Keithley 2750 User Manual

Model 2750 Multimeter/Switch System

A GREATER MEASURE OF CONFIDENCE

User’s Manual

WARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a
period of 3 years 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 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.

Sales Offices: BELGIUM:

CHINA:

Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-82251886 • Fax: [phone]

FINLAND:
FRANCE:
GERMANY:
GREAT BRITAIN:
INDIA:

1/5, Eagles Street • Langford Town • Bangalore 560 025 • 080 212 80-27 • Fax: [phone]

ITALY:

Viale San Gimignano, 38 • 20146 Milano • 02-48 39 16 01 • Fax: [phone]

JAPAN:

New Pier Takeshiba North Tower 13F • 11-1, Kaigan 1-chome • Minato-ku, Tokyo 105-0022 • 81-3-5733-7555 • Fax: [phone]

KOREA:

2FL., URI Building • 2-14 Yangjae-Dong • Seocho-Gu, Seoul 137-888 • 82-2-574-7778 • Fax: [phone]

NETHERLANDS:
SWEDEN:
TAIWAN:

28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: [phone]

1-888-KEITHLEY (534-8453) • www.keithley.com

Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02-363 00 40 • Fax: [phone]

Halsuantie 2 • 00420 Helsinki, Finland • 09-53 06 65 60 • Fax: [phone]

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

Landsberger Strasse 65 • 82110 Germering • 089-84 93 07-40 • Fax: [phone]

Unit 2 Commerce Park, Brunel Road • Theale, Berkshire RG7 4AB • 0118 -929 75 00 • Fax: [phone]

Postbus 559 • 4200 AN Gorinchem • 0183-63 53 33 • Fax: [phone]

c/o Regus Business Centre • Frosundaviks Allé 15, 4tr • 16970 Solna • 08-50 90 46 00 • Fax: [phone]

13F-3, NO. 6, Lane 99, Pu-Ding Road, Hsinchu, Taiwan, ROC. • 886-3-572-9077• Fax: [phone]

5/03

Model 2750 Multimeter/Switch System

User’s Manual

©2001, Keithley Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

Fourth Printing, August 2003

Document Number: 2750-900-01 Rev. D

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 2750-900-01).............................................................. March 2001

Revision B (Document Number 2750-900-01) ........................................................November 2001

Revision C (Document Number 2750-900-01) ........................................................November 2002

Revision D (Document Number 2750-900-01).............................................................August 2003

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

S

afety 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 and follow all installation, operation, and maintenance information carefully before
using the product. Refer to the manual for complete product specifications.

If the product is used in a manner not specified, the protection provided by the product may be impaired.

The types of product users are:

Responsible body

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

Operators

instrument. They must be protected from electric shock and contact with hazardous live circuits.

Maintenance personnel

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

trained service personnel may perform installation and service procedures.

Keithley products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category
II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and
data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with
high transient over-voltages. Measurement Category II connections require protection for high transient over-voltages often
associated with local AC mains connections. Assume all measurement, control, and data I/O connections are for connection to
Category I sources unless otherwise marked or described in the Manual.

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

42.4V peak, or 60VDC are present.

circuit before measuring.

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

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

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

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

is the individual or group responsible for the use and maintenance of equipment, for ensuring that the equip-

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

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

are trained to work on live circuits, and perform safe installations and repairs of products. Only properly

A good safety practice is to expect that hazardous voltage is present in any unknown

no conductive part of the circuit may be exposed.

5/03

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.

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

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

When fuses are used in a product, replace with same type and rating for continued protection against fire hazard.

Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections.

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

If a 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 symbol indicates a connection terminal to the equipment frame.

The

WARNING

information very carefully before performing the indicated procedure.

The

CAUTION

warranty.

Instrumentation and accessories shall not be connected to humans.

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

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

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

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

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

Table of Contents

1 Getting Started

General information ................................................................... 1-2

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

Contact information ............................................................ 1-2

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

Inspection ............................................................................ 1-3

Options and accessories ...................................................... 1-3

Model 2750 features ................................................................... 1-6

Plug-in switching modules ......................................................... 1-7

Pseudocards ......................................................................... 1-9

Identifying installed switching modules ........................... 1-10

Front and rear panel familiarization ......................................... 1-10

Front panel summary ........................................................ 1-10

Rear panel summary ......................................................... 1-14

Rack mounting ......................................................................... 1-15

Power-up .................................................................................. 1-16

Line power connection ...................................................... 1-16

Line frequency .................................................................. 1-16

Setting line voltage and replacing fuse ............................. 1-17

Power-up sequence ........................................................... 1-18

Keyclick ............................................................................ 1-19

Display ..................................................................................... 1-19

Status and error messages ................................................. 1-19

Remote programming — display ...................................... 1-20

Defaults and user setups ........................................................... 1-21

Saving and restoring setups .............................................. 1-22

Remote programming — default and user setups ............. 1-26

Remote programming information ........................................... 1-27

Quick start exercises ................................................................. 1-28

Basic DMM measurements — front panel inputs ............. 1-28

Closing and opening channels — system channel

Simple scanning ................................................................ 1-34

Trigger and return readings — remote programming ....... 1-37

operation ......................................................................... 1-31

2 Closing and Opening Switching Module Channels

Close/open overview .................................................................. 2-2

Switching module installation and connections ......................... 2-3

Module installation ............................................................. 2-3

Connections ......................................................................... 2-4

Pseudocards ......................................................................... 2-5

Channel assignments .................................................................. 2-5

System channel operation ........................................................... 2-6

2-wire functions ................................................................... 2-7

4-wire functions (paired channels) ...................................... 2-8

Controlling the system channel ........................................... 2-9

Non-amp and non-measure switching modules ................ 2-14

Multiple channel operation ....................................................... 2-16

Controlling multiple channels ........................................... 2-17

Multiple channel operation anomalies .............................. 2-22

Dual independent multiplexers .......................................... 2-24

Identifying installed modules and viewing closed channels .... 2-29

CARD menu ...................................................................... 2-29

Switching module queries (remote operation) .................. 2-31

Relay closure count .................................................................. 2-32

Reading relay closure count .............................................. 2-33

Setting count update interval ............................................. 2-34

Model 7700 switching module ................................................. 2-34

Switching module capabilities .......................................... 2-34

Schematic diagram ............................................................ 2-36

3 Basic DMM Operation

DMM measurement capabilities ................................................. 3-2

High energy circuit safety precautions ....................................... 3-3

Performance considerations ........................................................ 3-4

Warm-up .............................................................................. 3-4

Autozero .............................................................................. 3-4

LSYNC (line cycle synchronization) .................................. 3-5

Remote programming — autozero and LSYNC ................. 3-6

Channel list parameter (<clist>) ................................................. 3-6

Voltage measurements (DCV and ACV) .................................... 3-7

DCV input divider ............................................................... 3-7

Connections ......................................................................... 3-8

Volts measurement procedure ........................................... 3-11

AC voltage measurements and crest factor ....................... 3-12

Low level considerations ................................................... 3-15

Current measurements (DCI and ACI) ..................................... 3-16

Connections ....................................................................... 3-16

Amps measurement procedure .......................................... 3-18

AMPS fuse replacement (front panel AMPS input) .......... 3-19

Resistance measurements (Ω2 and Ω4) ................................... 3-19

Connections ....................................................................... 3-20

Standard resistance measurements .................................... 3-23

Offset-compensated ohms ................................................. 3-24

Dry circuit ohms (DRYCKT) ............................................ 3-26

Measurement methods ...................................................... 3-28

4-wire common-side (CSID) ohms measurements

(7701 module) ................................................................ 3-34

Temperature measurements ...................................................... 3-35

Thermocouples .................................................................. 3-35

Thermistors ....................................................................... 3-38

4-wire RTDs ...................................................................... 3-38

Connections ....................................................................... 3-39

Temperature measurement configuration .......................... 3-44

Temperature measurement procedure ............................... 3-46

Frequency and period measurements ....................................... 3-47

Trigger level ...................................................................... 3-47

Gate time ........................................................................... 3-47

Connections ....................................................................... 3-48

Frequency and period measurement procedure ................ 3-49

Continuity testing ..................................................................... 3-50

Connections ....................................................................... 3-50

Continuity testing procedure ............................................. 3-51

Remote programming for basic measurements ........................ 3-52

Basic measurement commands ......................................... 3-52

Basic measurement programming examples .................... 3-58

Measurement queries ............................................................... 3-60

:FETCh? ............................................................................ 3-60

:READ? ............................................................................. 3-60

:MEASure[:<function>]? .................................................. 3-61

[:SENSe[1]]:DATA:FRESh? ............................................. 3-62

[:SENSe[1]]:DATA[:LATest]? .......................................... 3-62

Examples ........................................................................... 3-63

4 Range, Digits, Rate, Bandwidth, and Filter

Range ......................................................................................... 4-2

Measurement ranges and maximum readings ..................... 4-2

Manual ranging ................................................................... 4-3

Auto ranging ....................................................................... 4-3

Scanning .............................................................................. 4-3

Remote programming — range .......................................... 4-4

Digits .......................................................................................... 4-5

Scanning .............................................................................. 4-6

Remote programming — digits .......................................... 4-6

Rate and bandwidth .................................................................... 4-8

Rate ...................................................................................... 4-8

Bandwidth ......................................................................... 4-10

Scanning ............................................................................ 4-10

Remote programming — rate and bandwidth ................... 4-10

Filter ......................................................................................... 4-13

Filter characteristics ......................................................... 4-13

Remote programming — filter .......................................... 4-20

5 Relative, Math, Ratio, Channel Average, and dB

Relative ....................................................................................... 5-2

Basic operation .................................................................... 5-2

Remote programming — rel ............................................... 5-4

Math ............................................................................................ 5-7

mX+b ................................................................................... 5-8

Percent ................................................................................. 5-9

Reciprocal (1/X) ................................................................ 5-10

Basic operation .................................................................. 5-11

Remote programming — math .......................................... 5-12

Ratio and channel average ........................................................ 5-14

Basic operation .................................................................. 5-15

Remote programming — ratio and channel average ......... 5-17

dB ............................................................................................. 5-19

Remote programming — dB ............................................. 5-20

6 Buffer

Buffer overview .......................................................................... 6-2

Front panel buffer ....................................................................... 6-2

Auto clear ............................................................................ 6-2

Timestamps ......................................................................... 6-4

Storing readings ................................................................... 6-6

Recalling readings ............................................................... 6-6

Buffer statistics .................................................................... 6-8

Remote programming — buffer ................................................. 6-9

Buffer commands ................................................................ 6-9

Programming example ...................................................... 6-15

7 Scanning

Scanning fundamentals ............................................................... 7-2

Channel assignments ........................................................... 7-3

Sequential and non-sequential scans ................................... 7-3

Scan process ........................................................................ 7-3

Trigger models .................................................................... 7-4

Scan configuration .................................................................... 7-11

Scan reset .......................................................................... 7-13

Simple scan ....................................................................... 7-13

Advanced scan .................................................................. 7-14

Setting delay ...................................................................... 7-18

Monitor channel ................................................................ 7-18

Auto channel configuration ............................................... 7-20

Saving setup ...................................................................... 7-21

Auto scan .......................................................................... 7-21

Scan operation .......................................................................... 7-22

Basic scan .......................................................................... 7-22

Manual/external trigger scan ............................................. 7-23

Monitor scan (analog trigger) ........................................... 7-24

Remote programming — scanning .......................................... 7-26

Trigger model .................................................................... 7-26

Channel setup .................................................................... 7-27

Buffer ................................................................................ 7-27

Scanning commands ......................................................... 7-27

Scanning programming example ...................................... 7-32

Scanning examples ................................................................... 7-33

External trigger scan ......................................................... 7-33

Monitor scan ..................................................................... 7-36

8 Triggering

Trigger model ............................................................................. 8-2

Idle ...................................................................................... 8-2

Control source and event detection ..................................... 8-3

Delay (auto or manual) ....................................................... 8-3

Device action ....................................................................... 8-5

Output trigger ...................................................................... 8-5

External triggering ..................................................................... 8-6

Digital I/O ........................................................................... 8-6

External trigger ................................................................... 8-7

Voltmeter complete ............................................................. 8-7

External triggering example ................................................ 8-8

External triggering with BNC connections ....................... 8-11

Remote programming — triggering ......................................... 8-12

Trigger model (remote operation) ..................................... 8-12

Trigger model operation .................................................... 8-14

Triggering commands ....................................................... 8-15

Programming example ...................................................... 8-16

9 Limits and Digital I/O

Limits .......................................................................................... 9-2

Scanning .............................................................................. 9-4

Basic limits operation .......................................................... 9-4

Digital I/O ................................................................................... 9-5

Digital input (trigger link input) .......................................... 9-5

Digital outputs ..................................................................... 9-6

Setting digital output ......................................................... 9-10

Scanning ............................................................................ 9-12

Remote programing — limits and digital output ...................... 9-12

Limits and digital output commands ................................. 9-12

Limits and digital outputs programming example ............ 9-14

Application — sorting resistors ................................................ 9-15

Limits ................................................................................ 9-15

Digital outputs ................................................................... 9-17

10 Remote Operations

Operation enhancements .......................................................... 10-2

Pseudocards ....................................................................... 10-2

Autozero ............................................................................ 10-2

dB calculation .................................................................... 10-2

Separate function setups .................................................... 10-2

DCV input divider ............................................................. 10-3

Multiple channel operation ................................................ 10-3

GPIB setup ................................................................................ 10-3

GPIB standards .................................................................. 10-3

Selecting GPIB and setting primary address ..................... 10-4

GPIB connections .............................................................. 10-4

General bus commands ............................................................. 10-7

REN (remote enable) ......................................................... 10-7

IFC (interface clear) .......................................................... 10-7

LLO (local lockout) ........................................................... 10-8

GTL (go to local) ............................................................... 10-8

DCL (device clear) ............................................................ 10-8

SDC (selective device clear) .............................................. 10-8

GET (group execute trigger) ............................................. 10-8

SPE, SPD (serial polling) .................................................. 10-9

Front panel GPIB operation ...................................................... 10-9

Error and status messages ................................................. 10-9

GPIB status indicators ....................................................... 10-9

LOCAL key ..................................................................... 10-10

Programming syntax .............................................................. 10-10

Command words ............................................................. 10-10

Query commands ............................................................ 10-12

Case sensitivity ............................................................... 10-12

Long-form and short-form versions ................................ 10-13

Short-form rules .............................................................. 10-13

Program messages ........................................................... 10-14

Response messages ......................................................... 10-16

Message exchange protocol ............................................ 10-16

RS-232 interface operation .................................................... 10-17

Sending and receiving data ............................................. 10-17

Baud rate ......................................................................... 10-17

Signal handshaking (flow control) .................................. 10-18

Terminator ....................................................................... 10-18

Selecting and configuring RS-232 interface ................... 10-19

RS-232 connections ........................................................ 10-19

Error messages ................................................................ 10-20

11 Status Structure

Overview .................................................................................. 11-2

Status byte and SRQ ......................................................... 11-2

Status register sets ............................................................. 11-2

Queues ............................................................................... 11-2

Clearing registers and queues ................................................... 11-4

Programming and reading registers ......................................... 11-5

Programming enable registers ........................................... 11-5

Reading registers ............................................................... 11-6

Status byte and service request (SRQ) ..................................... 11-6

Status byte register ............................................................ 11-7

Service request enable register .......................................... 11-7

Serial polling and SRQ ..................................................... 11-8

Status byte and service request commands ....................... 11-8

Serial poll programming example ..................................... 11-9

Status register sets .................................................................. 11-11

Register bit descriptions .................................................. 11-11

Condition registers .......................................................... 11-18

Event registers ................................................................. 11-18

Event enable registers ..................................................... 11-19

Queues .................................................................................... 11-22

Output queue ................................................................... 11-22

Error queue ...................................................................... 11-22

12 Common Commands

13 SCPI Signal Oriented Measurement Commands

CONFigure:<function> [<rang>], [<res>], [<clist>] .............. 13-4

FETCh? ..................................................................................... 13-6

READ? ..................................................................................... 13-7

MEASure:<function>? [<rang>], [<res>], [<clist>] ............... 13-8

14 FORMat and Miscellaneous SYSTem Commands

FORMat commands .................................................................. 14-2

FORMat[:DATA] <type>[,<length>] ............................... 14-2

FORMat:ELEMents <item list> ....................................... 14-6

FORMat:BORDer <name> .............................................. 14-7

Miscellaneous SYSTem commands ......................................... 14-8

SYSTem:PRESet ............................................................... 14-8

SYSTem:VERSion ............................................................ 14-8

SYSTem:KEY <NRf> ...................................................... 14-8

SYSTem:BEEPer[:STATe] <b> ....................................... 14-9

15 SCPI Reference Tables

Reference tables ........................................................................ 15-2

A Specifications

Accuracy calculations ................................................................ A-7

Calculating DC characteristics accuracy ............................ A-7

Calculating AC characteristics accuracy ............................ A-7

Calculating dBm characteristics accuracy .......................... A-8

Calculating dB characteristics accuracy ............................. A-8

Additional derating factors ................................................. A-9

Optimizing measurement accuracy ........................................... A-9

DC voltage, DC current, and resistance: ............................ A-9

AC voltage and AC current: ............................................... A-9

Temperature: ....................................................................... A-9

Optimizing measurement speed .............................................. A-10

DC voltage, DC current, and resistance: .......................... A-10

AC voltage and AC current: ............................................. A-10

Temperature: ..................................................................... A-10

B Model 7700 Connection Guide

Card configuration — schematic ............................................... B-2

Connections and wiring ............................................................ B-4

Screw terminals .................................................................. B-4

Wiring procedure ............................................................... B-6

Typical connections ........................................................... B-8

Connection log ................................................................. B-10

C Status and Error Messages

D Signal Processing Sequence and Data Flow

Signal processing sequence ....................................................... D-2

Basic signal processing ...................................................... D-2

Signal processing using instrument features ...................... D-3

Signal processing using Ratio or Ch Avg .......................... D-6

Data flow (remote operation) .................................................... D-7

SENSe and sample buffer .................................................. D-8

[SENS[1]]:DATA[LATest]? ............................................... D-9

[SENS[1]]:DATA:FRESh? ................................................. D-9

FETCh? ............................................................................ D-10

READ? ............................................................................. D-10

MEASure? ........................................................................ D-10

CALC[1]:DATA[LATest]? ............................................... D-10

CALC[1]:DATA:FRESh? ................................................ D-10

CALC3:LIM1:FAIL? ....................................................... D-11

CALC3:LIM2:FAIL? ....................................................... D-11

TRACe:DATA? ................................................................ D-11

CALC2:IMM? .................................................................. D-12

CALC2:IMM ................................................................... D-12

CALC2:DATA? ................................................................ D-12

Continuous measurement mode ....................................... D-12

Scanning ........................................................................... D-13

E Measurement Considerations

Measurement considerations ..................................................... E-2

Thermoelectric potentials ................................................... E-2

Thermoelectric generation .................................................. E-3

Minimizing thermal EMFs ................................................. E-4

Source resistance noise ....................................................... E-5

Magnetic fields ................................................................... E-6

Radio frequency interference ............................................. E-6

Ground loops ...................................................................... E-6

Shielding ............................................................................. E-8

Meter loading ..................................................................... E-9

F Temperature Equations

Thermocouple equation ............................................................. F-2

Thermistor equation ................................................................... F-6

RTD equations ........................................................................... F-8

G IEEE-488 Bus Overview

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

Bus description .......................................................................... G-2

Bus lines .................................................................................... G-4

Data lines ............................................................................ G-4

Bus management lines ........................................................ G-4

Handshake lines .................................................................. G-5

Bus commands ........................................................................... G-6

Uniline commands .............................................................. G-8

Universal multiline commands ........................................... G-8

Addressed multiline commands ......................................... G-9

Address commands ............................................................ G-9

Unaddress commands ......................................................... G-9

Common commands ......................................................... G-10

SCPI commands ............................................................... G-10

Command codes ............................................................... G-10

Typical command sequences ............................................ G-12

IEEE command groups ..................................................... G-13

Interface function codes .......................................................... G-14

H KE2700 Instrument Driver Examples

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

Visual Basic and CVI (C) examples .......................................... H-2

LabVIEW examples ................................................................ H-12

List of Illustrations

1 Getting Started

Figure 1-1 Model 2750 front panel ........................................................ 1-10

Figure 1-2 Model 2750 rear panel ......................................................... 1-14

Figure 1-3 Rack preparation .................................................................. 1-15

Figure 1-4 Power module ...................................................................... 1-17

Figure 1-5 Connection to DMM for 2-wire function

(system channel 101 closed) ............................................ 1-31

Figure 1-6 Connection to DMM for 4-wire function

(system channel 106 closed) ............................................ 1-32

Figure 1-7 Front panel keys to close and open system channels ........... 1-33

Figure 1-8 Simple scan operation .......................................................... 1-35

Figure 1-9 Exercise 4 — Trigger and return a single reading ............... 1-38

Figure 1-10 Exercise 5 — Trigger and return multiple readings ............. 1-39

Figure 1-11 Exercise 6 — Return a single reading

(continuous triggering) .................................................... 1-40

2 Closing and Opening Switching Module Channels

Figure 2-1 2-wire system channel connections to Model 2750 DMM .... 2-7

Figure 2-2 4-wire system channel connections to Model 2750 DMM .... 2-8

Figure 2-3 System channel operation — closing next or previous

measurement channel ........................................................ 2-9

Figure 2-4 System channel operation — specifying measurement

channel to close ............................................................... 2-10

Figure 2-5 System channel operation — opening all channels

in mainframe .................................................................... 2-11

Figure 2-6 Multiple channel operation — specifying a channel

to close ............................................................................. 2-18

Figure 2-7 Multiple channel operation — opening one or all

channels ........................................................................... 2-19

Figure 2-8 Dual multiplexer configuration (Model 7700) ..................... 2-24

Figure 2-9 Dual multiplexer application connections ........................... 2-26

Figure 2-10 Testing DUT 1 ..................................................................... 2-27

Figure 2-11 CARD menu tree ................................................................. 2-31

Figure 2-12 Model 7700 simplified schematic ........................................ 2-37

3 Basic DMM Operation

Figure 3-1 Line cycle synchronization .................................................... 3-5

Figure 3-2 DCV and ACV connections using front panel inputs ............ 3-9

Figure 3-3 DCV and ACV connections using Model 7700 switching

module ............................................................................. 3-10

Figure 3-4 ACV measurements – sine waves ........................................ 3-13

Figure 3-5 ACV measurements – square, pulse, and sawtooth waves ... 3-14

Figure 3-6 DCI and ACI connections using front panel inputs .............. 3-17

Figure 3-7 DCI and ACI connections using Model 7700 switching

module ............................................................................. 3-17

Figure 3-8
Figure 3-9

Figure 3-10 Constant-current method to measure ohms

Figure 3-11 Ratiometric method to measure ohms

Figure 3-12 Open ohms test lead detection .............................................. 3-33

Figure 3-13 Open Sense Lo lead detection (10MΩ and

Figure 3-14 Thermocouple connections .................................................. 3-40

Figure 3-15 Thermistor connections ........................................................ 3-42

Figure 3-16 4-wire RTD connections ...................................................... 3-43

Figure 3-17 FREQ and PERIOD connections for front panel inputs ...... 3-48

Figure 3-18 FREQ and PERIOD connections using Model 7700

Figure 3-19 Continuity connections ......................................................... 3-51

Ω

2 and Ω4 connections for front panel inputs ..................... 3-21

Ω

2 and Ω4 connections for Model 7700 switching

module ............................................................................. 3-22

(1Ω to 1MΩ ranges) ......................................................... 3-29

(10MΩ and 100MΩ ranges) ............................................ 3-31

100MΩ ranges) ................................................................ 3-34

switching module ............................................................. 3-49

4 Range, Digits, Rate, Bandwidth, and Filter

Figure 4-1 Speed vs. noise characteristics ............................................... 4-8

Figure 4-2 Moving and repeating filters ................................................ 4-15

Figure 4-3 Filter window ....................................................................... 4-17

Figure 4-4 Filter configuration flow chart .............................................. 4-19

5 Relative, Math, Ratio, Channel Average, and dB

Figure 5-1 MATH menu tree .................................................................... 5-7

6 Buffer

Figure 6-1 Recalling buffer data — relative timestamp ........................... 6-7

Figure 6-2 Recalling buffer data — real-time clock timestamp .............. 6-7

7 Scanning

Figure 7-1 Trigger model with STEP function ........................................ 7-5

Figure 7-2 Trigger model with SCAN function ....................................... 7-6

Figure 7-3 Scan configuration flowchart ................................................ 7-11

Figure 7-4 External trigger scan example .............................................. 7-34

Figure 7-5 Monitor scan example .......................................................... 7-37

8 Triggering

Figure 8-1 Front panel trigger model (without scanning) ....................... 8-2

Figure 8-2 Device action ......................................................................... 8-5

Figure 8-3 TRIG LINK pinout ................................................................ 8-6

Figure 8-4 Trigger link input pulse specifications (EXT TRIG) ............. 8-7

Figure 8-5 Trigger link output pulse specifications (VMC) .................... 8-7

Figure 8-6 DUT test system .................................................................... 8-8

Figure 8-7 Trigger link connections ........................................................ 8-9

Figure 8-8 Operation model for triggering example ............................. 8-10

Figure 8-9 DIN to BNC trigger cable .................................................... 8-11

Figure 8-10 Trigger model (remote operation) ........................................ 8-13

9 Limits and Digital I/O

Figure 9-1 Default limits ......................................................................... 9-2

Figure 9-2 Digital I/O port ...................................................................... 9-5

Figure 9-3 Digital I/O port simplified schematic ..................................... 9-6

Figure 9-4 Controlling externally powered relays ................................... 9-9

Figure 9-5 NAND gate control .............................................................. 9-10

Figure 9-6 Setup to test 100Ω resistors ................................................. 9-15

Figure 9-7 Limits to sort 100Ω resistors (1%, 5%, and >5%) ............... 9-16

10 Remote Operations

Figure 10-1 IEEE-488 connector ............................................................. 10-4

Figure 10-2 IEEE-488 connections ......................................................... 10-5

Figure 10-3 IEEE-488 connector location ............................................... 10-6

Figure 10-4 RS-232 interface connector ............................................... 10-19

11 Status Structure

Figure 11-1 Model 2750 status register structure .................................... 11-3

Figure 11-2 16-bit status register ............................................................. 11-5

Figure 11-3 Status byte and service request (SRQ) ................................. 11-6

Figure 11-4 Standard event status .......................................................... 11-11

Figure 11-5 Operation event status ........................................................ 11-13

Figure 11-6 Measurement event status .................................................. 11-15

Figure 11-7 Questionable event status ................................................... 11-17

14 FORMat and Miscellaneous SYSTem Commands

Figure 14-1 ASCII data format ................................................................ 14-3

Figure 14-2 IEEE-754 data formats ......................................................... 14-5

Figure 14-3 Key-press codes ................................................................... 14-9

B Model 7700 Connection Guide

Figure B-1 Simplified schematic for Model 7700 ................................... B-3

Figure B-2 Screw terminal access ........................................................... B-5

Figure B-3 Model 7700 screw terminal channel designations ................ B-5

Figure B-4 Wire dressing ......................................................................... B-7

Figure B-5 Thermocouple connections ................................................... B-8

Figure B-6
Figure B-7

Figure B-8 Current connections (AC or DC) ........................................... B-9

Figure B-9 Voltage connections (DC or AC) ......................................... B-10

Ω

2-Wire and thermistor connections .................................... B-8

Ω

4-Wire and RTD connections ............................................. B-9

D Signal Processing Sequence and Data Flow

Figure D-1 Basic signal processing ......................................................... D-2

Figure D-2 Signal processing using instrument features ......................... D-3

Figure D-3 Signal processing using Ratio or Channel Average .............. D-6

Figure D-4 Data flow for remote operation ............................................. D-7

E Measurement Considerations

Figure E-1 Thermal EMF generation ...................................................... E-3

Figure E-2 Power line ground loops ........................................................ E-7

Figure E-3 Eliminating ground loops ...................................................... E-7

Figure E-4 Shielding example ................................................................. E-8

Figure E-5 Meter loading ........................................................................ E-9

G IEEE-488 Bus Overview

Figure G-1 IEEE-488 bus configuration .................................................. G-3

Figure G-2 IEEE-488 handshake sequence ............................................. G-5

Figure G-3 Command codes .................................................................. G-11

List of Tables

1 Getting Started

Table 1-1 Model 77xx series switching modules ................................... 1-8

Table 1-2 Fuse ratings .......................................................................... 1-18

Table 1-3 Display commands ............................................................... 1-20

Table 1-4 Default settings .................................................................... 1-23

Table 1-5 Default setup commands ...................................................... 1-26

Table 1-6 Exercise 1 — Measure AC volts - store readings in buffer .. 1-30
Table 1-7 Exercise 2 — Close and open channels (system channel

Table 1-8 Exercise 3 — Simple scanning ............................................ 1-36

2 Closing and Opening Switching Module Channels

Table 2-1 System channel control commands ...................................... 2-12

Table 2-2 Multiple channel control commands .................................... 2-20

Table 2-3 Relay closure count commands ........................................... 2-33

3 Basic DMM Operation

Table 3-1 Autozero and LSYNC commands ......................................... 3-6

Table 3-2 Color codes — thermocouple wires ..................................... 3-41

Table 3-3 Thermocouple temperature measurement configuration ..... 3-44

Table 3-4 Thermistor temperature measurement configuration ........... 3-45

Table 3-5 RTD parameters ................................................................... 3-45

Table 3-6 4-wire RTD temperature measurement configuration ......... 3-46

Table 3-7 Basic measurement commands ............................................ 3-52

operation) ......................................................................... 1-34

4 Range, Digits, Rate, Bandwidth, and Filter

Table 4-1 Measurement ranges and maximum readings ........................ 4-2

Table 4-2 Range commands ................................................................... 4-4

Table 4-3 Digits commands ................................................................... 4-6

Table 4-4 Rate and bandwidth settings .................................................. 4-9

Table 4-5 Rate and bandwidth commands ........................................... 4-11

Table 4-6 Filter commands .................................................................. 4-20

5 Relative, Math, Ratio, Channel Average, and dB

Table 5-1 Rel commands ....................................................................... 5-4

Table 5-2 Math commands ................................................................... 5-12

Table 5-3 Ratio and channel average commands ................................. 5-17

Table 5-4 dB commands ...................................................................... 5-20

6 Buffer

Table 6-1 Buffer commands ................................................................... 6-9

7 Scanning

Table 7-1 Scanning commands ............................................................. 7-28

Table 7-2 External trigger scan example .............................................. 7-35

Table 7-3 Monitor scan example .......................................................... 7-38

8 Triggering

Table 8-1 Auto delay settings ................................................................. 8-4

Table 8-2 SCPI commands — triggering ............................................. 8-15

9 Limits and Digital I/O

Table 9-1 OUTPUT menu .................................................................... 9-11

Table 9-2 Limits and digital I/O commands ......................................... 9-12

10 Remote Operations

Table 10-1 General bus commands ........................................................ 10-7

Table 10-2 RS-232 connector pinout .................................................... 10-20

Table 10-3 PC serial port pinout ........................................................... 10-20

11 Status Structure

Table 11-1 Common and SCPI commands to reset registers and

clear queues ...................................................................... 11-4

Table 11-2 Status byte and service request enable register commands .. 11-9

Table 11-3 Condition register commands ............................................. 11-18

Table 11-4 Event register commands ................................................... 11-18

Table 11-5 Event enable registers commands ...................................... 11-19

Table 11-6 Error queue commands ...................................................... 11-23

12 Common Commands

Table 12-1 IEEE-488.2 common commands and queries ...................... 12-2

13 SCPI Signal Oriented Measurement Commands

Table 13-1 Signal oriented measurement command summary .............. 13-2

14 FORMat and Miscellaneous SYSTem Commands

Table 14-1 SCPI commands — data format ........................................... 14-2

15 SCPI Reference Tables

Table 15-1 CALCulate command summary .......................................... 15-3

Table 15-2 DISPlay command summary ............................................... 15-6

Table 15-3 FORMat command summary ............................................... 15-6

Table 15-4 ROUTe command summary ................................................. 15-7

Table 15-5 SENSe command summary ................................................. 15-8

Table 15-6 STATus command summary .............................................. 15-19

Table 15-7 SYSTem command summary ............................................ 15-20

Table 15-8 TRACe command summary .............................................. 15-24

Table 15-9 Trigger command summary ............................................... 15-25

Table 15-10 UNIT command summary ................................................. 15-26

B Model 7700 Connection Guide

Table B-1 Connection log Model 7700 ............................................... B-11

C Status and Error Messages

Table C-1 Status and error messages ..................................................... C-2

E Measurement Considerations

Table E-1 Material thermoelectric coefficients ...................................... E-2

F Temperature Equations

Table F-1 Type B inverse function polynomial ...................................... F-2

Table F-2 Type E inverse function polynomial ...................................... F-3

Table F-3 Type J inverse function polynomial ....................................... F-3

Table F-4 Type K inverse function polynomial ...................................... F-4

Table F-5 Type N inverse function polynomial ...................................... F-4

Table F-6 Type R inverse function polynomial ...................................... F-5

Table F-7 Type S inverse function polynomial ...................................... F-5

Table F-8 Type T inverse function polynomial ...................................... F-6

Table F-9 Model 2750 curve fitting constants for thermistors ............... F-6

Table F-10 RTD parameters ..................................................................... F-8

G IEEE-488 Bus Overview

Table G-1 IEEE-488 bus command summary ........................................ G-7

Table G-2 Hexadecimal and decimal command codes ........................ G-10

Table G-3 Typical addressed command sequence ................................ G-12

Table G-4 Typical addressed command sequence ................................ G-12

Table G-5 IEEE command groups ....................................................... G-13

Table G-6 Model 2750 interface function codes .................................. G-14

H KE2700 Instrument Driver Examples

Table H-1 Visual Basic and CVI (C) examples ...................................... H-3

Table H-2 LabVIEW examples ............................................................ H-12

1

Getting Started

Quick Start

acquaint yourself with fundamental instrument operations. Use
yourself with front panel controls, use

QS3

QS1 •

QS2 •

— Of the following section topics, three can be used immediately to quickly

QS1

to familiarize

QS2

to power-up the instrument, and, finally, use

to perform exercises to operate the instrument.

•

General information

information, contact information, safety symbols and terms, inspection, and
available options and accessories.

•

Model 2750 features

•

Plug-in switching modules

Model 77XX series switching modules.

Front and rear panel familiarization

of the instrument.

•

Rack mounting

in a standard 19-inch rack.

Power-up

power line frequency, and the power-up sequence.

•

Display

•

Defaults and user setups

covers the three setup configurations available to the user.

— Covers line power connection, line voltage setting, fuse replacement,

— Provides information about the display of the Model 2750.

— Covers general information that includes warranty

— Summarizes the features of Model 2750.

— Summarizes the capabilities of the Keithley

— Summarizes the controls and connectors

— Covers the options available for rack mounting the Model 2750

— Lists the *RST and factory default settings, and

QS3 •

•

Remote programming information

presented in this manual.

Quick start exercises

(front panel and remote programming) to acquaint a user with operation basics.

— Provides abbreviated operating information and exercises

— Explains how SCPI commands are

1-2 Getting Started Model 2750 Multimeter/Switch System User’s Manual

General information

Warranty information

Warranty information is located at the front of this manual. Should your Model 2750
require warranty service, contact the Keithley representative or authorized repair facility in
your area for further information. When returning the instrument for repair, be sure to fill
out and include the service form at the back of this manual to provide the repair facility
with the necessary information.

NOTE

The service form requires the serial number of the Model 2750. The serial

number is located on the rear panel. It can also be read from the front panel by

selecting the SNUM item of the SETUP menu. Press SHIFT and then SETUP to

access the menu. For remote operation, the serial number can be read using the

*IDN? command (see Section 12 for details).

Contact information

Worldwide phone numbers are listed at the front of this manual. If you have any questions,
please contact your local Keithley representative or call a Keithley Application Engineer at
1-800-348-3735 (U.S. and Canada only).

Safety symbols and terms

The following symbols and terms may be found on the instrument or used in this manual:

!

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

The symbol on the 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

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

heading used in this manual explains dangers that might result in

The

CAUTION

instrument. Such damage may invalidate the warranty.

heading used in this manual explains hazards that could damage the

Model 2750 Multimeter/Switch System User’s Manual Getting Started 1-3

Inspection

Model 2750 was carefully inspected electrically and mechanically before shipment. After
unpacking all items from the shipping carton, check for any obvious signs of physical
damage that may have occurred during transit. (There may be a protective film over the
display lens, which can be removed). Report any damage to the shipping agent
immediately. Save the original packing carton for possible future shipment. The following
items are included with every Model 2750 order:

• Model 2750 with line cord.

• Safety test leads (Model 1751).

• Accessories as ordered.

• Hardware for rack mounting.

• Certificate of calibration.

• Model 2750 User’s Manual (P/N 2750-900-00).

• Manual Addenda (pertains to any improvements or changes concerning the
instrument or manual).

• Software CD containing the following:

• TestPoint Runtime – Provides basic data logging capabilities. This can be
modified with the TestPoint application development package (optional
software).

• KE2700 IVI Instrument Driver – Provided for programmers, designed for use
with application development environments.

Optional “Software” available from Keithley is summarized on page 1-6.

If an additional manual is required, order the appropriate manual package. The manual
packages include a manual and any pertinent addenda.

Options and accessories

Plug-in switching modules

NOTE Table 1-1 provides a side-by-side comparison of the following Keithley

switching modules. All multiplexer modules can be configured as two
independent multiplexers.

NOTE The Model 77XX Series Switching Modules Instruction Manual provides

operating and service information for the switching modules. This manual is
supplied with each switching module.

Model 7700 — This differential multiplexer provides 20 channels of 2-pole input, or 10
channels of 4-pole input. The internal cold junction allows direct-connection of
thermocouples. It also has two 2-pole channels used exclusively for current input.

1-4 Getting Started Model 2750 Multimeter/Switch System User’s Manual

Model 7701 — This differential multiplexer provides 32 channels of 2-pole input, or
16 channels of 4-pole input.

Model 7702 — This differential multiplexer provides 40 channels of 2-pole input, or
20 channels of 4-pole input. It also has two 2-pole channels used exclusively for current
input.

Model 7703 — This differential multiplexer provides 32 channels of 2-pole input, or
16 channels of 4-pole input.

Model 7705 — This control module provides 40 independent 1-pole switching (SPST)
channels that are isolated from the internal DMM.

Model 7706 — This all-in-one module provides 20/10 channels of 2/4-pole input,
16 digital outputs, two analog outputs, one 32-bit counter with gating and totalizer.

Model 7707 — This module provides 10 channels of 2-pole input, or 5 channels of 4-pole
input. Also provides 32 digital inputs/outputs.

Model 7708 — This differential multiplexer provides 40 channels of 2-pole input, or 20
channels of 4-pole input. The internal cold junction allows direct-connection of
thermocouples for temperature measurements.

Model 7709 — This module is configured as a 6 × 8 matrix (six rows, eight columns). The
matrix consists of 48 crosspoint channels and two backplane isolation channels. For
system channel operation, row 1 is connected to DMM Input. For 4-wire measurements,
row 2 is connected to DMM Sense.

Model 7710 — This differential multiplexer provides 20 channels of 2-pole input or
10 channels of 4-pole input. The internal cold junction allows direct-connection of
thermocouples for temperature measurements. This module provides high-speed
switching and uses long-life relays.

Model 7711 — The Model 7711 is a 50Ω, 2GHz, single-pole dual 1 × 4 RF Multiplexer
module (eight channels, no measurement capability). This 1 × 4 multiplexer is a cascading
tree design — one of the channels of each is always connected to a common out. It can be
used to connect one instrument to multiple devices or multiple instruments to a single
device.

Model 7712 — The Model 7712 is a 50Ω, 3.5GHz, single-pole dual 1 × 4 RF Multiplexer
module (eight channels, no measurement capability). This 1 × 4 multiplexer is a cascading
tree design — one of the channels of each is always connected to a common out. It can be
used to connect one instrument to multiple devices or multiple instruments to a single
device.

Model 2750 Multimeter/Switch System User’s Manual Getting Started 1-5

Cables and connector kits for switching modules

Model 7788 DB-50 connector kit — Contains two male DB-50 solder cup connectors
with strain relief connector shells. These connectors mate to the female connectors of the
Models 7703 and 7705 switching modules.

Model 7789 50/25-pin solder cup connector kit — Contains one male DB-50 and one
male DB-25 solder cup connectors. These connectors mate to the female connectors on the
Models 7701 and 7709 switching modules.

Model 7790 ribbon cable adapter kit — Contains one female DB-50, one male DB-50
and one male DB-25 IDC ribbon cable connectors. These connectors are used with the
Models 7701, 7707 and 7709 switching modules.

Model 7051-X — BNC cable (male to male). 7051-2 is 2 ft long, 7051-5 is 5 ft long, and
7051-10 is 10 ft long. These cable are used with the Model 7711 switching module.

Model 7712-SMA-1 — SMA cable (male to male), 1.0m (3.3 ft) long. This cable is used
with the Models 7711 and 7712 switching modules.

Model 7712-SMA-N — Female SMA to male N-type adapter. This adapter is used with
the Models 7711 and 7712 switching modules.

S46-SMA-X — SMA cable (male to male). S46-SMA-1 is one foot long and
S46-SMA-0.5 is one-half foot long. This cable is used with the Models 7711 and 7712
switching modules.

Cables and adapters (GPIB and trigger link)

Models 7007-1 and 7007-2 shielded GPIB cables — Connect Model 2750 to the GPIB
bus using shielded cables and connectors to reduce electromagnetic interference (EMI).
Model 7007-1 is one meter long; Model 7007-2 is two meters long.

Models 8501-1 and 8501-2 trigger link cables — Connect Model 2750 to other
instruments with Trigger Link connectors (e.g., Model 7002 Switch System).
Model 8501-1 is one meter long; Model 8501-2 is two meters long.

Model 8502 trigger link adapter — Lets you connect any of the six trigger link lines of
Model 2750 to instruments that use the standard BNC trigger connectors.

Model 8503 DIN to BNC trigger cable — Lets you connect trigger link lines one
(Voltmeter Complete) and two (External Trigger) of Model 2750 to instruments that use
BNC trigger connectors. Model 8503 is one meter long.

1-6 Getting Started Model 2750 Multimeter/Switch System User’s Manual

Software

The following optional software is available from Keithley:

ExceLINX-1A – This is an economical, easy-to-use, add-in utility for Microsoft Excel ®
and Keithley Integra Series Multimeter/Switch systems. No programming is required —
configure your measurements quickly using pop-up menus and eliminate time-consuming
and error prone programming. Acquire data into a spreadsheet on the fly during a scan or
transfer data into a spreadsheet after a scan is completed. A few mouse clicks are all it
takes to configure channels, set parameters, triggers, and scan lists. There is no need to
launch a separate data logging or data-crunching application; live data streams
automatically into an Excel workbook, ready for analysis or charting using all of Excel's
powerful built-in tools.

TestPoint application development package — This powerful and economical
programming environment uses object-oriented technology through a drag-and-drop
interface to build a basic system quickly and without in-depth programming. Optional
toolkits (database and statistical process control) are available to expand ExceLINX-1A
capability.

Rack mount kit

Model 4288-7 rack mount kit — Mounts a Model 2750 in a standard 19-inch rack.
Includes rear brackets to provide additional support for a mainframe that has two or more
switching modules installed.

NOTE The Model 2750 includes hardware that allows it to be mounted to the front rails

of a standard 19-inch rack. With two or more switching modules installed, rear
support brackets may be required. The Model 4288-7 rack mount kit includes
rear support brackets.

Model 2750 features

Model 2750 is a 6½-digit high-performance multimeter/data acquisition system. It can
measure voltage (DC and AC), current (DC and AC), resistance (2- and 4-wire),
temperature (thermocouple, thermistor, and 4-wire RTD), frequency and period, and test
continuity.

The Model 2750 has five slots that will accommodate Keithley Model 7700 series
switching modules (Table 1-1). Each channel of a switching module that is closed or
scanned is measured by the Model 2750. For scanning, each channel can have its own
unique setup (i.e., function, range, digits, etc.).