Keithley 7071 User manual

Model 7071 General Purpose Matrix Card
Instruction Manual
Contains Operating and Servicing Information
Publication Date: June 1991
Document Number: 7071-901-01 Rev. D

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 batter-
ies, 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 wannty, write or call your local Kcithley representative, or contact Keithley headquarters in Cleveland, Ohio. You
will bc 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 leak
age, 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 SUALL BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRU-
MENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POS-
SIBILITY 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 DAM-
AGE TO PROPERTY
STATEMENT OF CALIBRATION
This instrument has been inspected and tested in accordance with specifications published by Keithley Instruments, Inc,
The accuracy and calibration of this instrument me traceable to the National Bureau of Standards through equipment which is cali-
brated at planned intervals by comparison to certified standards maintained in the Laboratories of Keithley Instruments, Inc.

Instruction Manual
Model 7071
General Purpose Matrix Card
01984 Keithley Instruments, Inc.
Instruments Division
Cleveland, Ohio, U.S.A.
Document Number: 7071-901-01

Safety Precautions
The following safety precautions should be obsewed before using
this product and any associated instrumentation. Although some in-
~trument~ and accessories would nomudly bc used with non-haz-
ardous voltages, there are situations where hazardous conditions
may be present.
This product is intended for “se by qoalilied personnel who recog-
nize shock hazards and are familiar with the safety precautions re-
quired to avoid porsiblc 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 “se
and maintenaocc of equipment, for ensuring that the equipment is
operated within its specifications and operating limits. and for en-
suring that operators are adequately trained.
Operators “se the product for its intended function. They most be
trained in electrical safety procedorcs and proper “se of the instru-
ment. They must be pro&ted from electric shock and contact with
hazudous live circuits.
Maintenance personnel perform routine procedures on the product
to keep it operating, for example, setting tbc line voltage or replac-
ingconsumable materials. Maintenance procedures aredescribed in
the manual. The procedures explicitly state if tbc operator may per-
form them. Otherwise, they should be performed only by service
personnel.
Service personnel arc trained to work on live circuits, and perform
safe installations and repairs of products. Only properly trained ser.
vice personnel may perform installation and sewicc 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 before
measuring.
Users of this product most be protected from electric shock at all
times. The responsible body most ensure that users arc prcvcnlcd
accessand/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 10protect tb~n~s~l~~s
from the risk of electric shock. If the circuit is capable of operating
at or above 1000 votts, no conductive part of the circuit may be
exposed.
As described in tbc lntcmational Electrotechnical Commission
([EC) Standard IEC 664, dig&l multimeter measuting circuits
(e.g., Kcithley Models 175A. 199.200% 2001. 2002, sod 2010) are
Installation Category II. All other iostmmcots signal tuminals arc
Installation Category I sod must not be connected to maios.
Do not connect switching cards directly to unlimited powcrcircuits.
They are intended to hc used with im~daoce limited sour~cs.
NEVER connect switching cards directly to AC mains. When cons
nccth~gSOU~CCSto switching cards, insult protoctivc devices 1” lim
it fault torrent and voltage to the card.
Before operating an iostromcnt, make sure the line cord is connect-
cd to a properly grounded power reccptaclc. Inspcc~ the connecting
cables. test leads, ;ind jumpers for possible war. cracks, or breaks
before each use.
For maximom safety. do nut 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 bcforc: connecting or disconnecting cables or jumpy
crs, installing or removing switching cards. or making intcnul
changes, such as installing or removing jumpers.
Do not touch any “bjcct that could provide a curreot path to the
comm”” side of the circuit under test or power line (earth) ground.
Always make mea~~ren~cnts with dry hands while stmding on n
dry, insulated surface capable of withstanding the voltage being
measured.

The instrument and accessories must be used in accordance with its
specitications and operating instructions or the safety of the equip-
ment may be impaired.
Do not exceed the maximum signal levels of the instruments and ac-
cessories, as defined in the specifications and operating informa-
tion, and as shown on the instrument or test fixture panels, or
switching card.
when fuses are used in aproduct, replace with same type and rating
for continued protection against fin: 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 ap-
plied to the device under test. Safe operation requires the use of a
lid interlock.
Ifa@ screw is present, connect it to safety earth ground using the
wire recommended in the user documentation.
m A symbol on an instrument indicates that the uscr should re-
fer to the operating instructions located in the manual.
Then symbol on an instrument shows that it can source or mca-
sum 1003 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. Always read the associated infor-
mation very carefully before performing the indicated procedure.
The CAUTION heading in a manual explains hazards that could
damage the instrument. Such damage may invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and
all test cables.
To maintain protection from electric shock and fire, replacement
components in mains circuits, including the powcr transformer, test
leads, and input jacks, must be purchased from Keithley Instn-
merits. Standard fuses, with applicahlc 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 asthey are equivalent to the original component. (Note that sc-
lead 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
Keithlcy Instruments office for information.
To clean an instrument, use a damp cloth or mild, water based
cleaner. Clean the exterior of the insrmment only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill
on the instmmcnt. Products that consist of a circuit board with no
case or chassis (e.g., data acquisition board for installation into a
computer) should never require cleaning if handled according to in-
stmctions. If tbc board becomes contaminated and operation is af-
fccted, the board should be returned to the factory for proper
cleaning/servicing.
Rev. IO/99

SAFETY PRECAUTIONS
The following safety precautions should be observed before using the Model 7071 and the associated instru-
malts.
This matrix card is intended for use by qualified personnel who recognize shock hazards and are familiar
with the safety precautions required to avoid possible injury. Read over this manual carefully before using
the matrix card.
ALWAYS remove power from the entire system (Model 707, test instruments, DUT, etc.) and discharge any
capacitors before doing any of the following:
1. Installing or removing the matrix card from the mainframe.
2. Connecting or disconnecting cables from the mahix card. The pins of the Model 7078~MTC cable con-
nectors are easily accessible making them extremely hazardous to handle while power is applied.
3. Making internal changes to the card (such as removing or installing jumpers and quick-disconnect ter-
minal blocks).
Exercise extreme caution when a shock hazard is present at the test fixtire. User-supplied lethal voltages
may be present on the fixture or the connector jacks. The American National Standards Institute (ANSI)
states that a shock hazard exists when voltage levels greater than 30V Rh4Sor 42.4V peak are present. A good
safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring.
Do not exceed ZOOVbetween any two pins or between any pin and earth ground
Inspect the connecting cables and test leads for possible wear, cracks, or breaks before each use.
For maximum safety, do not touch the test fixture, test cables or any instruments while power is applied to
the circuit under test.
Do not touch any object which could provide a current path to the common side of the circuit under test or
power line (earth) ground.
Do not exceed the maximum signal levels of the test fixture, as defined in the specifications and operation
section of this manual.
Do not connect the matrix card directly to unlimited power circuits. This product is intended to be used with
impedance limited sources. NEVER connect the matrix card directly to ac mains.
When connecting sources, install protective devices to limit fault current and voltage to the card
The chassis connections on the PC board (located behind the front panel of the matrix card) must only be
used as shield connections for measuring circuits, NOT as safety earth ground connections.

SPECIFICATIONS
MATRIX CONFIGURATION:
8 rows by 12 columns.
CROSSPOINT CONFIGURATION:
Spole Form A.
CONNECTOR TYYPE:Quick disconnect using
38 pin umnectom or screw temals (HI,
LO, Guard).
ISOLATION:
Path WvIIiz, 1MO load): > 1OWo.clOpF.
>4OdB.
DifferentfaI: 109, 45pF nominal.
Common Mode: lO’R, 165pF nominal.
INSERTION LOSS (YMHz, 50” source, IMR
load): O.ldB tvoicaf.
MAXIMUM SIGNAL LEVEL:. 2CQV.lA
cany/O.SA switched. 1OVA peak (resistive
load).
COMMON MODE VOLTAGE: 2ooVmaximum
between any 2 pins or chassis.
CONTACT LIFE:
Cold Switching: 10’ closures.
At M&mum Sigrul Level: 10’ closures.
PATH RESISTANCE ,per conductor): <0.50
initial, <1.5ll at end of contact life.
CONTACT POTENTIAL: <5pV per aosspoint
(HI to LO).
OFFSET CURRENT: <lOOpA.
,.
SdBBANDWIDTH (IMfl load): 5MHz typical.
RELAY DRIVE CURRENT (Per crosspoint):
15mA.
RELAY SE’ITLING TIME: <3mr.
ENVIRONMENT:
Opedng: O”to WC, up to 35’C at 70%R.H.
Storage: -25 to +65-C.
ACCESSORY SUPPLIED: Instnxtion manual
ACCESSORIES AVAILABLE:
Model 7078~CIT: Contact Insertion and
Extraction Tools
Model 707%HCT: Hand Crimping Tool
Model 707SWT: Connector Kit.
Model 707EMTC: Mass Terminated Cable
Assembly, 6m (20 ft.)

Contains information on Model 7071features, specifica-
tions, and accessories.
SECTION 1
General Information
Details installation of the Model 7071General Purpose
Matrix Card within the Model 707 Switching M&ix,
covers card connections, and also discusses basic m&ix
configurations and matrix expansion.
SECTION 2
Operation I
Gives two typical applications for the Model 7071, in-
cluding thick film resistor network testing and tran-
sistor testing.
SECTION 3 ’
Applications
Contains performance verification procedures, trouble-
shooting information and principles of operation for
the matrix card.
SECTION 4 /
Service Information
Lists replacement parts, and also includes component
layout and schematic drawings for the Model 7071.
SECTION 5 /
Replaceable Parts i

SECTION i-General
Table of
Information
1.1 INTRODUCIION
1.2 FFXURES
1.3 WARRANTY INFORMATION
1.4 MANUAL ADDENDA
1.5 SAFETY SYMBOLS AND TERMS ............
1.6 SPECIFICATIONS ...........................
1.7 UNPACKING and INSPECTION ..............
1.7.1 Inspection for Damage ......
1.7.2 Shiuuine Contents .........
1.73 Inst%ti;n Manual
1.8 REPACKING FOR SHIPMENT
1.9 OPTIONAL ACCESSORIES..
SECTION 2-Operation
.........
.........
.........
.........
.........
2.1
2.2
2.3
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.5
2.5.1
2.5.2
2.5.3
2.6
2.6.1
2.6.2
2.6.3
2.6.4
2.7
2.7.1
2.7.2
2.7.3
INTRODUCITON ........................ ..........
HANDLING PRECAUTIONS ........................ ..........
Contents
.........................
.........................
.........................
.........................
.........................
.........................
.........................
.........................
..........................
.........................
.........................
.........................
CARD INSTALLtUlON AND REMOVAL ......
BASIC MAIRIX CONFIGURATIONS .......... ......
Single-Ended Switching .................... ...... .,....
Differential Switching .......................
Guarding ................................... ...... ......
Sensing .................................... ...... ......
CONNECTION METHODS ....................................................................
Connection Methods Using Mass Terminated Cable (Model 7U78MTC). ..........................
Direct Connection Method ..................................................................
Connection Method Using Connector Kit (Model 7078~KIT) ....................................
MATRIXEXI’ANSION ........................................................................
Narrow Matrix Expansion.. .................................................................
WideMatrixExpansion .....................................................................
PartiaIMatrixImplementation ................................................................
Mainframe MahixExpansion .................................................................
TYT’ICAL CONNECI-ION SCHEMES ...........................................................
Single Card System .........................................................................
Multiple Card System .......................................................................
Multiple Mainframe System ..................................................................
...........
...........
SECTION 3-Applications
3.1 INTRODUCTION ............................................................................ 3-l
3.2 THICK FILM RESISTOR NETWORK TESTING ................................................. 31
3.2.1 Four-terminal Ohms Measurements ........................................................... 3-2
3.2.2 Voltage Divider Checks ...................................................................... 33
3.2.3 Current Shunt Checks ....................................................................... 3-5
3.3 TRANSISMR TESTING ....................................................................... 3-5
3.3.1 Current Gain Checks ....................................................................... 3-7
3.3.2 I, and V., Measurements ................................................................... 37
‘
;
2
2
2
2
2
1-l
1-l
1-l
1-l
l-1
l-1
1-l
l-1
1-2
1-2
1-2
1-2
2-l
2-l
2-l
2-2
2-b
2-6
2-6
2-6
2-8
2-9
!-15
!-15
t-18
98
!-19
-20
-20
:-21
:-21
,722
-22

SECTION 4-Service Infmmation
4.1
4.2
4.3
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
4.4.7
4.5
4.5.1
4.5.2
4.5.3
4.6
4.7
4.7.1
4.7.2
INTRODUCITON .............................................................................. 4-l
HANDLING AND CLEANING PRECAUTIONS .................................................. 4-1
RELAY TEST PROGRAM SETUP ................................................................ 4-l
PERFORMANCE VERIPICATION ............................................................... 42
EnvhonmentaI Conditions .................................................................... 43
Recommended Equipment .................................................................... 43
Path Resistance Tests ......................................................................... 43
Offset Current Tests.. ........................................................................ 45
Contact Potential Tests ........................................................................ 4-7
Path Isolation Tests ........................................................................... 49
..
DtierenhaI and Common Mode Isolation Tests ................................................. 411
PRINCIPLESOF OPERATION ................................................................. 413
Card Identification ........................................................................... 4-W
switching circuitry .......................................................................... 414
Power Up Sateguard ......................................................................... 414
SPECL4L HANDLING OF STATIC-SENSITIVE DEVICES ......................................... 414
TROUBLESHOOTING ......................................................................... 415
Recommended Equipment ................................................................... 415
Troubleshooting Procedure ................................................................... 415
SECTION S-Replaceable Parts
5.1 INTRODUCIlON .............................................................................. 5-l
5.2 PARTS LISTS ..................................................................... : ............ 5-l
5.3 ORDERING INFORMATION.. .................................................................. 5-l
5.4 FACTORY S?ZR\
JICE ............................................................................ 5-l
5.5 COMPONENT LAYOUT AND SCHEMATIC DIAGRAM. .......................................... 5-l

List of Tables
SECTION 2-Operation
2-l Column Number Assignments .................................................................. 2-2
2-2 Model 7071 Available Accessories ............................................................... Z-10
2-3 Model 7078 MTC Wire Identification ............................................................ Z-12
2-4 Narrow Matrix Expansion* ..................................................................... Z-18
2-5 Wide Matrix Expansion* ....................................................................... 2-19
SECTION 4-Service Information
41 Verification Equipment ......................................................................... 44
42 Path Isolation Tests ............................................................................ 4-10
4-3 Differential and Common Mode Isolation Test ................................................... 411
4-4 Recommended Troubleshooting Equipment ...................................................... 4-15
45 Troubleshooting Summary* .................................................................... 4-15
iii/iv

List of Illustrations
SECTION 2-Operation
2-l MatrixCard Installation ........................................................................ 2-3
2-2 CableClamp Assembly ......................................................................... 2-4
2-3 Simplified Schematic of Model 7071 ............................................................. 2-5
2-4 Single-Ended Switching Example (Guard Used as Shield) ......................................... 2-6
2-5 Differential Switching Example (Shielded) ........................................................ 2-7
2-6 Driven Guard Example (Shielded) ............................................................... 2-7
2-7 SensingExample(Shielded) .................................................................... 2-8
2-8 Connections Using two Model 70%MTC Cables ................................................. 2-11
2-9 Connecting PlugtoRectacle .................................................................... 2-U
2-m Receptacle Contact Assignments ................................................................ 2-U
2-u Connections Using One Model 7078-MTC Cable Cut in Half ...................................... 2-14
2-w. TerminalBlock Connections .................................................................... 2-15
2-u CablePreparation ............................................................................. 2-16
2-14 Connecting Beldon 9734 Cable to Receptacle .....................................................
2-V
2-15 Cable Positions ...............................................................................
2-V
2-16 Narrow Matrix Example (8 x 36) (Backplane Jumpers Not Removed) .............................. 2-18
2-v Two 8 x 36 Matrices Using Six Model 7071s. .................................................... 2-19
2-18 Wide Matrix Example (16 x 24) ................................................................ 2-20
2-19 Partial Matrix Expansion (16 x 24). ............................................................. 2-21
2-20 Single Card System Example. .................................................................. 2-22
2-21 MultipleCard SystemExample ................................................................. 2-23
2-23 Plug Contact Assignments ..................................................................... 2-25
2-22 Multiple Mainframe Example .................................................................. 2-24
SECTION 3-Applications
3-l Thick Film Resistor Network Testing ............................................................. 3-l
3-2 4TerminalOhmsMeasurements ................................................................. 3-2
3-3 Voltage Divider Checks ......................................................................... 3-4
3-4 Current Chunt Checks.. ....................................................................... 3-6
3-5 Transistor Testing .............................................................................. 3-7
3-6 Transistor Current Gain Checks ................................................................. 3-8
3-7 Common-Emmitter Characteristics of an NPN Silicon Transistor. ................................... 3-9
El Transistor IE Measurements .................................................................... 510
Transistor VgE Measurements. .................................................................. 3-11
SECTION 4-Service Information
41 Relay Test Setup ............................................................................... 42
42 PathResistanceTesting ......................................................................... 44
43 Differential Offset Current Testing ............................................................... 46
4-4 Common Mode Offset Current Testing ........................................................... 4-7
45 Contact Potential Testing ........................................................................ 48
46 Path Isolation Testing (Guarded). ............................................................... 410
47 Differential Isolation Testing .................................................................... 4-U
48 Common Mode Isolation Testing ............................................................... 4-U
49 IDD~ Tuning Diagram ....................................................................... 414
410 Receptacle Contact Identification ................................................................ 416
v/vi

SECTION 1
General Information
1.1 INTRODUCTION
This section contains general information about the Model
7071 General Purpose Matrix Card and is arranged in the
following manner:
1.2 Features
1.3 Warranty Information
1.4 Manual Addenda
1.5 Safety Symbols and Terms
1.6 Specifications
1.7 Unpacking and Inspection
1.8 Repacking for Shipment
1.9 Optional Accessories
1.2 FEATURES
The Model 7071 is a general purpose, three-pole 8 x 12
(8 row by I2 column) matrix card. Some of the key features
include:
. Guard capability. Each HIILQ path pair on the PC board
is surrounded by a third path that can be used for
guarding.
l Low contact potential and offset current for minimal
effects on low-level signals.
l Quick disconnects using the “rack and panel” receptacles
on the rear panel or terminal blocks on the PC board.
1.3 WARRANTY INFORMATION
Warranty information is located on the inside front cover
of this instruction manual. Should your Model 7071require
warranty service, contact the Keithley representative or
authorized repair facility in your area for further informa-
tion. When returning the matrix 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.
1.4 MANUAL ADDENDA
Any improvements or changes concerning the matrix card
or manual will be explained in an addendum included
with the unit. Be sure to note these changes and incor-
porate them into the manual.
1.5 SAFETY SYMBOLS AND TERMS
The following symbols and terms may be found on an in-
strument or used in this manual.
The symbol A on an instrument indicates that the user
should refer to the operating instructions located in the
instruction manual.
The symbol & on an rnshument 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 matrix card. Such damage
may invalidate the warranty.
1.6 SPECIFICATIONS
Model 7071specifications may be found at the front of this
manual. These specifications are exclusive of the matrix
mainframe specifications.
1.7 UNPACKING AND INSPECTION
1.7.1 Inspection for Damage
The Model 7071is 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.
1-l

GENERALINFORMATION
Handling Precautions:
1. Always grasp the card by the handle and side edges.
Do not touch the edge connectors and do not touch
board surfaces or components.
2. When not installed in a Model 707 mainframe, keep the
card in the anti-static bag and store in the original pack-
ing 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.
lf you are going to install the card in the Model 707 main-
frame at this time, be sure to follow the additional handl-
ing precautions explained in paragraph 2.2
1.7.2 Shipping Contents
The following items are included with every Model 7Ril
order:
l Model 7071 General Purpose Matrix Card.
l Model 7071 Instruction Manual.
l Additional Accessories as ordered. Note that the Model
7VBMTC may be shipped in a separate packing carton.
1.7.3 Instruction Manual
The Model 7071 Instruction Manual is three-hole drilled
so that it can be added to the three-ring binder of the
Model 707 Switching Matrix Instruction Manual. After
removin
binder a8 the plastic wrapping, place the manual in the er the mainframe instruction manual. Note that
a manual identification tab is included and should precede
the matrix card instruction manual.
If an additional instruction manual is required, order the
manual package, Keithley part number 7071-901-00. The
manual package includes an instruction manual and any
pertinent addenda.
1.8 REPACKING FOR SHIPMENT
Should it become necessary to return the Model 7071for
repair carefully pack the unit in its original packing car-
ton or the equivalent, and include the following
information:
l Advise as to the warranty status of the matrix card.
l Write ATTENTION REPAIR DEPARTMENT on the ship
ping label.
l Fill out and include the service form located at the back
of this manual.
1.9 OPTIONAL ACCESSORIES
The following accessories are available for use with the
Model 7071.
Model XIB-CIT Contact Insertion and Extraction Tools
The Model 707%CIT contains an insertion tool that is used
to insert wire crimp tail contacts into “rack and panel”
plugs and receptacles. Conversely, the extraction tool is
used for the removal of the contacts.
Model 707&HCT Hand Crimping Tool
The Model 7U7&HCT is used to attach wire crimp tail con-
tacts to #l8 to %26AWG stranded wire.
Model 7U784UT Connector Kit (Plug)
The Model 7UBKlT contains the parts to assemble one
“rack and panel” plug. This plug will mate to either the
ROWS or COLUMNS receptacle on the rear panel of the
card. Parts contained in the kit indude the phzg, plug hous-
ing and 40 wire crimp tail contacts.
Model 7U78-MTR Connector Kit (Receptacle)
The Model 7RBMTR contains the parts to assemble and
mount one “rack and panel” receptade. Parts contained
in the kit indude the receptade, 40 wire crimp tail con-
tacts, and mounting hardware.
Model 7lVEMTC-5 Mass Terminated Cable Assembly
The Model iQ%M’lC-5 is a 5foot (1.5 meter), 36-conductor
cable terminated with a “rack and panel” plug on both
ends. This cable connects to either the ROWS or COL
UMNS receptade on the rear panel of the card. This cable
is commonly cut in half to provide two separate cables.
The cables can then be used to connect to both the ROWS
and COLUMNS receptades. The unterminated ends of the
cables are then connected to instrumentation and DUTs.
l-2

Model 7078~MTC-20 Mass Terminated Cable Assembly CS-570-3 Quick Disconnect Terminal Block
This cable assembly is the sames as the Model Three-terminal block accomodating up to 16 AWG wires.
707&m-5 except that it is 20 feet (6 meters) in length. Mates to matrix board pin terminals.
l-3114

SECTION 2
Operation
2.1 INTRODUCTION
CAUTION
Do not store the csrd by leaning it against an
This section contains information on aspects of matrix card
operation and is arranged as follows:
object (such as a wall) with Its edge connectors
in contact with a contaminated surtace (such
as the floor). The edge connectors will become
2.2 Handling Precautions: Details precautions that should
be observed when handling the matrix card to ensure
that its performance is not degraded due to
contamination.
contaminated, and tapes and solder connec-
tions on the PC board may break as the card
bends. ALWAYSstore the card (in its anti-static
bag) in the original shipping carton.
2.3 Card Installation and Removal: Covers the basic pro-
cedure for installing and removing the card from the Dirt build-up over a period of time is another possible
Model 707 Matrix. source of contamination. To avoid this problem, operate
the mainframe and matrix card only in a clean
2.4 Basic Matrix Configurations: Explains some the basic environment.
ways that a matrix can be used to source or measure.
Covers single-ended switching, differential (floating)
switching, sensing, shielding, and guarding. If the card becomes contaminated, it should be thoroughly
cleaned as explained in paragraph 4.2.
2.5 Connections: Discusses the various methods and
techniques that can be used to connect DUB and in-
strumentation to the matrix card.
2.3 CARD INSTALLATION AND REMOVAL
2.6 Matrix Expansion: Discusses the various matrix con-
figurations that are possible by using multiple cards.
The significance of the Model 707 backplane row
jumpers on matrix configurations is also covered here.
2.7 Typical Connection Schemes: Provides examples of ex-
temal connections for single card, multiple card and
multiple mainframe systems.
2.2 HANDLING PRECAUTIONS
To maintain high impedance isolation, care should be
taken when handling the matrix card to avoid contamina-
tion from such foreign materials as body oils. Such con-
tamination can substantially lower leakage resistances,
degrading performance.
To avoid possible contamination, always grasp the card by
the handle and side edges. Do not touch the edge con-
nectors of the card and do not touch board surfaces or com-
ponents. On “rack and panel” connectors and quick-
disconnect terminal blocks, do not touch areas adjacent
to the electrical contacts.
Connections to the matrix card make it awkward to install/
remove the card in the mainframe. Thus, it is advisable
to install the card and then make connections to it. Con-
versely, cables and wires should be disconnected before
removing the card from the mainframe.
Referring to Figures Z-1and 2-2, perform the following prw
cedure to install the Model 7071 matrix card in the Model
m
1. Turn the Model 707 off.
2. Select a slot in the mainframe and remove the cover
plate. The cover plate is fastened to the mainframe
chassis with two screws. Retain the cover plate and
screws for future use.
3. With the relay side of the matrix card facing towards the
fan, feed the card into the slot such that the top and
bottom card edges seat into the the card edge guides
of the mainframe. Slide the matrix card approximately
% of the way into the mainframe.
4. If using quick-disconnect terminal blocks to make con-
nections, perform the following steps. Otherwise, pro-
ceed to step 5.
2-l

OPERATION
WARNING
To avoid electrical shock which could result in
injury or death, make sure all power is off and
stored energy in external circuitry is dischag-
ed before making any connections to the matrix
card.
A. There are two cable clamps on the rear panel of the
matrix card that serve as strain reliefs for terminal
block wires. Loosen the two screws of each cable
clamp and remove the top half of each clamp.
B. Install the pre-wired terminal blocks (see paragraph
2.52) on the matrix card. Make sure the pins on the
card are properly mated to the terminal blocks.
C. Route the wires through the rear panel cable clamps.
Make sure there is some slack in the wires between
the terminal blocks and the clamps before tightening
the clamps.
5.Slide the matrix card all the way into the mainframe and
tighten the two spring loaded panel fastenters.
WARNING
The mounting screws must be secured to en-
sure a proper chassis ground connection be-
twsen the card and the mainframe. Failum to
properly secure this ground connection may
result in petsonal injury or death due to elec-
tric shock.
NOTE
If using the terminal blocks, leave enough slack
in the external cabling so that the card can slide
out far enough to gain access to the connections.
6. To remove the card from the mainframe make sure the
Model 707 is off, power is removed from external cir-
cuitry, and then reverse the above procedure.
2.4 BASIC MATRIX CONFIGURATIONS
A simplified schematic of the Model 7071 8 x I2 matrix
card is shown in Figure 2-3. Each of the 96 crosspoints is
made up of a three-pole switch. In this simple configura-
tion, any row can be connected to any column by closing
the appropriate crosspoint switch. The columns of every
Model 7071 matrix card are numbered 1 through l2.
However, the actoal column numbers of the matrix are
determined by which mainframe slot the card is installed
in. For example, the columns of a matrix card installed in
slot 4 of the mainframe are numbered 37 through 48. Col-
umn number assignments for all six mainframe slots are
listed in Table 2-l.
Table 2-1. Column Number Assignments
Matrix
7Wl Card Location
CoIumn Numbers
I
2-2

OPERATION
MOUNTING SCREWS
Figure 2-l. Matrix Card Installation
2-3

OPERATION
Top hail of Cable Clamp
Figure 2-2. Cable Clamp Assembly
2-4

OPERATION
I
Column I
I
'
l I 11 22 33 44 55 66 77 66 99 1010 1111 1212
I
I A
A
I B
/ B
c
I D
I 1
I E
RowRow
I E
// FF
I G I G
HH
L-------------L-------------
Figure 2-3. Simplified Schematic of Model 7071
2-s