply Troubleshooting .........................................................................................26

3-8. A4 Mother Board Troubleshooting .....................................................................................................................27

3-9. A5 Mother Board Troubleshooting .....................................................................................................................27

5-1. Agilent 68l4B, 6834B, 6843A Replacement .......................................................................................................35

6-1. General Schematic Notes.....................................................................................................................................37

Introduction

Scope

Organization

This manual contains information for troubleshooting and repairing to the component level Agilent Model 6814B, 6834B

AC Power Source/Analyzers and Agilent Model 6843A Regulatory Test Solution, hereafter referred to as an AC Power Source. The manual applies to both standard units and units that have Option 400. This manual is organized as follows:

Chapter Description Chapter 2 Performance tests Chapter 3 Troubleshooting procedures Chapter 4 Principles of operation on a block-diagram level Chapter 5 Replaceable parts Chapter 6 Diagrams

Safety Considerations

This AC Power Source is a Safety Class I instrument, which means it has a protective earth terminal. This terminal must be connected to earth ground through a power source equipped with a 4-wire, ground receptacle. Refer to the “Safety Summary” page at the beginning of this manual for general safety information. Before operation or repair, check the AC Power Source and review this manual for safety warnings and instructions. Safety warnings for specific procedures are located at appropriate places in the manual.

Hazardous voltages exist within the AC Power Source chassis, at the output terminals, and at the analog

Revisions

Manual Revisions

This manual was written for AC Power Sources; that have the same serial prefixes (first part) as those listed on the title page and whose serial numbers (second part) are equal to or higher than those listed in the title page.

Introduction

Note 1) If the serial prefix of your unit is higher than that shown in the title page then the unit was made after

the publication of this manual and may have hardware and/or firmware differences not covered in this manual. If they are significant to the operation and/or servicing of the AC Power Source, those differences are documented in one or more Manual Change sheets included with this manual.

2) If the serial prefix on the unit; is lower than that shown on the title page, then the unit was made before the publication of this manual and can be different from that described here. Such differences are covered in “Appendix A - Manual Backdating Changes” in the User’s Manual.

Firmware Revisions

You can obtain the firmware revision number by either reading the integrated circuit label, or query the AC Power Source; using the GPIB *IDN query command (see "Chapter 3 -Troubleshooting" ).

Electrostatic Discharge

The power supply has components that can be damaged by ESD (electrostatic discharge). Failure to observe standard, antistatic practices can result in serious degradation of performance, even when an actual failure does not occur.

When working on the AC Power Source; observe all standard, antistatic work practices. These include, but are 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, or equivalent).

• using a conductive wrist strap, such as 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 AC Power Source before removing or installing printed circuit boards .

Introduction

Performance Tests

Introduction

This chapter provides test procedures for checking the operation of an Agilent Model 6814B/6834B AC Power Source/Analyzer or Agilent Model 6843A RTS. The required test equipment is specified and sample performance test record sheets are included. Instructions are given for performing the tests using the front panel keypad.

Test Equipment Required

Table 2-1 lists the equipment required to perform the verification tests given in this chapter.

Table 2-1. Test Equipment Required

Equipment Characteristics Recommended Model

Digital Voltmeter* Resolution: 10nV @ 1V

Readout: 81/2 digits Accuracy: <20ppm

Current Monitor 0.01 ohms +/-200ppm 10W Guildline 7320/0.01

Agilent 3458A

Audio Analyzer Input Voltage Range: 50mV to 300 V

Distortion Accuracy: +/-1 db 20Hz to 20KHz Residual Distortion / Noise: -80db (0.0 1 %) 20Hz to 20KHz

Frequency Counter Accuracy @ 1 KHz < 0.001% Agilent5316B

Ratio Transformer* 30:1 ratio < 50ppm

Variable –Voltage Transformer

Load Resistors 6814B use 4 ea. 7.5 ohms > 1000W

GPIB Controller Full GPIB capabilities HP Series 200/300

* The 30:1 ratio transformer is not required for a valid MIL-STD 45662A test. The 30:1 ratio transformer is only required when a 4:1 test equipment to specification ratio is desired using a 3458A voltmeter in the 1000 volt range.

Power: 3 phase 24 KVA Range: 180-254V 47-63 Hz 360-440V 47-63 Hz

6834B use 4 ea. 15 ohm > 1000W 6843A use 4 ea. 5 ohm > 1500W

Agilent8903A

Superior Powerstat 1156DT-3Y 0-280 50A 24.2KVA or equivalent

General Measurement Techniques

The following chapters provide the test procedures for verifying the Agilent 6814B, 6834B or 6843A's compliance with the specifications listed in Appendix A of the Users Guide. Please refer to CALIBRATION PROCEDURE or TROUBLESHOOTING if you observe out-of specification performance. The performance test specifications are listed in the Performance Test Record Card at the end of this chapter. You can record the actual measured values in the columns

Performance Tests

provided. Select an adequate gauge wire for load tests using the procedures given in the operating manual for connecting the load.

Current-Monitoring Resistor

To eliminate output current measurement error caused by voltage drops in the leads and connections, connect the current-monitoring resistor as a four terminal device.

Performance Tests

Performance tests check all the specifications of the ac source. The various tests are grouped under Table 2-2. If more than one meter or a meter and an oscilloscope are used, connect each to the sense terminals by separate leads to avoid mutual coupling effects.

Performance Test Record Sheets

When performing the tests in this chapter, refer to the Performance Test Record sheets ( Table 2-3 and Table 2-4 ) at the end of this chapter. Table 2-3 is for recording common information, such as test equipment used and environmental conditions. Table 2-4 is for recording the actual measurements.

Table 2-2. Voltage / Frequency Programming and Readback Accuracy

Step Action Normal Result

This procedure verifies that the voltage programming and GPIB readback and front panel display functions are within specifications.

5 6

Turn off ac source. Connect DVM and Ratio Transformer if used across output terminals as shown in Test Setup Figure 2-1. Turn on ac source with no load. Press [Shift] [Output], display reads *RST, press [Enter]. Program VOLT:ALC EXT, VOLT 300, FREQ 45, CURR 10 Enable output press [Output on/off]. Record output voltage / frequency measurements from DVM / front panel and frequency meter. Program FREQ 400. Record output voltage / frequency measurements from DVM / front panel and frequency meter. Program FREQ 1000.

*RST resets ac source to known factory state. CV annunciator on. Output voltage at 300 volts. Output voltage / frequency measurements within specified limits on test card.

Output voltage / frequency measurements within specified limits on test card.

11 12

13 14

Performance Tests

Record output voltage / frequency measurements from DVM / front panel and frequency meter. Program VOLT:RANGE 150, VOLT 150, FREQ 45.

Record output voltage / frequency measurements from DVM / front panel and frequency meter. Program FREQ 400. Record output voltage / frequency measurements from DVM / front panel and frequency meter. Program FREQ 1000. Record output voltage / frequency measurements from DVM / front panel and frequency meter.

Output voltage / frequency measurements within specified limits on test card. CV annunciator on. Output voltage at 150 volts. Output voltage / frequency measurements within specified limits on test card.

Output voltage / frequency measurements within specified limits on test card.

Table 2-2. ( Continued ) CV Load Effect

Step Action Normal Result

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

4 5 6 7

Turn off ac source. Connect DVM across output terminals ( or ratio transformer if used ) and 7.5 ohm for Agilent 6814B, 15 ohm for 6834B or 5 ohms for 6843A load resistors as shown in Test Setup Figure 2-1. Turn on ac source. Press [Shift] [Output] display reads *RST press [Enter]. Program VOLT:ACL EXT, VOLT:RANGE 150 VOLT 150

CURR 20 for Agilent 6814B, CURR 10 for Agilent 6834B or CURR 32 for Agilent6843A. Enable output press [Output on/off].

Record output voltage measurement from DVM. Open S1 ( S2 or S3 if Agilent 6834B ). Output current near zero. Record output voltage measurement from DVM. Check test result.

*RST resets ac source to known factory default state. CV annunciator on or reduce voltage until CV annunciator come on. Output current near 20A for Agilent6814B, 10A for Agilent 6834B or 30A for Agilent6843A.

The difference between the DVM readings in step 4 & 6 are within the specified load effect limits.

Table 2-2. ( Continued ) CV Source Effect

Step Action Normal Result

This test measures the change in output voltage resulting from a change in ac mains input voltage from the minimum to maximum value within the line voltage specification.

Turn off ac source. Connect DVM across output terminals ( or ratio transformer if used ) and 30 ohm for Agilent 6814B, 60 ohm for 6834B or 20 ohm for Agilent6843A load resistors as shown in Test Setup Figure 2-1. Turn on ac source. Press [Shift] [Output] display reads *RST press [Enter]. Program VOLT:ALC EXT, VOLT 300, CURR 10 for Agilent 6814B, CURR 5 for Agilent 6834B or CURR 16 for Agilent6843A. Enable output press [Output on/off].

Adjust the variable transformer to low line condition. ( 180 or 360 Vac ). Record voltage reading of DMM. Adjust the variable transformer to high line condition. ( 254 or 440 Vac ). Record voltage reading of DMM. Check test result.

*RST resets ac source to known factory default state. CV annunciator on or reduce voltage until CV annunciator comes on. Output current near 10A for Agilent6814B; 5A for Agilent 6834B or 15A for Agilent6843A.

The difference between the DVM readings in step 3 & 5 are within the specified load effect limits.

Performance Tests

Table 2-2. ( Continued ) rms Current Accuracy Test

Step Action Normal Result

This test verifies the measurement accuracy of the rms current readback.

Step Action Normal Result

Turn off ac source. Connect Current Shunt, 7.5 ohm for Agilent 6814B, 15 ohm for Agilent 6834B or 5 ohm for Agilent6843A load resistors and DVM as shown in Test Setup Figure 2- 2. Turn on ac source. Press [Shift] [Output] display reads *RST press [Enter]. Program VOLT 100, CURR 10 for Agilent 6814B, CURR 5 for Agilent6834B or CURR 15 for Agilent6843A. Enable output press [Output on/off].

Record DMM reading and calculate rms current. Record front panel reading.

Table 2-2. ( Continued ) Harmonic Distortion Test

This test measures the total harmonic distortion of the output sinewave at full power. Turn off ac source. Connect Audio Analyzer across output terminals (or ratio transformer if used) and 7.5 ohm for Agilent 6814B, 15 ohm for Agilent 6834B or 5 ohms for Agilent6843A load resistors as shown in Test Setup Figure 2-1 . Turn on ac source. Press [Shift] [Output] display reads *RST press [Enter]. Program output voltage to VOLT:RANGE 150, VOLT 150,

CURR 20 for Agilent6814B, CURR 10 for Agilent 6834B or CURR 32 for Agilent6843A.

Record the total harmonic distortion reading from the audio analyzer and front panel display.

*RST resets ac source to known factory default state. CC annunciator on or increase voltage till CC annuniciator comes on. Output current near 10A for Agilent6814B; 5A for Agilent 6834B or 15A for Agilent6843A. Difference between measured output current and front panel current reading is within specified limits.

*RST resets ac source to known factory default state. CV annunciator on or reduce voltage until CV annunciator comes on. Output current near 20A for Agilent6814B, 10A for Agilent6834B or 30A for Agilent6843A Readings are less than maximum specified limits.

Performance Tests

Table 2-3 Performance Test Record Form

Test Facility:

__________________________________________ Report No.__________________________________________ __________________________________________ Date______________________________________________ __________________________________________ Customer___________________________________________ __________________________________________ Tested By___________________________________________

Model_____________________________________ Ambient Temperature

_________________________________________________

Serial No.__________________________________ Relative Humidty ______________________________________ __________

Options__________________________________ Nominal Line Frequency (Hz) __________________________________ __________

Firmware Revision ___________________________

Special Notes:

____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________ ____________________________________________________________________________________________

Test Equipment Used

Description Model No. Trace No. Cal. Due Date

1. Digital Voltmeter ________ ___________ ___________

2. Frequency Meter ________ ___________ ___________

3. Audio Meter ________ ___________ ___________

4. Ratio Transformer ________ ___________ ___________

5. ________ ___________ ___________

Performance Tests

Table 2-4. Performance Test Record - Agilent 6814B AC Power Source

Model: Agilent 6814B Report No.: Date:

Test Description Min Spec Results Max Spec Meas

Voltage Programming & Readback Accuracy

High Range@ 45 Hertz

Program 300V

Front Panel Display

299.250

Vrms-400mV

High Range@ 400 Hertz

Program 300V

Front Panel Display

298.200

Vrms-400mV

High Range@ 1000 Hertz

Program 300V

Front Panel Display

296.700

Vrms-400mV

Low Range@ 45 Hertz

Program 150V

Front Panel Display

149.475

Vrms-325mV

Low Range@ 400 Hertz

Program 150V

Front Panel Display

148.950

Vrms-325mV

______V ______V

300.750

Vrms+400mV

301.800

Vrms+400mV

303.300

Vrms+400mV

150.525

Vrms+325mV

151.050

Vrms+325mV

Uncert **

140mV

( 1.2mV )

140mV

( 1.2mV )

140mV

( 1.2mV )

70mV

( 0.6mV )

70mV

( 0.6mV )

Low Range@ 1000 Hertz

Program 150V

Front Panel Display

148.200

Vrms-325mV

______V ______V

151.800

Vrms+325mV

70mV

( 0.6mV )

CV Load Effect Vo-0.75V ______V Vo+0.75V

CV Line Effect Vo-0.3V ______V Vo+0.3V

Rms Current Readback Io-0.060A ______A Io+0.060A l.lmA

Total Harmonic Distortion

Audio Analyzer

Front Panel Display

0% 0%

______% ______%

1% 1%

Frequency Programming & Readback Accuracy

Program 45Hz 44.985 ______Hz 45.014 0.9mHz

Front Panel Display Fo-0.014Hz ______Hz Fo+0.014Hz

Program 1 KHz 999.89 ______Hz 1000.110 0.010Hz

Front Panel Display Fo-0.110Hz ______Hz Fo+0.110Hz

**Note: 1. Measurement uncertainties are only valid when using test equipment listed in Table 2-1.

2. Voltage Programming and Readback measurements uncertainties are for a 3458A DMM in the 1000 volt range.

3. Measurement uncertainties in parenthesis are only if a 30:1 ratio transformer is used with the 3458A DMM.

Performance Tests

Table 2-4. (Continued) Performance Test Record – Agilent 6834B AC Power Source

Model: Agilent 6843B Report No.: Date:

Test Description Min Spec Results Max Spec Meas

Voltage Programming & Readback Accuracy

High Range@ 45 Hertz

Program 300V

Front Panel Display

299.250

Vrms-400mV

High Range@ 400 Hertz

Program 300V

Front Panel Display

298.200

Vrms-400mV

High Range@ 1000 Hertz

Program 300V

Front Panel Display

296.700

Vrms-400mV

Low Range@ 45 Hertz

Program 150V

Front Panel Display

149.475

Vrms-325mV

Low Range@ 400 Hertz

Program 150V

Front Panel Display

148.950

Vrms-325mV

______V ______V

300.750

Vrms+400mV

301.800

Vrms+400mV

303.300

Vrms+400mV

150.525

Vrms+325mV

151.050

Vrms+325mV

Uncert **

140mV

( 1.2mV )

140mV

( 1.2mV )

140mV

( 1.2mV )

70mv

( 0.6mV )

70mV

( 0.6mV )

Low Range@ 1000 Hertz

Program 150V

Front Panel Display

148.200

Vrms-325mV

______V ______V

151.800

Vrms+325mV

70mV

( 0.6mV )

CV Load Effect Vo-0.75V ______V Vo+0.75V

CV Line Effect Vo-0.3V ______V Vo+0.3V

rms Current Readback Io-0.030A ______A Io+0.030A l.lmA

Total Harmonic Distortion

Audio Analyzer

Front Panel Display

0% 0%

______% ______%

1% 1%

Frequency Programming & Readback Accuracy

Program 45Hz 44.985 ______Hz 45.014 0.9mHz

Front Panel Display Fo-0.014Hz ______Hz Fo+0.014Hz

Program 1 KHz 999.89 ______Hz 1000.110 0.010Hz

Front Panel Display Fo-0.110Hz ______Hz Fo+0.110Hz

**Note: 1. Measurement uncertainties are only valid when using test equipment listed in Table 2-1.

2. Voltage Programming and Readback measurements uncertainties are for a 3458A DMM in the 1000 volt range.

3. Measurement uncertainties in parenthesis are only if a 30:1 ratio transformer is used with the 3458A DMM

Performance Tests

Table 2-4. Performance Test Record - Agilent 6843A AC Power Source

Model: Agilent 6843A Report No.: Date:

Test Description Min Spec Results Max Spec Meas

Voltage Programming & Readback Accuracy

High Range@ 45 Hertz

Program 300V

Front Panel Display

299.250

Vrms-400mV

High Range@ 400 Hertz

Program 300V

Front Panel Display

298.200

Vrms-400mV

High Range@ 1000 Hertz

Program 300V

Front Panel Display

296.700

Vrms-400mV

Low Range@ 45 Hertz

Program 150V

Front Panel Display

149.475

Vrms-325mV

Low Range@ 400 Hertz

Program 150V

Front Panel Display

148.950

Vrms-325mV

______V ______V

300.750

Vrms+400mV

301.800

Vrms+400mV

303.300

Vrms+400mV

150.525

Vrms+325mV

151.050

Vrms+325mV

Uncert **

140mV

( 1.2mV )

140mV

( 1.2mV )

140mV

( 1.2mV )

70mV

( 0.6mV )

70mV

( 0.6mV )

Low Range@ 1000 Hertz

Program 150V

Front Panel Display

148.200

Vrms-325mV

______V ______V

151.800

Vrms+325mV

70mV

( 0.6mV )

CV Load Effect Vo-0.75V ______V Vo+0.75V

CV Line Effect Vo-0.3V ______V Vo+0.3V

Rms Current Readback Io-0.090A ______A Io+0.090A l.lmA

Total Harmonic Distortion

Audio Analyzer

Front Panel Display

0% 0%

______% ______%

1% 1%

Frequency Programming & Readback Accuracy

Program 45Hz 44.985 ______Hz 45.014 0.9mHz

Front Panel Display Fo-0.014Hz ______Hz Fo+0.014Hz

Program 1 KHz 999.89 ______Hz 1000.110 0.010Hz

Front Panel Display Fo-0.110Hz ______Hz Fo+0.110Hz

**Note: 1. Measurement uncertainties are only valid when using test equipment listed in Table 2-1.

2. Voltage Programming and Readback measurements uncertainties are for a 3458A DMM in the 1000 volt range.

3. Measurement uncertainties in parenthesis are only if a 30:1 ratio transformer is used with the 3458A DMM.

Performance Tests

HP3458A

DMM

130

NOTE: Be sure to move sense lead to phase

under test or connect sense leads

to all three phases.

Rl = 60 OHM @ 300V OUTPUT >1500W

15 OHM @ 150V OUTPUT >1500W

Rs = Current Monitor resistor - move for

testing current in phase 2 & 3

HP3458A

DMM

SENSE

O1O2O3

6834B

L1 L2

COM

AC INPUT 3 phase

180-254 VAC line to line

360-440 VAC lin e to li ne

TEST SETUP for 6834B

NOTE: Sense leads connections

reversed on 6843A

SENSE

COM

6814B or

6843A

Rl = 7.5 OHM or 30 OHM for 6814B

5 OHM or 20 OHM for 6843A

see performance test for correct value

Rs = Current Monitor resistor

TEST SETUP for 6814B / 6843A

*Note: Replace HP3458A DMM with HP5316B Counter for frequency test.

Replace HP3458A DMM with HP8903A Harmonic Analyzer for distortion test

Switch is for convience, not required.

Figure 2-1. Verification Test Setup

AC INPUT 3 phase

180-254 VAC line to line

360-440 VAC line to line

Performance Tests

HP3458A

DMM

Rl = 60 OHM @ 300V OUTPUT >1500W

15 OHM @ 150V OUTPUT >1500W

Rs = Current Monitor resistor - move for

testing current in phase 2 & 3

HP3458A

DMM

SENSE

O2O3

COM

6834B

TEST SETUP for 6834B

NOTE: Sense lead connections

reversed on 6843A

AC INPUT 3 phase

180-254 VAC line to line

360-440 VAC line to line

Performance Tests

Rl = 7.5 OHM or 30 OHM for 6814B

5 OHM or 20 OHM for 6843A

see perfor mance test for correct v alue

Rs = Current Monitor resistor

SENSE

COM

TEST SETUP for 6814B / 6843A

Figure 2-2 Verification Test Setup

6814B or

6843A

AC INP UT 3 phas e

180-254 VAC line to line

360-440 VAC line to line

Troubleshooting

Shock Hazard. The troubleshooting procedure in this chapter must be performed with power applied and protective covers removed. These procedures should be done only by trained service personnel aware of

the hazard from electrical shock.

This instrument uses components that can be damaged or suffer serious performance degradation due to ESD ( electrostatic discharge ). Observe standard antistatic precautions to avoid damage to components ( see Chapter 1 ).

Introduction

Localizing the Problem

This chapter provides troubleshooting and repair information for the Agilent 6814B, Agilent 6834B AC Power Source and Agilent 6843A RTS. Before beginning the troubleshooting procedures, make certain the problem is in the AC Power Source and not with an associated circuit, the GPIB controller, or the ac input lines. Without removing the covers, you can use the verification tests in chapter 2 to determine if the AC Power Source is operating normally.

Test Equipment Required

List of Equipment

Table 3-1 lists the equipment required to perform the troubleshooting procedures given in this chapter.

Table 3-1. Test Equipment Requirements for Troubleshooting

Equipment Characteristics Model

GPIB Controller Communicate with AC Source via GPIB or

RS232 Digital Voltmeter Check voltages / resistances Agilent 3458A or equivalent Oscilloscope Observe waveforms Agilent 54504A or equivalent Current Shunt Check output current 0.01 ohm 10 watt Logic Probe Check data lines Agilent 545A or equivalent

HP Series 200/300 Controller or Equivalent.

Troubleshooting Procedure

Table 3-2 gives the troubleshooting procedures to isolate a fault to a circuit board or particular circuit. See figure 6-l for the location of the circuit boards.

Using *TST? Query

The AC Power Source executes a partial selftest by sending the GPIB selftest query command *TST?. The command returns a value of zero if all tests pass. Otherwise, the command returns the error code of the first test that failed.

Troubleshooting

Firmware Revisions

The model number and then the firmware revision is displayed on the front panel for approximately l0 seconds when unit is first turned on. The firrnware revision is also accessible via the GPIB using the *IDN? query. The following sample AgilentBASIC program does this.

10 ALLOCATE L$[52] 20 OUTPUT 705;"*IDN?" 30 ENTER 705;L$ 40 DISP L$ 50 END

The computer will display the string "HEWLETT-PACKARD,<model >,0,<revision>".

ROM Replacement or ROM Update

Instruments that are being initialized for the first time or have suffered non-volatile memory corruption should be initialized with the front panel EEINIT command. To initialize the unit, perform the following:

1. Turn the unit on, then do the front panel CAL ON command.

2. Press 0 and 9 keys simultaneously. EEINIT <model> should now be displayed.

3. Scroll to the correct model number and press ENTER.

If the command is successful, the front panel display will go through a normal power-on sequence.

It is possible to update to newer ROM versions without destroying the calibration data. To update the unit to newer ROM revisions, perform the following.

1. Turn input power off, remove the old ROMs and install the new ROMS.

2. Turn the unit on, then do the front panel CAL ON command.

3. Press 0 and 9 keys simultaneously, then scroll to the ROMUPD command.

4. Scroll to the correct model number and press ENTER.

If the command is successful, the front panel display will go through a normal power-on sequence. If "OUT OF RANGE" error is displayed, then the instrument will have to be re-initialized with the EEINIT command and re-calibrated. This can occur if the instrument was previously initialized with a QA firmware revision ( QA.xx.xx ), or if non-volatile memory has become corrupted for any reason.

Troubleshooting

Calibration Configuration Switch

An internal set of switches control access to calibration commands. The switches are located on the A8 DSP board and are accessible by removing the top cover. Switches 1 and 2 set the calibration configuration. The three positions are:

Normal Cal This is the default switch position. The calibration functions are accessible after entering a

numeric password. The default password is 0 and is changeable by the user.

Clear Password The calibration password is reset to 0 and the remote programming language is set to SCPI.

This option is useful if the user has forgotten the password.

Inhibit Cal In this position the calibration of the power source cannot be changed. All calibration

commands are disabled. If the CAL ON command is sent with the switch in this position, an Out Of Range error will be displayed on the front panel. This option is useful in installations where calibration access is guarded by instrument seals.

Table 3-2. Specific Troubleshooting Procedures

Step Symptom Corrective Action

rl- Re-initialize unit and re-calibrate. If unit still has RAM error, replace A8 DSP board. To re-initialize unit turn CAL ON,

then press 0 and 9, simultaneously. Press scroll key to model number, then press Enter. When unit is re-initialized all CAL data, user-defined WAVEFORM data, and LIST data is erased.

r2 -Replace A8 DSP board.

No output voltage / front panel display and fan off go to table 3-3 No or limited output / front panel display and fan on go to figure 3-2 Turn-on Self Test Errors Error l Non-volatile RAM RD0 section checksum failed Rl Error 2 Non-volatile RAM CONFIG section checksum failed Rl Error 3 Non-volatile RAM CAL section checksum failed Rl Error 4 Non-volatile RAM WAVEFORM section checksum failed Rl Error 5 Non-volatile RAM STATE section checksum failed Rl Error 6 Non-volatile RAM LIST STATE section checksum failed Rl Error l0 RAM selftest r2 Error 11 to 18 DAC self tests, l through 8 r2

Troubleshooting

Troubleshooting Hints

1. Read all troubleshooting instructions before attempting to troubleshoot the unit.

2. If the AC Power Source operates properly but does not deliver full output power capability, check the ac input mains

fuses located on the rear panel.

3. The amplifiers, ( Al, A2, A3 ) may be interchanged in identical models for troubleshooting purposes. The Agilent

6814A, 6834A, and 6843A models Al, A2, A3 amplifiers cannot be used in the Agilent 6814B or 6834B models. See Chapter 5, Replaceable Parts, for correct replacement amplifier.

4. The Agilent 6814B uses amplifiers Al and A2 and the 6843A uses amplifiers A1, A2 and A3 connected in parallel at

the output. Drawings show the connections and schematics for the Agilent 6834B 3 phase unit. When troubleshooting the Agilent 6814B, the A3 amplifier and its associated parts are deleted from specific circuit boards.

5. Troubleshooting the A9 option 400 ( 380 to 460 volt ) Input PS is not recommended at this time. This is a 500 Vdc to

300 Vdc step down switching regulator and contains hazardous voltages.

Switching Amplifier Output Balance Adjustments

If the switching amplifiers ( A1, A2 or A3 ) are replaced phase B and C amplifier gains may require adjustment so they better match that of phase A and current share equally when paralleled as a single phase output.

6834B Amplifier Balancing

1. With ACS off, temporarily short A5TP1 to A5TP2 on the A5 Relay board (this deactivates the paralleling relays).

2. Turn on ACS, program the output for single-phase operation, 300V, 60Hz, no load.

3. Measure the voltage from phase A output to common and from phase B output to common.

4. Adjust the phase B gain pot, A2A2R104, until phase B output matches phase A output to within 50 millivolts.

5. Measure the phase C output to common.

6. Adjust the phase C gain pot , A3A2R104, until phase C output matches phase A output to within 50 millivolts.

7. Turn off ACS and remove the short from TP1 to TP2.

6814B Amplifier Balancing

1. Turn off ACS, remove phase B amplifier. Turn on ACS. Program output voltage to 300V, 60Hz, no load.

2. Measure and note drive voltage on A6 Servo board at A6TP5 with respect to A6TP1.

3. Turn off ACS, remove phase A amplifier, install phase B amplifier in phase B slot. Turn on ACS. Program output

voltage to 300V, 60Hz, no load.

4. Measure drive voltage at A6TP3 as before. Adjust phase B gain pot A2A2R104 for same drive voltage as noted in step

2, plus or minus 2 millivolts.

5. Turn off ACS, re-install phase A amplifier in phase A slot.

6843A Amplifier Balancing

1. Turn off ACS, remove phase B and C amplifiers. Turn on ACS. Program output voltage to 300V, 60Hz, no load.

2. Measure and note drive voltage on A6 Servo board at A6TP3 with respect to A6TP1.

3. Turn off ACS, remove phase A amplifier, install phase B amplifier in phase B slot. Turn on ACS. Program output

voltage to 300V, 60Hz, no load.

4. Measure drive voltage at A6TP3 as before. Adjust phase B gain pot A2A2R104 for same drive voltage as noted in step

2, plus or minus 2 millivolts.

5. Turn off ACS, remove phase B amplifier, install phase C amplifier in phase C slot. Turn on ACS. Program output

voltage for 300V, 60Hz, no load.

6. Measure drive voltage at A6TP3 as before. Adjust phase C gain pot A3A2R104 for same drive voltage as noted in

step 2, plus or minus 2 millivolts.

7. Turn off ACS, re-install phase A and phase B amplifiers in their respective slots.

Troubleshooting

Table 3-3. AC Power Source Troubleshooting Procedures

DANGER

Lethal voltages are present when

Instrument covers are removed.

Step Procedure Indication Action

Turn off ac mains, disconnect load, and configure unit for local sensing.

Turn on unit and verify that ac power is on by observing if front panel display is on and fans are on.

Turn off power supply and remove top cover as follows: Remove 9 screws from top and 3 screws from each side of unit. Lift cover straight up being careful of lip on front of cover.

Turn on supply and listen for clicking sound ( relays energizing ) on A9 Input assembly.

** See table 3-7 A14 Option 400 Bias PS verification

Relays energize but no front panel display and no fans. 300 Vdc on Cl.

** See table 3-4 A9 200/208 Input PS verification & table A10 Auxiliary PS verification. _______________________________ Option 400 500 Vdc across C9 &

C10 300 Vdc on C1.

** See table 3-5 A9 Option 400 Input PS verification.

No front panel, no fans, no relay click ?

No relay click, relays do not energize?

300 Vdc present ?

_____________________ 500 Vdc present ?

300 Vdc present ?

Check F1, F2, F3 on rear panel.

See fig 6-3 & 6-4 Check A9 1/4 amp fuse. Check 24 volt bias Option 400 models See fig 6-6,6-9&6-10 Check A14 Fl, F2, F3 Check 24 volt bias

No 300 Vdc then See fig 6-4 Check CR1, A9F2,F3,F4 A9K1,K2,K3 300 Vdc OK See fig 6-7 & 6-8 Check A10F1 ____________________ No 500 Vdc then See fig 6-6 Check CR1, A9F2,F3,F4 A9K1,K2 Check 24 V from A14 assembly No 300 Vdc then Check bias voltages from A14 assembly Replace A9 assembly

Relays energize, fans are on, but no front panel display.

+5VDC @ A10J6 ? See fig 6-7 & 6-14

Check voltages at A10J6 Check +5V at A8J724-7 to A8J724-2,4 common

Troubleshooting

Table 3-3. AC Power Source Troubleshooting Procedures (continued)

Step Procedure Indication Action

Relays energize, fans are on, but no front panel display. Press the [ Shift ] key a couple of times.

One or more outputs are missing. The following procedures will attempt to isolate the defective assembly by tracking the bias voltages, ac program signal or ac output signal.

Front panel display on, fans on.

Program VOLT 100, CURR:LEV 3, Output On using front panel keypad

for following procedures:

Tracking ac program signal.

See figure 3-2 AC Programming Signal Path.

Shift annuniciator on front panel toggles.

300 Vdc on Cl. Yes

300 Vdc on C1. No

All bias voltage present see fig 6-7. No

Check A8 DSP assembly. See figure 6-14

If 1.1 Vrms not present replace A8DSP assembly

Check +5Vhpib and +/-15V at A10J1, J2, J3. Check communication from A8 DSP to A11 front panel. A8 DSP assembly may be defective. Check A4F1,F2,F3 Fuses

Verify A9 Input PS see table 3-4 or 3-5. If option 400 model also verify A14 bias see table 3-7.

Verify all bias voltages are present. See table 3-6.

Measure 1.1 Vrms for Phase 1 A8U740-9 Phase 2 A8U770-9 Phase 3 A8U774-9 Common is J724-2,4.

Tracking AC output signal.

Also see Table 3-9 to verify A5 Relay/Filter assembly.

CAUTION – HIGH VOLTAGE To verify amplifier output connect test leads,

Check A6 Servo assembly. See figure 6-15

If 1.6 Vrms not present replace A6 Servo assembly. Check A5 Relay assembly.

Relays A5K5,A5K7 and A5K8 defective ? .

A1,A2,A3 amplifier assemblies are good if voltage

Measure 1.6Vrms at Phase 1 A6TP-3 Phase 2 A6TP-5 Phase 3 A6TP-7 Common at A6TP-1 Check 100 Vrms at Phase 1 A5TB1-1 Phase 2 A5TB1-3 Phase 3 A5TB1-4 Common at A5TB1-5

If 100 Vrms not present Then

Measure 100 Vrms at Phase 1 A5L1 Phase 2 A5L2 Phase 3 A5L3 Common at A5TP-8

Measure approx. 34 Vrms between:

Troubleshooting

One to outside end of C1 and the other to outside end of C3. ( outside end of capacitor is end toward edge of heatsink )

is present at C1/C3 connections ( measure 100 Vrms with 300 Vrms programmed )

A1C1 and A1C3 A2C1 and A2C3 A3C1 and A3C3 With 100 Vrms programmed.

Verify A4 mother board Note: See Switching Amplifier Balancing on page 22.

Table 3-4. A9 208/208 Input Power Supply Troubleshooting

Procedure Action

See figure 6-3 and 6-4 for test points and schematic.

Surge Limit Circuit 1. Measure resistance from Jl-l to Jl-7 or Jl-2 to Jl-8 or Jl-3 to Jl-6.

Resistance must be greater than 100 k ohms.

2. Apply 208 volts 50/60 Hz between E4 and E7.

3. Measure resistance from Jl-l to Jl-7 or Jl-2 to Jl-8 or Jl-3 to Jl-6. Resistance must be greater than 20 ohms.

Bias Voltages 1. Apply 208 volts 50/60 Hz between E4 and E7.

2. Voltage from ZR1 cathode (+) to TP1 (-) is between 23 and 25.5 Vdc.

3. Voltage from TP3 (+) to TP1 (-) is between +11.5 and 12.5 Vdc.

4. Voltage from ZR2 cathode (+) to TP4 is between 20 and 22 Vdc.

5. Voltage from ZR3 anode (+) to TP4 must be between –20 and -22 Vdc.

UVOV Detector 1. Apply 208 volts 50/60 Hz between E4 and E7.

2. Apply 300 Vdc (+) to El, (-) to E2. Verify voltage from U6-7(+) to TPI(-) is greater than 9 Vdc.

3. Lower 300 Vdc to 220 Vdc. Verify that voltage at U6-7 is less than 1 Vdc.

4. Raise 300 Vdc to 395 Vdc. Verify that voltage at U6-7 is less than 1 Vdc.

common mode choke

continuity. See figure 6-13 for

location of chokes.

If voltage is present at amplifier output ( C1/C3 connections) but not on A5 assembly check A5 assy.

Phase Loss Detector 1. Apply 208 volts 50/60 Hz between E4 and E7.

2. Verify that voltage from U4-7(+) to TP1(-) is less than 1 Vdc.

3. Apply 300 Vdc from Jl-l(+) to Jl-2(-). Verify that voltage from U4-7 to TP1(-) is greater than 9 Vdc. Remove 300 Vdc.

4. Apply 300 Vdc from Jl-2(+) to Jl-3(-). Verify that voltage from U4-7 to TP1(-) is greater than 9 Vdc. Remove 300 Vdc.

5. Apply 300 Vdc from Jl-3(+) to Jl-l(-). Verify that voltage from U4-7 to TP1(-) is greater than 9 Vdc. Remove 300 Vdc.

Table 3-5. A9 Option 400 (400V) Input Power Supply Troubleshooting

Caution: A 500Vdc power source plus external capacitors and inductors are required to verify the operation of the A9 option 400 volt AC Input assembly. For safety concerns only check fuses A9F1, A9F2 and A9F3. If this does not resolve the concern then replace the A9 option 400 AC Input assembly.

Troubleshooting

Table 3-6. A10 Auxiliary Power Supply Troubleshooting

Procedure Action

See figures 6-7 and 6-8 for test points and schematic.

Control Circuits 1. Apply 20 Vdc between TP7(+) and TP1(-).

2. Verify waveform at TP2 to TP1. 0 V to >15 V at approximately 60 kHz, duty cycle 40% to 50%.

3. Check drive to Ql and Q4 . Connect scope common to CR13 anode, verify waveform at gate drive resistors R10 and R28 is swinging between +12Vpk and –12Vpk at approximately 60 kHz, duty cycle 40 to 50%.

Outputs 1. Apply 20 Vdc between TP7(+) and TP1(-). Add a 10 ohm 25 W resistor across R13.

2. Apply 300 Vdc between Jl-1,2 (+) to Jl-5,6 (-).

3. Verify the 15 SW1 voltage across R13 is between 14.5 and 15.5 Vdc.

4. Verify the +5 GPIB voltage across R18 is between 4.8 and 5.2 Vdc.

5. Verify the +5V SEC voltage across R33 is between 4.2 and 5.2 Vdc.

6. Verify the fan voltage from J3-1 (+) to J3-5 (-) is between 14.6 and 15.8 Vdc.

Short J4-6 to J3-5 fan voltage should now be between 17.4 and 18.9 Vdc.

7. Verify the +15 analog supply across R43 is between 14.3 and 15.5 Vdc.

8. Verify the –15 analog supply across R48 is between 14.3 and 15.5 Vdc.

*A lower input voltage ( <300 Vdc ) can be used but the expected output voltages must be recalculated.

Table 3-7. A14 Option 400 Bias Power Supply Troubleshooting

Procedure Action

See figure 6-9 and 6-10 for test points and schematic.

Outputs 1. Apply 342 V 50/60 Hz between J2-1 and J2-4.

2. From TP1 (Lo) (Jl-7 ) to Jl-8 measure 26 Vdc +/- 2V.

3. From TP1 (Lo) (Jl-7 ) to Jl-6 measure 26 Vdc +/- 2V.

4. From TP2 (Lo) (Jl -3 ) to Jl -4 measure 19.3 Vdc +/- 2V.

5. From TP2 (Lo) (Jl-3 ) to Jl-2 measure -19.3 Vdc +/- 2V.

6. From TP3 (Lo) (J I -11 ) to J1 -1 0 measure 26 Vdc +/- 2V.

7. From TP2 (Lo) (Jl-3 ) to Jl-12 measure -26 Vdc +/- 2V.

*A lower input voltage ( <342 Vac ) can be used, but the expected output voltages must be recalculated.

Troubleshooting

Table 3-8. A4 Mother Board Troubleshooting

Procedure Action

See figure 6-13 for test points.

Inputs

Continuity check

Procedure Action

Range relays Program VOLT 50, CURR:LEV 3, Output On.

The following voltage tests verify that the correct input operational voltages are available to the A4 mother board. To test for these voltages, remove the Al, A2 and A3 amplifier assemblies. The +300 Vdc and 300 Vdc return are shown on Fig 6-13. The following input voltages appear at J2, J4 and J6. IA phase A high IB phase A common 2A +5V sec 2B *OVT 3A 3B D common 12A common 1 12B common 1 13A -15VSW 13B -15VSW 15A + 15VSW 15B +15VSW 16A + 15VSW1 16B + 15VSW1

Verify common mode inductors ( L1 thru L6 ) continuity. See A4 Mother Board Parts Location on Figure 6-13.

Table 3-9. A5 Relay / Filter Board Troubleshooting

See figure 6-11 and 6-12 for test points.

Program high range: Measure 25 volts from J2-1 to J2-3, J2-2 to J2-4, J2-5 to J2-7, J2-6 to J2-8, J2-9 to J2-11 and J2-10 to J2-12. Program low range: Measure 50 volts from J2-1 to J2-3, J2-2 to J2-4, J2-5 to J2-7, J2-6 to J2-8, J2-9 to J2-11 and J2-10 to J2-12.

Output enable / disable Relays

Sense relays Program ACL:INT: Measure greater than 10 megohms from R43 to K5 common, R44 to

Measure 50 volts from TB1-1 to TB1-6, TB1-3 to TB1-6 and TB1-4 to TB1-6. If voltages are not available, test voltage between relays K5, K7, K8 common terminal to determine defective relay.

K7 common, R45 to K8 common and R46 to K9 common. Program ACL:EXT: Measure approximately 105 Kohms from R43 to K5 common, R44 to K7 common, R45 to K8 common and R46 to K9 common.

Troubleshooting

Figure 3-1. Bias Voltage to Switching Amplifier Assemblies

A8 DSP Assembly

A6 Servo Assembly

A4 Mother Assembly

Remove A1 A2 A3

to access these connections

Phase A U740-9

Phas6 B U770-9

Phase C U774-9

J722-5

J723-11

J723-17

J2-5

J2-11

J2-17

TP1

TP3

TP5

TP7

J4-1 P1-1

J4-5 P1-5

J4-3 P1-3

Figure 3-2. AC Programming Signal Path

J2-1A Sig A Hi

J2-1B

J4-1A Sig B Hi

J4-1B

J6-1A Sig C Hi

J6-1B

Sig A com

Sig B com

Sig C com

Troubleshooting

Principles of Operation

Introduction

Figure 4-1 ( at end of this chapter ) is a block diagram showing the major circuits within the ac source. The ac source consists of the following modules:

Al, A2, A3 Switching Amplifiers Modules A4 Mother Board Assembly A5 Range Relay and Filter Assembly A6 Servo ( Control ) Assembly A7 IEEE488 ( GPIB ) & RS232 Interface Assembly A8 Digital Signal Processing ( DSP ) Assembly A9 Input Power Assembly A10 Auxiliary Power Supply Assembly Al 1 Front panel Assembly A12 Input Filter PC Assembly A13 Bridge Capacitor Filter Assembly A14 Bias Power Supply ( option 400 only )

General Description

The 3 phase input power is connected to TBl on the rear panel, then routed through Fl, F2 and F3 to the RFI filter, FLI, to relay Kl. The 3 phase input power is also connected to the A9 Input power assembly. When relay Kl closes the 3 phase input is connected to power rectifier CRl, Ll and Cl to create 300 Vdc required by the power amplifiers Al, A2 and A3. The amplifier assemblies in concert with the output filter and range relays produce the programmed waveform at the programmed frequency and voltage. The 300 Vdc is also used by the A10 Auxiliary power supply board to produce the bias voltages required by support circuits.

A1, A2, A3 Switching Amplifier Modules

The switching amplifier modules consist of a heat sink assembly, control board and power board. The 3 amplifier modules are identical and can be interchanged for troubleshooting assistance. The amplifier assemblies can only be replaced as a complete assembly, they are not repairable to the component level. The Agilent 6814B uses 2 amplifier assemblies connected in parallel to provide 3000 watts single phase AC output power. The Agilent 6834B uses 3 amplifier assemblies connected in a 3-phase configuration with each amplifier providing 1500 watts AC output power per phase. The 6843A uses three amplifiers connected in parallel to provide 4800 watts single phase AC output power. When an amplifier assembly is replaced it will be necessary to balance the amplifier, see paragraph on page 3-4 Switching Amplifier Output Balance Adjustments. Amplifiers from [ 6814A, 6834A ] or [ 6843A ] or [ 6814B, 6834B ] Models are NOT INTERCHANGABLE. See Chapter 5 Replaceable Parts listing for correct replacement assembly.

A4 Mother Board Assembly

The A4 mother board interconnects the Al, A2 and A3 amplifier assemblies with the A6 servo assembly, the 300 Vdc rail voltage and the +/-15 Vdc bias supply. There are 10 amp fuses located in the +300 Vdc line to each amplifier assembly. The Agilent 6814B and 6834B A4 assemblies are not interchangeable.

Principles of Operation

A5 Relay Range / Sense Assembly

The A5 assembly consists of the output voltage filters, the output voltage range relays A5Kl, A5K2 and A5K3, the output voltage disconnect relays A5K5, A5K6, A5K8 A5K9 and remote sense relays A5K4, A5K7 and all associated circuits. It also interconnects the A7 GPIB/RS232 assembly, A11 front panel assembly and A8 DSP assembly with each other and the trigger and DFI/RI signals. The Agilent 6814B and 6834B A5 assemblies are not interchangeable.

A6 Servo ( Control ) Assembly

The A6 servo or control assembly consists of the gate control circuits for the Al, A2 and A3 power amplifiers where required. It also contains the voltage and current control amplifiers and receives the voltage and current programming information from the A8 DSP assembly. It interconnects the range and protection signals between the A5 and A8 assemblies. This assembly is not component level repairable. The Agilent 6814B and 6834B A6 assemblies are not interchangeable.

A7 IEEE488 (GPIB) / RS232 Interface Assembly

The A7 interface contains the CPU and logic circuits for communicating with either an GPIB or RS232 computer/controller. This assembly is not component level repairable. This assembly is interchangeable with all AC power sources.

A8 Digital Signal Processing Assembly

The A8 DSP board contains the CPU, ROMs, Digital to Analog and Analog to Digital circuits to control the output voltage and output current settings. The A8 board also contains all the logic circuits for generating arbitrary waveforms, frequency changes and phase control. At power on the DSP board performs a self-test and will report a failure via the front panel display. This assembly is not component level repairable and is not interchangeable between an Agilent 6814B and 6834B.

A9 Input Power Assembly - ( 208 volt input )

The A9 input power assembly provides a current limit circuit to initially charge Cl to 300 Vdc, a phase loss detection circuit, the undervoltage / overvoltage detection circuits, and +/- l5VSW to the A10 auxiliary power supply assembly. When S1, on/off switch, is closed a single phase is used to power two bias transformers generating the +/-15 Vdc, 12 Vdc for the protection circuits and 24 Vdc to the current limit relays Kl, K2 and K3. There are 4 fuses on the A9 board. Fuse A9F1 is in series with Sl on/off switch, if A9F1 is open the Agilent 6834B will not function in any form. The remaining 3 fuses, A9F2, A9F3 and A9F4 are in series with the current limit resistors and relays. If all 3 fuses are open the unit will not function and if 1 or 2 fuses are open the phase loss status bit be true and full output power will not be available. This assembly is not component level repairable except for fuses. This assembly is interchangeable between an Agilent 6814B and 6834B.

A9 Input Power Assembly - ( 400 volt input )

The A9 input power assembly provides a current limit circuit to initially charge C9 and C10 to 550 Vdc, a step-down switching regulator to power the +300V on C1, a phase loss detection circuit and the undervoltage / overvoltage detection circuits. When S1, on/off switch, is closed a single phase is used to power three bias transformers on the A12 Bias board, The A12 Bias board provides +16 Vdc, +15 Vdc, -5 Vdc, 12 Vdc for the protection circuits and 24 Vdc to the current limit relays Kl and K2. There are 3 fuses on the A9 board. The 3 fuses, A9F2, A9F3 and A9F4 are in series with the current limit resistors and relays. If all 3 fuses are open the unit will not function and if 1 or 2 fuses are open the phase loss status bit be true and full output power will not be available. This assembly is not component level repairable except for fuses. This assembly is interchangeable between a 6814B and 6834B.

Principles of Operation

A10 Auxiliary Power Supply

The 300 Vdc is used by the A10 board to generate the bias voltages. The 300 Vdc input line is fused by a 1 ampere subminiature fuse, A10F1. The A10 supplies an isolated +5 Vdc for the A7 GPIB/RS232 interface board and A11 front panel board. The + 15 VSW dc to the A4 mother board via J2, the +/-15V and +5Vsec to the A6 servo board via J4 and +5V sec to the A8 DSP board via J5. It also supplies the 12-24 Vdc for the fan speed control. All secondary bias winding are fused with 1 ampere subminiature fuses A10F2 through A10F7. This assembly is not component level repairable except for fuses. This assembly is interchangeable between an Agilent 6814B and 6834B.

A11 Front Panel Display Assembly

The A11 assembly contains the display assembly, keypad, rotary pulse generators (RPG) and digital logic circuits, CPU and ROM. This assembly is not component level repairable. This assembly is interchangeable between an Agilent 6814B and 6834B.

A12 Input Filter Assembly

The A12 assembly contains resistor / capacitor networks connected line to line to reduce any magnetic noise from being conducted back into the AC input mains.

A13 Bridge Capacitor Filter Assembly

The A13 assembly contains capacitors and surge protectors connected line to line and a common mode inductor and surge protector connected in series with the + 300 Vdc bus. The filter is connected to reduce conducted and radiated noise generated by the three-phase rectifier.

A14 Bias Power Supply

This assembly is only used with the 400 volt input option. The A12 board provides the ac voltages required for the low voltage regulators and the +24 Vdc for the current limit relays on the A9 board. It also provides the +/-15VSW to the A10 Auxiliary board. Fuse F1 for the +24 Vdc, a LED will light on the A12 board if F1 opens. Fuse F2 and F3 for the +24 Vdc and + 16 Vdc. F4 and F5 for the +/-15VSW. F6 and F7 for the + 15 Vdc / -5 Vdc regulators. This assembly is interchangeable between an Agilent 6814B and 6834B.

Principles of Operation

Figure 4-1. AC Power Source, Block Diagram

Principles of Operation

Replaceable Parts

Introduction

This section lists the replaceable electrical and mechanical parts for the Agilent 6814B and 6834B AC Power Source/Analyzers and 6843A RTS.

Table 5-1. Agilent 6814B, 6834B & 6843A Replacement Assemblies

Reference Desig. Model / Input Option Agilent Part No. Description

ELECTRICAL PARTS

Al-A3 6814B, 6834B 5063-3415 Output Switching Amplifier Assembly

A1-A3 6843A 5060-9696 Output Switching Amplifier Assembly

A4 6814B 5060-9695 Mother Board Assembly A4 6834B, 6843A 5060-9673 Mother Board Assembly A5 6814B 06814-69001 Relay / Filter Assembly A5 6834B 06834-69001 Relay / Filter Assembly A5 6843A 06843-69021 Relay / Filter Assembly A6 6814B 06814-69002 Servo ( Control ) Assembly A6 6834B 06834-69002 Servo ( Control ) Assembly A6 6843A 5060-9607 Servo ( Control ) Assembly A7 6814B, 6834B 5060-3594 GPIB/RS232 Interface Assembly A7 6843A 5063-2376 GPIB/RS232 Interface Assembly A8 6814B 5063-3455 DSP ( 1P ) Assembly A8 6834B 5063-3456 DSP ( 3P ) Assembly A8 6843A 5063-2368 DSP ( 1P ) Assembly A9 6814B,6834B,6843A #208 5060-9671 AC Input Assembly

A9 6814B,6834B,6843A#400 5060-9675 AC Input Assembly A10 All Models 5060-9672 Auxiliary Power Supply Assembly A11 All Models 5060-3596 Front panel PC Assembly A12 6814B,6834B#208 5060-9689 Input Filter Assembly A12 6814B,6834B#400 5060-9688 Input Filter Assembly A13 6814B,6834B#208 5063-2390 Bridge Filter Capacitor Assembly A13 6814B,6834B#400 5063-2391 Bridge Filter Capacitor Assembly A14 6814B,6834B#400 5060-9687 Bias Power Supply Assembly A15 6814B, 6834B 5060-3597 BNC Assembly

A11G1,G2 All Models 0960-0912 RPG

A8U724 All Models 1818-4441 SRAM

A4F1-A4F3 All Models 2110-0911 15A-500V ( Buss KLM-15 )

A7F1 " 2110-0665 1A-250V A9F1 " 2110-0004 1/4A-250V

A9F2-A9F4 " 2110-0007 1A-250V Slo Blo

A10F1 " 2110-0991 2A-250V Subminature

A10F2 – A10F7 " 8159-0005 Zero Ohm Resistor

Replaceable Parts

Table 5-1. Agilent 6814B, 6834B & 6843A Replacement Assemblies (continued)

Reference Desig. Model / Input Option Agilent Part No. Description

ELECTRICAL PARTS

All Models 0360-2848 AC Input Terminal Block All Models 0360-2849 AC Output Terminal Block All Models 0370-3298 Knob All Models 1252-1488 4 Terminal DFI/RI Connector Plug All Models 1252-3698 7 Terminal Sense Connector Plug All Models 1510-0444 Terminal – ground rear panel All Models 2110-0397 Fuse holder – rear panel All Models 3101-3088 Switch All Models 3160-0306 Fan – tubeaxial – 4” All Models 3160-0929 Fan – blower – 6” All Models 5001-6794 Blinder All Models 5001-6796 Label, Front Panel Upper & Lower All Models 5001-9810 Cover, Fuse Holders All Models 5001-9811 Cover, AC Output Terminal Block All Models 5001-9838 Cover, Top All Models 5001-9839 Cover, Side All Models 5001-9872 Cover, AC Safety w/cable clamp

6814B/6834B 5002-1503 Rear Panel

6843A 5001-9870 Rear Panel All Models 5040-1698 Front Frame Lower All Models 5040-1702 Keypad All Models 5040-1703 Front Frame Upper All Models 5041-8801 Foot All Models 5063-2310 Rack Mount Slide Kit All Models 5080-2333 Window

6814B,6834B 5080-2455 Label, Rear Panel

6843A 5080-2334 Label, Rear Panel All Models 5962-0883 Guide, Quick Start All Models 5962-0885 Card, Quick Reference All Models 5962-0887 Guide, Users All Models 5962-0889 Guide, Programming

6843A 5962-0831 Guide, EN61000-3-2, EN61000-3-3, 60555

FL1 All Models 9135-0493 Filter - RFI

6814B 06814-80002 6814B Nameplate ( Superbug )

6834B 06834-80002 6834B Nameplate ( Superbug )

6843A 06843-80001 6843A Nameplate ( Superbug )

Note: See figure 6-2 for front frame mechanical assembly

Replaceable Parts

Diagrams

Introduction

This chapter contains drawings and diagrams for troubleshooting and maintaining the Agilent 6814B and 6834B AC Power Source/Analyzers. Unless otherwise specified in the drawings, a drawing or diagram applies to all models and input voltage options.

Table 6-1. General Schematic Notes:

1. All resistors are in ohms ± 1%, 1/8 W, unless otherwise specified.

2. All capacitors are in microfarads unless otherwise specified.

3. Unless otherwise noted, bias connections to integrated-circuit packages are as follows:

Common + 5 V

14-pin packages pin 7 pin 14 16-pin packages pin 8 pin 16 20-pin packages pin 10 pin 20

Diagrams

A7 HPIB

A8 Digital Signal Pro cessor DSP

A6 Se rvo

CR1

A5 Relay / Filter

A10 Aux power supply

A3 Output Switching Assembly

( not used on 6814A/B )

A4 mother board

A2 Outpuit Switching Assembly

A1 Output Switching Assembly

A11 Front Panel Assembly

A9 Input po wer

6814B, 6834B, 6843A Mechanical Layout 208/230 Volt Input

A7 HPIB

A8 DSP Ass emb ly

CR1

A6 Se rvo

A12 Bi as Powe r Supply

A5 Relay / Filter

A3 Output Switching Assembly

( not used on 6814A/B )

A2 Output Switching Assembly

A1 Output Switching Assembly

6814B, 6834B, 6843A Mechanical Layout 400 Volt Input

Figure 6-1. Mechanical Parts

A4 mother board

A11 Front Panel Assembly

A10 Aux power supply

C10

A9 Input power

Diagrams

Figure 6-2. 6814B, 6834B and 6843A Front Frame Assembly

Diagrams

Figure 6-3. A9 208/230V AC Input Board Parts Location

Figure 6-4. A9 208/230V AC Input Assembly Schematic

Diagrams

Figure 6-5. A9 400V AC Input Board Parts Location

Figure 6-6. A9 400V AC Input Assembly Schematic

Diagrams

Figure 6-7. A10 Auxiliary Power Supply Board Parts Location

Figure 6-8. A10 Auxiliary Power Supply Assembly Schematic

Diagrams

Figure 6-9. A14 Bias Power Supply Board Parts Location

Figure 6-10. A14 Bias Power Supply Assembly Schematic

Diagrams

Figure 6-11. A5 Range/Output/Phase Relay Schematic

Figure 6-12. A5 Range/Output/Phase Relay Driver Schematic

Diagrams

PHASE C

1516

1A 1B

C Lo

E20

+300V

COM2

16A 16B

141822

OUT Lo

OUT Hi

C Hi

E19

B Lo

E18

B Hi

E17

1A 1B

16A 16B

2526

16A 16B

COM2

+300V

OUT Lo

OUT H i

A Lo

E16

A Hi

E15

+300V

COM2

141822

COM2

OUT Lo

OUT Hi

+300V

OUT Lo

OUT Hi

COM2

+300V

L1 L2

+300V

COM2

141822

OUT Lo

OUT Hi

Diagrams

PHASE A PHASE B

COM2

+300V

OUT Lo

OUT Hi

COMMO N MO DE INDUCTER S L1, L2, L3, L4, L5 and L6

MOUNTED ON FAR SIDE OF A4 MOT HER ASSEMBLY

Figure 6-13. A4 Mother Board Parts Location

U715

U721

U735

U720

U723

U722

J724

J715

D COM

S700

U787

U711

U724

U712

U785

U774

U714

U737

U770

U783

U716

U741

U753

U781

U725

U740

U751

U736

U776

U773

+ 5V

+5V

DAC out phase C

DAC out pha se B

DAC out pha se A

U755

D COM

+ 5V UNREG ( 8-9 Vdc )

J721

J746

U754

J723

J722

Figure 6-14. A8 DSP Board Parts Location

Diagrams

+5VSEC +15V

TP 8

TP 9

TP 5

Phase 2

TP 1

COM

-15V

TP 7

TP 3TP 10

Phase 3

Phase 1

TP 4

TP 2TP 6

Diagrams

Figure 6-15 A6 Servo Board Test Point Location

Index

AC Power Source modules ..........................................................................................................................................31

calibration configuration switch...................................................................................................................................21

change sheets .................................................................................................................................................................8

clear password

switch position........................................................................................................................................................21

commands

CAL ON command .................................................................................................................................................20

EEINIT command...................................................................................................................................................20

conductive table mat......................................................................................................................................................8

conductive wrist strap....................................................................................................................................................8

configuration switch

for calibration .........................................................................................................................................................21

current limiting resistors ........................................................................................................................................32, 33

current-monitoring resistor ............................................................................................................................................9

electrostatic discharge..............................................................................................................................................8, 19

error code, over GPIB..................................................................................................................................................21

ESD..........................................................................................................................................................................8, 19

fan speed control..........................................................................................................................................................33

fault isolation ...............................................................................................................................................................21

firmware revisions ...................................................................................................................................................8, 20

Form, performance test record .....................................................................................................................................13

fuses

Al0F1-F7 fuse.........................................................................................................................................................33

A9F1-F4..................................................................................................................................................................32

AC main fuses.........................................................................................................................................................23

F2, F3, F4, F5 .........................................................................................................................................................33

subminature fuses Al0F2, Al0F7 ............................................................................................................................33

general description.......................................................................................................................................................31

hazardous voltages.........................................................................................................................................................7

hazards

shock.......................................................................................................................................................................19

Index (continued)

Index

*IDN query..................................................................................................................................................................20

inhibit cal

switch position........................................................................................................................................................21

initializing the unit.......................................................................................................................................................20

localizing problems......................................................................................................................................................19

manual backdating.........................................................................................................................................................8

manual changes sheet.....................................................................................................................................................8

manual revisions ............................................................................................................................................................8

measurement general techniques....................................................................................................................................9

microswitches

internal....................................................................................................................................................................21

modules

A10 auxiliary power supply....................................................................................................................................33

A11 front panel display assembly ...........................................................................................................................33

A12 input filter assembly........................................................................................................................................33

A13 bridge capacitor filter assembly ......................................................................................................................33

A14 bias power supply............................................................................................................................................33

A1, A2, A3 switching amplifier modules................................................................................................................31

A4 mother board assembly .....................................................................................................................................31

A5 relay range/sense assembly ...............................................................................................................................32

A6 servo control assembly......................................................................................................................................32

A7 IEEE-488 GPIB / RS-232 interface assembly...................................................................................................32

A8 digital signal processing assembly ....................................................................................................................32

A9 input power assembly..................................................................................................................................32, 33

interface assembly...................................................................................................................................................32

non-volatile memory corruption ..................................................................................................................................20

normal cal

switch position........................................................................................................................................................21

OUT-OF-RANGE error...............................................................................................................................................20

performance test record form.......................................................................................................................................13

performance test record sheets............................................................................................................................... 14-16

performance tests.........................................................................................................................................................10

procedures

troubleshooting .......................................................................................................................................................23

protective earth ground..................................................................................................................................................8

Index (continued)

Index

ram error ......................................................................................................................................................................21

reinitializing unit..........................................................................................................................................................20

related documents ..........................................................................................................................................................7

resistor

current-monitoring ....................................................................................................................................................9

revisions.........................................................................................................................................................................8

ROM replacement........................................................................................................................................................20

ROM update ................................................................................................................................................................20

ROM versions..............................................................................................................................................................20

safety considerations..................................................................................................................................................3, 7

safety warnings ..............................................................................................................................................................7

serial number .................................................................................................................................................................4

serial number prefix.......................................................................................................................................................4

shock hazards...............................................................................................................................................................19

test equipment required............................................................................................................................................9, 19

tests

cv load effect...........................................................................................................................................................11

cv source effect.......................................................................................................................................................11

frequency programming..........................................................................................................................................10

harmonic distortion.................................................................................................................................................12

readback accuracy...................................................................................................................................................10

rms current accuracy...............................................................................................................................................12

voltage programming ..............................................................................................................................................10

troubleshooting

test equipment.........................................................................................................................................................19

troubleshooting hints....................................................................................................................................................22

troubleshooting procedure ...........................................................................................................................................19

troubleshooting table....................................................................................................................................................23

*TST? query ................................................................................................................................................................19

undervoltage / overvoltage detection circuits...............................................................................................................32

updating ROM versions...............................................................................................................................................20

using *IDN query.........................................................................................................................................................20

verification.....................................................................................................................................................................9

Index

Manual Updates

The following updates have been made to this manual since the print revision indicated on the title page.

7/99

The Digital Voltmeter Characteristics on page 9 have been corrected.

The Output Balance Adjustments on page 22 have been updated.

Step 6 on page 23 has been corrected.

The note on the bottom of page 25 has been updated.

The fuses, rear panel, and rear panel label part numbers in table 5-1 have been updated (pp. 35-6)

11/99

The serial numbers on the title page have been updated.

The instrument identification section on page 4 has been updated.

Figures 2-1 and 2-1 have been updated.

The part number for FL1 has been added to table 5-1.

Agilent Technologies 6814B, 6834B, 6843A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WARRANTY

SAFETY CONSIDERATIONS

Printing History

Table of Contents

Introduction

Scope

Safety Considerations

Revisions

Electrostatic Discharge

Performance Tests

Test Equipment Required

General Measurement Techniques

Current-Monitoring Resistor

Performance Tests

Troubleshooting

Test Equipment Required

Troubleshooting Procedure

Firmware Revisions

Calibration Configuration Switch

Troubleshooting Hints

Switching Amplifier Output Balance Adjustments

Principles of Operation

General Description

Diagrams

Index