Keithley 7037 Service manual

I

nstruction Manua

l

7

Model 703

Single-Pole Relay-Digital I/O Card

Contains Operating and Servicing Information

7037-901-01 Rev. A / 5-97

WARRANTY

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 representati v e, 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.

LIMITATION OF WARRANTY

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, non-rechargeable 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 TO ANY PERSON, OR DAMAGE TO PROPERTY.

Keithley Instruments, Inc. • 28775 Aurora Road • Cleveland, OH 44139 • 216-248-0400 • Fax: [phone] • http://www.keithley.com

CHINA: Keithley Instruments China • Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-62022886 • Fax: [phone]
FRANCE: Keithley Instruments SARL • BP 60 • 3 Allée des Garays • 91122 Palaiseau Cédex • 33-1-60-11-51-55 • Fax: [phone]
GERMANY: Keithley Instruments GmbH • Landsberger Strasse 65 • D-82110 Germering, Munich • 49-89-8493070 • Fax: [phone]
GREAT BRITAIN: Keithley Instruments, Ltd. • The Minster • 58 Portman Road • Reading, Berkshire RG30 1EA • 44-118-9575666 • Fax: [phone]
ITALY: Keithley Instruments SRL • Viale S. Gimignano 38 • 20146 Milano • 39-2-48303008 • Fax: [phone]
NETHERLANDS: Keithley Instruments BV • Avelingen West 49 • 4202 MS Gorinchem • 31-(0)183-635333 • Fax: [phone]
SWITZERLAND: Keithley Instruments SA • Kriesbachstrasse 4 • 8600 Dübendorf • 41-1-8219444 • Fax: [phone]
TAIWAN: Keithley Instruments Taiwan • 1FL., 1, Min Yu First Street • Hsinchu, Taiwan, R.O.C. • 886-35-778462 • Fax: [phone]

Model 7037 Single-Pole Relay-Digital I/O Card

Instruction Manual

©1997, Keithley Instruments, Inc.

All rights reserved.
Cleveland, Ohio, U.S.A.
First Printing, May 1997

Document Number: 7037-901-01 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
Level letter increases alphabetically as the manual undergoes 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 Revision is created, all Addenda associated with the previous Revision of the manual are
incorporated into the new Revision of the manual. Each new Revision includes a revised copy of this print history page.

Revision A (Document Number 7037-901-01)........................................................................................ May 1997

All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand and product 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 is the individual or group responsible for the use

and maintenance of equipment, and for ensuring that operators are
adequately trained.

Operators use the product for its intended function. They must be

trained in electrical safety procedures and proper use of the instru­ment. They must be protected from electric shock and contact with
hazardous live circuits.

Maintenance personnel perform routine procedures on the product

to keep it operating, for example, 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 are trained to work on live circuits, and perform

safe installations and repairs of products. Only properly trained ser­vice personnel may perform installation and service procedures.

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 levels greater than 30V RMS, 42.4V
peak, or 60VDC are present. A good safety practice is to expect

that hazardous voltage is present in any unknown circuit bef ore
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, no conductive part of the circuit may be

exposed.

As described in the International Electrotechnical Commission
(IEC) Standard IEC 664, digital multimeter measuring circuits
(e.g., Keithley Models 175A, 199, 2000, 2001, 2002, and 2010)
measuring circuits are Installation Category II. All other instru­ments’ signal terminals are Installation Category I and must not be
connected to mains.

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.

For maximum safety, do not touch the product, test cables, or any
other instruments while power is applied to the circuit under test.
ALWAYS remove power from the entire test system and discharge
any 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.
Always make measurements with dry hands while standing on a
dry, insulated surface capable of withstanding the voltage being
measured.

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 screw 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
avoid personal contact with these voltages.

The WARNING heading in a manual explains dangers that might
result in personal injury or death. Alw ays read the associated infor ­mation very carefully before performing the indicated procedure.

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 the 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.

The CAUTION heading in a manual explains hazards that could
damage the instrument. Such damage may invalidate the warranty.

Table of Contents

1 General Information

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

Features............................................................................................................................................................... 1-1

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

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

Safety symbols and terms ................................................................................................................................... 1-2

Specifications...................................................................................................................................................... 1-2

Unpacking and inspection................................................................................................................................... 1-2

Inspection for damage................................................................................................................................. 1-2

Handling precautions ...................................................................................................................................1-2

Shipping contents........................................................................................................................................ 1-2

Instruction manual....................................................................................................................................... 1-3

Repacking for shipment ...................................................................................................................................... 1-3

Optional accessories............................................................................................................................................ 1-3

2 Relay Switch Configuration

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

Basic switch configuration (SPST)..................................................................................................................... 2-1

3 Digital I/O Configuration

Introduction......................................................................................................................................................... 3-1

Digital outputs..................................................................................................................................................... 3-1

Controlling pull-up devices................................................................................................................................. 3-1

Controlling devices using pull-up resistors......................................................................................................... 3-2

Digital inputs....................................................................................................................................................... 3-2

i

4 Card Connections and Installation

Introduction ......................................................................................................................................................... 4-1

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

Digital I/O connections........................................................................................................................................ 4-2

Voltage source jumper................................................................................................................................. 4-2

Pull-up resistors........................................................................................................................................... 4-2

Configuring digital I/O output logic............................................................................................................ 4-4

Configuring digital I/O input pull-up resistance ......................................................................................... 4-4

Multi-pin (mass termination) connector card...................................................................................................... 4-5

Typical relay switch connection scheme........................................................................................................... 4-10

Typical digital I/O connection schemes ............................................................................................................ 4-11

Output connection schemes....................................................................................................................... 4-11

Input connection scheme........................................................................................................................... 4-12

Model 7037 installation and removal................................................................................................................ 4-13

Card installation......................................................................................................................................... 4-13

Card removal............................................................................................................................................. 4-13

5 Operation

Introduction ......................................................................................................................................................... 5-1

Power limits......................................................................................................................................................... 5-1

Digital I/O maximum signal levels.............................................................................................................. 5-1

Relay switch maximum signal levels.......................................................................................................... 5-1

Reactive loads.............................................................................................................................................. 5-1

Mainframe control of the card............................................................................................................................. 5-2

Channel assignments................................................................................................................................... 5-3

Closing and opening channels..................................................................................................................... 5-5

Scanning channels....................................................................................................................................... 5-5

Reading input channels................................................................................................................................ 5-6

IEEE-488 bus operation .............................................................................................................................. 5-6

Measurement considerations ............................................................................................................................... 5-8

Path isolation............................................................................................................................................... 5-8

Magnetic fields............................................................................................................................................ 5-8

Radio frequency interference ...................................................................................................................... 5-9

Ground loops............................................................................................................................................... 5-9

Keeping connectors clean.......................................................................................................................... 5-10

AC frequency response.............................................................................................................................. 5-10

ii

6 Service Information

Introduction......................................................................................................................................................... 6-1

Handling and cleaning precautions..................................................................................................................... 6-1

Performance verification..................................................................................................................................... 6-2

Environmental conditions ........................................................................................................................... 6-2

Recommended equipment........................................................................................................................... 6-2

Card connections......................................................................................................................................... 6-2

Channel resistance tests .............................................................................................................................. 6-3

Offset current tests ...................................................................................................................................... 6-4

Contact potential tests................................................................................................................................. 6-5

Channel to channel isolation tests............................................................................................................... 6-5

Common-mode isolation tests..................................................................................................................... 6-8

Channel functionality test ................................................................................................................................... 6-9

Special handling of static-sensitive devices........................................................................................................ 6-9

Principles of operation ...................................................................................................................................... 6-10

Block diagram........................................................................................................................................... 6-10

ID data circuits.......................................................................................................................................... 6-11

Relay control............................................................................................................................................. 6-12

Relay power control.................................................................................................................................. 6-12

Digital I/O output channel control ............................................................................................................ 6-12

Digital I/O input channel control .............................................................................................................. 6-12

Power-on safeguard................................................................................................................................... 6-12

Troubleshooting ................................................................................................................................................ 6-13

Troubleshooting equipment ...................................................................................................................... 6-13

Troubleshooting access............................................................................................................................. 6-13

Troubleshooting procedure ....................................................................................................................... 6-14

7 Replaceable Parts

Introduction......................................................................................................................................................... 7-1

Parts lists ..............................................................................................................................................................7-1

Ordering information .......................................................................................................................................... 7-1

Factory service.................................................................................................................................................... 7-1

Component layouts and schematic diagrams...................................................................................................... 7-1

Index

iii

List of Illustrations

2 Relay Switch Configuration

Figure 2-1 Model 7037 relay switch configuration (simplified schematic) ................................................................. 2-1

3 Digital I/O Configuration

Figure 3-1 Output configuration for pull-up devices.................................................................................................... 3-1

Figure 3-2 Output configuration using pull-up resistance ............................................................................................ 3-2

Figure 3-3 Input configuration...................................................................................................................................... 3-2

4 Card Connections and Installation

Figure 4-1 Voltage source jumper for output channels ................................................................................................ 4-2

Figure 4-2 Component locations - connector board ..................................................................................................... 4-3

Figure 4-3 Voltage source jumper installation ............................................................................................................. 4-3

Figure 4-4 Digital I/O output logic location ................................................................................................................. 4-4

Figure 4-5 Digital I/O output logic selection................................................................................................................ 4-4

Figure 4-6 Digital I/O input pull-up resistance selection.............................................................................................. 4-5

Figure 4-7 Multi-pin connector card terminal identification ........................................................................................ 4-6

Figure 4-8 Typical round cable connection techniques ................................................................................................ 4-8

Figure 4-9 Model 7011-MTR connector pinout ........................................................................................................... 4-9

Figure 4-10 Model 7011-KIT-R (with cable) assembly................................................................................................. 4-9

Figure 4-11 Typical connection scheme for Model 7037............................................................................................. 4-10

Figure 4-12 Digital output, solenoid control ................................................................................................................ 4-11

Figure 4-13 Digital output, motor control .................................................................................................................... 4-11

Figure 4-14 Digital output, logic device control........................................................................................................... 4-12

Figure 4-15 Digital input, monitoring micro-switches................................................................................................. 4-12

Figure 4-16 Model 7037 card installation in Model 7001............................................................................................ 4-13

v

5 Operation

Figure 5-1 Limiting inductive reaction voltage............................................................................................................. 5-2

Figure 5-2 Limiting capacitive reaction current............................................................................................................ 5-2

Figure 5-3 Model 7001 channel status display.............................................................................................................. 5-3

Figure 5-4 Model 7022 channel status display (slot 1) ................................................................................................. 5-3

Figure 5-5 Channel display organization ...................................................................................................................... 5-3

Figure 5-6 Model 7037 programming channel assignments......................................................................................... 5-4

Figure 5-7 Path isolation resistance .............................................................................................................................. 5-8

Figure 5-8 Voltage attenuation by path isolation resistance ......................................................................................... 5-8

Figure 5-9 Power line ground loops.............................................................................................................................. 5-9

Figure 5-10 Eliminating ground loops............................................................................................................................ 5-9

6 Service Information

Figure 6-1 Channel resistance testing ........................................................................................................................... 6-3

Figure 6-2 Offset current testing ................................................................................................................................... 6-4

Figure 6-3 Contact potential testing.............................................................................................................................. 6-5

Figure 6-4 Channel to channel testing........................................................................................................................... 6-6

Figure 6-5 Common-mode isolation testing.................................................................................................................. 6-8

Figure 6-6 Testing an input or output channel .............................................................................................................. 6-9

Figure 6-7 Model 7037 block diagram........................................................................................................................ 6-10

Figure 6-8 Start and stop sequences............................................................................................................................ 6-11

Figure 6-9 Transmit and acknowledge sequence ........................................................................................................ 6-11

vi

List of Tables

4 Card Connections and Installation

Table 4-1 Mass termination accessories...................................................................................................................... 4-5

Table 4-2 Multi-pin connector card terminal designation cross-reference.................................................................. 4-7

6 Service Information

Table 6-1 Verification equipment ............................................................................................................................... 6-2

Table 6-2 Channel to channel isolation tests............................................................................................................... 6-7

Table 6-3 Recommended troubleshooting equipment............................................................................................... 6-13

Table 6-4 Troubleshooting procedure ....................................................................................................................... 6-14

7 Replaceable Parts

Table 7-1 Relay card for Model 7037 parts list............................................................................................................7-2

Table 7-2 Mass terminated connector card for Model 7037 parts list..........................................................................7-3

Table 7-3 Model 7011-KIT-R 96-pin female DIN connector kit parts list..................................................................7-3

vii

1

General Information

Introduction

This section contains general information about the Model
7037 single-pole relay-digital I/O card.

The Model 7037 consists of a multi-pin (mass termination)
connector card and a relay card. External test circuit connec­tions are made via the 96-pin male DIN connector on the
connector card. Keithley offers a v ariety of optional accesso­ries that can be used to make connections to the connector
card. (See the available accessories at the end of this section.)

The rest of Section 1 is arranged in the following manner:

• Features

• Warranty information

• Manual addenda

• Safety symbols and terms

• Specifications

• Unpacking and inspection

• Repacking for shipment

• Optional accessories

Features

The Model 7037 has 30 independent channels of single-pole
switching. It also has ten independent inputs and outputs for
digital I/O capabilities. Some of the key features include:

• Low contact potential and offset current for minimal
effects on low-level signals.

• High density switching and control.

• High capacity digital output sink of 250mA.

• 1A pathway current carrying capacity.

• High isolation resistance >1G Ω for minimal load
effects.

• Model 7011-KIT-R connector kit that includes a 96-pin
female DIN connector that will mate directly to the con­nector on the Model 7037 or to a standard 96-pin male
DIN bulkhead connector (see Model 7011-MTR). This
connector uses solder cups for connections to external
circuitry and includes an adapter for a round cable and
the housing.

1-1

General Information

Warranty information

Warranty information is located at the front of this instruc­tion manual. Should your Model 7037 require warranty ser­vice, contact the Keithley representativ e or authorized repair
facility in your area for further information. When returning
the card for repair, be sure to fill out and include the service
form at the back of this manual in order to provide the repair
facility with the necessary information.

Manual addenda

Any improvements or changes concerning the card or man­ual will be explained in an addendum included with the card.
Addenda are provided in a page replacement format. Replace
the obsolete pages with the new pages.

Safety symbols and terms

The following symbols and terms may be found on an instru­ment or used in this manual.

!

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

The symbol on an instrument shows that high voltage
may be present on the terminal(s). Use standard safety pre­cautions to avoid personal contact with these voltages.

The WARNING heading used in this manual explains dan­gers that might result in personal injury or death. Always
read the associated information very carefully before per­forming the indicated procedure.

The CAUTION heading used in this manual explains haz­ards that could damage the card. Such damage may invali­date the warranty.

Specifications

Model 7037 specifications are found at the front of this man­ual. These specifications are exclusive of the mainframe
specifications.

Unpacking and inspection

Inspection for damage

The Model 7037 is packaged in a resealable, anti-static bag
to protect it from damage due to static discharge and from
contamination that could degrade its performance. Before
removing the card from the bag, observe the following pre­cautions on handling.

Handling precautions

1. Always grasp the card by the side edges and shields. Do
not touch the board surfaces or components.

2. When not installed in a Model 7001/7002 mainframe,
keep the card in the anti-static bag and store it in the
original packing carton.

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

Shipping contents

The following items are included with every Model 7037
order:

• Model 7037 Single-Pole Relay-Digital I/O Card

• Model 7011-KIT-R 96-pin Female DIN Connector Kit

• Model 7037 Instruction Manual

• Additional accessories as ordered

1-2

General Information

Instruction manual

The Model 7037 Instruction Manual is three-hole drilled so
it can be added to the three-ring binder of the Model 7001 or
7002 Instruction Manual. After removing the plastic wrap­ping, place the manual in the binder following the mainframe
instruction manual. Note that a manual identification tab is
included and should precede the Model 7037 Instruction
Manual.

If an additional instruction manual is required, order the
manual package, Keithley part number 7037-901-00. The
manual package includes an instruction manual and any per­tinent addenda.

Repacking for shipment

Should it become necessary to return the Model 7037 for
repair, carefully pack the unit in its original packing carton,
or the equivalent, and include the following information:

• Advise as to the warranty status of the card.

• Write ATTENTION REPAIR DEPARTMENT on the
shipping label.

• Fill out and include the service form located at the back
of this manual.

Optional accessories

The following accessories are available for use with the
Model 7037:

Model 7011-MTC-2  This two-meter round cable assem-

bly is terminated with a 96-pin female DIN connector on
each end. It will mate directly to the connector on the Model
7037 and to a standard 96-pin male DIN bulkhead connector
(see Model 7011-MTR).

Model 7011-MTR  This 96-pin male DIN bulkhead con-

nector uses solder cups for connections to external circuitry.
It will mate to the Model 7011-KIT-R connector and Model
7011-MTC-2 cable assembly.

1-3

IN1

OUT1

One of 30 Channels

2 -

2

Relay Switch Configuration

Introduction

This section covers the basic single-pole, single-throw
(SPST) switch configuration.

Basic switch configuration (SPST)

A simplified schematic of the Model 7037 relay switch con­figuration is shown in Figure 2-1. The card has 30 indepen­dent channels. Each channel is made up of a single-pole,
single-throw (SPST), normally open (NO) switch.

Figure 2-1

Model 7037 relay switch configuration
(simplified schematic)

1

3

Digital I/O Configuration

Introduction

This section covers the basic digital input and output config­urations for the Model 7037. Connection information for
these configurations is provided in Section 4 of this manual,
while operation (front panel and IEEE-488 bus) is explained
in Section 5.

Digital outputs

Output channels are user configurable for negative (low) or
positive (high) true logic. That is, the output can be high or
low when the channel is turned on (closed) depending upon
user configuration. Conversely, the output can be high or low
when the channel is turned off (open). Refer to Section 4 to
configure the logic to your requirement.

7037

Jumper

5V

10kΩ

Controlling pull-up devices

T ypically , the digital outputs are used to provide driv e for rel­atively high current devices such as solenoids, relays, and
small motors. The configurations for these applications are
shown in Figure 3-1. Figure 3-1 allows you to use an external
voltage source (V) for devices that require a higher voltage
(42V maximum). An internal jumper is used to select the
internal pull-up voltage. At the factory, the internal 5V
source is selected.

Each output channel uses a fly-back diode for protection
when switching an inductive device, such as a solenoid coil.
This diode diverts the potentially damaging fly-back voltage
away from the driver.

V

(42V maximum)

V

EXT

Solenoid or
relay coil

Driver

Figure 3-1

Output configuration for pull-up devices

NOTE: Output configuration uses

an external voltage source
(42V maximum).

3-1

Digital I/O Configuration

7037

Jumper

5V

Driver

Figure 3-2

Output configuration using pull-up resistance

R

10kΩ

V

EXT

P

GND

+V

A

Or

B

Gate

Device

Y

Logic

Controlling devices using pull-up resistors

CAUTION

Failure to set J201 to the Vext position
when using external pull-up voltages
may result in damage to the output
drivers.

When interfacing outputs to high-impedance devices (i.e.,
logic devices), internal pull-up resistors are used to
achieve the appropriate logic level. Figure 3-2 shows the
output configuration using the 10k Ω pull-up resistor (Rp).

The configuration in Figure 3-2 uses the internal 5V source
as the high logic level. If you need a higher logic level, you
can place the jumper in the alternate position and apply an
external voltage (via V

EXT

).

Digital inputs

Input channels use positive true logic but can be pulled up or
pulled down based on the configuration of the pull-up resis­tor. Each channel uses a 10k Ω pull-up resistor (R
up resistors can be pulled up to 5V or pulled down to ground
depending on the positioning of the jumper on the input
logic bank. Refer to Section 4 for more information. Figure
3-3 shows the resistor being pulled up to 5V.

). The pull-

1

When the resistor is connected to 5V, the channel is pulled
high. Thus, with nothing connected to the channel, the input
is pulled high to 5V which displays the channel as on.

When the resistor is connected to ground, the channel is
pulled low. Thus, with nothing connected to the channel, the
input is pulled low to ground which displays the channel as
off.

The digital input is compatible with external TTL logic.
Each built-in pull-up resistor provides level shifting so
devices such as micro-switches can be monitored. Each input
has a protection network that clamps the input at 5.7V. This
allows logic levels up to 42V peak to be monitored.

7037

5V

R

1

R

2

10kΩ

R

= Pull-up resistor

1

R

= Input protection resistor

2

10kΩ

INPUT

GND

3-2

Figure 3-3

Input configuration

4

Card Connections and

Installation

Introduction

WARNING

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

The information in this section is arranged as follows:

• Handling precaution — Explains precautions that

must be followed to prevent contamination to the card.
Contamination could degrade the performance of the
card.

• Digital I/O connections — Explains the voltage source
jumpers, pull-up resistors, output logic, and input resis­tance and how to configure them.

• Multi-pin (mass termination) connector card — Cov-

ers the basic connections to the 96-pin DIN male con­nector and identifies each terminal.

• Typical relay switch connection scheme — Provides

a typical connection scheme for a relay switch
configuration.

• Typical digital I/O connection schemes — Provides

some typical connection schemes for output solenoid,
relay, motor, and logic device control and for input
micro-switch monitoring.

• Model 7037 installation and removal — Provides the

procedures to install and remove the card from the
Model 7001/7002 mainframe.

4-1

Card Connections and Installation

Handling precautions

To maintain high impedance isolation, care should be taken
when handling the relay and connector cards to avoid con­tamination from such foreign materials as body oils. Such
contamination can substantially lower leakage resistances,
thus degrading performance.

To avoid possible contamination, always grasp the relay and
connector cards by the side edges or shields. Do not touch
the board surfaces or components. On connectors, do not
touch areas adjacent to the electrical contacts. Dirt buildup
over a period of time is another possible source of contami­nation. To avoid this problem, operate the mainframe and
card in a clean environment.

If a card becomes contaminated, it should be thoroughly
cleaned as explained in Section 6.

Digital I/O connections

Voltage source jumper

Digital output high uses the internal +5V source as the high
logic level. If higher voltages are required, a user-supplied
voltage can be used (42V maximum). At the factory, the
internal jumper is set to use the internal +5V source.

CAUTION

A plug-in jumper for the bank allows you to select the inter­nal +5V source or an external source. In Figure 4-1, the
banks are using the external voltage source.

5V

J201

V

ext

39
40

U203

31
32
33

34

35
36

U201 U202

37
38

Figure 4-1

Voltage source jumper for output channels

The voltage source jumper is located on the connector board
as shown in Figure 4-2. Figure 4-3 shows how the plug-in
jumper is installed on J201.

Pull-up resistors

When interfacing outputs to high-impedance devices (i.e.,
logic devices), pull-up resistors are used to achieve the
appropriate logic level. These resistors are installed at the
factory.

Failure to set J201 to the Vext position
when using external pull-up voltages
may result in damage to the output
drivers.

4-2

Card Connections and Installation

U203

Figure 4-2

Component locations — connector board

Jumper

V

EXT

A. 5V Source Selected

U201 U202

5V

V

J201

5V

Vext

Jumper

EXT

B. External Source Selected

5V

Figure 4-3

Voltage source jumper installation

4-3

Card Connections and Installation

Configuring digital I/O output logic

Referring to Figure 4-4 for the digital I/O output logic loca­tion, perform the following steps to configure J101:

1. If mated together, separate the relay card from the con­nector card by removing the mounting screw and then
pulling the two cards away from each other. Remember
to only handle the cards by the edges and shields to
avoid contamination.

2. Locate J101 on the relay board. Refer to Figure 4-4.

3. Determine if you require positive (high) or negative
(low) logic.

4. Install the plug-in jumper in the appropriate position as
shown in Figure 4-5.

WARNING: USER SUPPLIED LETHAL VOLTAGES MAY BE

PRESENT ON CONNECTORS OR P.C. BOARD.

Jumper

High Low

A. High Selected

Jumper

High Low

HIGH

DOWN

LOGIC

OUTPUT

INPUT LOGIC

LOW

UP

J101

J100

Figure 4-4

Digital I/O output logic location

B. Low Selected

Figure 4-5

Digital I/O output logic selection

Configuring digital I/O input pull-up
resistance

Referring to Figure 4-4 for digital I/O input pull-up resis­tance location, perform the following steps to configure
J100:

1. If mated together, separate the relay card from the con­nector card by removing the mounting screw and then
pulling the two cards away from each other. Remember
to only handle the cards by the edges and shields to
avoid contamination.

2. Locate J100 on the relay board. Refer to Figure 4-4.

3. Determine if you require pull-up (5V) or pull-down
(ground) input logic.

4. Install the plug-in jumper in the appropriate position as
shown in Figure 4-6.

4-4

Card Connections and Installation

Jumper

Down Up

A. Pull-down Resistance

Jumper

Down Up

B. Pull-up Resistance Selected

Keithley has a variety of cable and connector accessories
available to accommodate connections from the connector
card to test instrumentation and DUTs (devices under test).
In general, these accessories, which are summarized in
Table 4-1, utilize a round cable assembly for connections.

Table 4-1

Mass termination accessories

Model Description

7011-KIT-R 96-pin female DIN connector and hous-

ing for round cable (provided with the
Model 7037 card).

7011-MTC-2 Two-meter round cable assembly termi-

nated with a 96-pin female DIN connec­tor on each end.

7011-MTR 96-pin male DIN bulkhead connector.

Terminal identification for the DIN connector of the multi­pin connector card is provided by Table 4-2 and Figure 4-7.
This connector will mate to a 96-pin female DIN connector.

Figure 4-6

Digital I/O input pull-up resistance selection

Multi-pin (mass termination) connector card

Since connections to external circuitry are made at the 96-pin
male DIN bulkhead connector, there is no need to separate
the connector card from the relay card. If the connector card
is separated from the relay card, carefully mate them
together. Make sure to handle the cards by the edges and
shields to avoid contamination.

4-5

Card Connections and Installation

3231302928272625242322212019181716151413121110987654321

c
b
a

View from pin side
of connector

5V

Relay

Channel

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

10K

Schematic
Designator

OUT

IN

43

75

13

74

12

44

45

77

15

76

14

46

47

79

17

78

16

48

49

81

19

80

18

50

51

83

21

82

20

52

53

85

23

84

22

54

55

87

25

86

24

56

57

89

27

88

26

58

59

91

29

90

28

60

61

93

31

92

30

62

Schematic
Connector

IN
11c
10c
12b
13c
12c
14b
15c
14c
16b
17c
16c
18b
19c
18c
20b
21c
20c
22b
23c
22c
24b
25c
24c
26b
27c
26c
28b
29c
28c
30b

10K

10K

OUT

11b
13a
12a
13b
15a
14a
15b
17a
16a
17b
19a
18a
19b
21a
20a
21b
23a
22a
23b
25a
24a
25b
27a
26a
27b
29a
28a
29b
31a
30a

OUT

34 2b

V

EXT

GND

22a

5V

Digital
Input Channel

GND

22a

IN

1

1a

10

10a

11
11a

32
32a

33

1b
42

10b
63
31b

64

32b

73

9c

94
30c

95
31c

96

32c

Digital
Output Schematic Connector
Channel Designator Designator

31 4 4a
32 6 6a
33 8 8a
34 36 4b
35 38 6b
36 40 8b
37 66 2c
38 68 4c
39 70 6c
40 72 8c

Schematic Connector
Designator Designator

133a
255a
377a
4353b
5375b
6397b
7651c
8673c
9695c
10 71 7c

Pins of the Model 7037 mass
termination connector can be identified
in one of three ways:

• Relay switch or digital I/O channels.

• Connector designation, consisting
of rows a-c and columns 1-32.

• Schematic and component layout
designation (1-96).

41
9b

Shield

9

Connection

9a

Figure 4-7

Multi-pin connector card terminal identification

4-6

Table 4-2

Multi-pin connector card terminal designation cross-reference

Card Connections and Installation

Switch
terminal

Chan 1 IN

Chan 2 IN

Chan 3 IN

Chan 4 IN

Chan 5 IN

Chan 6 IN

Chan 7 IN

Chan 8 IN

Chan 9 IN

Chan 10 IN

Chan 11 IN

Chan 12 IN

Chan 13 IN

Chan 14 IN

Chan 15 IN

Chan 16 IN

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

Conn.
desig.
1a-32c

11c

11b
10c

13a
12b

12a
13c

13b
12c

15a
14b

14a
15c

15b
14c

17a

16b

16a
17c

17b
16c

19a
18b

18a
19c

19b
18c

21a
20b

20a
21c

21b

Schem.
desig.
1-96

75
43

74
13

44
12

77
45

76
15

46
14

79
47

78
17

48
16

81
49

80
19

50
18

83
51

82
21

52
20

85
53

Switch
terminal

Chan 17 IN

Chan 18 IN

Chan 19 IN

Chan 20 IN

Chan 21 IN

Chan 22 IN

Chan 23 IN

Chan 24 IN

Chan 25 IN

Chan 26 IN

Chan 27 IN

Chan 28 IN

Chan 29 IN

Chan 30 IN

DIG OUT 31
DIG OUT 32

DIG OUT 33
DIG OUT 34

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

Conn.
desig.
1a-32c

20c
23a

22b
22a

23c
23b

22c
25a

24b
24a

25c
25b

24c
27a

26b
26a

27c
27b

26c
29a

28b
28a
29c

29b
28c

31a
30b

30a

4a
6a

8a

4b

Schem.
desig.
1-96

84
23

54
22

87
55

86
25

56
24

89
57

88
27

58
26

91
59

90
29

60
28

93
61

92
31

62
30

4
6

8

36

Switch
terminal

DIG OUT 35
DIG OUT 36

DIG OUT 37
DIG OUT 38

DIG OUT 39
DIG OUT 40

DIG IN 1
DIG IN 2

DIG IN 3
DIG IN 4

DIG IN 5
DIG IN 6

DIG IN 7
DIG IN 8

DIG IN 9
DIG IN 10

Vext
gnd

Shield
Shield

nc
nc

nc
nc

nc
nc

nc
nc

nc
nc

nc
nc

Conn.
desig.
1a-32c

6b
8b

2c
4c

6c
8c

3a
5a

7a
3b

5b
7b

1c
3c

5c
7c

2b
2a

9a
9b

1a
10a

11a
32a

1b
10b

31b
32b

9c
30c

31c
32c

Schem.
desig.
1-96

38
40

66
68

70
72

3
5

7
35

37
39

65
67

69
71

34
2

9
41

1
10

11
32

33
42

63
64

73
94

95
96

4-7

Card Connections and Installation

Typical connection techniques

All external circuitry, such as instrumentation and DUTs,
that you want to connect to the card must be terminated with
a single 96-pin female DIN connector. The following con­nection techniques provide some guidelines and suggestions
for wiring your circuitry.

WARNING

Before beginning any wiring proce­dures, make sure all power is off and
any stored energy in external circuitry is
discharged.

WARNING

When wiring a connector, do not leave
any exposed wires. No conductive part

A)

Multi-Pin

Connector

Card

of the circuit shall be exposed. Properly
cover the conductive parts, or death by
electric shock may occur.

NOTE

It is recommended that external circuitry
be connected (plugged in) after the Model
7037 is installed in the Model 7001/7002
mainframe and with the mainframe power
off. Installation is covered at the end of
this section.

Round cable assemblies  Figure 4-8 shows typical round

cable connection techniques using accessories available
from Keithley.

Wire instrumentation
and DUT to bulkhead
connector (See Table 4-2
and Figures 4-7 and 4-9
for terminal identification)

B)

C)

Multi-Pin

Connector

Card

Multi-Pin

Connector

Card

Figure 4-8

Typical round cable connection techniques

7011-MTC-2

(Cut in Half)

7011-Kit-R

Connector Kit

7011-MTC-2

cable assembly

Notes: Figure 4-10 provides an exploded view showing
how the connector (with cable) is assembled.

Cable Hitachi p/n N2807-P/D-50TAB is a
50-conductor cable. Two of these cables
can be used to supply 100 conductors.

7011-MTR

bulkhead connector

Wire directly to
instrumentation

and DUT

Wire directly to
instrumentation

and DUT

Cable

4-8

Card Connections and Installation

In Figure 4-8A, connections are accomplished using a Model
7011-MTC-2 cable and a Model 7011-MTR bulkhead con­nector. The two-meter round cable is terminated with a 96­pin female DIN connector at each end. This cable mates
directly to the multi-pin connector card and to the bulkhead
connector. The bulkhead connector has solder cups to allow
direct connection to instrumentation and DUT. Figure 4-9
provides pinout for the bulkhead connector . The vie w sho wn
is from the solder cup end of the connector.

In Figure 4-8B, connections are accomplished using a Model
7011-MTC-2 cable assembly that is cut in half. The 96-pin
female DIN connector on one end of the cable mates directly
to the multi-pin connector card. The unterminated end of the
cable is wired directly to instrumentation and DUT. The
other half of the cable assembly could be used for a second
card.

Note: See Figure 4-7 for terminal identification.

In Figure 4-8C, connections are accomplished using a
custom-built cable assembly that consists of a Model 7011­KIT-R connector and a suitable round cable. Hitachi cable
part number N2807-P/D-50TAB is a 50-conductor round
cable. Two of these cables can be used to provide 100
conductors. The connector has solder cups to accommodate
the individual wires of the unterminated cable. Figure 4-10
provides an exploded view of the connector assembly and
shows how the cable is connected. For further Model
7011-KIT-R assembly information, refer to the packing list
provided with the kit. The connector end of the resultant
cable assembly mates directly to the multi-pin connector
card. The unterminated end of the cable assembly is wired
directly to instrumentation and DUT.

3231302928272625242322212019181716151413121110987654321

c
b
a

View from solder
cup side of
connector

Figure 4-9

Model 7011-MTR connector pinout

Figure 4-10

Model 7011-KIT-R (with cable) assembly

4-9

Card Connections and Installation

Typical relay switch connection scheme

The following paragraphs show how the Model 7037 could
be connected to a system that activates external devices and
circuits.

Figure 4-11 shows how external connections can be made to
the system using the Model 7011-MTC-2 cable that is unter­minated at one end. The unterminated end of the cable can be
hard-wired directly to the external devices and power
supplies.

Indicator

Lamp

Alarm

The other end will mate to the Model 7037 card. Connection
details are provided in the Multi-pin (mass termination) con­nections paragraph.

If adding more Model 7037 cards to a system, simply wire
them in the same manner as the first. Remember that
Model 7037 cards installed in the same mainframe are elec­trically isolated from each other.

7037

7011-MTC-2

Cable (Cut in half)

Relay

12V

30V

5V

5V 12V 30V

7037

IN 1

IN 21

IN 2

IN 22

IN 3

IN 23

Equivalent Circuit

OUT 1

OUT 2

OUT 22

OUT 3

OUT 23

OUT 21

Relay

Alarm

Indicator

Lamp

Figure 4-11

Typical connection scheme for Model 7037

4-10

OUT 39

V

EXT

Motors

7037

OUT 40

GND

12V

+

–

Internal connections:

External voltage source (V

EXT

) selected.

M M

Card Connections and Installation

Typical digital I/O connection schemes

Output connection schemes

The following examples show output connections from the
card to external circuitry and summarize the required inter­nal connections on the card. Each example assumes negativ e
true logic is used. To configure for positive true logic, refer
to the Configuring digital I/O output logic paragraph.

Solenoid control — Figure 4-12 shows a digital output con-

nection scheme to control solenoids. This example assumes
that an external 24V source is being used. A solenoid is ener­gized when the corresponding output channel is turned on
(closed).

7037

V

EXT

OUT 31

Solenoids

+

24V

–

Motor control — Figure 4-13 shows a digital output connec-

tion scheme to control small 12V dc motors. An e xternal 12V
source is used to provide the necessary voltage level. A
motor is turned on when the corresponding output channel is
turned on (closed).

OUT 32

OUT 33

GND

Internal Connections:

External voltage source (V

Figure 4-12

Digital output, solenoid control

) selected.

EXT

Figure 4-13

Digital output, motor control

4-11

Card Connections and Installation

Logic device control — Figure 4-14 shows a digital output

connection scheme to control a logic device. This example
assumes that an internal +5V voltage source is being used.

7037

Micro-

switches

+5V

A

B

C

Logic device

74LS138

DMUX

V

CC

GND

Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7

7037

OUT 31

OUT 32

OUT 33

GND

G2A

Internal connections:
Internal voltage source (+5V) used.

Figure 4-14

Digital output, logic device control

The logic device is a demultiplexer (DMUX). The binary
pattern (value) seen at the input of the DMUX (lines A, B,
and C) determines which DMUX output line (Y0 through
Y7) is selected (pulled low). For example, with channels 1,
2, and 3 off (open), lines A, B and C are high. The binary 7
at the DMUX input (A = 1, B = 1 and C = 1) selects (pulls
low) output Y7. If channel 32 is turned on (closed), line B
goes low. The binary 5 seen at the DMUX input (1, 0, 1)
selects (pulls low) Y5.

Input connection scheme

IN 1

IN 2

IN 3

GND

A. Input resistor is set to pull up.

7037

IN 1

IN 2

IN 3

+V

B. Input resistor is set to pull down.

Figure 4-15

Digital input, monitoring micro-switches

Micro-

switches

Figure 4-15 shows a digital input connection scheme to mon­itor the state of micro-switches. With a switch open and the
input resistor configured for pull up as shown in
Figure 4-15a, the corresponding input channel is pulled high
by the internal input resistor. As a result, the input channel is
high (appears as a bar on the Model 7001 display or a lit LED
on the Model 7002). When a switch is closed, the corre­sponding input channel is pulled low to ground. As a result,
the input channel is low (appears as a single dot on the Model
7001 display or an unlit LED on the Model 7002).

4-12

With a switch open and the input resistance configuration set
to pull down as shown in Figure 4-15b, the corresponding
input channel is pulled low by the internal input resistor. As
a result, the input channel is low . When a switch is closed, the
corresponding input channel is pulled high. As a result, the
input channel is high.

For more information on configuring pull-up resistance,
refer to the Configuring digital I/O input pull-up resistance
paragraph.

Card Connections and Installation

Model 7037 installation and removal

The following paragraphs explain how to install and remove
the Model 7037 card from the Model 7001/7002 mainframe.

WARNING

Installation or removal of the Model
7037 is to be performed by qualified ser­vice personnel. Failure to recognize and
observe standard safety precautions
could result in personal injury or death.

CAUTION

To prevent contamination to the Model
7037 card that could degrade perfor­mance, only handle the card by the
edges and shields.

Card installation

Perform the following steps to install the Model 7037 card in
the Model 7001/7002 mainframe:

1. Mate the connector card to the relay card if they are sep­arated. Install the supplied 4-40 screw at the end of the
card to secure the assembly. Make sure to handle the
cards by the edges and shields to prevent contamination.

2. Facing the rear panel of the mainframe, select the slot
(CARD 1 or CARD 2) that you want to install the
Model 7037 card in.

3. Referring to Figure 4-16, feed the Model 7037 card into
the desired slot so the edges of the relay card ride in the
rails.

4. With the ejector arms in the unlocked position, push the
Model 7037 card all the way into the mainframe until
the arms engage into the ejector cups. Then push both
arms inward to lock the card into the mainframe.

WARNING

To avoid electric shock that could result
in injury or death, make sure to properly
install and tighten the safety ground
screw shown in Figure 4-16.

5. Install the screw shown in Figure 4-16.

WARNING

Turn off power from all instrumentation
(including the Model 7001/7002 main­frame) and disconnect their line cords.
Make sure all power is removed and
stored energy in external circuitry is dis­charged.

Screw

Unlock card

Ejector
Arms (2)

Card removal

To remove the Model 7037 card, first unloosen the safety
ground screw, unlock the card by pulling the latches out­ward, and then pull the card out of the mainframe. Remem­ber to handle the card by the edges and shields to avoid
contamination that could degrade performance.

Screw

Lock card

Figure 4-16

Model 7037 card installation in Model 7001

4-13

Card Connections and Installation

4-14

5

Operation

Introduction

The information in this section is formatted as follows:

• Power limits — Summarizes the maximum power lim­its of the Model 7037 card assembly.

• Mainframe control of the card — Summarizes pro­gramming steps to control the card from the Model
7001/7002 Switch System mainframe.

• Measurement considerations — Reviews a number of
considerations when using the Model 7037 to make
measurements.

Power limits

CAUTION

To prevent damage to the card, do not
exceed the maximum signal level speci­fications of the card. For reactive loads,
be sure to use voltage clamping and cur­rent limiting as explained in the Reac­tive loads paragraph.

Digital I/O maximum signal levels

Output channels

Maximum user-supplied pull-up voltage: 42V
Maximum sink current:

Per channel: 250mA
Per card: 1A

Input channels

Maximum voltage level: 42V peak

Relay switch maximum signal levels

T o prev ent overheating or damage to the relays, ne ver exceed
the following maximum signal levels: 110V DC, 110V rms,
155V peak between any two inputs or chassis, 1A switched,
30VA (resistive load).

Reactive loads

Operation is specified for resistive loads. Reactive loads
require voltage clamping (for inductive loads) and current
surge limiting (for capacitive loads) to pre vent damage to the
relays and to external circuitry.

5-1

Operation

Inductive loads  Inductive reaction voltage must be lim-

ited to less than 110V in DC circuits or 110V rms, 155V peak
in AC circuits. Also consider the load when determining the
voltage limit. Clamping circuits that can be used are shown
in Figure 5-1.

Capacitive loads  The initial surge current from a capac-

itive reactiv e load must be limited. Figure 5-2 shows circuits
that can be used to limit current surges. To protect the relay,
limit current to 1A. Also consider the load when determining
the current surge limit.

7037

OUT 1

OUT 2

7037

B. Diode Clamped (DC Voltages)

OUT 1

OUT 2

7037

OUT 1

OUT 2

C. Zener Clamped (AC Voltages)

Diode

Zener
Diode

7037

OUT 1

OUT 2

R

Load

+

D

C

R

Zener
Diode

Diode

Load

Load

Load

IN 1

IN 2

IN 1

1A

FUSE

IN 2

A. Resistor Clamped (AC or DC Voltages)

IN 1

1A

FUSE

IN 2

1A

FUSE

IN 1

1A

FUSE

IN 2

D. Resistor-Capacitor Clamped (AC Voltages)

IN 1

IN 2

IN 1

IN 2

1A

FUSE

1A

FUSE

High resistance when cold.

*

Low resistance when hot.
Fast thermal recovery.

7037

OUT 1

OUT 2

OUT 1

OUT 2

V

Thermistor*

V

A. Resistor Limited R = I Limit

7037

B. Thermistor Limited Rs = I Limit

(Rs)

R

Load

Load

Figure 5-2

Limiting capacitive reaction current

Mainframe control of the card

The following information pertains to the Model 7037 card.
It assumes you are familiar with the operation of the Model
7001/7002 mainframe.

If you are not familiar with the operation of the mainframe,
it is recommended that you proceed to Getting Started (Sec­tion 3) in the Model 7001 or Model 7002 Instruction Manual
after reading the following information.

Figure 5-1

Limiting inductive reaction voltage

5-2

CARD 1 CARD 2

1 234567891012345678910

= Open Channel
= Closed Channel

Figure 5-3

Model 7001 channel status display

Operation

7001 Display

7002 LED Display

Channel assignments

The Model 7001 has a channel status display (Figure 5-3)
that provides the real-time state of each available channel.
The left portion of the display is for slot 1 (card 1), and the
right portion is for slot 2 (card 2). With two Model 7037
cards installed in the mainframe, the 40 channels of each
card will be displayed as shown in Figure 5-3. For the Model
7002, channel status LED grids are used for the ten slots. The
LED grid for slot 1 is shown in Figure 5-4.

Organization of the channel status display for each slot is
shown in Figure 5-5. The card contains 40 channels and
is made up of 30 independent channels of one-pole switching
and ten digital output channels.

1 2 3 4 5 6 7 8 9

11

12 13 14 15 16

COLUMN

SLOT 1

ROW

1234 6785910

1
2
3
4

= Open channel
= Closed channel

Figure 5-4

Model 7002 channel status display (slot 1)

17 18 19 20

10

21 22 23 24 25 26

Digital

Output

Channels

Figure 5-5

Channel display organization

31 32 33 34 35 36

27

28 29 30

37 38

39 40

5-3

Operation

All digital input and output channels are isolated from the
backplane of the mainframe. W ith the mainframe in the nor­mal display state, the status (on or off) of the output and relay
channels is displayed. When the mainframe is in the read
input channels mode, the status (on or off) of the input chan­nels is displayed.

The hardware for the digital output channels is user config­urable for negative or positive true logic. That is, depending
on the user configuration, the output can go high or be pulled
low when the channel is turned on (closed) or off (open). To
configure output logic, refer to Section 4.

Input channels use positive true logic but can be configured
to pull up or pull down. Thus, a channel can be pulled high
or pulled low when the input is open depending on the
jumper configuration. Input channels will be displayed as
high (on) when the input has a high logic level applied. Con­versely , an input channel will be displayed as lo w (of f) when
a low logic level is applied.

12345678910

1!1 1!2 1!3 1!4 1!5 1!6 1!7 1!8 1!9 1!10

To control the card from the mainframe, each relay and
digital output must have a unique channel assignment.
The channel assignments for the card are provided in
Figure 5-6. Each channel assignment is made up of the slot
designator (1 or 2) and the relay or digital output channel.
For the Model 7002, the slot designator can be from 1 to 10
since there are ten slots. To be consistent with Model 7001/
7002 operation, the slot designator and channel are separated
by exclamation points (!). Some examples of channel
assignments are as follows:

CHANNEL 1!1 = Slot 1, Channel 1
CHANNEL 1!40 = Slot 1, Channel 40 (Output 40 of

Digital I/O)
CHANNEL 2!2 = Slot 2, Channel 2
CHANNEL 2!34 = Slot 2, Channel 34 (Output 34 of

Digital I/O)

These channels are displayed and controlled from the normal
display state of the mainframe. If currently in the menu
structure, return to the normal display state by pressing
EXIT.

1!11 1!12 1!13 1!14 1!15 1!16 1!17 1!18 1!19 1!20

1!21 1!22 1!23 1!24 1!25 1!26 1!27 1!28 1!29 1!30

A. Slot 1

(Card 1)

B. Slot 2

(Card 2)

1!31 1!32 1!33 1!34 1!35 1!36 1!37 1!38 1!39 1!40

12345678910

2!1 2!2 2!3 2!4 2!5 2!6 2!7 2!8 2!9 2!10

2!11 2!12 2!13 2!14 2!15 2!16 2!17 2!18 2!19 2!20

2!21 2!22 2!23 2!24 2!25 2!26 2!27 2!28 2!29 2!30

2!31 2!32 2!33 2!34 2!35 2!36 2!37 2!38 2!39 2!40

Examples: 1!18 = Slot 1, Channel 18

2!36 = Slot 2, Channel 36 (Output 36, Digital I/O)

Figure 5-6

Model 7037 programming channel assignments

5-4

Operation

Closing and opening channels

NOTE

This procedure applies to relay channels
(channels 1!1 through 1!30) and digital
I/O output channels (1!31 through 1!40).
Digital input channels are read only.

A channel is closed (turned on) from the front panel by sim­ply keying in the channel assignment and pressing CLOSE.
For example, to close channel 18 of a card installed in slot 2,
key in the following channel list and press CLOSE:

SELECT CHANNELS 2!18

The above closed channel can be opened (turned off) by
pressing OPEN or OPEN ALL. The OPEN key opens only
the channels specified in the channel list, and OPEN ALL
opens all channels.

NOTE

For the Model 7002, you can use the light
pen to open and close channels.

Pressing CLOSE will turn on channel 2!1 and the channels
that make up channel pattern M1. Refer to the instruction
manual for the mainframe and for information on defining
channel patterns.

Scanning channels

Channels are scanned by creating a scan list and configuring
the Model 7001/7002 to perform a scan. The scan list is cre­ated in the same manner as a channel list. (See the previous
Closing and opening channels paragraph.) However , the scan
list is specified from the SCAN CHANNELS display mode.
(The SCAN LIST key toggles between the channel list and
scan list.) The following shows an example of a scan list:

SCAN CHANNELS 2!1, 2!3, 2!1-2!5

When a scan is performed, the channels specified in the scan
list will be scanned in the order that they are presented in the
scan list.

Channel patterns can also be used in a scan list. This allows
you to control specific bit patterns for logic circuits.
Example:

The following display is an example of a channel list that
consists of several channels:

SELECT CHANNELS 2!1, 2!3, 2!22­2!25

Notice that channel entries are separated by commas (,). A
comma is inserted by pressing ENTER or the right cursor
key (

©

). The channel range is specified by using the hyphen
(-) key to separate the range limits. Pressing CLOSE will
close all the channels specified in the channel list. Pressing
OPEN (or OPEN ALL) will open the channels.

Channel patterns can also be used in a channel list. This
allows you to control specific bit patterns for logic circuits.
Example:

SELECT CHANNELS 2!1, M1

SCAN CHANNELS M1, M2, M3, M4

When M1 is scanned, the channels that make up channel pat­tern M1 will turn on. When M2 is scanned, the M1 channels
will turn off and the channels that make up M2 will turn on.
M3 and M4 are scanned in a similar manner. Refer to the
instruction manual for the mainframe for information on
defining channel patterns.

A manual scan can be performed by using the RESET
default conditions of the Model 7001/7002. RESET is
selected from the SAVESETUP menu of the main MENU.
When RESET is performed, the mainframe is configured for
an infinite number of manual scans. The first press of STEP
takes the mainframe out of the idle state. The next press of
STEP will close the first channel specified in the scan list.
Each subsequent press of STEP will select the next channel
in the scan list.

5-5

Operation

Reading input channels

Input channels are read from the READ-I/O-CARD option
of the CARD CONFIG MENU of the mainframe. This menu
is accessed by pressing the CARD key. In this “read input
channels” display mode, the mainframe displays the real­time state of each input channel.

Input channels use positive true logic but can be configured
to pull up or pull down. Open inputs will read high (on) if
inputs are configured for pull up. Conversely, open inputs
will read low (off) when configured for pull do wn. To config­ure pull-up resistance, refer to Section 4.

Perform the following steps to configure the mainframe to
display the digital input channels.

1. Press the CARD CONFIGURATION k e y to display the
CARD CONFIG MENU.

2. Use the
O-CARD and press ENTER.

Model 7001 mainframe — The real-time state (on or
off) of each input channel is provided on the first row of
the display. Only digital I/O input channels are dis­played.

Model 7002 mainframe — The real-time state (on or
off) of each input channel is provided on the first row of
the appropriate LED display grid. Use the TYPE option
of the CARD CONFIG MENU if you do not know
which slot the card is installed in.

3. Use the EXIT key to exit from the “read input channels”
display mode.

§

and

©

keys to place the cursor on READ-I/

NOTE

With input channels displayed, you can
turn off (open) all other channels by press­ing OPEN ALL.

Closing and opening channels

The following SCPI commands are used to open and close
relay and digital I/O output channels:

:CLOSe <list>
:OPEN <list>|ALL

The following program statement turns on channels 1!1, 1!4
through 1!6, and the channels that make up channel pattern
M1.

PRINT #1, "output 07; clos (@ 1!1, 1!4:1!6, M1)"

Notice that the colon (:) is used to separate the range limits.

Either of the following statements turns off channels 1!1, 1!4
through 1!6, and the channels of M1:

PRINT #1, "output 07; open (@ 1!1, 1!4:1!6, M1)"
PRINT #1, "output 07; open all"

Closes specified channels.
Opens specified (or all) channels.

Scanning output channels

There are many commands associated with scanning. How­ever, it is possible to configure a scan using as little as four
commands. These commands are listed as follows:

*RST
:TRIGger:COUNt:AUTo ON
:ROUTe:SCAN <list>
:INIT

The first command resets the mainframe to a default scan
configuration. The second command automatically sets the
channel count to the number of channels in the scan list, the
third command defines the scan list, and the fourth command
takes the Model 7001/7002 out of the idle state.

IEEE-488 bus operation

Bus operation is demonstrated using Microsoft QuickBASIC

4.5, the Keithley KPC-488.2 (or Capital Equipment Corpo­ration) IEEE interface and the HP-style Universal Language
Driver (CECHP). Refer to “QuickB ASIC 4.5 Programming”
in the mainframe manual for details on installing the Univer­sal Language Driver, opening driver files, and setting the
input terminal. Program statements assume that the primary
address of the mainframe is 07.

5-6

The following program fragment will perform a single scan
of channels 1 through 4 of slot 1 and the channels that make
up channel pattern M1:

PRINT #1, "output 07; *rst"
PRINT #1, "output 07; trig:coun:auto on"
PRINT #1, "output 07; scan (@ 1!1:1!4, M1)"
PRINT #1, "output 07; init"

Operation

The first statement selects the *RST default configuration for
the scan. The second statement sets channel count to the
scan-list-length (5). The third statement defines the scan list,
and the last statement takes the mainframe out of the idle
state. The scan is configured to start as soon as the :INIT
command is executed.

When the above program fragment is run, the scan will be
completed in approximately 240msec (3msec delay for
channel closures and 3msec delay for each open), which is
too fast to view from the front panel. An additional relay
delay can be added to the program to slow down the scan for
viewing. The program is modified by adding a statement to
slow down the scan. Also, a statement is added to the begin­ning of the program to ensure that all channels are open
before the scan is started. The two additional statements are
indicated in bold typeface.

PRINT #1, "output 07; open all"

PRINT #1, "output 07; *rst"
PRINT #1, "output 07; trig:coun:auto on"

PRINT #1, "output 07; trig:del 0.5"

PRINT #1, "output 07; scan (@ 1!1:1!4, M1)"
PRINT #1, "output 07; init"

The first statement opens all channels, and the fourth state­ment sets a 1/2 second delay after each channel closes.

Reading digital I/O input channels

:SENSe10:DATA? <list>
:SENSe11:DATA? <list>

Read input channels; slot 9
Read input channels; slot 10

The conventional form for the <list> parameter includes the
slot and input channel number. However, for these com­mands you do not need to include the slot number. F or exam­ple, you can send either of the following two commands to
read input channel 2 in slot 6:

:SENSe7:DATA? (@6!2)

or

:SENSe7:DATA? (@2)

After the mainframe is addressed to talk, the response mes­sage will indicate the state of each listed input channel. A
returned “0” indicates that the channel is off (open), and a
returned “1” indicates that the channel is on (closed).

The following program fragment reads channel 3 of a digital
I/O card installed in slot 1:

PRINT #1, "output 07; sens2:data? (@3)"
PRINT #1, "enter 07"
LINE INPUT #2, A$
PRINT A$

The first statement reads input channel 3 (slot 1). The second
statement addresses the mainframe to talk (sends response
message to computer). The third statement reads the
response message, and the last statement displays the mes­sage (0 or 1) on the computer CRT.

The following SCPI commands are used to read the status of
digital I/O input channels:

:SENSe2:DATA? <list>
:SENSe3:DATA? <list>
:SENSe4:DATA? <list>
:SENSe5:DATA? <list>
:SENSe6:DATA? <list>
:SENSe7:DATA? <list>
:SENSe8:DATA? <list>
:SENSe9:DATA? <list>

Read input channels; slot 1
Read input channels; slot 2
Read input channels; slot 3
Read input channels; slot 4
Read input channels; slot 5
Read input channels; slot 6
Read input channels; slot 7
Read input channels; slot 8

The above program fragment is modified to read all ten dig­ital I/O input channels in slot 1 as follows. The modified
statement is shown in bold typeface.

PRINT #1, "output 07; sens2:data? (@1:10)"

PRINT #1, "enter 07"
LINE INPUT #2, A$
PRINT A$

The response message will include a “0” (off) or “1” (on) for

each of the ten input channels (i.e. “0, 0, 0, 1, 0..... 0, 1”).

5-7

Operation

Measurement considerations

Many measurements made with the Model 7037 are subject
to various effects that can seriously af fect low-le vel measure­ment accuracy. The following paragraphs discuss these
effects and ways to minimize them.

Path isolation

The path isolation is simply the equivalent impedance
between any two test paths in a measurement system. Ideally ,
the path isolation should be infinite, but the actual resistance
and distributed capacitance of cables and connectors results
in less than infinite path isolation values for these devices.

Path isolation resistance forms a signal path that is in parallel
with the equivalent resistance of the DUT, as shown in Fig­ure 5-7. For low-to-medium device resistance values, path
isolation resistance is seldom a consideration; however, it
can seriously degrade measurement accuracy when testing
high-impedance devices. The voltage measured across such
a device, for example, can be substantially attenuated by the
voltage divider action of the device source resistance and
path isolation resistance, as shown in Figure 5-8. Also, leak­age currents can be generated through these resistances by
voltage sources in the system.

R

DUT

E

DUT

E

=

E

OUT

R

DUT

DUT

R

PATH

R

PATH

+

R

PATH

Figure 5-8

Voltage attenuation by path isolation resistance

Any differential isolation capacitance affects DC measure­ment settling time as well as AC measurement accuracy.
Thus, it is often important that such capacitance be kept as
low as possible. Although the distributed capacitance of the
card is generally fixed by design, there is one area where you
do have control over the capacitance in your system: the con­necting cables. To minimize capacitance, keep all cables as
short as possible.

R

DUT

E

DUT

DUT

R

= Source Resistance of DUT

DUT

E

= Source EMF of DUT

DUT

R

= Path Isolation Resistance

PATH

R

= Input Resistance of Measuring Instrument

IN

Figure 5-7

Path isolation resistance

R

PATH

7037

Card

R

IN

Measure

Instrument

V

Magnetic fields

When a conductor cuts through magnetic lines of force, a
very small current is generated. This phenomenon will fre­quently cause unwanted signals to occur in the test leads of a
relay switching system. If the conductorhas sufficient length,
even weak magnetic fields like those of the earth can create
sufficient signals to affect low-level measurements.

Two ways to reduce these effects are: (1) reduce the lengths
of the test leads, and (2) minimize the exposed circuit area.
In extreme cases, magnetic shielding may be required. Spe­cial metal with high permeability at low flux densities (such
as mu metal) is effective at reducing these effects.

Even when the conductor is stationary , magnetically induced
signals may still be a problem. Fields can be produced by
various signals such as the AC power line voltage. Large
inductors such as power transformers can generate substan­tial magnetic fields, so care must be taken to keep the switch­ing and measuring circuits a good distance away from these
potential noise sources.

5-8

Instrument 1 Instrument 2 Instrument 3

Power Line Ground

Signal Leads

Ground Loop

Current

Instrument 1 Instrument 2 Instrument 3

Power Line Ground

Operation

At high current levels, even a single conductor can generate
significant fields. These effects can be minimized by using
twisted pairs, which will cancel out most of the resulting
fields.

Radio frequency interference

Radio Frequency Interference (RFI) is a general term used to
describe electromagnetic interference over a wide range of
frequencies across the spectrum. Such RFI can be particu­larly troublesome at low signal levels, but it can also affect
measurements at high levels if the problem is of sufficient
severity.

RFI can be caused by steady-state sources such as radio or
TV signals or some types of electronic equipment (micropro­cessors, high speed digital circuits, etc.), or it can result from
impulse sources, as in the case of arcing in high-voltage envi­ronments. In either case, the effect on the measurement can
be considerable if enough of the unwanted signal is present.

RFI can be minimized in several ways. The most obvious
method is to keep the equipment and signal leads as far away
from the RFI source as possible. Shielding the Model 7037
relay-digital I/O card, signal leads, sources, and measuring
instruments will often reduce RFI to an acceptable level. In
extreme cases, a specially constructed screen room may be
required to sufficiently attenuate the troublesome signal.

shown in Figure 5-9, the resulting ground loop causes cur­rent to flow through the instrument LO signal leads and then
back through power line ground. This circulating current
develops a small, but undesirable, voltage between the LO
terminals of the two instruments. This voltage will be added
to the source voltage, affecting the accuracy of the measure­ment.

Figure 5-10 shows how to connect several instruments to­gether to eliminate this type of ground loop problem. Here,
only one instrument is connected to power line ground.

Figure 5-9

Power line ground loops

Many instruments incorporate internal filtering that may
help to reduce RFI effects in some situations. In some cases,
additional external filtering may also be required. Keep in
mind, however , that filtering may ha ve detrimental ef fects on
the desired signal.

Ground loops

When two or more instruments are connected together, care
must be taken to avoid unwanted signals caused by ground
loops. Ground loops usually occur when sensitive instru­mentation is connected to other instrumentation with more
than one signal return path such as power line ground. As

Figure 5-10

Eliminating ground loops

5-9

Operation

Ground loops are not normally a problem with instruments
having isolated LO terminals. However, all instruments in
the test setup may not be designed in this manner. When in
doubt, consult the manual for all instrumentation in the test
setup.

Keeping connectors clean

As is the case with any high-resistance device, the integrity
of connectors can be damaged if they are not handled prop­erly. If connector insulation becomes contaminated, the insu­lation resistance will be substantially reduced, affecting
high-impedance measurement paths.

Oils and salts from the skin can contaminate connector insu­lators, reducing their resistance. Also, contaminants present
in the air can be deposited on the insulator surface. T o a void

these problems, never touch the connector insulating mate­rial. In addition, the Model 7037 card should be used only in
clean, dry environments to avoid contamination.

If the connector insulators should become contaminated,
either by inadvertent touching or from airborne deposits,
they can be cleaned with a cotton swab dipped in clean meth­anol. After thorough cleaning, the y should be allowed to dry
for several hours in a low-humidity environment before use,
or they can be dried more quickly using dry nitrogen.

AC frequency response

The AC frequency response of the Model 7037 is important
in test systems that switch A C signals. Refer to the specifica­tions at the front of this manual.

5-10

•

•

•

•

•

•

6

Service Information

WARNING

The information in this section is
intended only for qualified service per­sonnel. Some of the procedures may
expose you to hazardous voltages that
could result in personal injury or death.
Do not attempt to perform these proce­dures unless you are qualified to do so.

Introduction

This section contains information necessary to service the
Model 7037 relay-digital I/O card and is arranged as follows:

Handling and cleaning precautions  Discusses han-

dling procedures and cleaning methods for the card.

Performance verification  Covers the procedures

necessary to determine if the card is operating properly.

Channel functionality test  Provides a test proce-

dure to determine if a digital I/O input or output channel
is functioning properly.

Special handling of static-sensitive devices  Re-

views precautions necessary when handling static-sen­sitive devices.

Principles of operation  Briefly discusses circuit op-

eration.

Troubleshooting  Presents some troubleshooting

tips for the card.

Handling and cleaning precautions

Because of the high impedance circuits on the Model 7037,
care should be taken when handling or servicing the card to
prevent possible contamination that could degrade perfor­mance. The following precautions should be taken when
handling the card.

Do not store or operate the card in an environment where
dust could settle on the circuit board. Use dry nitrogen gas to
clean dust off the card if necessary.

Handle the card only by the side edges and shields. Do not
touch any board surfaces, components, or connectors. Do not
touch areas adjacent to electrical contacts. When servicing
the card, wear clean cotton gloves.

If making solder repairs on the circuit board, use an
OA-based (organic activated) flux. Remove the flux from
these areas when the repair is complete. Use pure water
along with plenty of clean cotton swabs to remove the flux.
Take care not to spread the flux to other areas of the circuit
board. Once the flux has been removed, swab only the
repaired area with methanol, then blowdry the board with
dry nitrogen gas.

After cleaning, the card should be placed in a 50 ° C low
humidity environment for several hours.

6-1

Service Information





Performance verification

The following paragraphs discuss performance verification
procedures for the Model 7037, including channel resis­tance, offset current, contact potential, and isolation.

CAUTION

Contamination will degrade the perfor­mance of the card. To avoid contamina­tion, always grasp the card by the side
edges and shields. Do not touch the con­nectors and do not touch the board sur­faces or components. On plugs and
receptacles, do not touch areas adjacent
to the electrical contacts.

NOTE

Failure of any performance verification
test may indicate that the switch card is
contaminated. See the Handling and
cleaning precautions paragraph to clean
the card.

Environmental conditions

All verification measurements should be made at an ambient
temperature between 18 ° and 28 ° C, and at a relative humid­ity of less than 70%.

Recommended equipment

Table 6-1 summarizes the equipment necessary for perfor­mance verification, along with an application for each unit.

Card connections

The following information summarizes methods that can be
used to connect test instrumentation to the connector card.
Detailed connection information is provided in Section 4.

Table 6-1

Verification equipment

Description Model Specifications Applications

DMM Keithley Model 2000 100 Ω ; 0.01% Path resistance
Electrometer w/voltage source Keithley Model 6517A 20pA, 200pA; 1%

100V source; 0.15%
Sensitive Digital Voltmeter Keithley Model 182 3mV; 60ppm Contact potential
Triax cable (unterminated) Keithley Model 7025
Low thermal cable

(unterminated)

Keithley Model 1484

Offset current, path isola­tion

Offset current
Contact potential

6-2

Service Information

One method to make instrument connections to the card is to
hard-wire a 96-pin female DIN connector and then mate it to
the connector on the Model 7037. Shorting connections can
also be done at the connector. The connector in the Model
7011-KIT-R connection kit (see Table 4-1) can be used for
this purpose. Pin identification for the multi-pin connector
for the connector card is provided by Figure 4-7 and
Table 4-2.

WARNING

When wiring a connector, do not leave
any exposed wires. No conductive part
of the circuit may be exposed. Properly
cover the conductive parts, or death by
electric shock may occur.

CAUTION

After making solder connections to a
connector, remove solder flux as
explained at the beginning of this sec­tion. Failure to clean the solder connec­tions could result in degraded
performance, preventing the card from
passing verification tests.

Channel resistance tests

Referring to Figure 6-1, perform the following steps to verify
that each contact of every relay is closing properly and that
the resistance is within specification.

1. Turn off the Model 7001/7002 if it is on.

2. Set the Model 2000 to the 100 Ω range and connect four
test leads to the INPUT and SENSE Ω 4 WIRE input.

3. Short the four test leads together and zero the Model

2000. Leave zero enabled for the entire test.

4. Connect INPUT HI and SENSE Ω 4 WIRE HI of the
Model 2000 to the input (IN) terminal of channel 1 as
shown in Figure 6-1.

5. Connect INPUT LO and SENSE Ω 4 WIRE LO to the
output (OUT) terminal of channel 1.

6. With the card installed in slot 1 (CARD 1) of the main­frame, turn on the Model 7001/7002 and program it to
close channel 1!1 (slot 1, channel 1). Verify that the
resistance of this channel is <1.25 Ω .

7. Repeat the basic procedure of steps 1 through 6 to test
the rest of the channels of the Model 7037 card. Remem­ber to close the channel that the Model 2000 is con­nected to.

Before pre-wiring any connector plugs, study the following
test procedures to fully understand the connection
requirements.

HI

LO

POWER

Model 2000

(Measure 4-Wire Ohms)

Path Resistance Test

Figure 6-1

Channel resistance testing

Each Channel:

Sense Ω 4 Wire HI

Input HI

Input LO

Sense Ω 4 Wire LO

7037

IN

OUT

6-3

Service Information

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

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

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

Offset current tests

These tests check leakage current from input (IN) and output
(OUT) to chassis (common mode) for each channel. In gen­eral, these tests are performed by simply measuring the leak­age current with an electrometer. In the follo wing procedure,
the Model 6517A is used to measure leakage current.

Referring to Figure 6-2, perform the following procedure to
check offset current:

1. Turn off the Model 7001/7002 if it is on.

2. Connect the Model 6517A electrometer to channel 1 as
shown in Figure 6-2. Note that electrometer HI is con­nected to input (IN) of channel 1. Electrometer LO is
connected to chassis ground, which is accessible at the
rear panel of the mainframe.

Model 7025
Unterminated
Triax Cable

90-110V

!

180-220V

105-125V

210-250V

115V

!

3. Install the Model 7037 card in slot 1 (CARD 1) of the
Model 7001/7002 if it is not already installed.

4. On the Model 6517A, select the 200pA range and
enable zero check and zero correct the instrument.
Leave zero correct enabled for the entire procedure.

5. Turn on the Model 7001/7002.

6. Program the Model 7001/7002 to close channel 1!1.

7. On the Model 6517A, disable zero check and verify that
it is <100pA. This measurement is the common-mode
leakage current of the channel.

8. On the Model 6517A, enable zero check.

9. Repeat the basic procedure in steps 1 through 8 to check
the other channels. Remember to close the channel that
the electrometer is connected to.

HI

Each Channel:

IN

LO

7037

Figure 6-2

Offset current testing

Model 6517A

(Measure Current)

Chassis ground can be
accessed at the rear
panel of the 7001/7002

OUT

6-4

Service Information

Contact potential tests

These tests check the EMF generated by each relay contact
for each channel. The tests simply consist of using a sensitive
DVM (Model 182) to measure the contact potential.

Perform the following procedure to check contact potential
of each path:

1. Turn off the Model 7001/7002 if it is on.

2. Set the Model 182 to the 3mV range, short the input
leads, and press REL READING to null out internal off­set. Leave REL enabled for the entire procedure.

3. Connect the Model 182 to channel 1 as shown in
Figure 6-3.

4. Install the Model 7037 card in slot 1 (CARD 1) of the
Model 7001/7002 if it is not already installed.

5. Turn on the Model 7001/7002.

6. Program the Model 7001/7002 to close channel 1!1.

Model 1484

Low Thermal Cable

(Unterminated)

7. Verify that the reading on the Model 182 is <4 µ V. This
measurement is the contact potential of the channel.

8. Repeat the basic procedure in steps 1 through 7 to test
the rest of the channels of the Model 7037.

Channel to channel isolation tests

These tests check the leakage resistance (isolation) between
adjacent channels. A channel is the circuit from the input
(IN) to the output (OUT) that results by closing the channel
relay.

In general, the test is performed by applying a voltage
(+100V) across two adjacent channels and then measuring
the leakage current across the channels. The isolation resis­tance is then calculated as R = V/I. In the following proce­dure, the Model 6517A functions as both a voltage source
and an ammeter. In the R function, the Model 6517A inter­nally calculates the resistance from the known voltage and
current levels and displays the resistance value.

KEITHLEY

182 SENSITIVE DIGITAL VOLTMETER

Figure 6-3

Contact potential testing

Model 182

TALK
LSTN

TRG
SRQ
REM

HI

LO

Each channel:

IN

OUT

7037

6-5

Service Information

WARNING:

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

WARNING:

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

CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

Ground Link
Removed

Banana to
Banana Cable

Model 7025

Unterminated
Triax Cable

!

Figure 6-4

Channel to channel testing

90-110V
105-125V

!

Model 6517A

Each Adjacent Channel Pair:

180-220V
210-250V

115V

Source V and
Measure V/I

Unterminated
Banana Cables

HI

(Red)

HI

IN

OUT

7037

IN

OUT

Refer to Figure 6-4 and perform the following steps to test
channel to channel isolation:

1. Turn off the Model 7001/7002 if it is on.

2. Connect the Model 6517A to channels 1 and 2 as shown
in Figure 6-4. Make sure the voltage source is off.

3. Install the Model 7037 in slot 1 (CARD 1) of the
Model 7001/7002 if it is not already installed.

WARNING

The following steps use hazardous volt­age (100V). Be sure to remove power
from the circuit before making connec­tion changes.

4. On the Model 6517A, select the ohms function and
choose the 2G Ω range.

5. On the Model 6517A, set the voltage source for +100V.
Make sure the voltage source is off.

6. Place the Model 6517A in the R measurement function.

7. Turn on the Model 7001/7002, and program it to close
channels 1!1 and 1!2 (channels 1 and 2).

8. On the Model 6517A, turn on the output of the voltage
source.

9. After allowing the reading on the Model 6517A to settle,
verify that it is >1G Ω . This measurement is the channel
to channel leakage resistance (isolation) between chan­nels 1 and 2.

10. Turn off the Model 6517A voltage source.

11. Turn off the Model 7001/7002.

12. Disconnect the Model 6517A from channels 1 and 2,
and, in a similar manner, reconnect it to channels 2 and
3 (electrometer high to channel 2, and voltage source
high to channel 3).

13. Install the card in slot 1 (CARD 1) of the
Model 7001/7002 if it is not already installed.

14. Turn on the Model 7001/7002 and program it to close
channels 1!2 and 1!3.

15. On the Model 6517A, turn on the voltage source.

16. After allowing the reading on the Model 6517A to settle,
verify that it is >1G Ω . This is the isolation between
channels 2 and 3.

17. Using Table 6-2 as a guide, repeat the basic procedure of
steps 11 through 16 for the rest of the path pairs (starting
with test 3).

6-6

Table 6-2

Channel to channel isolation tests

Test no. Isolation test Test equipment location Channels closed

1 Channel 1 to Channel 2 Channels 1 and 2 1!1 and 1!2
2 Channel 2 to Channel 3 Channels 2 and 3 1!2 and 1!3
3 Channel 3 to Channel 4 Channels 3 and 4 1!3 and 1!4
4 Channel 4 to Channel 5 Channels 4 and 5 1!4 and 1!5
5 Channel 5 to Channel 6 Channels 5 and 6 1!5 and 1!6
6 Channel 6 to Channel 7 Channels 6 and 7 1!6 and 1!7
7 Channel 7 to Channel 8 Channels 7 and 8 1!7 and 1!8
8 Channel 8 to Channel 9 Channels 8 and 9 1!8 and 1!9

9 Channel 9 to Channel 10 Channels 9 and 10 1!9 and 1!10
10 Channel 10 to Channel 11 Channels 10 and 11 1!10 and 1!11
11 Channel 11 to Channel 12 Channels 11 and 12 1!11 and 1!12
12 Channel 12 to Channel 13 Channels 12 and 13 1!12 and 1!13
13 Channel 13 to Channel 14 Channels 13 and 14 1!13 and 1!14
14 Channel 14 to Channel 15 Channels 14 and 15 1!14 and 1!15
15 Channel 15 to Channel 16 Channels 15 and 16 1!15 and 1!16
16 Channel 16 to Channel 17 Channels 16 and 17 1!16 and 1!17
17 Channel 17 to Channel 18 Channels 17 and 18 1!17 and 1!18
18 Channel 18 to Channel 19 Channels 18 and 19 1!18 and 1!19
19 Channel 19 to Channel 20 Channels 19 and 20 1!19 and 1!20
20 Channel 20 to Channel 21 Channels 20 and 21 1!20 and 1!21
21 Channel 21 to Channel 22 Channels 21 and 22 1!21 and 1!22
22 Channel 22 to Channel 23 Channels 22 and 23 1!22 and 1!23
23 Channel 23 to Channel 24 Channels 23 and 24 1!23 and 1!24
24 Channel 24 to Channel 25 Channels 24 and 25 1!24 and 1!25
25 Channel 25 to Channel 26 Channels 25 and 26 1!25 and 1!26
26 Channel 26 to Channel 27 Channels 26 and 27 1!26 and 1!27
27 Channel 27 to Channel 28 Channels 27 and 28 1!27 and 1!28
28 Channel 28 to Channel 29 Channels 28 and 29 1!28 and 1!29
29 Channel 29 to Channel 30 Channels 29 and 30 1!29 and 1!30

Service Information

6-7

Service Information

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

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

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

Ground Link
Removed

Banana to
Banana Cable

Model 7025

Unterminated
Triax Cable

Chassis ground
is accessible at
7001/7002
rear panel

90-110V

!

Model 6517A

180-220V

105-125V

210-250V

115V

!

Source V and
Measure V/I

Unterminated
Banana Cables

Figure 6-5

Common-mode isolation testing

Common-mode isolation tests

These tests check the common-mode isolation (leakage
resistance) between the input (IN) and chassis ground of
every channel.

In general, the test is performed by applying a voltage
(+100V) and then measuring the leakage current. The isola­tion resistance is then calculated as R = V/I. In the follo wing
procedure, the Model 6517A functions as a voltage source
and an ammeter. In the R function, the Model 6517A inter­nally calculates the resistance from the known voltage and
current levels and displays the resistance value.

Refer to Figure 6-5 and perform the following steps to test
common-mode isolation.

1. Turn off the Model 7001/7002 if it is on.

2. Connect the Model 6517A to channel 1 as shown in
Figure 6-5. Make sure the voltage source is off. Note
that the voltage source HI is connected to the input (IN).
Electrometer HI can be connected to chassis ground at
the rear panel of the Model 7001/7002.

3. Install the Model 7037 in slot 1 (CARD 1) of the
Model 7001/7002 if it is not already installed.

HI

(Red)

HI

HI

Each channel:

7037

IN

OUT

WARNING

The following steps use hazardous volt­age (100V). Be sure to remove power
from the circuit before making connec­tion changes.

4. On the Model 6517A, select the ohms function and
choose the 2G Ω range.

5. On the Model 6517A, set the voltage source for +100V.
Make sure the voltage source is still off.

6. Place the Model 6517A in the R measurement function.

7. Turn on the Model 7001/7002 and program the main­frame to close channel 1!1 (slot 1, channel 1).

8. On the Model 6517A, turn on the voltage source.

9. After allowing the reading on the Model 6517A to settle,
verify that it is >1G Ω . This measurement checks the
common-mode isolation of channel 1.

10. Turn off the Model 6517A voltage source.

11. Repeat the basic procedure in steps 1 through 10 to
check differential isolation of the other Model 7037
channels. Remember to close the relay of the channel
being checked.

12. Turn off the Model 6517A voltage source and the
Model 7001/7002.

6-8

Service Information

Channel functionality test

1. As shown in Figure 6-6, connect the suspect input or
output channel to an output or input channel that is
known to be functioning properly. The internal 5V
supply must be used.

2. From the front panel of the mainframe, turn on (close)
the output channel. Verify that the display indicates that
the output channel is on (closed). Keep in mind that the
output can be high (positive) or low (ne gative) when the
channel is turned on, depending on the logic
configuration.

3. Place the mainframe in the “read input channels” dis­play mode. Verify on the display that the input channel
is off (open).

4. On the mainframe, turn off (open) the output channel
and verify on the display that the input channel turns on
(closes).

5. On the mainframe, return the instrument to the normal
display mode and verify on the display that the output
channel is off (open).

Output Channel

OUT

Input Channel

IN

Special handling of static-sensitive devices

CMOS and other high-impedance devices are subject to pos­sible static discharge damage because of the high-impedance
levels involved. The following precautions pertain specifi­cally to static-sensitive devices. However, since many
devices in the Model 7037 are static-sensitive, it is recom­mended that they all be treated as static-sensitive.

1. Such devices should be transported and handled only in
containers specially designed to prevent or dissipate
static buildup. Typically, these devices will be receiv ed
in anti-static containers made of plastic or foam. Keep
these parts in their original containers until ready for
installation.

2. Remove the devices from their protective containers
only at a properly grounded work station. Also, ground
yourself with a suitable wrist strap while working with
these devices.

3. Handle the devices only by the body; do not touch the
pins or terminals.

4. Any printed circuit board into which the device is to be
inserted must first be grounded to the bench or table.

5. Use only anti-static type de-soldering tools and
grounded-tip soldering irons.

GND

Internal connections:

Internal voltage source (+5V) selected.

Figure 6-6

Testing an input or output channel

GND

6-9

Service Information

Principles of operation

The following paragraphs discuss the basic operating princi­ples for the Model 7037 and can be used as an aid in trouble­shooting the card. The schematic drawings of the card are
shown on drawing numbers 7037-106 and 7021-172 located
in Section 7.

OUTCLOCK

Relay

Drivers

U106­U109

Output

Channel

Drivers

U105

and

U106

To Mainframe

To Mainframe

OUTDATA

STROBE

ENABLE

OUTCLOCK

OUTDATA

STROBE

ENABLE

Block diagram

Figure 6-7 shows a simplified block diagram of the
Model 7037. Key elements include the R OM, which contains
card ID and configuration information, relay drivers and
relays, digital I/O output channel drivers, and digital I/O
input channel registers. These various elements are discussed
in the following paragraphs.

Relay

Channels

1-30

Output

Channels

31-40

User

connections

+3.5V (Steady State)
+5.7 (≈ 100 msec during
relay actuation)

User

connections

From

Mainframe

To/From

Mainframe

Figure 6-7

Model 7037 block diagram

IN DATA

INCLOCK

STROBE

ENABLE

IDCLK

ID DATA

Input
Channel
Registers

U101

and

U102

ROM

U110

IN 1
IN 2

IN 10

Relay

Power

Control

Q100, Q101
U114, U115

+6V, +15V

6-10

Service Information

ID data circuits

Upon power-up, card identification information from each
card is read by the mainframe. This ID data includes such
information as card ID, hardware settling time, and relay and
channel configuration information.

ID data is contained within an on-card EEPROM (U110). In
order to read this information, the sequence described below
is performed on power-up.

1. The IDDA TA line (pin 5 of U110) is set from high to low
while the IDCLK line (pin 6 of U110) is held high. This
action initiates a start command to the ROM to transmit
data serially to the mainframe (Figure 6-8).

IDCLK

IDDATA

2. The mainframe sends the ROM address location to be
read over the IDD AT A line. The ROM then transmits an
acknowledge signal back to the mainframe, and it then
transmits data at that location back to the mainframe
(Figure 6-9).

3. The mainframe then transmits an acknowledge signal,
indicating that it requires more data. The ROM will then
sequentially transmit data after each acknowledge sig­nal it receives.

4. Once all data is received, the mainframe sends a stop
command, which is a low-to-high transition of the
IDDATA line with the IDCLK line held high
(Figure 6-8).

Start Bit Stop Bit

Figure 6-8

Start and stop sequences

IDCLK

IDDATA

(Data output

from mainframe
or ROM)

IDDATA

(Data output
from mainframe
or ROM)

Start

Figure 6-9

Transmit and acknowledge sequence

189

Acknowledge

6-11

Service Information

Relay control

Card relays are controlled by serial data transmitted via the
relay OUTDATA line. A total of five bytes for each card are
shifted in serial fashion into latches located in the card relay
driver ICs. The serial data is clock ed in by the OUTCLOCK
line. As data overflows one register, it is fed out the Q’s line
of the register down the chain.

Once all five bytes have shifted into the card, the STROBE
line is set high to latch the relay information into the Q out­puts of the relay drivers, and the appropriate relays are ener­gized (assuming the driver outputs are enabled, as discussed
below). Note that a relay driver output goes low to energize
the corresponding relay.

Relay power control

A relay power control circuit, made up of U114, U115,
Q100, Q101, and associated components, keeps power dissi­pated in relay coils at a minimum, thus reducing possible
problems caused by thermal EMFs.

During steady-state operation, the relay supply voltage, +V,
is regulated to +3.5V to minimize coil power dissipation.
When a relay is first closed, the STROBE pulse applied to
U114 changes the parameters of the relay supply voltage reg­ulator, Q100, allowing the relay supply v oltage, +V, to rise to
+5.7V for about 100msec. This brief voltage rise ensures that
relays close as quickly as possible. After the 100msec period
has elapsed, the relay supply voltage (+V) drops back down
to its nominal steady-state value of +3.5V.

Digital I/O output channel control

Digital output channels are controlled by serial data trans­mitted from the mainframe to the card via the OUTDATA
line. A total of two bytes are shifted in a serial fashion into
latches located in the output channel driver ICs. The serial
data is clocked in by the OUTCLK line. As data overflows
one register, it is fed out the Q’s line of the register down the
chain.

Once all bytes have shifted into the card, the STROBE line
is set high to latch the output channel information into the Q
outputs of the output channel drivers. Note that a channel
driver output can go low or high when it is turned on (closed)
depending on its logic configuration.

Digital I/O input channel control

The mainframe reads digital input channels of the I/O card
from a serial, two-byte data stream (via INDATA line).

Digital inputs are applied in a parallel fashion to the two
input channel registers (U102 contains eight channels and
U101 contains two channels). When the digital inputs are
read, the STROBE line goes high to latch the input channel
information. The INCLOCK line then clocks out the infor­mation as a serial, two-byte data stream (via INDATA line)
to the mainframe. As data empties from the lead register
(U102), it is replaced by data via the Q7 line of the registers
down the chain.

Power-on safeguard

NOTE

The power-on safeguard circuit discussed
below is actually located on the digital
board in the mainframe.

A power-on safeguard circuit, made up of a D-type flip-flop
and associated components, ensures that relays and digital
I/O output channels do not randomly energize on power-up
and power-down. This circuit disables all relays and output
channels (all relays and output channels are open) during
power-up and power-down periods.

The PRESET line on the D-type flip-flop is controlled by the
68302 microprocessor, while the CLK line of the D-type
flip-flop is controlled by a VIA port line on the 68302 proces­sor. The Q output of the flip-flop drives each switch card
relay/output channel driver IC enable pin (U105-U109,
pin 8).

When the 68302 microprocessor is in the reset mode, the
flip-flop PRESET line is held low, and Q out immediately
goes high, disabling all relays and output channels (driver IC
enable pins are high). After the reset condition elapses
( ≈ 200msec), PRESET goes high while Q out stays high.
When the first valid STROBE pulse occurs, a low logic level
is clocked into the D-type flip-flop, setting Q out low and
enabling all relay drivers and output channel driv ers simulta­neously. Note that Q out stays low, (enabling relay drivers
and output channels) until the 68302 processor goes into a
reset condition.

6-12

Service Information

Troubleshooting

Lethal voltages are present within the
Model 7001/7002 mainframe. Some of
the procedures may expose you to haz­ardous voltages. Observe standard
safety precautions for dealing with live
circuits. Failure to do so could result in
personal injury or death.

Observe the following precautions when
troubleshooting or repairing the card.

To avoid contamination, which could
degrade card performance, always han­dle the card only by the handle and side
edges. Do not touch edge connectors,
board surfaces, or components on the
card. Also, do not touch areas adjacent
to electrical contacts on connectors.

Use care when removing relays from the
PC board to avoid pulling traces away
from the circuit board. Before attempt­ing to remove a relay, use an appropri­ate de-soldering tool, such as a solder
sucker, to clear each mounting hole
completely free of solder. Each relay pin
must be free to move in its mounting
hole before removal. Also, make certain
that no burrs are present on the ends of
the relay pins.

WARNING

CAUTION

Troubleshooting equipment

Table 6-3 summarizes recommended equipment for trouble­shooting the Model 7037.

Table 6-3

Recommended troubleshooting equipment

Manufacturer

Description

Multimeter Keithley 2000 Measure DC voltages
Oscilloscope TEK 2243 View logic waveforms

and model Application

Troubleshooting access

In order to gain access to the relay card top surface to mea­sure voltages under actual operation conditions, perform the
following steps:

1. Disconnect the connector card from the relay card.

2. Remove the Model 7001/7002 cover.

3. Install the relay card in the CARD 1 slot location.

4. Turn on Model 7001/7002 power to measure voltages
(see following paragraph).

6-13

Service Information

Troubleshooting procedure

T able 6-4 summarizes relay-digital I/O card troubleshooting.

Table 6-4

Troubleshooting procedure

Step Item/Component Required Condition Comments

1 GND pad All voltages referenced to digital ground

(GND pad).
2 Q100, pin 2 +6VDC Relay voltage.
3 U101, pin 16 +5VDC Logic voltage.
4 R135 +15VDC Relay bias voltage.
5 Q100, pin 3 +3.5VDC* Regulated relay voltage.
6 U110, pin 6 IDCLK pulses During power-up only.
7 U110, pin 5 IDDATA pulses During power-up only.
8 U106, pin 7 STROBE pulse End of relay update sequence.
9 U106, pin 2 CLK pulses During relay update sequence only.

10 U106, pin 3 DATA pulses During relay update sequence only.
11 U105-U109, pins 10-18 Low with relay energized; high

with relay de-energized.

*+3.5VDC present at +V pad under steady-state conditions. This voltage rises to +5.7VDC for about 100msec when relay configuration is changed.

Relay driver outputs.

6-14

7

Replaceable Parts

Introduction

This section contains replacement parts information, sche­matic diagrams, and component layout drawings for the
Model 7037.

Parts lists

Parts lists for the various circuit boards are included in tables
integrated with schematic diagrams and component layout
drawings for the boards. Parts are listed alphabetically in
order of circuit designation.

Ordering information

To place an order, or to obtain information concerning
replacement parts, contact your Keithley representative or
the factory (see inside front cover for addresses). When
ordering parts, be sure to include the following information:

1. Card model number 7037

2. Card serial number

3. Part description

4. Circuit description, if applicable

5. Keithley part number

1. Complete the service form at the back of this manual
and include it with the card.

2. Carefully pack the card in the original packing carton or
the equivalent.

3. Write ATTENTION REPAIR DEPT on the shipping
label.

NOTE

It is not necessary to return the mainframe
with the card.

Component layouts and schematic diagrams

Component layout drawings and schematic diagrams are
included on the following pages after the parts lists:

Table 7-1 — Parts List, Relay Card for 7037.
Table 7-2 — Parts List, Mass Terminated Connector Card

for 7037.

Table 7-3 — Parts List, Model 7011-KIT-R 96-pin Female

DIN Connector Kit.
7037-100 — Component Layout, Relay Card for 7037.
7037-106 — Schematic, Relay Card for 7037.

Factory service

If the card is to be returned to Keithley Instruments for repair ,
perform the following:

7021-170 — Component Layout, Mass Terminated Con-

nector Card for 7037.
7021-176 — Schematic, Mass Terminated Connector Card

for 7037.

7-1

Replaceable Parts

Table 7-1

Relay card for Model 7037 parts list

Circuit
designation Description

2-56X3/16 PHILLIPS PAN HEAD SCREW (BOARD TO SHIELD) 3-56X3/16PPH
2-56X5/16 PHILLIPS PAN HEAD SEMS SCREW (BOARD TO SHIELD) 2-56X5/16PPHSEM
2-56X5/8 PHILLIPS PAN HEAD FASTENER (FOR P2001 TO STAND­OFF AND SHIELD)
4-40X3/16 PHILLIPS PAN HEAD SEMS SCREW (FOR Q100) 4-40X3/16PPHSEM
4-40 PEM NUT FA-131
CONNECTOR, JUMPER CS-476
EJECTOR ARM 7011-301B
IC, SERIAL EPROM, 24C01P IC-737
ROLL PIN (FOR EJECTOR ARMS) DP-6-1
SHIELD 7011-305C

STANDOFF, 2 CLEARANCE ST-204-1
C100­112,114,115,
118,121,122,
125
C116,117,126 CAP, 150PF, 10%, 1000V, CERAMIC C-64-150P
C119,127 CAP, 1µF, 20%, 50V, CERAMIC C-237-1
C120 CAP, 0.001µF, 20%, 500V, CERAMIC C-22-.001
C123,124 CAP, 10µF, -20+100%, 25V, ALUM ELEC C-314-10
CR100-119 DIODE, SILICON, IN4148 (D0-35) RF-28
J100,101 CONN, BERG CS-339
J1002,1003 CONN, 48-PIN, 3-ROW CS-736-2
K100-129 RELAY, ULTRA-SMALL POLARIZED TF2E-5V RL-149
P2001 CONN, 32-PIN, 2-ROW CS-775-1
Q100 TRANS, NPN PWR, TIP31 (T0-220AB) TG-253
Q101 TRANS, N CHAN MOSPOW FET, 2N7000 (T0-92) TG-195
R100-130,132 RES, 10K, 5%, 1/4W, COMPOSITION OR FILM R-76-10K
R131 RES, 1K, 5%, 1/4W, COMPOSITION OR FILM R-76-1K
R133 RES, 220K, 5%, 1/4W, COMPOSITION OR FILM R-76-220K
R134,135 RES, 560, 10%, 1/2W, COMPOSITION R-1-560
R136 RES, 2.49K, 1%, 1/8W, METAL FILM R-88-2.49K
R137 RES, 1.15K, 1%, 1/8W, METAL FILM R-88-1.15K
R138 RES, 1K, 1%, 1/8W, METAL FILM R-88-1K
S110 SOCKET S0-72
ST1 STANDOFF, 4-40X0.812LG ST-137-20
U100,103,104 IC, QUAD 2-INPUT EXCLUSIVE OR 74HCT86 IC-707
U101,102 IC, 8-BIT PARALLEL TO SERIAL, 74HCT165 IC-548
U105-109 IC, 8-BIT, SERIAL-IN LATCH DRIVER, 5841A IC-536
U110 PROGRAM 7037-800A01
U111 IC, HEX INVERTER, 74HCT04 IC-444
U112 IC, QUAD 2 INPUT OR 74HCT32 IC-443
U113 IC, HIGH SPEED BUFFER, 74HC125 IC-451
U114 IC, RETRIG MONO MULTIVIB, 74HC123 IC-492
U115 IC, AJD SHUNT REGULATOR, TL431CLP IC-677
VR100 DIODE, ZENER, 5.1V, IN751 (D0-7) DZ-59

CAP, 0.1µF, 20%, 50V, CERAMIC C-365-.1

Keithley
part no.

F A-245-1

7-2

Table 7-2

Mass terminated connector card for Model 7037 parts list

Replaceable Parts

Circuit
designation Description

2-56X3/16 PHILLIPS PAN HEAD SCREW (FOR SHIELD) 2-56X3/16PPH
2-56X3/8 PHILLIPS PAN HEAD SCREW (FOR BRACKET) 2-56X3/8PPH
2-56X7/16 PHILLIPS PAN HEAD SCREW 2-56X7/16PPH
4-40X1/4 PHILLIPS PAN HEAD SEMS SCREW (CONNECTS RELAY
BOARD TO CONNECTOR BOARD)
BRACKET 7011-307
CONN, JUMPER (FOR J201) CS-476
SHIELD 7011-311A

STANDOFF ST-203-1
C201-203 CAP, 0.1µF, 20%, 50V, CERAMIC C-365-.1
J201 CONN, BERG CS-339
J202,203 CONNECTOR SHIM 7011-309A
J1004 CONN, 96-PIN, 3-ROW CS-514
P1002,1003 CONNECTOR, 48-PIN, 3-ROW CS-748-3
R201-205,207­210,212
U201-203 IC, 4-CHANNEL PWR DRIVER, 2549B IC-1044

Table 7-3

Model 7011-KIT-R 96-pin female DIN connector kit parts list

Description

96-PIN FEMALE DIN CONNECTOR CS-787-1
BUSHING, STRAIN RELIEF BU-27
CABLE ADAPTER, REAR EXIT (INCLUDES TWO CABLE
CLAMPS)
CONNECTOR HOUSING CS-788

RES, 10K, 5%, 1/4W, COMPOSITION OR FILM R-76-10K

Keithley
part no.

CC-64

Keithley
part no.

4-40X1/4PPHSEM

7-3

43 2

7021-170

NO.

A

A1

RELEASED

19587

ADDED NO POP NOTE FOR MODEL 7037,K201,K202

CR202,CR201,J204,J205,C204,R211,R206,R213,Q201

1

DATEENG.REVISIONECA NO.LTR.

SZ

2/11/97

D

D

TOP SIDE COMPONENTS (SIDE -06)

C

J1004

*

Q201

*

R206

*

R213

K202

*

CR202

*

R211

J202

C204

R202

R212

R210

R209

*

C203

U203

R208

R207

R204

P1003

R205

U201

CR201

C202

R203

R201

*

J205

*

*

K201

J204

*

*

U202

J203

C201

P1002

J201

B

C

B

NOTE: FOR COMPONENT INFORMATION, SEE PRODUCT STRUCTURE.

*DO NOT POPULATE THESE PARTS FOR MODEL 7037;

R211,C204,K202,CR202,Q201,R213,R206,CR201,K201,J204,J205.

A

A

QTY.NEXT ASSEMBLYMODEL

1 OF 1

KEITHLEY

KEITHLEY INSTRUMENTS INC.

CLEVELAND, OHIO 44139

DIM ARE IN IN. UNLESS OTHERWISE NOTED

DIM. TOL. UNLESS OTHERWISE SPECIFIED

XX=+.01
XXX=+.005

ANG.=+1
FRAC.=+1/64

1/6/97 1:1

CAB

DO NOT SCALE THIS DRAWING

SCALEDATE

TITLE

APPR.DRN

NO.

C

43 2

USED ON

COMPONENT LAYOUT,

CONNECTOR BOARD

7021-170

1

PG

Index

A

AC frequency response 5-10

B

Basic switch configuration
(SPST) 2-1
Block diagram 6-10

C

Card connections 6-2
Card installation 4-13
Card removal 4-13
Channel assignments 5-3
Channel functionality test 6-9
Channel resistance tests 6-3
Channel to channel isolation tests 6-5
Closing and opening channels 5-5
Common-mode isolation tests 6-8
Component layouts and schematic
diagrams 7-1
Configuring digital I/O input pull-up
resistance 4-4
Configuring digital I/O output
logic 4-4
Contact potential tests 6-5
Controlling devices using pull-up
resistors 3-2
Controlling pull-up devices 3-1

D

Digital I/O connections 4-2
Digital I/O input channel control 6-12
Digital I/O maximum signal
levels 5-1
Digital I/O output channel
control 6-12
Digital inputs 3-2
Digital outputs 3-1

E

Environmental conditions 6-2

F

Factory service 7-1
Features 1-1

G

Ground loops 5-9

H

Handling and cleaning
precautions 6-1
Handling precautions 1-2, 4-2

I

ID data circuits 6-11
IEEE-488 bus operation 5-6
Input connection scheme 4-12
Inspection for damage 1-2
Instruction manual 1-3

K

Keeping connectors clean 5-10

M

Magnetic fields 5-8
Mainframe control of the card 5-2
Manual addenda 1-2
Measurement considerations 5-8
Model 7037 installation and
removal 4-13
Multi-pin (mass termination)
connector card 4-5

O

Offset current tests 6-4
Optional accessories 1-3
Ordering information 7-1
Output connection schemes 4-11

i-1

P

Parts lists 7-1
Path isolation 5-8
Performance verification 6-2
Power-on safeguard 6-12
Power limits 5-1
Principles of operation 6-10
Pull-up resistors 4-2

R

Radio frequency interference 5-9
Reactive loads 5-1
Reading input channels 5-6
Recommended equipment 6-2
Relay control 6-12
Relay power control 6-12
Relay switch maximum signal

levels 5-1

Repacking for shipment 1-3

S

Safety symbols and terms 1-2
Scanning channels 5-5
Shipping contents 1-2
Special handling of static-sensitive
devices 6-9
Specifications 1-2

T

Troubleshooting 6-13
Troubleshooting access 6-13
Troubleshooting equipment 6-13
Troubleshooting procedure 6-14
Typical digital I/O connection

schemes 4-11

Typical relay switch connection

schemes 4-10

U

Unpacking and inspection 1-2

V

Voltage source jumper 4-2

W

Warranty information 1-2

i-2

Service Form

Model No. Serial No. Date
Name and Telephone No.
Company

List all control settings, describe problem and check boxes that apply to problem.

❏

Intermittent

❏

Analog output follows display

❏

Particular range or function bad; specify

IEEE failure

❏
❏

Front panel operational

Display or output (check one)

❏

Drifts

❏

Unstable
Overload

❏
❏

Calibration only

❏

Data required

(attach any additional sheets as necessary)
Show a block diagram of your measurement system including all instruments connected (whether power is turned on or not). Also, describe

signal source.

Obvious problem on power-up

❏
❏

All ranges or functions are bad

❏

Unable to zero

❏

Will not read applied input

❏

Certificate of calibration required

Batteries and fuses are OK

❏
❏

Checked all cables

Where is the measurement being performed? (factory, controlled laboratory, out-of-doors, etc.)

What power line voltage is used? Ambient temperature? °F

Relative humidity? Other?

Any additional information. (If special modifications have been made by the user, please describe.)

Be sure to include your name and phone number on this service form

.

Keithley Instruments, Inc.

28775 Aurora Road
Cleveland, Ohio 44139

Printed in the U.S.A.