Keithley 7056 Service manual

Model 7056

General Purpose Scanner Card

Instruction Manual

Contains Operating and Servicing Information

Document Number: 7056-901-01 Rev. D

WARRANTY

Keithley Instruments, Inc. warranty this product to be free from defects in tnatcrial and
workmanship for a period of I year from date of shipment.

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

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

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

LIMITATION OF WARRANTY

This warranty does not apply to defects resulting from product modification without
Keitbley’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 KBITHLEY 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.

Model 7056

General Purpose Scanner Card

Instruction Manual

01992, Kcithlcy Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

January 1992, First Printing

Document Number: 7056-901-01 Ilcv. D

Safety Precautions

The following safety precautioos should be obsewed before using this product and any asno­ciated instrumcntatioo. Although some inrtromeots and accessories woold nonnally bo used
with nowhazardous voltages, there arc situations wberc hazardous conditions may be present.

This product is intended for use by qualified personnel who rccogoiu: shock hazards and are
familiar with tbc safety pnxaotions rcqoircd to avoid possible injuly. Read lbe operating it]­formation carefully before using the product.

‘The types of product users arc:
Kesponsiblc body is tbe iodividunl or group responsible for the USC sod owinleoaoce of

equipment, for ensuring tlnt the equipment ia operated within its spccilications and operat­ing limits, and for ensuring that operators are adequately trained.

Operators use the product for its intended function. Tbey most be trained in electrical safety
procedures and proper use of the iostrument. ‘lhey most be protected from electric shock and
~onmt with hazardous live circuits.

Maintenance personnel perform mutioe procedures oo the product to keep it operadog, for
example, setting the hoc voltage or replacing consumable materials. Maintenance proccdurcs
am dcacribed in the manual. The procedures explicitly state if the operator ~nay perform them.
Othcrwisc, they should be performed only by senice pcnonoel.

Service personnel are trained to work on live circuits, sod perfoonn safe installations sod re­pairs of products. Ooly properly trained setvice personocl may perform installation and scr­vice procedures.

Exercise extreme caution whco a shock hazard is present. Lethal voltage may be present on
cable coonector jacks or test fixtures. 111~ American National Standards lostitute (ANSI)
stam that a shock hazard exists wheo 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 must be protected fmm electric shock at all timer. The responsible body
must eosum thtat wets aw pwented a.cce~s aod/orinsulatcd from every connection point. lo some
cases, conoectiuns most be exposed to potential buman cootact. Product usa io these circuo­stances must be trained to protect themselves from the risk of electric shock. If the circuit is ca­pable of operating at or abovc 1wO volts, no conductive part of the circuit may be exposed.

AY described in the Ioteroational Electratechnical Commission (IEC) Standard IEC 664, dig­ital multimcter measuring circuits (e.g., Keifhley Models 175A, 199, 2OOQ,2COl, 2002, and

2010) are Installation Category II. All other instruments signal tennioals are Installation Cat­egory I and must oat be conoected to mains.

Do not conoect switching cards directly to unlimited power circuits. They are inlendcd to bc
used with impedance limited sources. NEVER connect switching cards directly to AC mains.
Wheo conoccting sources to switching cards. iostall protective devices to limit fault current
sod voltage to tbc card.

Before operating ao 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 bcforc each oso.

For maximum safety, do not touch the product, test cables, or any other instrumcots while pow­er is applied to the circuit under test. ALWAYS remove power from the entire test system sod
dischuge soy capxitors before: coooccting or disconnecting cables or jumpers, installing 01

removing switching cards. or making iotemtil chaogcs, socb as installing or nzmoviog jumpers.
Vu not touch soy object that could provide a con-cot path to tbc common side of the circuit

under test or power line (eatth) ground. Always make measurements witb dry hands while
standing oo a dly, insulated surface capable of withstanding tbc voltage bciog measured.

The instrument and accessories most be used in accordance with its specifications and op­eratiog iostructioos or tbe safety of the equipment may be impaired.

Do not exceed the maximum signal levels of the instruments and accessories. as defined in
tbe speciticationr sod operatiog information, and es show on the instrument or test fixture
panels, or switcbiog cant.

When fores are used in a product, replace with same type sod rntiog forcootioued pmtectioo
against fire hazard.

Cbassir connections must only be used as shield coooectioos for me~suriog circoits, NOT as
safety eaflh ground connections.

If you are using II test fixture, keep the lid closed while power is applied to the device under
test. Safe operation requires tbe we of a lid interlock.

1ra@

screw is present, connect it to safety earth ground uaiog the wire recommended in

the user documentation.

The ! symbol on an iostroment indicates that the user should refer to the operating ill-

n

stmctions located io tbc manual.

The h

symbol on al iostmment shows that it CNI source or IIICRIIUII: loo0 volts or more, ill­eluding the combined etTect of normal ad common mode voltages. Use stiuldarrl safety precau­lions to avoid pcrsooal cootect with these voltages.

TIE WARNING beading in A manual enplaios dangers that might result in personal injury or
death. Always read the associated information wy carefully hcfore ptxformiog the indicated

pC"CCdU~C.

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

lostrumcntatioo and accessories shall not be connected to humans.

Before performing any maintenance, disconnect the line cord and all test cables.

To maintain pmtcctioo from electric shock and ftre, replacement components in mains cir­coils, including the power transfouner, test leads, and ioput jacks, must he purchased from
Keithley Instruments. Standard fuses, with applicable national safety appmvals, may be used

if the ratiog sod type are the same. Other components that are not safety r&ted may hc por-

chased from other suppliers as long as they are equivalent to tbe original component. (Note
that selected parts should be purchased only through Keithley Iostmmcnts to maiotain acco­racy sod fonctiooality of the product.) If you we unsure about the applicability of a replacc­ment 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 instrument only. Do not apply cleaner directly tb the instrument or allow liquids to
enter or spill on the instrument. Products that consist of a circuit hoard with no case or cbas­sis (e.g., data acquisition board for installation into a computer) should neverrequire clean­ing if handled according to instructiuns. If the board becomes contaminated sod operation

is affected. the hoard should he returned to the factory for proper cleaninglserviciog.

tie”. 2rB

SPECIFICATIONS

7056 GENERAL PURPOSE SCANNER CARD

CHANNELS PER CARD: IO in 2-pole mode, 20 in I-pole mode.
CONTACT CONFIGURATION: 2- le Form A, includes Model 7055 Quick LXs-

~omeCt Card. HI or LO switch
guard connection

CONNECTOR TYFE: Screw temina,, No. 18 AWG ma.ximum wire size. Tem,i,,a,s

mounted on 7055 quick dtscok potion of 7056.
RELAY DRIVE CURRENT: 24mA per relay typical.
MAXIMUM SIGNALsLEVEL: 150”. 25hA, IOV.$ peak (resistive load).

CCl,“JT LIFE: 10 dosures (cold switching); 10 ciosores (at maximum signal
CONTACT RESISTANCE: cZI2 to rated life.

CONTACT POTENTIAL: <lC@V per contact pair input to output with copper

leads (c5OpV typical).

ACNATtON TIME: <2ms, exclusive of mainframe.
CHANNEL ISOLATION: >lOgQ, OOpF typical; MdB into 500 @ I-.

INPUT ISOLATION:

Differential: >lOgP and <50pF typical.

Common Mode: >lOgQ and 45OpF typical.
COMMON MODE VOLTAGE: <,50” peak.
ENVIRONMENT:

operating: 0’ to MT, up to 3sT at 70% RH.

storage -WC to WC.
DIMENSIONS, WEIGHT: 32mm high x 114mm wide x 272mm long K25 in. x

4.5 in. x 10.75 in.). Net weight 027kg (9.5 oz.).

to a eerlerete outout for l-m& mode, common

ecr

. . .

Spedfications subject to change without notice.

BecauseofhighimpedanceoftheboardsSedalcareshouldbetakeninboth
handling and using the board to prevent

board by the edges when win it and kee
To dean the board use distill
Thoroughly saub the beard and then remove all water residue with dry nitrogen gas.
After the board is dean bake for five hours at 54°C and low relative humidity.

e% %

NOTE

egradatmn of prfomence. Handle the

water an a dean cotton swab or soft brush

it free of body oils, dirt and contaminants.

TABLE OF CONTENTS

SECTION l-GENERAL INFORMATION

1.1

Introduction ............................................

1.2

Warrann/ Information ....................................

1.3

ManualAddenda ........................................

SECTION Z-OPERATION

lntraduction ............................................

2.1

2.2

Wiring and Installation. ...................................

2.3

Operating Considerations .................................

SECTION 3--SERVICING INFORMATION

Introduction ............................................

3.1

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

3.2

Performance Verification ..................................

3.3
SECTION 4-REPLACEABLE PARTS

4.1

Introduction ............................................

ReplaceablePans ........................................

4.2

Ordering Information .....................................

4.3

4.4

FactoryService ..........................................

Component Layout and Schematic Diagram

4.5

LIST OF FIGURES

.................

3
3
5

7
7
7

13
13
13
13
13

1

Typical Channel, Voltage Scanner Mode

Typical2by5Matrix ....................................

2
3

Channel Numbering-l-Pole ..............................

Thermal Offset Test ......................................

4
5

Model 7056 Timing Test in Model 705. ......................

Model7056 Isolation Test in Model 705

6
7

Differential Input Isolation .................................

Channel Isolation ........................................

a

Model7055, Component Location Drawing.

9

Model 7056, Component Location Drawing.

10
11

General Purpose Scanner Card, Schematic Diagram

LIST OF TABLES

1

Recommended Test Equipment ............................

2

Model 7055 Replaceable Parts List ..........................

Model 7056 Replaceable Parts List ..........................

3

....................

.....................

.................

.................

..........

3
4
6
a

9
10
11
12
15
16
17

7

14
14

SECTION 1

GENERAL INFORMATION

1.1 INTRODUCTION

The Model 7056 is e general purpose relay ecenner plug-in card which is field-

installable in en appropriate Kelthley ecenner mainframe (e.g. Model 706). The
Model 7056 w/II switch up to 10 channels. The card can be used 88 e voltage
ecenner. independent relay card or e matrix card. The Z-pole switching 18 ec­compllshed in less than 2ms and the expected relay life is lo8 closure8 et the
maximum contact ratings. Barrier strips ere used to facilitate input end output
connections to the relay ecenner plug-in card. The plug-in card can easily be
removed through the rear panel of the ecenner mainframe. The Model 7066
provides the connection to the individual channels via the screw clamp type
terminal strips.

1.2 WARRANTY INFORMATION

Warranty information is staled on the inside front cover of the manual. If there is
e need for service, contact the Keithley representative or authorized repair facility
in your area. Check the back cover of this manual for addresses. The service
form supplied at the end of the manual should be used to provide the repair
facility with adequate informoiion concerning any difficulty.

1.3 MANUAL ADDENDUM

Improvements or changes to this manual will be explained on en addendum in­cluded with this manual.

1