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OPERATING AND
SERVICE MANUAL

Relay Accessories
Agilent Models 59510A, 59511A

Agilent Part No. 5957-6382

Serial Numbers:

Agilent Model 59510A, Serials US29080101 and Above
Agilent Model 59511A, Serials US29060101 and Above

* This manual also applies to instruments with the older serial number format described on page 7.

Microfiche Part No. 5957-6383 Printed in USA: April, 1988
SAFETY SUMMARY
The following general safety precautions must be observed during all phases of operation, service, and repair of this
instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety
standards of design, manufacture, and intended use of the instrument. Agilent Technologies Company assumes no liability
for the customer's failure to comply with these requirements.

BEFORE APPLYING POWER.
Verify that the product is set to match the available line voltage and the correct fuse is installed.

GROUND THE INSTRUMENT.
This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis
and cabinet must be connected to an electrical ground. The instrument must be connected to the ac power supply mains through a three-
conductor power cable, with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. For instruments
designed to be hard-wired to the ac power lines (supply mains), connect the protective earth terminal to a protective conductor before any
other connection is made. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will
cause a potential shock hazard that could result in personal injury. If the instrument is to be energized via an external autotransformer for
voltage reduction, be certain that the autotransformer common terminal is connected to the neutral (earthed pole) of the ac power lines
(supply mains).

FUSES.
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 IN AN EXPLOSIVE ATMOSPHERE.
Do not operate the instrument in the presence of flammable gases or fumes.

KEEP AWAY FROM LIVE CIRCUITS.
Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified
service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even
with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before
touching components.

DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

DO NOT EXCEED INPUT RATINGS.
This instrument may be equipped with a line filter to reduce electromagnetic interference and must be connected to a properly grounded
receptacle to minimize electric shock hazard. Operation at line voltages or frequencies in excess of those stated on the data plate may
cause leakage currents in excess of 5.0 mA peak.

SAFETY SYMBOLS.

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

Indicates hazardous voltages.

Indicate earth (ground) terminal.

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

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

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the
instrument. Return the instrument to an Agilent Technologies Sales and Service Office for service and repair to ensure that safety features
are maintained.

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

2
Table of Contents

General Information............................................................................................................................................................... 5
Introduction .......................................................................................................................................................................... 5
Description (Figure 1-1) ....................................................................................................................................................... 5
Specifications........................................................................................................................................................................ 7
Safety Considerations ........................................................................................................................................................... 7
Instrument and Manual Identification................................................................................................................................... 7
Options ................................................................................................................................................................................. 7

Installation............................................................................................................................................................................. 10
Introduction ........................................................................................................................................................................ 10
Initial Inspection ................................................................................................................................................................. 10
Mounting ............................................................................................................................................................................ 10
Surface Mounting ........................................................................................................................................................... 10
Option 850 Mounting ..................................................................................................................................................... 11
Input Power Requirements.................................................................................................................................................. 12
Power Cord ......................................................................................................................................................................... 13

Connections and Operating Information............................................................................................................................ 15
Introduction ........................................................................................................................................................................ 15
Agilent 595lXA Front Panel ............................................................................................................................................... 15
DC Power Connections....................................................................................................................................................... 17
Sense Lead Connections ..................................................................................................................................................... 18
Remote Sensing .............................................................................................................................................................. 18
Local Sensing (Figure 3-3) ............................................................................................................................................. 19
Agilent 603XA Configuration ............................................................................................................................................ 19
Switch Settings ............................................................................................................................................................... 20
CONFIG Switches ...................................................................................................................................................... 20
RLY LINK or INH/ FLT Switch ................................................................................................................................ 22
Agilent 603XA/5951XA Serial Data Connection........................................................................................................... 22
Agilent 603XA/5951XA Configuration Wake-Up State ................................................................................................ 22
Remote Inhibit (INH) and Fault (FLT) Lines ................................................................................................................. 23
INH Input Line ........................................................................................................................................................... 24
FLT Output Line......................................................................................................................................................... 24
Using INH and FLT with Multiple Agilent 603XA/5951XA's................................................................................... 24
Agilent 603XA Status PoII ............................................................................................................................................. 24
Agilent 603XA/5951XA Turn-On Sequence.................................................................................................................. 25
General Purpose Configuration........................................................................................................................................... 26
Switch Settings ............................................................................................................................................................... 27
Agilent 603X LINK or LOGIC CONTROL Switch ................................................................................................... 27
Listen Enable Switch .................................................................................................................................................. 27
TTL Input Connections................................................................................................................................................... 27
LISTEN ENABLE Input. ........................................................................................................................................... 28
OPEN/CLOSE Signal ................................................................................................................................................. 28
NORM/REVInput (Applies only to Agilent Model 59511A). .................................................................................... 28
Remote Inhibit (INH) and Fault (FLT) Lines ................................................................................................................. 28

3
Agilent 603XA Programming Commands .......................................................................................................................... 31
Introduction ........................................................................................................................................................................ 31
Changed Command............................................................................................................................................................. 32
Output On/Off................................................................................................................................................................. 32
Added Commands............................................................................................................................................................... 34
DC On/Off ...................................................................................................................... ................................................ 34
Relay On/Off .................................................................................................................................................................. 35
Polarity Normal/Reverse (Model 59511A only)............................................................................................................. 35

Maintenance .......................................................................................................................................................................... 37
Introduction ........................................................................................................................................................................ 37
Circuit Operation ................................................................................................................................................................ 37
Main Circuit Board ......................................................................................................................................................... 37
Control Circuits .......................................................................................................................................................... 37
Bias Supply................................................................................................................................................................. 38
Power-on Circuit......................................................................................................................................................... 38
Relays ......................................................................................................................... .................................................... 39
Verification......................................................................................................................................................................... 40
Relay Control Verification (TTL Mode) ........................................................................................................................ 40
DC Power Relay Verification ......................................................................................................................................... 41
Removal and Replacement Procedures............................................................................................................................... 42
Cover .......................................................................................................................... .................................................... 42
Assembly Removal......................................................................................................................................................... 43
Main Circuit Board Removal.......................................................................................................................................... 43
Troubleshooting Procedures ............................................................................................................................................... 43
Test Setup ..................................................................................................................... .................................................. 43
Bias Supply and Power-On Circuit................................................................................................................................. 44
Microprocessor U101 ..................................................................................................................................................... 44
Relay Circuits ................................................................................................................................................................. 45
Agilent Model 59510A. .............................................................................................................................................. 45
Agilent Model 59511A. .............................................................................................................................................. 45
FLT and INH Circuits..................................................................................................................................................... 46
Parts List..................................................................................................................... ........................................................ 47

Agilent Sales and Support offices ........................................................................................................................................56

4
1
General Information

Introduction

This manual contains instructions for installing, operating and troubleshooting the Agilent Model 59510A and 59511A
Relay Accessories. Each of these models is designed for use with the Agilent 6030A, 6032A, 6033A, and 6038A models in
the Agilent 603XA series of system power supplies. The Agilent 59510A and Agilent 59511A Relay Accessories can be
used with Agilent 603XA supplies that have the following serial numbers:

Agilent Model Serial Numbers *
6030A 2811A-00815 and above
6031A** 2817A-00983 and above
6032A 2818A-03121 and above
6033A 2817A-03452 and above
6038A 2817A-05426 and above

* Models with lower serial numbers can be modified to operate with the Agilent 595XA Relay Accessory. Consult Agilent
regarding a retrofit kit for these models.

**When the Agilent 5951XA Relay Accessory is to be used with the Agilent 6031A System DC Power Supply, care must be
taken to set the Agilent 6031A's current limit to 60 A or less. The Agilent 6031A power supply is capable of delivering
an output current in excess of Agilent 5951XA's rating of 60 A, which could cause damage to the Relay Accessory.

Wherever applicable, the instructions given in this manual refer to pertinent information provided in the Operating and
Service Manual for the appropriate Agilent 603XA power supply as follows:

Agilent Model Manual Agilent P/N
6030A 06030-90003
6031A 06031-90003
6032A 06032-90005
6033A 06033-90010
6038A 06038-90003

The Relay Link Supplement, Appendix F (Agilent Part No. 5957-6388) to the above manuals, describes circuit changes to
the Agilent 603X supplies which allow use of the supplies with the Agilent 59510A/59511A. The Agilent 59510A/59511A
Relay Accessory has a logic control input (TTL levels) that allows it to be used with power supplies or devices other than
the supplies specified above. Instructions for using the logic control input in a general purpose configuration are given in
Section 3 of this manual.

Description (Figure 1-1)

The Agilent 59510A and 59511A Relay Accessories are intended for use in power supply applications where either or both
load isolation (connect/disconnect) and polarity reversal are required.

The Agilent 59510A Relay Accessory provides for load connect/disconnect for both the power output and sense leads of the
power supply. The Agilent 59511A Relay Accessory provides for polarity reversal as well as for load connect/disconnect
for both power output and sense leads. In addition, each model includes a fault (FLT) output line and a remote inhibit (INH)
input line. The FLT output line provides a fault reporting capability that is independent of the GPIB service request (SRQ)

General Information 5
function. The INH input line provides a way to remotely disconnect (also independent of GPIB computer control) the power
supply output.

Figure 1-lA shows the Agilent 59510A/59511A Relay Accessory configured with an Agilent 603XA power supply. A GPIB
interface in the Agilent 603XA power supply recognizes relay commands from the computer and provides serial data to the
Agilent 59510A/59511A via a special connection labeled RLY LINK. The Agilent 5951XA converts the serial data into
relay control signals.

The computer can control the connect/disconnect and polarity reversal (Agilent 59511A only) functions via the Agilent
603XA supply's serial data link to the Agilent 59510A/59511A. The closing and opening of the relays in the Agilent
59510A/59511A can be coordinated with the enabling and disabling of the power supply output to allow switching the
relays when the power supply output is disabled in order to prolong relay life. The microprocessor within the Agilent
59510A/59511A Relay Accessory properly sequences the power and sense relays to minimize overshoots at the power
supply output.

Figure 1-lB shows the Agilent 59510A/59511A Relay Accessory configured in a general purpose application. This
configuration allows the Agilent 59510A/59511A to be used with power supplies or devices other than Agilent 603XA
power supplies. Logic control inputs are provided that allow TTL logic levels to control the connect/disconnect and polarity
reversal (Agilent 59511A) functions. The logic control inputs have pull-up resistors which allow them to accept signals from
relays or open-collector devices.

The Agilent 59510A/59511A Relay Accessory is designed to fit in a rack height of 5