Keithley 7999-6 Service manual

Model 7999-6GPIB RF Relay Unit

Instruction Manual

A GREATER MEASURE OF CONFIDENCE

W ARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a
period of 1 year from date of shipment.

Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables,
rechargeable batteries, diskettes, and documentation.

During the warranty period, we will, at our option, either repair or replace any product that proves to be
defective.

To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in
Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation
prepaid, to the indicated service facility . Repairs will be made and the product returned, transportation prepaid.
Repaired or replaced products are warranted for the balance of the original warranty period, or at least 90 days.

LIMIT A TION OF W ARRANTY

This warranty does not apply to defects resulting from product modification without Keithley’s express written
consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non­rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow
instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUD­ING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE.
THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.

NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR
ANY DIRECT , INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF
THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS
BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAM­AGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION,
LOSSES SUSTAINED AS THE RESULT OF INJURY T O ANY PERSON, OR DAMAGE T O PROPER TY.

Keithley Instruments, Inc.

BELGIUM: Keithley Instruments B.V.
CHINA: Keithley Instruments China
FRANCE: Keithley Instruments Sarl
GERMANY: Keithley Instruments GmbH
GREAT BRITAIN: Keithley Instruments Ltd
INDIA: Keithley Instruments GmbH
ITALY: Keithley Instruments s.r.l.
NETHERLANDS: Keithley Instruments B.V.
SWITZERLAND: Keithley Instruments SA
TAIWAN: Keithley Instruments Taiwan

• 28775 Aurora Road • Cleveland, OH 44139 • 440-248-0400 • Fax: [phone] • http://www.k eithley.com

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Y uan Chen Xin Building, Room 705 • 12 Y umin Road, De wai, Madian • Beijing 100029 • 8610-62022886 • Fax: [phone]

3, allée des Garays • 91127 Palaiseau Cedex • 01-64 53 20 20 • Fax: [phone]

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Flat 2B, WILOCRISSA • 14, Rest House Crescent • Bangalore 560 001 • 91-80-509-1320/21 • Fax: [phone]
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Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: [phone]

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1 Fl. 85 Po Ai Street • Hsinchu, Taiwan, R.O.C. • 886-3572-9077 • Fax: [phone]

4/01

Model 7999-6 GPIB RF Relay Unit

Instruction Manual

©2001, Keithley Instruments, Inc.

All rights reserved.
Cleveland, Ohio, U.S.A.
First Printing, April 2001

Document Number: 7999-6-901-01 Rev. A

Manual Print History

The print history shown below lists the printing dates of all Revisions and Addenda created
for this manual. The Revision Le vel letter increases alphabetically as the manual under goes sub­sequent updates. Addenda, which are released between Revisions, contain important change in­formation that the user should incorporate immediately into the manual. Addenda are numbered
sequentially . When a new Re vision is created, all Addenda associated with the previous Re vision
of the manual are incorporated into the new Revision of the manual. Each ne w Revision includes
a revised copy of this print history page.

Revision A (Document Number 7999-6-901-01)............................................................ April 2001

All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand names are trademarks or registered trademarks of their respective holders.

Safety Precautions

The following safety precautions should be observed before using this product and any associated in­strumentation. Although some instruments and accessories would normally be used with non-hazardous
voltages, there are situations where hazardous conditions may be present.

This product is intended for use by qualified personnel who recognize shock hazards and are familiar
with the safety precautions required to avoid possible injury. Read the operating information carefully
before using the product.

The types of product users are:

Responsible body

ensuring that the equipment is operated within its specifications and operating limits, and for ensuring
that operators are adequately trained.

Operators

and proper use of the instrument. They must be protected from electric shock and contact with hazardous
live circuits.

Maintenance personnel

setting the line voltage or replacing consumable materials. Maintenance procedures are described in the
manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be
performed only by service personnel.

Service personnel

ucts. Only properly trained service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are rated Installation Category I and

Installation Category II, as described in the International Electrotechnical Commission (IEC) Standard
IEC 60664. Most measurement, control, and data I/O signals are Installation Category I and must not
be directly connected to mains voltage or to voltage sources with high transient over-voltages. Installa­tion Category II connections require protection for high transient over-v oltages often associated with lo­cal AC mains connections. The user should assume all measurement, control, and data I/O connections
are for connection to Category I sources unless otherwise marked or described in the Manual.

Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable con­nector jacks or test fixtures. The American National Standards Institute (ANSI) states that a shock haz­ard exists when voltage lev els greater than 30V RMS, 42.4V peak, or 60VDC are present.

practice is to expect that hazardous voltage is present in any unknown circuit before measuring.

Users of this product must be protected from electric shock at all times. The responsible body must en­sure that users are prevented access and/or insulated from every connection point. In some cases, con­nections must be exposed to potential human contact. Product users in these circumstances must be
trained to protect themselves from the risk of electric shock. If the circuit is capable of operating at or
above 1000 volts,

Do not connect switching cards directly to unlimited power circuits. They are intended to be used with
impedance limited sources. NEVER connect switching cards directly to AC mains. When connecting
sources to switching cards, install protective devices to limit fault current and voltage to the card.

Before operating an instrument, make sure the line cord is connected to a properly grounded power re­ceptacle. Inspect the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks be­fore each use.

When installing equipment where access to the main power cord is restricted, such as rack mounting, a
separate main input power disconnect device must be provided, in close proximity to the equipment and
within easy reach of the operator.

is the individual or group responsible for the use and maintenance of equipment, for

use the product for its intended function. They must be trained in electrical safety procedures

are trained to work on live circuits, and perform safe installations and repairs of prod-

no conductive part of the circuit may be exposed.

perform routine procedures on the product to keep it operating, for example,

A good safety

For maximum safety , do not touch the product, test cables, or an y other instruments while po wer is applied to
the circuit under test. ALWAYS remove power from the entire test system and discharge an y capacitors before:
connecting or disconnecting cables or jumpers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.

Do not touch any object that could provide a current path to the common side of the circuit under test or power
line (earth) ground. Alw ays make measurements with dry hands while standing on a dry, insulated surface ca­pable of withstanding the voltage being measured.

The instrument and accessories must be used in accordance with its specifications and operating instructions
or the safety of the equipment may be impaired.

Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications
and operating information, and as shown on the instrument or test fixture panels, or switching card.

When fuses are used in a product, replace with same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth

ground connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation

requires the use of a lid interlock.
If a scre w is present, connect it to safety earth ground using the wire recommended in the user documentation.

!

The symbol on an instrument indicates that the user should refer to the operating instructions located in
the manual.

The symbol on an instrument shows that it can source or measure 1000 volts or more, including the com­bined effect of normal and common mode voltages. Use standard safety precautions to av oid personal contact
with these voltages.

The

WARNING

read the associated information very carefully before performing the indicated procedure.

CAUTION

The
invalidate the warranty.

Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits, including the

power transformer, test leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses,
with applicable national safety approvals, may be used if the rating and type are the same. Other components
that are not safety related may be purchased from other suppliers as long as they are equivalent to the original
component. (Note that selected parts should be purchased only through Keithley Instruments to maintain ac­curacy and functionality of the product.) If you are unsure about the applicability of a replacement component,
call a Keithley Instruments office for information.

To clean an instrument, use a damp cloth or mild, water based cleaner. Clean the exterior of the instrument
only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Prod­ucts that consist of a circuit board with no case or chassis (e.g., data acquisition board for installation into a
computer) should never require cleaning if handled according to instructions. If the board becomes contami­nated and operation is affected, the board should be returned to the factory for proper cleaning/servicing.

heading in a manual explains dangers that might result in personal injury or death. Always

heading in a manual explains hazards that could damage the instrument. Such damage may

Rev. 2/01

7999-6 GPIB RF Relay Unit

Relay Specifications

CONNECTOR TYPE:

Input: Female SMA connector (on relay).
Output: N-type.

CONTACT LIFE: 5 ×10
ACTUATION TIME: 15ms.
FREQUENCY RANGE: DC to 4GHz. Relay paths are 50Ω terminated

when open.

INSERTION LOSS: 0.3dB + 0.115
ISOLATION: 100dB minimum; 130dB typical.
SWR: 1.2 maximum.

INTERFACE: GPIB (IEEE-488.2) and SCPI.
INDICATORS: Power, relay position status and error LED.
CONTACT CLOSURE COUNTERS: One counter per relay path, up to

10 million counts each, maintained in non-volatile memory.

MAXIMUM COMMON MODE: 42V peak, any terminal to earth.
MAXIMUM SWITCHING SIGNAL: 1W CW, CAT I.
POWER: User-supplied 24VDC (22VDC min., 30VDC max.), 1.8A max.
ENVIRONMENT: Operating: 0° to 40°C, up to 35°C <80% RH.

EMC: Conforms with European Union Directive 89/336/EEC.
SAFETY: Conforms with European Union Directive 73/23/EEC.
DIMENSIONS: 429mm long × 133mm wide × 161mm deep (19.00˝ ×

5.25˝ × 6.34˝).

ACCESSORIES SUPPLIED: Instruction manual.

Specifications are subject to change without notice.

6

cycles minimum; 10 × 10

×

frequency (in GHz).

GENERAL

Storage: –25° to 65°C.

6

typical.

Simplified Schematic

SBG 4/9/01

Rev. A

T able of Contents

1 General Information

Introduction ................................................................................ 1-2

Feature overview ........................................................................ 1-2

Warranty information ................................................................. 1-2

Manual addenda ......................................................................... 1-2

Safety symbols and terms .......................................................... 1-3

Specifications ............................................................................. 1-3

Unpacking and inspection .......................................................... 1-3

Inspection for damage ......................................................... 1-3

Handling precautions .......................................................... 1-3

Shipment contents ............................................................... 1-4

Instruction manual .............................................................. 1-4

Repacking for shipment ...................................................... 1-4

Connections ................................................................................ 1-4

2 Connections

Introduction ................................................................................ 2-2

Handling precautions ................................................................. 2-2

Configuration ............................................................................. 2-2

Layout ................................................................................. 2-2

Simplified schematic ........................................................... 2-4

Connections ................................................................................ 2-5

GPIB control connection ..................................................... 2-5

Power connector .................................................................. 2-8

3 Operation

Introduction ................................................................................ 3-2

Maximum signal considerations ................................................ 3-2

Bus operation (GPIB) ................................................................. 3-3

Bus connections .................................................................. 3-3

Primary address ................................................................... 3-3

Programming syntax ........................................................... 3-3

Response messages ............................................................. 3-7

Status model ............................................................................... 3-8

Event register sets ............................................................. 3-10

Enable registers ................................................................. 3-11

Queues ............................................................................... 3-11

Status byte and SRQ ......................................................... 3-13

Service request enable register .......................................... 3-14

Serial polling and SRQ ..................................................... 3-15

Clearing registers and queues ................................................... 3-16

Programming enable registers .................................................. 3-17

Reading registers ............................................................... 3-17

Common commands ................................................................. 3-18

GPIB commands ....................................................................... 3-26

ROUTe commands ............................................................ 3-26

:CLOSe............................................................................... 3-28

:CONFigure........................................................................ 3-29

STATus commands ............................................................ 3-30

:QUEue............................................................................... 3-30

SYSTem commands .......................................................... 3-32

Manual operation ...................................................................... 3-34

Switching considerations .......................................................... 3-35

Connector integrity ............................................................ 3-35

Voltage Standing Wave Ratio ............................................ 3-35

Path isolation ..................................................................... 3-36

Insertion loss ..................................................................... 3-36

RFI/EMI ............................................................................ 3-36

Errors ........................................................................................ 3-37

4 Service Information

Introduction ................................................................................ 4-2

Handling and cleaning precautions ............................................ 4-2

Handling precautions ........................................................... 4-2

Card and connector cleaning ............................................... 4-2

Performance verification ............................................................. 4-3

Environmental conditions .................................................... 4-3

Recommended equipment ................................................... 4-3

Channel resistance tests ....................................................... 4-3

Replacing components ................................................................ 4-4

Replacement parts ............................................................... 4-4

Replacement precautions ..................................................... 4-5

Soldering considerations ..................................................... 4-5

Relay replacement ............................................................... 4-5

Circuit board removal .......................................................... 4-8

GPIB address .............................................................................. 4-8

5 Replaceable Parts

Introduction ................................................................................ 5-2

Parts list ...................................................................................... 5-2

Ordering information .................................................................. 5-2

Factory service ............................................................................ 5-2

Component layout ...................................................................... 5-2

List of Illustrations

2 Connections

Figure 2-1 General layout (front panel) ................................................... 2-3

Figure 2-2 General layout (rear panel) .................................................... 2-4

Figure 2-3 Simplified schematic .............................................................. 2-4

Figure 2-4 GPIB control connector ......................................................... 2-7

Figure 2-5 Power connector .................................................................... 2-8

3 Operation

Figure 3-1 Command diagram ................................................................. 3-5

Figure 3-2 Controlling relay connections ................................................ 3-6

Figure 3-3 Status model structure ........................................................... 3-9

Figure 3-4 Standard event status ............................................................ 3-10

Figure 3-5 Status byte and service request (SRQ) ................................. 3-13

Figure 3-6 16-bit status register ............................................................. 3-17

Figure 3-7 Standard event enable register ............................................. 3-20

Figure 3-8 Standard event status register ............................................... 3-21

Figure 3-9 Service request enable register ............................................ 3-23

Figure 3-10 Status byte register ............................................................... 3-25

Figure 3-11 Manual operation ................................................................. 3-34

4 Service Information

Figure 4-1 Channel resistance test connections ....................................... 4-4

Figure 4-2 Model 7999-6 exploded view ................................................ 4-6

Figure 4-3 GPIB address switch example ............................................... 4-9

List of T ables

2 Connections

Table 2-1 GPIB control connector terminals ......................................... 2-6

Table 2-2 Power connector pinouts ........................................................ 2-8

3 Operation

Table 3-1 Parameter types ...................................................................... 3-4

Table 3-2 SCPI commands — error queue .......................................... 3-12

Table 3-3 Common and SCPI commands — reset registers and

Table 3-4 IEEE-488.2 common commands and queries ...................... 3-18

Table 3-5 :ROUTe subsystem command set ........................................ 3-27

Table 3-6 :STATus subsystem command set ........................................ 3-30

Table 3-7 :SYSTem subsystem command set ...................................... 3-32

Table 3-8 Error and status message ...................................................... 3-37

4 Service Information

Table 4-1 Recommended verification equipment .................................. 4-3

5 Replaceable Parts

Table 5-1 Parts list—electronic components ......................................... 5-3

Table 5-2 Parts list—mechanical parts ................................................... 5-5

clear queues .................................................................... 3-16

1

General Information

1-2 General Information

Introduction

This section contains general information about the Model 7999-6 GPIB RF Relay. The

information is organized as follows:

• Feature overview

• Warranty information

• Manual addenda

• Safety symbols and terms

• Specifications

• Unpacking and inspection

• Connections

If you have any questions after reviewing this information, please contact your local
Keithley representative or call one of our Applications Engineers at 1-800-KEITHLEY.
Worldwide phone numbers are listed at the front of this manual.

Feature overview

The Model 7999-6 is an IEEE-488 controlled, single or dual, 4 or 6 pole, 19-inch rack
mounted relay unit. Additional features of the Model 7999-6 are as follows:

• N-type bulkhead connectors (insulated)

• +24VDC power connections

• LED indicators for error, power, and relay status

• Operating range to 4GHz (relay dependent)

• Can be upgraded from 4-pole to 6-pole relays

W arranty information

Warranty information is located at the front of this instruction manual. Should your Model
7999-6 require warranty service, contact the Keithley representative or authorized repair facil­ity in your area for further information. When returning the Model 7999-6 for repair, be sure to
fill out and include the service form at the back of this manual to provide the repair facility with
the necessary information.

Manual addenda

Any improvements or changes concerning the Model 7999-6 or manual will be explained in
an addendum included with the manual. Be sure to note these changes and incorporate them
into the manual.

Safety symbols and terms

The following symbols and terms may be found on the Model 7999-6 or used in this manual.

The symbol indicates that the user should refer to the operating instructions

!

located in the manual.

The

symbol

dard safety precautions to avoid personal contact with these voltages.

The

WARNING

injury or death. Always read the associated information very carefully before performing the
indicated procedure.

The

CAUTION

Such damage may invalidate the warranty.

shows that high voltage may be present on the terminal(s). Use stan-

heading used in this manual explains dangers that might result in personal

heading used in this manual explains hazards that could damage the switch.

Specifications

Full Model 7999-6 specifications are included at the front of this manual.

General Information 1-3

Unpacking and inspection

Inspection for damage

The Model 7999-6 is packaged in a re-sealable, anti-static bag to protect it from damage due
to static discharge and from contamination that could degrade its performance. Before remov­ing the Model 7999-6 from the bag, observe the precautions on handling discussed below.

Handling precautions

• Always grasp the Model 7999-6 by the covers. Do not touch board surfaces or
components.

• After removing the Model 7999-6 from its anti-static bag, inspect it for any obvious
signs of physical damage. Report any such damage to the shipping agent immediately.

• When the Model 7999-6 is not installed and connected, keep the unit in its anti-static
bag and store it in the original packing carton.

1-4 General Information

Shipment contents

The following items are included with every Model 7999-6 order:

• Model 7999-6 GPIB Relay Unit (single or dual 4-pole/6-pole IEEE-488 controlled
relay switch)

• Model 7999-6 Instruction Manual (this manual)

• Additional accessories as ordered

Instruction manual

If an additional Model 7999-6 Instruction Manual is required, order the manual package,
Keithley part number 7999-6-901-00. The manual package includes an instruction manual and
any pertinent addenda.

Repacking for shipment

Should it become necessary to return the Model 7999-6 for repair, carefully pack the unit in
its original packing carton or the equivalent, and follow these instructions:

• Call the Repair Department at 1-800-552-1115 for a Return Material Authorization
(RMA) number.

• Advise as to the warranty status of the Model 7999-6.

• Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping
label.

• Fill out and include the Service Form located at the back of this manual.

Connections

The following are available Model 7999-6 connections:

• Power receptacle: 9-pin D-sub connector

• IEEE-488 port (GPIB connector)

• N-type bulkhead connectors

NOTE

Refer to Section 2 for detailed connection information.

2

Connections

2-2 Connections

Introduction

This section contains information about overall switch configuration and connections and is

organized as follows:

• Handling precautions

• Configuration

• Connections

WARNING

The procedures in this section are intended only for qualified service per­sonnel. Do not perform these procedures unless you are qualified to do so.
Failure to recognize and observe normal safety precautions could result in
personal injury or death.

Handling precautions

To maintain high-impedance isolation, care should be taken when handling the switch to
avoid contamination from foreign materials such as body oils. Such contamination can reduce
isolation resistance. To avoid possible contamination:

• Always grasp the switch by the handles or the relay housing.

• Do not touch bulkhead connector insulators.

• Operate the switch in a clean environment. If the switch becomes contaminated, it
should be thoroughly cleaned as explained in Section 4.

Configuration

Layout

Figure 2-1 and Figure 2-2 show the general layout of the Model 7999-6 featuring the

following:

Connectors:

• Power receptacle (9-pin male D-sub connector)

• GPIB Control: IEEE-488 interface connector

• N-type insulated bulkhead input connectors

Indicators:

• Power LED

• ERR LED (communication error or failed power on self-test)

• Relay state LEDs (one for each relay pole)

Switches:

• Manual toggle switch (one per relay)

Figure 2-1

X225

X201

2

General layout (front panel)

7999-6 GPIB RF RELAY UNIT

OPEN
ALL

1

STEP POS.

RELAY 1

2

(1-6)

3

4

X225 X201 X202 X226 X203

Connections 2-3

5

6

PWRERR

MS CODE: 00309

1

3

4

5

6

OPEN

ALL

STEP POS.

(1-6)

OPEN

ALL

STEP POS.

X204

(1-6)

X225 X203

RELAY 1

1

2

3

4

5

6

PWRERR

X201

Relay 1 Manual
toggle switch

Relay 1 state LEDs

Power LED

ERR LED

RELAY 2

1

2

3

4

Relay 2 state LEDs

5

6

OPEN

ALL

STEP POS.

(1-6)

Relay 2 Manual
toggle switch

Output

connectors

Input connectors
(N-type, insulated
from chassis)

2-4 Connections

Figure 2-2

General layout (rear panel)

Power connector GPIB connector

Simplified schematic

Figure 2-3 shows a simplified schematic diagram of the Model 7999-6. The solid lines rep-

resent a 4-pole relay; the additional dashed lines represent a 6-pole relay.

Figure 2-3

Simplified schematic

Output

Connections

2

INPUT POWER

(24 VDC)

CATI

WARNING

NO INTERNAL OPERATOR
SERVICABLE PARTS, SERVICE
BY QUALIFIED PERSONNEL ONLY.

42V MAX.

ANY CONDUCTOR

MS CODE: 00313

MADE IN

(SET IEEE ADDRESS INTERNALLY)

U.S.A

RELAY #1RELAY #2

IEEE-488

X201

3

5

6

1

4

X202

X203

X204

X225

X226

Connections

GPIB control connection

The GPIB control port is connected to the GPIB port of a computer (controller) using a

shielded IEEE-488 interface cable with metric mating screws.

Remember the following restrictions when attaching instruments to the GPIB:

If you cannot meet these requirements, the use of bus extenders is recommended.

Connections 2-5

– A maximum separation of 4 meters between any two instruments on the bus.
– A maximum total cable length of 20 meters.
– No more than 15 devices on the bus.
– No two instruments having the same address.

CAUTION

Connectors may be stacked to allow a number of parallel connections to one instrument.

Two screws located on a standard connector maintain secure connections between connectors.

NOTE

Connect devices to the GPIB as follows:

1. Line up the cable connector with the connector located on the Model 7999-6. The con­nector’s design allows installation to the port in only one position.

2. Secure connector by tightening screws firmly (do not overtighten).

3. Add any additional connectors to the port as required.

4. Connect the free end of the cable to the controller.

5. Check that the GPIB address and other GPIB protocol information is properly set. (See
Section 4 of this manual for GPIB address information.)

IEEE-488 common is connected to digital common. Maximum voltage
between digital common and earth ground is 0V.

To minimize interference caused by electromagnetic radiation, use shielded
IEEE-488 cables.

2-6 Connections

Table 2-1

GPIB control connector terminals

* Numbers in parentheses refer to signal ground return of referenced contact

Contact

Number IEEE-488 designation Type

01 DI01 Data
02 DI02 Data
03 DI03 Data
04 DI04 Data
05 EOI (24)* Management
06 DAV Handshake
07 NRFD Handshake
08 NDAC Handshake
09 IFC Management

10 SRQ Management
11 ATN Management
12 SHIELD Ground
13 DI05 Data
14 DI06 Data
15 DI07 Data
16 DI08 Data
17 REN (24)* Management
18 Gnd (6) * Ground
19 Gnd (7) * Ground
20 Gnd (8) * Ground
21 Gnd (9) * Ground
22 Gnd (10) * Ground
23 Gnd (11) * Ground
24 Gnd, LOGIC Ground

number. EOI and REN signal lines return on contact 24.

Figure 2-4

GPIB control connector

Connections 2-7

12

24

1

13

GPIB address

On the main circuit board, there are five GPIB address DIP switches. When shipped from
the factory, the GPIB address is set to 3. To change the GPIB address of the relay, refer to
Section 4 of this manual.

2-8 Connections

Power connector

properly wired (UL listed cable with a 9-PIN D-subminiature female connector—the Model
7999-6 power connector’s pinouts are shown in Figure 2-5 with the pin descriptions contained
in Table 2-2).

Connect the 24VDC power supply to the power connector. Make sure the power supply is

WARNING

Table 2-2

Power connector pinouts

Pin Number Description

1, 2 Positive (+)

4, 5 Negative (-)

6, 7, 8, 9 (Not used)

Figure 2-5

Power connector

Pin 1

Pin 6 Pin 9

To prevent damage to the Model 7999-6 and to prevent the risk of electric
shock, use only a properly rated power supply. The power supply must be
double insulated, have the required safety agency approvals for the low
voltage directives, EMC directives, and CE certification. It must also pro­vide output current limiting and short-circuit protection.

3 (Not used)

Pin 5

3

Operation