Keithley 7158 Manual de usuario

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Model 7158 low Current

Scanner Card

Instruction Manual

Contains Operating and Servicing Information

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Model 7158 Low Current Scanner Card

Instruction Manual

0 1987, Keithley Instruments, Inc.

Test Instrumentation Group

Cleveland, Ohio, U.S.A.

June 1990, Second Printing

Document Number: 7158-901-01 Rev. B

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SAFETY PRECAUTIONS

The following safety precautions should be observed before using this

product and any associated instrumentation. Although 6ome 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 us-

ing the product.

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.

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 we.

For maximum safety, do not touch the product, test cables, or any other

instruments while power is applied to the circuit under test. ALWAYS re-

move power from the entire test system and discharge any capacitors be-

fore: 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 awes-

series, as defined in the specifications and operating information, and as

shown on the instrument or test fixture rear panel, or switching card.

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 main. When connecting sources to switch-

ing cards, install protective devices to limit fault current and voltage to

the card.

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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 measur-

ing 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 on the test fixture, connect it to safety earth

ground using #18 AWG or larger wire.

The f symbol on an instrument or accessory indicates that 1OOOVor

more may be present on the terminals. Refer to the product manual for de-

tailed operating information.

Instrumentation and accessories should not be connected to humans

Maintenance should be performed by qualified service personnel. Before

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

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SPECIFICATIONS

MODEL 7158 LOW CURRENT SCANNER CARD

CHANNBLS PER CARD: 10

CONTACT CONFIGURATION: Single pole. When a channel is open, sign81 HI is con-

nected to signal LO. Signal LO is common for ail 10 channels and aulput.

CONNIXTOR TYPE; BNC

RELAY DRIVE CURRENT: lOOmA per card typical.

MAXIMUM SIGNAL LEVEL; lOOmA, 3OV, peak (resistive load)

368 BANDWImHz lM& typical.

CONTACT LIFE: 10’ closures (cold switching); 10’ closures (at maximum signal level)

CONTACT RESISTANCE: <Xl to rated life

CONTACT POTBNTIALr <20,&V

ACTUATION TIME: <Ims, exclusive of mainframe

OPPSET CURReNT: <10’“A (<3 x 10-laA typical)

COMMON MODR VOLTAGE: 3OV peak

GENRRAL

ENVIRONMENT,

Operating: 8’ to 50°C, up to 35’C at 70% RH

storage: -2.5” to 65°C

DIMENSIONS, WEIGHI! 32mm high x 114mm wide x 272mm long (1%” x 4%” x

10%“). Net weight 0.5gkg (20.5 oz.)

ACCBSSORY SUPPLIED; Model 4801 Low Noise Cable

ACCBSSORY AVAILABLG; Model 4804 t&x female to BNC male adapter

Specifications subject to change without notice.

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TABLE OF CONTENTS

SECTION 1 - GENERAL INFORMATION

1.1

1.2

1.3

1.4

I.5

I.6

Introduction. ........................................ 1

warrant\~ Information ................................ 1

Manual.Addenda .................................... 2

Safety Symbols and Terms ........................... 2

Unpackmg and lnspectlon ............................ 2

Specifications ........................................ 3

SECTION 2 - OPERATION

2.1 Introduction ......................................... 5

2.2 Safety Precautions ................................... 5

2.2.1 High Impedance Considerations .................... 5

2.2.2 Static Precautions .................................. 6

2.3 Connections and Cabling ............................. 6

2.4 Installation and Removal ............................. 8

2.5 Operation .......................................... 10

2.5.1 Scanner Control of the Channels ................... 11

2.52 Operation Notes .................................. 18

2.6 Applications. ....................................... 18

SECTION 3 - SERVICING INFORMATION

3.I

3.2

3.3

3.4

3.5

3.6

Introduction ........................................ 25

Handling and Cleaning ............................. 25

Relay Replacement .................................. 26

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

Offset Current Test ................................. W

Contact Resistance Test .............................. 29

SECTION 4 - REPLACEABLE PARTS

4.1

4.2

4.3

4.4

4.5

introduction ........................................ 33

Parts Lists ......................................... 33

Ordering Information ............................... 33

Factory Service ..................................... 35

Component Layout and Schematic Diagram ........... 35

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LIST OF TABLES

SECTION 2 - OPERATION

2-l

2-2

2-3

Example Channel Assignments in 2-P& Mode. 12

Example Channel Assignments in l-Pole Mode 13

Example Channel Assignments in Matrix (O-Pole)

Mode 14

2-4 Scanner Control of Model 7158 4-Pole Mode 15

2-5 Scanner Control of Model 7l58 2-Pole Mode 15

2-6 Scanner Control of Model 7l58 l-Pole Mode. 16

2-7 Scanner Control of Model 7158 Matrix (O-Pole) Mode. 17

SECTION 3 - SERVICING INFORMATION

3-l Recommended Test Equipment, 27

SECTION 4 - REPLACEABLE PARTS

4-l Model 7l58 Electrical Parts. 34

4-2 Model 7158 Mechanical Parts 35

iii/iv

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LIST OF ILLUSTRATIONS

SECTION 2 - OPERATION

2-l Multi-Card Connection. 7

2-2 Installing Card in Model 705, 9

2-3 Installing Card in Model 706.. 10

2-4 Model 7l58 Simplified Schematic, 11

2-5 Capacitor Leakage Schematic 20

2-6 Capacitor Leakage Instrument Setu x ““” ., 21

2-7 Measuring Leakages with One Car 23

SECTION 3 - SERVICING INFORMATION

3-l Offset Current 28

3-2 Coax Pigtail Preparation. 30

3-3 Contact Resistance 31

SECTION 4 - REPLACEABLE PARTS

4-l Model 7l58 Component Layout 36

4-2 Model 7l58 Schematic Diagram 37

v/vi

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