Tektronix EXP-800/1600 Users Guide

EXP-800/1600

User’s Guide

A GREATER MEASURE OF CONFIDENCE

WARRANTY

Hardware

Keithley Instruments, Inc. warrants that, for a period of one (1) year from the date of shipment (3 years for Models 2000,
2001, 2002, 2010 and 2700), the Keithley Hardware product will be free from defects in materials or workmanship. This
warranty will be honored provided the defect has not been caused by use of the Keithley Hardware not in accordance with
the instructions for the product. This warranty shall be null and void upon: (1) any modification of Keithley Hardware that
is made by other than Keithley and not approved in writing by Keithley or (2) operation of the Keithley Hardware outside
of the environmental specifications therefore.

Upon receiving notification of a defect in the Keithley Hardware during the warranty period, Keithley will, at its option,
either repair or replace such Keithley Hardware. During the first ninety days of the warranty period, Keithley will, at its
option, supply the necessary on site labor to return the product to the condition prior to the notification of a defect. Failure
to notify Keithley of a defect during the warranty shall relieve Keithley of its obligations and liabilities under this
warranty.

Other Hardware

The portion of the product that is not manufactured by Keithley (Other Hardware) shall not be covered by this warranty,
and Keithley shall have no duty of obligation to enforce any manufacturers' warranties on behalf of the customer. On those
other manufacturers’ products that Keithley purchases for resale, Keithley shall have no duty of obligation to enforce any
manufacturers’ warranties on behalf of the customer.

Software

Keithley warrants that for a period of one (1) year from date of shipment, the Keithley produced portion of the software or
firmware (Keithley Software) will conform in all material respects with the published specifications provided such Keithley
Software is used on the product for which it is intended and otherwise in accordance with the instructions therefore.
Keithley does not warrant that operation of the Keithley Software will be uninterrupted or error-free and/or that the Keithley
Software will be adequate for the customer's intended application and/or use. This warranty shall be null and void upon any
modification of the Keithley Software that is made by other than Keithley and not approved in writing by Keithley.

If Keithley receives notification of a Keithley Software nonconformity that is covered by this warranty during the warranty
period, Keithley will review the conditions described in such notice. Such notice must state the published specification(s)
to which the Keithley Software fails to conform and the manner in which the Keithley Software fails to conform to such
published specification(s) with sufficient specificity to permit Keithley to correct such nonconformity. If Keithley deter­mines that the Keithley Software does not conform with the published specifications, Keithley will, at its option, provide
either the programming services necessary to correct such nonconformity or develop a program change to bypass such
nonconformity in the Keithley Software. Failure to notify Keithley of a nonconformity during the warranty shall relieve
Keithley of its obligations and liabilities under this warranty.

Other Software

OEM software that is not produced by Keithley (Other Software) shall not be covered by this warranty, and Keithley shall
have no duty or obligation to enforce any OEM's warranties on behalf of the customer.

Other Items

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

Items not Covered under Warranty

This warranty does not apply to fuses, non-rechargeable batteries, damage from battery leakage, or problems arising from
normal wear or failure to follow instructions.

Limitation of Warranty

This warranty does not apply to defects resulting from product modification made by Purchaser without Keithley's express
written consent, or by misuse of any product or part.

Disclaimer of Warranties

EXCEPT FOR THE EXPRESS WARRANTIES ABOVE KEITHLEY DISCLAIMS ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ALL IMPLIED WARRANTIES OF MERCHANT­ABILITY AND FITNESS FOR A PARTICULAR PURPOSE. KEITHLEY DISCLAIMS ALL WARRANTIES WITH
RESPECT TO THE OTHER HARDWARE AND OTHER SOFTWARE.

Limitation of Liability

KEITHLEY INSTRUMENTS SHALL IN NO EVENT, REGARDLESS OF CAUSE, ASSUME RESPONSIBILITY FOR
OR BE LIABLE FOR: (1) ECONOMICAL, INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, PUNITIVE OR
EXEMPLARY DAMAGES, WHETHER CLAIMED UNDER CONTRACT, TORT OR ANY OTHER LEGAL THEORY,
(2) LOSS OF OR DAMAGE TO THE CUSTOMER'S DATA OR PROGRAMMING, OR (3) PENALTIES OR PENALTY
CLAUSES OF ANY DESCRIPTION OR INDEMNIFICATION OF THE CUSTOMER OR OTHERS FOR COSTS, DAM­AGES, OR EXPENSES RELATED TO THE GOODS OR SERVICES PROVIDED UNDER THIS WARRANTY.

Keithley Instruments, Inc.

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

CHINA: Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-6202-2886 • Fax: [phone]
FINLAND: Tietäjäntie 2 • 02130 Espoo • Phone: [phone] • Fax: [phone]
FRANCE: 3, allée des Garays • 91127 Palaiseau Cédex • 01-64 53 20 20 • Fax: [phone]
GERMANY: Landsberger Strasse 65 • 82110 Germering • 089/84 93 07-40 • Fax: [phone]
GREAT BRITAIN: Unit 2 Commerce Park, Brunel Road • Theale • Berkshire RG7 4AB • 0118 929 7500 • Fax: [phone]
INDIA: Flat 2B, Willocrissa • 14, Rest House Crescent • Bangalore 560 001 • 91-80-509-1320/21 • 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: Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: [phone]
SWEDEN: c/o Regus Business Centre • Frosundaviks Allé 15, 4tr • 169 70 Solna • 08-509 04 679 • Fax: [phone]
SWITZERLAND: Kriesbachstrasse 4 • 8600 Dübendorf • 01-821 94 44 • Fax: [phone]
TAIWAN: 1FL., 85 Po Ai Street • Hsinchu, Taiwan, R.O.C. • 886-3-572-9077• Fax: [phone]

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

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

4/02

EXP-800/1600 User’s Guide

Revision A - February 1995

Part Number: 92030

New Contact Information

Keithley Instruments, Inc.

28775 Aurora Road

Cleveland, OH 44139

Technical Support: 1-888-KEITHLEY

Monday – Friday 8:00 a.m. to 5:00 p.m (EST)

Fax: [phone]

Visit our website at http://www.keithley.com

S

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

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

Operators

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

Maintenance personnel

the line voltage or replacing consumable materials. Maintenance procedures are described in the manual. The proce­dures explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.

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

properly trained service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are rated Installation Category I and Installation

Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most mea­surement, control, and data I/O signals are Installation Category I and must not be directly connected to mains voltage
or to voltage sources with high transient over-voltages. Installation 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.

age is present in any unknown 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,

may be exposed.

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.

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

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

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

afety Precautions

A good safety practice is to expect that hazardous volt-

no conductive part of the circuit

5/02

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.

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 con-

nections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation re-

quires the use of a lid interlock.

If or is present, connect it to safety earth ground using the wire recommended in the user documentation.

!

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

The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined
effect of normal and common mode voltages. Use standard safety precautions to avoid personal contact with these
voltages.

The

WARNING

associated information very carefully before performing the indicated procedure.
The

CAUTION

the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits, including the 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

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

The information contained in this manual is believed to be accurate and reliable. However, Keithley
Instruments, Inc., assumes no responsibility for its use or for any infringements of patents or other rights
of third parties that may result from its use. No license is granted by implication or otherwise under any
patent rights of Keithley Instruments, Inc.

KEITHLEY INSTRUMENTS, INC., SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES RELATED TO THE USE OF THIS PRODUCT. THIS
PRODUCT IS NOT DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY
SUITABLE FOR USE IN LIFE SUPPORT OR CRITICAL APPLICATIONS.

Refer to your Keithley Instruments license agreement for specific warranty and liability information.

MetraByte is a trademark of Keithley Instruments, Inc. All brand and product names are trademarks or
registered trademarks of their respective companies.

© Copyright Keithley Instruments, Inc., 1995.

All rights reserved. Reproduction or adaptation of any part of this documentation beyond that permitted
by Section 117 of the 1976 United States Copyright Act without permission of the Copyright owner is
unlawful.

Keithley MetraByte Division

Keithley Instruments, Inc.

440 Myles Standish Boulevard, Taunton, Massachusetts 02780

Telephone: [phone]

● FAX: [phone]

Table of Contents

Preface

1 Overview

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

Supporting Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

2 Functional Description

Ground Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Input Conditioning Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Multiplexer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Instrumentation Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

CJC Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

3 Inspection and Setup

Unwrapping and Inspecting Your EXP-800/1600 . . . . . . . . . . . .3-1

Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Setting the Input-Conditioning Options. . . . . . . . . . . . . . . . . . . . 3-4

Signal Filtering (Switch 1) . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

Open-Thermocouple Detection (Switches 2 and 3) . . . . . . . .3-5

Ground Selection (Switches 3 and 4) . . . . . . . . . . . . . . . . . . .3-5

4-to-20 mA Current Measuring. . . . . . . . . . . . . . . . . . . . . . . .3-5

Setting the Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Setting the CJC-Select Switch . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7

Positioning the Output-Channel-Select and

CJC-Channel-Select Jumpers . . . . . . . . . . . . . . . . . . . . .3-8

Setting the Power-Select Switch . . . . . . . . . . . . . . . . . . . . . . . . .3-9

Installing in an ENCL Series Enclosure . . . . . . . . . . . . . . . . . . .3-9

4 Cabling and Wiring

Connecting to a DAS-800/1600/1400/1200 Series Board . . . . . .4-1

Connecting to a DASCard-1000 Series Card. . . . . . . . . . . . . . . .4-2

Connecting Multiple EXP-800/1600s on Standoffs. . . . . . . . . . .4-3

iii

Connecting Multiple EXP-800/1600s in an ENCL Series

Enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

Connecting an FWA-EXP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

Connecting an FWA-37U. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Connecting Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-11

Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12

Precautions for Using a DAS Board/Card at

High Gains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12

Additional Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12

Common Connection Schemes for Differential Inputs. . . . . 4-13

Avoiding Ground Loops with Differential Inputs . . . . . . . . .4-14

5 Calibration

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Equipment Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Potentiometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

Calibration Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Analog Offset Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

CJC Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

6 Troubleshooting

Problem Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

Testing the Board/Card and Host Computer . . . . . . . . . . . . . .6-3

Testing the Input Connections. . . . . . . . . . . . . . . . . . . . . . . . .6-3

Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4

A Specifications

B Connector Pin Assignments

C Channel Numbers for Software

Channel Numbering for DAS-800 Series Boards . . . . . . . . . . . C-1

Channel Numbering for DAS-1600/1400/1200 and

DASCard-1000 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Index

iv

List of Figures

Figure 2-1. Block Diagram of EXP-800/1600 . . . . . . . . . . . . .2-2

Figure 2-2. EXP-800/1600 Input Conditioning Circuits . . . . .2-3

Figure 3-1. Configuration Component Locations on the

EXP-800 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Figure 3-2. Configuration Component Locations on the

EXP-1600 . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

Figure 3-3. A 4-Pole DIP Switch for Input Conditioning

Options (switches closed when ON). . . . . . . .3-4

Figure 3-4. EXP-800 Jumper Block . . . . . . . . . . . . . . . . . . . . .3-8

Figure 3-5. EXP-1600 Jumper Block . . . . . . . . . . . . . . . . . . . .3-8

Figure 3-6. Power-Select Circuit . . . . . . . . . . . . . . . . . . . . . . .3-9

Figure 3-7. ENCL-4 Enclosure with Four Pairs of Slotted

Card Guides (rear panel not shown) . . . . . . .3-10

Figure 3-8. ENCL-4 Enclosure with Four EXP-800/1600s

Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11

Figure 4-1. Connecting an EXP-800/1600 to a DAS Board. . .4-1
Figure 4-2. Connecting an EXP-1600 to a DASCard-1000

Series Card . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Figure 4-3. Connecting Multiple EXP-800/1600s on

Standoffs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Figure 4-4. Connecting External Power for EXP-800/1600s

(on Standoffs) Attached to a DAS Board . . . .4-4

Figure 4-5. Connecting External Power for EXP-800/1600s

(on Standoffs) Attached to a

DASCard-1000 Series Card . . . . . . . . . . . . . .4-5

Figure 4-6. Connecting Multiple EXP-800/1600s in an

ENCL Series Enclosure . . . . . . . . . . . . . . . . .4-6

Figure 4-7. Connecting External Power to EXP-800/1600s

in an ENCL Series Enclosure (lower two

EXP-800/1600s are powered by

DAS board). . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

Figure 4-8. Connecting External Power to EXP-1600s in an

ENCL Series Enclosure Attached to a

DASCard-1000 Series Card . . . . . . . . . . . . . .4-8

Figure 4-9. Attaching an FWA-EXP to an EXP-800/1600 . . .4-9
Figure 4-10. Clamping Wire Pairs Attached to Screw

Terminals of the FWA-EXP . . . . . . . . . . . . .4-10

Figure 4-11. Attaching an FWA-37U to an EXP-800/1600. . . 4-10
Figure 4-12. Clamping Wire Pairs Attached to Screw

Terminals of the FWA-37U . . . . . . . . . . . . .4-11

v

Figure 4-13. Three Types of Connections for Wiring a

Signal Source to an FWA-EXP or to

Connector J1 . . . . . . . . . . . . . . . . . . . . . . . . .4-13

Figure 4-14. Differential Input Configuration that Avoids a

Ground Loop. . . . . . . . . . . . . . . . . . . . . . . . .4-14

Figure 4-15. Differential Input Configuration with a

Ground Loop. . . . . . . . . . . . . . . . . . . . . . . . .4-15

Figure 5-1. Calibration-Component Locations on the

EXP-800/1600 . . . . . . . . . . . . . . . . . . . . . . . .5-3

Figure 5-2. Output-Channel-Select Pin Locations on the

EXP-800/1600 Jumper Block J6 . . . . . . . . . .5-6

Figure 5-3. CJC-Channel-Select Pin Locations on the

EXP-800/1600 Jumper Block J6 . . . . . . . . . .5-7

Figure B-1. Pin Assignments for Connectors P2 and

P3 of the EXP-800 . . . . . . . . . . . . . . . . . . . . B-1

Figure B-2. Pin Assignments for Connectors P2 and

P3 of the EXP-1600 . . . . . . . . . . . . . . . . . . . B-2

Figure B-3. Pin Assignments for Main I/O Connectors of

DAS-800 Series Boards and for Connector P4

of the EXP-800 . . . . . . . . . . . . . . . . . . . . . . . B-2

Figure B-4. Pin Assignments for the Main I/O Connectors of

DAS-1600/1400/1200 Series Boards, the

Cable for DASCard-1000 Series Cards, and

Connector P4 of the EXP-1600 . . . . . . . . . . B-3

Figure B-5. Pin Assignments for Connector J1 of the

EXP-800/1600 . . . . . . . . . . . . . . . . . . . . . . . B-4

Figure C-1. Analog Input Channel Numbering for Software

Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Figure C-2. Analog Input Channels . . . . . . . . . . . . . . . . . . . . C-4

List of Tables

Table 2-1. Examples of Gain Settings on Input Voltages . . . .2-5

Table 2-2. Digital Values for 24.4 mV/˚C . . . . . . . . . . . . . . .2-6

Table 6-1. Troubleshooting Information. . . . . . . . . . . . . . . . .6-1

Table A-1. General Specifications . . . . . . . . . . . . . . . . . . . . . A-1

Table C-1. Channels in Maximum EXP-800 Configuration . C-1
Table C-2. Channels in Maximum EXP-1600 Configuration C-3

vi

Preface

This guide is intended to help you understand the installation, interface
requirements, functions, and operation of the EXP-800 and the EXP-1600
expansion accessories. The EXP-800 is an accessory for the DAS-800
Series boards; the EXP-1600 is an accessory for DAS-1600/1400/1200
Series boards and the DASCard-1000 Series PCMCIA cards. In this
guide, the term EXP-800/1600 refers to the EXP-800 and/or the
EXP-1600.

This guide focuses primarily on describing the EXP-800/1600 and its
capabilities, setting up this accessory, and making typical hookups. There
are also chapters on calibration and troubleshooting. To follow the
information and instructions contained in this manual, you must be
familiar with data-acquisition principles and application.

The EXP-800/1600 User’s Guide is organized as follows:

● Chapter 1 describes the features and accessories of the

EXP-800/1600.

● Chapter 2 describes operating features of the EXP-800/1600 in more

detail. This chapter contains a block diagram and brief descriptions of
the features as they relate to your options for setting up and using an
EXP-800/1600.

● Chapter 3 contains instructions for inspecting and setting up the

EXP-800/1600.

● Chapter 4 shows the preferred methods of making I/O (Input/Output)

connections to a DAS board and available accessories.

● Chapter 5 discusses calibration requirements and instructions.

● Chapter 6 contains information on isolating and determining the

source of operating problems. This chapter also contains instructions
for obtaining technical support.

vii

● Appendix A contains EXP-800/1600 specifications.

● Appendix B contains pin assignments for the DAS boards and

EXP-800/1600 I/O connectors.

● Appendix C describes the assignment of logical channel numbers for

a DAS board and all attached EXP-1800s for use in software such as
the Control Panel utility.

● An index completes the manual.

viii

Features

1

Overview

This chapter discusses the features, supporting software, and accessories
of the EXP-800 and EXP-1600. The EXP-800 and EXP-1600 appear
identical except for their channel-jumper blocks. They also differ in
circuitry and in the number of output channels (the EXP-800 provides
eight channels, while the EXP-1600 provides 16 channels).

Features of the EXP-800/1600 include the following:

● Contains 16 differential inputs.

● Multiplexes its inputs under control of the host DAS board.

● Connects in a daisy chain to additional EXP-800/1600s through

ribbon cable to provide up to 128 inputs for a DAS-800 Series boards
or 256 inputs for a DAS-1600/1400/1200 Series board or a
DASCard-1000 Series card.

● Provides a jumper block for selecting one channel of a DAS board to

receive signal input and for selecting a different channel of the DAS
board to receive CJC (cold-junction compensation).

● Offers switch-selectable gains of 0.5, 1, 5, 10, 50, 100, 250, and 500.

● Works with optional, plug-in, field-wiring accessories containing

convenient screw terminals.

● Provides mass-termination connector access for its own I/O channels

and for the DAS board I/O.

● Accepts power from the computer or from an external source that

switches in only while the computer is on.

Features 1-1

● Provides holes for a 4-to-20 mA current-measuring resistor at each

input (actual range is 100 µA to 100 mA).

● Contains a switch-activated, 80 Hz, passive filter for each input.

● Contains a switch-activated, open-thermocouple-detection circuit for

each input.

● Contains a switch-activated, low-side, bias resistor for each input.

(Before you use this circuit, refer to the cautionary note on page 3-5.)

● Conforms to VME 6U card size and fits a variety of Eurocard

enclosures, including the ENCL Series desktop enclosures from
Keithley MetraByte.

● Contains trimpots for setting the RTI (referenced to input) and RTO

(referenced to output) zeroes of the instrumentation amplifier and for
adjusting the CJC gain.

Supporting Software

Software for the DAS-800/1200/1400/1600 Series boards and the
DASCard-1000 Series cards also supports the EXP-800/1600. This
software is described in the user’s guides for the DAS boards/cards.

Accessories

The following accessories are available for EXP-800/1600s:

● CAB-3740 is the cable required to connect an EXP-800/1600 to a

DAS board; this cable is available in two lengths, as follows: the
CAB-3740/1 is 18 inches and the CAB-3740/2 is 36 inches.

● CAB-3740/F is a version of the CAB-3740 cable that is 4-inches long

and connects an EXP-1600 to the cable of a DASCard-1000 Series
card.

● CAB-40 is the cable you use to form a daisy chain of

EXP-800/1600s; this cable is available in two lengths, as follows: the
CAB-40 is 3 inches long and the CAB-40/1 is 18 inches long.

1-2 Overview

● CAB-PWR is the cable you use to connect external power to an

EXP-800/1600 in a daisy chain; this cable is available in two lengths,
as follows: the CAB-PWR is 4 inches long and the CAB-PWR/1 is 18
inches long.

● FWA-EXP is a field-wiring accessory containing screw terminals and

a CJC circuit. This accessory plugs into connector J1 of the
EXP-800/1600 to deliver signals from field wiring to the input
channels.

● FWA-37U is a field-wiring accessory containing screw terminals.

This accessory plugs into connector P4 on the EXP-800/1600 to route
signals from field wiring directly to the attached DAS board/card.

● ENCL Series are enclosures for one (ENCL-1), two (ENCL-2), or

four (ENCL-4) EXP-800/1600s with access for all required cabling
and accessories.

● PWR-5V is a power supply for supplying external power to

EXP-800/1600s; this supply converts 100 to 240 VAC at 50 to 60 Hz
to +5 VDC.

Accessories 1-3

2

Functional Description

This chapter describes features of the EXP-800/1600. The descriptions
are provided to familiarize you with the operating options and to enable
you to make the best use of your EXP-800/1600. Figure 2-1 shows the
block diagram for the EXP-800/1600.

2-1

FWA-EXP

input

Connector J1

Inputs

• Low-side ground connect

• Low-side bias return

• Current-sense resistor

Figure 2-1. Block Diagram of EXP-800/1600

Multiplexer

Channel

Differential

16

• Filtering

• Open TC detect

16:1

POD

Input conditioning circuits

at each input:

INT

Select

Switch

Buffer

FWA-37U

I/O

Connector P4

CJC

CJC

DAS Board/Card I/O

Powe r

EXT

Power

Select

EXPs

+5 V

J7

of

chain

daisy

+5 V to

Connector P3Connector P2

chain of

EXPs

Cable to

daisy

Gain Select

Instrumentation

Amplifier

Jumpers

Channel

-Select

and CJC

Output

board/card

DAS

MUX Control Lines

Cable to

J8

external

supply

INT

Switch

+5 V

from

2-2 Functional Description

Ground Types

An EXP-800/1600 contains separate grounds for low-level signals, analog
power returns, digital signals, and chassis ground. The ground for analog
signals is LL GND (low-level ground); as its title suggests, LL GND is
for low-level analog input signals and is designed to be as noise-free as
possible. The ground for analog power returns, bypass capacitors, and so
on, is GND A. The ground for digital signals is GND D. Chassis ground is
tied to the metal parts and back to GND D; chassis ground is CH GND.

Input Conditioning Options

The input of each EXP-800/1600 channel contains the conditioning
circuitry shown in Figure 2-2.

+5 V

Open TC Detect

R

TC

20 MΩ

Switch 2

CHAN n HI

User Input
Channel n

CHAN n LO

Low-Side

Connect

to

LL GND

RF1

1 kΩ

Mounting
Holes for
4-to-20
mA
Current
Measuring

RF2

1 kΩ

Switch 4

80 Hz Filter

CF 1.0 µF

Switch 1

CHAN n LO to MUX

Switch 3

R

Figure 2-2. EXP-800/1600 Input Conditioning Circuits

CHAN n HI to MUX

= 10 kΩ

BIAS

Low-Side

Bias Return

to GND A

Ground Types 2-3

Descriptions of the individual conditioning circuits are as follows:

●

Filtering - Closing switch 1 activates an 80 Hz low-pass filter

composed of R

Open-thermocouple detection - Closing switches 2 and 3 activates

●

an open-thermocouple detector composed of R

●

Low-side bias return - Closing switch 3 provides a reference to

analog power ground (GND A) through R

F1

, R

and C

F2

.

F

R

TC and

for ungrounded

BIAS

differential inputs. This reference to ground provides some isolation
from other channels.

Low-side ground connect - Closing switch 4 enables you to

●

reference an input directly to low-level ground (LL GND), making a
single-ended input. Before using this switch, refer to the cautionary
note on page 3-5.

Mounting holes for 4-to-20 mA current-measuring resistor -

●

Selecting and mounting a resistor in these holes allows you to make
4-to-20 mA measurements.

BIAS.

Multiplexer

Refer to “Setting the Input-Conditioning Options” on page 3-4 for
information on setting up the input conditioning options.

An EXP-800/1600 multiplexes signals from 16 differential analog input
channels into one signal for the analog output. The sequence of channel
sampling in the multiplexer is selected by a 4-bit TTL/CMOS-compatible
address on the mux control lines, which are labelled OUT 0 to OUT 3 on
EXP-800/1600 I/O connectors P2, P3, and P4 (see Appendix B for pin
assignments). An address of 0h selects channel 0, 1h selects channel 1, 2h
selects channel 2, and so on.

You set up the multiplexer channel-sampling sequence using the DAS
board/card’s Function Call Driver (see the user’s guide for the DAS
board/card’s Function Call Driver) or a software package. The DAS
board/card delivers the address codes to the EXP-800/1600 mux control
lines through outputs OP1 to OP4. Digital output control is transparent.

2-4 Functional Description

Caution:

To ensure good data (when using a software package other than
the Keithley MetraByte Function Call Driver), program the multiplexer
switching to allow sufficient time for the multiplexer to settle after
switching. You need a delay, in microseconds, that is approximately 40%
of the gain; for example, you need a delay of 200 µs at a gain of 500.

Instrumentation Amplifier

The multiplexer output feeds to an instrumentation amplifier (IA) with
switch-selectable gains of 1, 10, 100, and 500. The EXP-800/1600 also
contains a slide switch that allows multiplication of the gain setting by
factors of 1 or ½ . Table 2-1 shows examples of the effects of the
multiplier switch.

Table 2-1. Examples of Gain Settings on Input Voltages

Gain Setting With S2 = X1,

V

Needed for

in

±5 V Out

With S2 = X ½ ,

V

Needed for

in

±5 V Out

1

10 ±0.5 V ±1 V

100 ±0.05 V ±0.10 V

500 ±0.01 V ±0.02 V

±5 V ±10 V

In addition to setting the gain with switches alone, you can adjust the gain
by setting the switches for a gain of 1 and then selecting and installing a
resistor in special mounting holes on the EXP-800/1600. Refer to “Setting
the Gain” on page 3-6 for information on setting the gain by switch and/or
resistor.

The overall gain you set on the EXP-800/1600 combines with the gain of
the attached DAS board/card to produce a possible system gain of up to

4000. EXP-800/1600 gains are accurate to 0.02%.

Instrumentation Amplifier 2-5

CJC Circuits

The EXP-800/1600 and the FWA-EXP include CJC circuitry that delivers

0.0 mV at 0 ˚C and 24.4 mV/˚C. The latter value corresponds to the
digital values shown in Table 2-2.

Table 2-2. Digital Values for 24.4 mV/˚C

Input Mode Input Range Digital Value

Power

Unipolar 0 to 10 V

0 to 5 V

Bipolar ±10 V

±5 V

You can connect the CJC output voltage to any DAS board/card channel
using a jumper (refer to “Positioning the Output-Channel-Select and
CJC-Channel-Select Jumpers” on page 3-8).

The host computer can supply power sufficient to support a DAS
board/card and up to two attached EXP-800/1600s. If you need to attach
more than two EXP-800/1600s, you must power each additional
EXP-800/1600 from an external supply.

EXP-800/1600 circuitry for an external power supply contains a relay
activated by the +5 V supply of the host computer. When closed, the relay
carries power to the built-in DC/DC converter from an external +5 V
supply. The relay energizes to close its contacts only when the +5 V of the
host computer is available and connected to the activation circuit through
a slide switch. Refer to “Setting the Power-Select Switch” on page 3-9 for
information on setup.

10 bits/˚C
20 bits/˚C

5 bits/˚C
10 bits/˚C

2-6 Functional Description

Inspection and Setup

This chapter describes how to inspect and set up an EXP-800/1600. Read
this chapter before attempting to use your EXP-800 or EXP-1600.

Unwrapping and Inspecting Your EXP-800/1600

3

Caution:

perform the following procedure.

After you remove your wrapped EXP-800/1600 from its outer shipping
carton, proceed as follows:

1. The factory packages your EXP-800/1600 in an anti-static wrapper

2. Carefully remove the anti-static wrapping material. (You may wish to

3. Inspect the EXP-800/1600 and any other items from the package for

Your computer must be turned OFF and grounded before you

that must not be removed until you have discharged any static
electricity using either of the following methods:

– If you are equipped with a grounded wrist strap, you discharge

static electricity as soon as you hold the wrapped EXP-800/1600.

– If you are not equipped with a grounded wrist strap, discharge

static electricity by holding the wrapped EXP-800/1600 in one
hand while placing your other hand firmly on a metal part of the
computer chassis.

store the wrapping material for future use.)

signs of damage. If damage is apparent, return the damaged item to
the factory (see “Technical Support” on page 6-4).

Unwrapping and Inspecting Your EXP-800/1600 3-1

4. Check the contents of your package against the packing list. Report

any missing items, immediately.

5. When the inspection is complete, proceed with the setup.

Component Locations

Figure 3-1 shows the locations of all configurable EXP-800 components
while Figure 3-2 shows the locations of all configurable EXP-1600
components.

Connector for

cable to additional

EXP-800s

Location for

user-installed

gain-setting

channel

select

CH HI 7

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

FWA-37U to connect
field wiring to attached
DAS-800 Series board

P3

resistor

Gain-set

DIP switch

Output

CJC

channel

select

CH HI 7

CH HI 0

P4

Connector for

Output for +5 V

from external

supply

Power-select

switch

RU17

S4

CJC
gain

CH HI 0

adjust

INT

J7

S19

R33

Input for +5 V from

external supply

J8

R24

EXT

Gain-multiplier

S2

X0.5

R18

POD

S20

INT

CJC-select

switch

RTI

zero

adjust

slide switch

X1

RTO
zero

adjust

1

P2

CH13CH12

CH4 CH5 CH6 CH7

3456789

2

10111213141516

J1

Connector for

FWA-EXP to

connect field wiring

to EXP-800 inputs

CH14

Connector for

cable to

DAS-800 Series

board

CH15

CH11CH10CH9CH8

CH3CH2CH1CH0

DIP
switches for
input
conditioning
circuits

Mounting holes for
current-measuring
resistors

Figure 3-1. Configuration Component Locations on the EXP-800

3-2 Inspection and Setup

Connector for

cable to additional

EXP-1600s

Output for +5 V

from external

supply

Input for +5 V from

external supply

Connector for cable to

DAS-1600/1400/1200

Series or

DASCard-1000 Series

board/card

Output

channel

select

CJC

channel

select

P3

Power-select

Location for

user-installed

gain-setting

resistor

Gain-set

DIP switch

J6

CH0

CH15

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

P4

Connector for FWA-37U
to connect field wiring to

attached DAS

board/card

switch

INT

RU17

S4

CJC
gain

adjust

J7

EXT

S19

X0.5

R33

POD

INT

CJC-select

switch

J8

R24

Gain-multiplier

S2

X1

R18

S20

P2

RTI

zero

adjust

slide switch

CH4 CH5 CH6 CH7

RTO
zero

adjust

3456789

2

1

J1

Connector for FWA-EXP

to connect field wiring to

EXP-1600 inputs

CH14

CH13CH12

10111213141516

CH15

CH11CH10CH9CH8

CH3CH2CH1CH0

DIP
switches for
input
conditioning
circuits

Mounting holes for
current-measuring
resistors

Figure 3-2. Configuration Component Locations on the EXP-1600

Note:

R18, R24, and R33 are potentiometers requiring adjustment only
during the calibration process. Since your EXP-800/1600 is factory
calibrated, re-calibration should not be necessary until the initial
calibration period ends. Refer to Chapter 5 for calibration requirements
and procedures.

Component Locations 3-3

Setting the Input-Conditioning Options

The four switches in the input conditioning circuits for each channel are
contained in a 4-pole DIP switch that appears as shown in Figure 3-3.
Note that the switch numbers in the diagram of Figure 2-2 on page 2-3
correspond to the numbers printed on the DIP switch.

O

1 2 3 4

N

Figure 3-3. A 4-Pole DIP Switch for Input Conditioning Options

(switches closed when ON)

Generally, you leave all switches open for a pure differential input. You
close only switch 1 for a differential input that is to have low-pass
filtering. You close switches 1, 2, and 3 together for thermocouple
measurements. You close only switch 4 for a wide-band, single-ended
input. You close switches 1 and 4 together for a single-ended input that
requires low-pass filtering.

Note:

settings shorts R

Do not close switches 3 and 4 together, as this combination of

BIAS

The following subsections describe the use of each of the
input-conditioning circuits and their switches.

Signal Filtering (Switch 1)

Closing switch 1 combines resistors R
form an 80 Hz low-pass filter. Opening switch 1 disables the filter to give
faster settling time. A closed setting is recommended for thermocouple
measurements. The default setting for switch 1 is open.

to ground and seriously degrades performance.

and R

F1

with capacitor C

F2

F

to

3-4 Inspection and Setup

Open-Thermocouple Detection (Switches 2 and 3)

Closing switch 2 puts the 20 M Ω resistor, R
thermocouple input and the +5 V supply. Closing switch 3 completes the
open-thermocouple-detection circuit by putting the 10 k Ω resistor, R
between the low side of a thermocouple input and ground. Resistors R
and R

respond to an open thermocouple by changing the input

BIAS

voltage to + 5 V. As +5 V is much larger than the output voltage of a
thermocouple, you can develop a software routine to sense any input
voltage above a certain threshold and flag the open thermocouple. The
default setting for switches 2 and 3 is open.

Ground Selection (Switches 3 and 4)

Closing switch 3
for differential circuits that are not grounded. Switch 3 must be closed
when you wish to activate open-thermocouple detection. The default
setting for switch 3 is open.

Closing switch 4 enables you to reference an input to low-level ground
(LL GND). The default setting for switch 4 is open.

Caution:

position 4. Switching a single channel to LL GND is not generally a
problem. However, shorting multiple channels to LL GND can cause
significant ground current to flow (as a result of common-mode potential
between channel sources); the resulting noise and offsets can degrade not
only the channels so connected, but all other active channels. In this case,
using switch position 3 (R

provides a reference to analog power ground (GND A)

Use care when you short channels to LL GND using switch

to GND A) may give better results.

bias

, between the high side of a

TC

BIAS

TC

,

4-to-20 mA Current Measuring

The 4-to-20 mA current-measuring option requires the installation of a
resistor in the mounting holes for the desired channel input. These
mounting holes are located as shown in Figure 3-1 on page 3-2 and Figure
3-2 on page 3-3. A typical resistor value for 4-to-20 mA current
measuring is 250 Ω . (with 0.1% accuracy).

Setting the Input-Conditioning Options 3-5

While 4 to 20 mA is the more frequently used measuring range, the actual
measuring range of this option is 100 µA to 100 mA, at a nominal 0.03%
accuracy. To determine a resistance value for a particular current value,
use the relationship

R

where R
full-scale input range, DASGain is the gain of the DAS board/card,
EXPGain is the gain of the EXP-800/1600, and I
current flow. For example, for a DAS board gain of 8, an EXP-800/1600
gain of 100, and a full-scale current of 100 µA, the resistance becomes

for a resistance value of 125

Setting the Gain

You can set EXP-800/1600 gain in the following ways:

●

Using 2-pole DIP switch S4, you can set the gain to one of four
values, as follows:

Sample

Sample

-------------------------------------------------------------------------------------------------

=

DASGain()EXPGain()

10V±

I

()⋅⋅

FullScale

is the value of the current-measuring resistor, ±10 V is the

is the anticipated

R

Sample

----------------------------------------------------

=

8() 100()0.0001()

10

⋅⋅

˙

FullScale

Ω.

Pole 1 Pole 2 Gain

On On 1

On Off 10

Off On 100

Off Off 500

●

Using 2-position slide switch S2, you can select a multiplier value of
1 or ½ for the gain set with switch S4. At its × ½ setting, S2 converts
the gain values you can set with S4 from 1, 10, 100, or 500 to 0.5, 5,
50, or 250.

3-6 Inspection and Setup

Using resistor-mounting holes labelled RU17, you can select and

●

install a resistor to set a gain that differs from any of the
switch-selected values. To calculate a resistance value for RU17, use
the relationship

2R

----------------=

G 1–

F

R

I

where R

is the resistance value for RU17, R

I

5.11 k Ω ±1%, and G is the desired gain.

Note:

RU17 is effective only when switch S4 is set for a gain of 1. When
S4 is set for a gain of 10, 100, or 500, the presence of RU17 has no effect.

Setting the CJC-Select Switch

Switch S20 determines whether your data acquisition system uses the
CJC circuit on the EXP-800/1600 or the CJC circuit on the FWA-EXP.
The two positions for this switch are clearly marked as POD (for using the
CJC on the FWA-EXP) and INT (for using the CJC on the
EXP-800/1600).

While the CJC circuits on the EXP-800/1600 and the FWA-EXP are the
same, the CJC on an attached FWA-EXP gives the more accurate
measurement of temperature at the field-wiring connections. Therefore, if
you are using an attached FWA-EXP for thermocouple measurements, set
switch S20 to POD.

is a fixed resistance value of

F

Setting the CJC-Select Switch 3-7

Positioning the Output-Channel-Select and CJC-Channel-Select Jumpers

An EXP-800/1600 contains a 16-position jumper block (J6) that allows
you to select one channel for the EXP-800/1600 output and a separate
channel the CJC output. Figure 3-4 shows the EXP-800 jumper block set
as follows:

●

The output-channel-select jumper is set for channel 2.

●

The CJC-channel-select jumper is set for channel 5.

CJC channel

CH HI 7

65432

select

Output channel

CH HI 7

CH HI 0

select

1123456

jumpers for the same

CH HI 0

channel number

results in seriously

CAUTION

Setting the two

degraded

performance.

Figure 3-4. EXP-800 Jumper Block

Figure 3-5 shows the EXP-1600 jumper block set as follows:

The output-channel-select jumper is set for channel 3.

●

The CJC-channel-select jumper is set for channel 11.

●

Output channel select

CJC channel select

CH 15

14

131211

10

8

7

6

9

54321

Figure 3-5. EXP-1600 Jumper Block

CH 0

3-8 Inspection and Setup

Setting the Power-Select Switch

When you attach more than two EXP-800/1600s to a DAS board/card,
you must use external power for the additional EXP-800/1600s. In
addition, you must set the power-select switch (S19) of each additional
EXP-800/1600 to EXT.

Refer to Chapter 4 for additional instructions on connecting
EXP-800/1600s to an external power source. Figure 3-6 shows switch
S19 positioned at INT to power the DC-DC converter with power from
the +5 V supply of the host computer.

K1 Relay

From

External

+5 V

Supply

DC-DC

Converter

Out +

Out Ref

+15 V DC-DC

Out −

From PC

+5 V

Supply

EXT

INT

S19 SPDT
Slide Switch

Figure 3-6. Power-Select Circuit

Installing in an ENCL Series Enclosure

Each version of an ENCL Series enclosure contains slotted card guides
and a rear panel that accommodates the rear connectors of each installed
EXP-800/1600. Figure 3-7 shows an ENCL-4 enclosure (without rear
panel) with four pairs of slotted card guides. Screw holes for front-panel
screws of the EXP-800/1600s are shown on the front face of each card
guide.

−15 V DC-DC

Setting the Power-Select Switch 3-9

Figure 3-7. ENCL-4 Enclosure with Four Pairs of Slotted Card

Guides (rear panel not shown)

To install an EXP-800/1600 in an ENCL Series enclosure, perform the
following steps:

1. Remove the four standoffs from each EXP-800/1600 to be installed.

2. Insert an EXP-800/1600 into the slots of a pair of card guides.

3. Gently push the EXP-800/1600 toward the rear of the desktop

enclosure until the front-panel screws meet the tapped holes on the
card guides.

4. Fasten the front-panel screws to the card guides.

An ENCL-4 containing four EXP-800/1600s appears as shown in Figure
3-8.

3-10 Inspection and Setup

CAUTION

Do not mix EXP-800s with EXP-1600s

in an enclosure.

Figure 3-8. ENCL-4 Enclosure with Four EXP-800/1600s Installed

Refer to Chapter 4 for cabling instructions.

Installing in an ENCL Series Enclosure 3-11

4

Cabling and Wiring

This chapter describes how to make connections to your EXP-800/1600.

Caution:

acquisition system equipment before making connections.

Avoid electrical damage by turning off power to all your data

Connecting to a DAS-800/1600/1400/1200 Series Board

Before connecting an EXP-800/1600 to a DAS board, configure the
channels of the DAS board as single-ended inputs. An EXP-800/1600
connects directly to the main I/O connector of a DAS board through a
CAB-3740 cable, as shown in Figure 4-1.

FWA-EXP Input

J1

P2

FWA-37U Input

P3

P4

NOTE for DAS-801/802 use:

Switch 1 and any one other switch on

switch block S1 of a DAS-801/802 must be

set to ON (single-ended) in order for the

board to work with an EXP-800.

DAS Board

CAB-3740

Cable

Figure 4-1. Connecting an EXP-800/1600 to a DAS Board

Connecting to a DAS-800/1600/1400/1200 Series Board 4-1

Caution:

Connecting an EXP-800 to a DAS-1600/1400/1200 Series
board or an EXP-1600 to a DAS-800 Series board can damage either or
both boards.

Connecting to a DASCard-1000 Series Card

Before connecting an EXP-1600 to a DASCard-1000 Series card,
configure the channels of the DAS card as single-ended inputs. An
EXP-1600 connects to the DAS card cable through a CAB-3740/F cable,
as shown in Figure 4-2.

P4

FWA-37U

Input

FWA-EXP

Input

P3

P2

DASCard-1000

J1

CAB-3740/F

Cable

Figure 4-2. Connecting an EXP-1600 to a DASCard-1000 Series Card

Use external power for an EXP-1600 connected to a DASCard-1000
Series card to eliminate any unnecessary drain on the battery of the
portable computer. When use connect external power to the EXP-1600,
set the power-select switch to EXT.

4-2 Cabling and Wiring

Connecting Multiple EXP-800/1600s on Standoffs

You can attach up to 16 EXP-1600s to a DAS-1600/1400/1200 Series
board or DASCard-1000 Series card or up to eight EXP-800s to a
DAS-800 Series board. To connect one or more additional
EXP-800/1600s that are mounted on standoffs (EXP-800/1600s are
factory-fitted with standoffs), use CAB-40/1 cables as shown in Figure
4-3.

CAB-40/1

Cable

P3

FWA-37U Input

P2

FWA-EXP Input

CAUTION

Do not mix EXP-800s with EXP-1600s

in a daisy chain.

CAB-40/1

Cable

P3

FWA-37U Input

P2

FWA-EXP Input

To DAS

board/card

Figure 4-3. Connecting Multiple EXP-800/1600s on Standoffs

If you are connecting multiple EXP-800/1600s to a DAS board, the
computer furnishes power through the DAS board for the first two
EXP-800/1600s in a daisy chain. If you attach more than two
EXP-800/1600s to a DAS board you must use external power for the
additional EXP-800/1600s. Connect the external power as shown in
Figure 4-5.

When you connect more than one EXP-800 /1600 in a daisy chain,

Note:

the digital lines to all EXP-800/1600s are in parallel and therefore
delivering the same multiplexer channel-selection sequence to all attached
EXP-800/1600s simultaneously.

Connecting Multiple EXP-800/1600s on Standoffs 4-3

board

To DAS

EXP-800/1600

CAUTION:

power supply output

The center terminal of the

connector must be positive,

Cables

CAB-PWR/1

PWR-5V/E

PWR-5V or

Power Supply

will not work.

or the power switching

circuit of the EXP-800/1600s

EXP-800/1600

EXP-800/1600

Attached to a DAS Board

EXP-800/1600

Figure 4-4. Connecting External Power for EXP-800/1600s (on Standoffs)

EXP-800/1600

4-4 Cabling and Wiring

If you are connecting multiple EXP-1600s to a DASCard-1000 Series
card, you must use external power for all the EXPs in the daisy chain.
Although the power supply in a portable computer can power an
EXP-1600, the resulting drain of battery power is substantially faster than
normal. Connect the external power as shown in Figure 4-5.

To

Series Card

DASCard-1000

EXP-1600

PWR-5V/E

PWR-5V or

Power Supply

Cables

CAB-PWR/1

EXP-1600

CAUTION:

power supply output

The center terminal of the

connector must be positive,

not work.

or the power switching

circuit of the EXP-1600s will

EXP-1600

Standoffs) Attached to a DASCard-1000 Series Card

Figure 4-5. Connecting External Power for EXP-800/1600s (on

Set the power-select switch (S19) to EXT on each EXP-800/1600
connected to the external power supply. When you connect the
CAB-PWR/1 cables as shown in Figure 4-5, you can power up to four
EXP-800/1600s from a single power supply (this limitation is caused by
wire size). If you use parallel connections from the power supply, the only
limitation is the current capacity of the power supply.

Connecting Multiple EXP-800/1600s on Standoffs 4-5

Connecting Multiple EXP-800/1600s in an ENCL Series Enclosure

To connect one or more additional EXP-800/1600s that are mounted in an
ENCL Series enclosure, use CAB-40 cables as shown in Figure 4-6. You
can attach up to 16 EXP-1600s to a DAS-1600/1400/1200 Series board or
DASCard-1000 Series card or up to eight EXP-800s to a DAS-800 Series
board in this manner.

CAB-40/1 to Additional

EXP-800/1600s

P2

P2

CAB-40

P2

P2

CAB-3740/1 or CAB-3740/2
to DAS Board; CAB-3740/F

to DASCard-1000 Series

P3

CAB-40

P3

P3

CAB-40

P3

Rear Panel

CAUTION

Do not mix EXP-800s with EXP-1600s

in an enclosure.

Figure 4-6. Connecting Multiple EXP-800/1600s in an ENCL Series

Enclosure

The DAS board furnishes power for the first two EXP-800/1600s in a
daisy chain. When you attach a DAS board to more than two
EXP-800/1600s mounted in an ENCL Series enclosure, you must use
external power for the additional EXP-800/1600s, as shown in Figure 4-7.

4-6 Cabling and Wiring

Note:

When you connect more than one EXP-800 /1600 in a daisy chain,
the digital lines to all EXP-800/1600s are in parallel and therefore
delivering the same multiplexer channel-selection sequence to all attached
EXP-800/1600 simultaneously.

CAB-PWR/1 to

next

EXP-800/1600

P2

P2

P2

P2

To DAS

board

P3

P3

P3

P3

CAB-PWR

Cable from
External Power
Supply

CAUTION:

The center terminal of the power

supply output must be positive, or the

power switching circuit of the

EXP-800/1600s will not work.

Figure 4-7. Connecting External Power to EXP-800/1600s in an ENCL Series

Enclosure (lower two EXP-800/1600s are powered by DAS board)

If you are connecting multiple EXP-1600s to a DASCard-1000 Series
card, you must use external power for all the EXPs in the daisy chain.
Although the power supply in a portable computer can power an
EXP-1600, the resulting drain of battery power is substantially faster than
normal. Connect the external power as shown in Figure 4-8.

Connecting Multiple EXP-800/1600s in an ENCL Series Enclosure 4-7

t

CAB-PWR/1 to

next

EXP-800/1600

P3

P3

P3

P3

CAB-PWR

CAUTION:
The center terminal of the power
supply output connector must be

positive, or the power switching circui

of the EXP-1600s will not work.

To DASCard-1000

Series Card

P2

P2

P2

P2

CAB-PWR/1
from External
Power Supply

Figure 4-8. Connecting External Power to EXP-1600s in an ENCL Series

Enclosure Attached to a DASCard-1000 Series Card

Set the power-select switch (S19) to EXT on each EXP-800/1600
connected to the external power supply. When you connect the
CAB-PWR and CAB-PWR/1 cables as shown in Figure 4-7 on page 4-7,
you can power up to four EXP-800/1600s from a single power supply
(this limitation is caused by wire size). If you use parallel connections
from the power supply, the only limitation is the current capacity of the
power supply.

4-8 Cabling and Wiring

Connecting an FWA-EXP

The FWA-EXP field wiring accessory is a compact, screw-terminal panel
that plugs into connector J1 of an EXP-800/1600. This accessory provides
an interface between field wiring and circuits of the EXP-800/1600. The
FWA-EXP contains a CJC circuit that can be connected to any DAS
board/card channel by setting switch S20 to POD and setting the
CJC-channel-select jumper on the EXP-800/1600. Before attaching the
FWA-EXP, remove the two retainer screws from connector J1 on the
EXP-800/1600. Attach the FWA-EXP as shown in Figure 4-9. Secure the
FWA-EXP to J1 using the two retainer screws.

J1

P2

FWA-EXP

P3

EXP-800/1600

Figure 4-9. Attaching an FWA-EXP to an EXP-800/1600

Note:

The CJC screw terminals on the FWA-EXP require no
connections. You make all connections between the CJC and a DAS
board/card channel by setting the CJC jumper and switch S20 on the
EXP-800/1600.

The clamp on the side of the FWA-EXP is provided to serve as a strain
relief for field wiring attached to the screw terminals. Run all field wiring
through the clamp as shown in Figure 4-10.

Connecting an FWA-EXP 4-9

Figure 4-10. Clamping Wire Pairs Attached to Screw Terminals of the

Connecting an FWA-37U

Clamp

FWA-EXP

The FWA-37U field wiring accessory is a compact, screw-terminal panel
that plugs into connector P4 of an EXP-800/1600. This accessory
provides direct access to the DAS board/card main I/O connector. The
FWA-37U attaches to an EXP-800/1600 as shown in Figure 4-11.

P2

FWA-37U

P3

EXP-800/1600

Figure 4-11. Attaching an FWA-37U to an EXP-800/1600

P4

Clamp J2 on the side of the FWA-37U is provided to serve as a strain
relief for field wiring attached to the screw terminals. Run all field wiring
through clamp J2 as shown in Figure 4-12.

4-10 Cabling and Wiring

Figure 4-12. Clamping Wire Pairs Attached to Screw Terminals of the

Note:

A breadboard area of plated-through holes contains three rows of
bussed holes labeled LLGND, GNDD, and 5V+PC. Because none of
these holes connects to any signal track on the panel, you must wire each
of the three rows of bussed holes to a screw terminal that carries the
corresponding signal (to determine what screw terminals carry what
signals, refer to the pin assignments for your DAS board in Appendix B).

Connecting Signals

This section contains precautionary advice on making I/O connections.
The section also shows some circuits for wiring signal sources to inputs of
an EXP-800/1600.

Clamp

J2

Clamp

J3

FWA-37U

The circuit diagrams in this section represent a single signal source wired
to a single channel (channel n). In reality, you can wire separate signal
sources to all the channels.

Connecting Signals 4-11

Precautions

If you expect to use a DAS board/card at high gain, read the precautionary
information in the following subsection. Other considerations for I/O
connections are offered under “Additional Precautions” on page 4-12.

Precautions for Using a DAS Board/Card at High Gains

Operating a DAS board/card with an EXP-800/1600 above gains of 50
can lead to problems if your application setup is sensitive to noise. At a
gain of 250, each bit of analog output corresponds to 10
input. Thus, with the high speed and bandwidth of this system, analog
noise and performance degradation occur easily unless you take
precautions to avoid them. The following collection of ideas and
suggestions is aimed at avoiding these problems:

Minimize noise from crosstalk and induced-voltage pickup in flat

●

cables and screw-terminal accessories by using shielded cable.
Connect the shield to CH GND and the inner conductors to Channel
LO and HI. Channel LO and LL GND should have a DC return (or
connection) at some point; this return should be as close to the signal
source as possible. Induced noise from RF and magnetic fields can
easily exceed tens of microvolts, even on one- or two-foot cables;
shielded cable eliminates this problem.

µ

V of analog

Avoid bi-metallic junctions in the input circuitry. For example, the

●

kovar leads, used on reed relays, typically have a thermal emf to
copper of 40

µ

V/˚C. Thermals can introduce strange random

variations caused by air currents, and so on.

●

Consider filtering. This approach can use hardware (resistors,
capacitors, and so on) but is often accomplished more easily with
software. Instead of taking a single channel reading, take 10 or more
readings in quick succession and average them. If the noise is random
and gaussian, averaging the multiple readings will reduce the noise by
the square-root of the number of readings.

Additional Precautions

Do NOT mix your data acquisition inputs with the AC line, or you risk
damaging the computer. Data acquisition systems give you access to
inputs of the computer. An inadvertent short between data and power lines
can cause extensive and costly damage to your computer. The

4-12 Cabling and Wiring

manufacturer can accept no liability for this type of accident. To prevent
this problem, take the following precautions:

Avoid direct connections to an AC line.

●

Make sure all connections are tight and sound so that signal wires are

●

not likely to come loose and short to high voltages.

●

Use isolation amplifiers where necessary.

Common Connection Schemes for Differential Inputs

Figure 4-13 shows three connection schemes for wiring a floating signal
source to a channel of an FWA-EXP or to connector J1 on an
EXP-800/1600.

Where Rs > 100 Ω
R

= 2000 R

b

Where Rs < 100 Ω
Rb = 1000 R

s

s

Supply

DC

Signal

Source

Signal

Source

+

-

+

R

s

-

R

s

Bridge

R

v

R

s

R

+

-

b

R

b

Channel n High

Channel n Low

R

b

LL GND

Channel n High

Channel n Low

LL GND

Channel n

High

Channel n Low

LL GND

To screw terminals
of an FWA-EXP or
to connector J1

To screw terminals
of an FWA-EXP or
to connector J1

To screw terminals
of an FWA-EXP or
to connector J1

Figure 4-13. Three Types of Connections for Wiring a Signal Source to an

FWA-EXP or to Connector J1

Connecting Signals 4-13

The upper two circuits of the diagram require the addition of resistors to
provide a bias-current return. You can determine the value of the bias
return resistors (R

) from the value of the source resistance (R

b

following relationships:

●

When R

is greater than 100 Ω , use the connections in the upper

s

circuit. The resistance of each of the two bias return resistors must
equal 2000 R

●

When R

.

s

is less than 100 Ω , use the connections in the middle circuit.

s

The resistance of the bias return resistor must be greater than 1000 R

In the lower circuit of Figure 4-13, bias current return is inherently
provided by the source. The circuit requires no bias resistors. R
signal source resistance while R

is the resistance required to balance the

v

bridge.

Avoiding Ground Loops with Differential Inputs

), using the

s

is the

s

.

s

Very often, the signal-source ground and the EXP-800/1600 ground are
not at the same voltage level because of the distances between equipment
wiring and the building wiring. This difference is referred to as a

common-mode voltage

(V

) because it is normally common to both

cm

sides of a differential input (it appears between each side and ground).
Since a differential input responds only to the difference in the signals at
its high and low inputs, its common-mode voltages cancel out and leave
only the signal. However, if your input connections contain a ground loop,
your input could see the sum of the signal-source and common-mode
voltages. Figure 4-14 shows the proper way to connect a differential
input.

+

Signal

Source

E

s

-

Signal Source

Ground V

g 1

Figure 4-14. Differential Input Configuration that Avoids a

Channel n High

Channel n Low

V

c m

R

wire

V

= V

g 1

- V

c m

Ground Loop

LL GND

V

g 2

g 2

E

To screw terminals

s

of an FWA-EXP or
to connector J1

Do not join Low

to LL GND at the

computer

4-14 Cabling and Wiring

Figure 4-15 illustrates the effect inadvertently adding a ground loop to
your input configuration.

Signal

Source

Signal Source

Ground V

+

E

s

-

g 1

Channel n High

Channel n Low

V

c m

R

wire

V

= V

g 1

- V

c m

Es + V

LL GND

V

g 2

g 2

c m

To screw terminals
of an FWA-EXP or
to connector J1

NOTE:

Use care to avoid

this configuration.

Figure 4-15. Differential Input Configuration with a Ground Loop

Connecting Signals 4-15

General

5

Calibration

Your EXP-800/1600 is initially calibrated at the factory. You are advised
to check the calibration of a board every six months and to calibrate again
when necessary. This chapter describes the requirements and procedures
for calibrating an EXP-800/1600.

The EXP-800/1600 has two circuit sections that require calibration. The
first is the analog offset (RTI/RTO) adjustments in the gain circuit. The
second is the CJC gain adjustment in the CJC gain circuit. If you do not
plan to make CJC measurements, you can omit CJC calibration.

Equipment Requirements

The equipment requirements for calibrating an EXP-800/1600 are as
follows:

●

DAS board/card . Use one of the following DAS boards/cards to

control the EXP-800/1600 channel-selection circuit during analog
offset calibration:

– For EXP-800 calibration, use a DAS-800, DAS-801, or DAS-802.

– For EXP-1600 calibration, use a DAS-1600, DAS-1400, or

DAS-1200 Series board, or a DASCard-1000 Series card.

General 5-1

Control Panel utility . Use one of the following Control Panel

●

utilities (provided with the DAS board software package) to control
EXP-800/1600 operation:

– For EXP-800 calibration, use either the DAS-800 Control Panel

utility for MS DOS (CTL800.EXE) or for Windows
(CTL800W.EXE).

– For EXP-1600 calibration with a DAS board, use either the

DAS-1600 Control Panel utility for DOS (CTL1600.EXE) or for
Windows (CTL1600W.EXE).

– For EXP-1600 calibration with a DASCard-1000 Series card, use

the DASCard-1000 Series Control Panel utility for DOS
(CTL1000.EXE) or for Windows (CTL1000W.EXE).

●

DMM . Use a 4 ½ digit digital voltmeter.

FWA-EXP optional accessory . Attach an FWA-EXP (or

●

mass-termination connector) to EXP-800/1600 I/O connector J1.

CAB-3740 cable . Use a CAB-3740 cable to connect an

●

EXP-800/1600 to a DAS board.

●

●

Potentiometers

Figure 5-1 shows the locations of the potentiometers used in the
calibration of an EXP-800/EXP-1600. The calibration procedure,
described in the next section, directs you to these components and
explains how to use them during the calibration process.

CAB-3740/F cable . Use a CAB-3740/F cable to connect an

EXP-1600 to a DASCard-1000 Series card.

Temperature-measurement device . If you need to calibrate CJC

circuitry, use a digital thermometer or other type of
temperature-measurement device with an accuracy of ±2 ˚C.

5-2 Calibration

EXP-800

TP4

RTI
Zero
Adjust

EXP-1600

TP4

TP3

Gain-Set
DIP Switch

TP3

Gain-Set
DIP Switch

R24

S19

RU17

TP2

TP1

TP2

TP1

R33

POD

INT

R33

POD

INT

S20

S2

R24

S2

S20

R18

R18

RTO
Zero
Adjust

RTI
Zero
Adjust

RTO
Zero
Adjust

S4

CJC
Gain
Adjust

S19

RU17

S4

CJC
Gain

J6

Adjust

Figure 5-1. Calibration-Component Locations on the EXP-800/1600

Potentiometers 5-3

Calibration Procedure

This section contains the procedures for calibrating an EXP-800/1600.

Calibration Setup

To set up the calibration of an EXP-800 or EXP-1600, perform the
following steps:

1. If the EXP-800/1600 is installed in an ENCL Series enclosure,

remove the EXP from the enclosure and attach the four standoffs to
allow access to the component side of its PC board (refer to
“Installing in an ENCL Series Enclosure” on page 3-9).

2. On the FWA-EXP (or mass-termination connector), wire CH15 HI to

CH15 LO and CH15 LO to GND A.

3. Set the following switches on the EXP:

Warning

Note:

settings of all jumpers and switches on the EXP-800/1600 for later
reference.

– If you are going to calibrate the CJC circuit located on the

– Set power-select switch S19 to INT if you are using internal

4. Select a DAS board/card to be connected to the EXP-800 or

EXP-1600 according to the DAS board/card list under “Equipment
Requirements” on page 5-1.

Connecting an EXP-800 to a DAS-1600/1400/1200 Series board or a
DASCard Series card, or connecting an EXP-1600 to a DAS-800 Series
board can damage either or both boards.

Before making any changes, note the original positions and

EXP-800/1600, set CJC-select switch S20 to INT; if you are
going to calibrate the CJC circuit located on the FWA-EXP, set
CJC-select switch S20 to POD.

power or to EXT if you using external power (refer to “Setting
the Power-Select Switch” on page 3-9).

5-4 Calibration

5. Make sure the DAS board/card is functioning properly (refer to the

DAS board/card user’s guide for more information).

6. Connect the EXP-800/1600 to the DAS board using a CAB-3740

cable or to a DASCard-1000 Series card using a CAB-3740/F cable.

Note:

make no connections to P4 of the EXP-800/1600.

Connect only one EXP-800/1600 to the DAS board/card, and

Analog Offset Adjustment

Using the DAS Control Panel utility for the DAS board (refer to Control
Panel utility under “Equipment Requirements” on page 5-1) perform the
following steps to adjust analog offset:

1. After you select the DAS board/card configuration file, select the

Panels option from the menu bar at the top of the first screen of the

Control Panel utility.

2. Select the Digital and Counter/Timer option from the menu.

3. On the Digital and Counter/Timer panel, type the value F into the

digital output box.

4. Invoke the Output control to set the DAS board/card digital output

lines to the value 15 decimal (Fh), which addresses channel 15 of the
EXP-800/1600.

5. Set the DMM function to DC (auto range).

6. Connect the DMM low lead to LL GND on the FWA-EXP (or

mass-termination connector) and the high lead to any unused (not
having a jumper) J6 output-channel-select pin on the EXP-800/1600
to monitor the output level of the instrumentation amplifier. The
output-channel-select pins are located as shown in Figure 5-2.

Calibration Procedure 5-5

EXP-800

EXP-1600

CH HI 7

65432

CH 15

14

131211

CH HI 7

CH HI 0

10

8

7

6

9

54321

CH HI 0

1123456

CH 0

Place DMM high lead on
any unused pin among
the eight rightmost pins
in this row

Place DMM high lead on
any unused pin in this
row

Figure 5-2. Output-Channel-Select Pin Locations on the

EXP-800/1600 Jumper Block J6

7. For RTO, set switch S4 for a gain of 1 (refer to “Setting the Gain” on

page 3-6) and adjust potentiometer R18 until the DMM indicates a
reading of 0.0 ±0.001 V.

8. For RTI, set switch S4 for a gain of 500 and adjust potentiometer R24

until the DMM indicates a reading of 0.0 ±0.002 volts.

9. Because potentiometers R18 and R24 are interactive, you must repeat

both the RTO and RTI adjustments until the DMM indicates you have
obtained the voltage levels stated in steps 7 and 8.

5-6 Calibration

CJC Calibration

Use the following steps to calibrate the CJC circuit:

1. Use the temperature-measuring device to obtain a measurement (t

meas

in ˚C) at the CJC you selected in step 4 under “Calibration Setup” on
page 5-4.

2. Connect the DMM low lead to LL GND on the FWA-EXP (or

mass-termination connector) and the high lead to any unused (not
having a jumper) J6 CJC-channel-select pin on the EXP-800/1600 to
monitor the output level of the CJC circuit. The CJC-channel-select
pins are located as shown in Figure 5-3.

EXP-800

EXP-1600

CH HI 7

65432

CH 15

14

131211

CH HI 7

CH HI 0

10

8

7

6

9

54321

CH HI 0

1123456

CH 0

Figure 5-3. CJC-Channel-Select Pin Locations on the EXP-800/1600

Jumper Block J6

Place DMM high lead on
any unused pin among
the eight leftmost pins in
this row

Place DMM high lead on
any unused pin in this
row

3. Use the following equation to calculate V

the voltage that equates

equ,

to the temperature measurement obtained in step 1:

V

= 24.4 mV/˚C × t

equ

4. Adjust R33 until the DMM indicates a voltage of V

meas

equ

(mV).

5. Remove the DMM leads from the connection points on the

EXP-800/1600 and FWA-EXP.

Calibration Procedure 5-7

6. Disconnect the EXP-800/1600 from the DAS board/card and the

FWA-EXP.

7. Restore the EXP-800/1600 switches and jumper settings to their

original settings.

8. If the EXP-800/1600 was removed from an ENCL Series enclosure,

remove the standoffs and return the EXP-800/1600 to the enclosure.

5-8 Calibration

Problem Isolation

6

Troubleshooting

This chapter describes how to respond to a problem in the operation of
your data acquisition system. If the problem appears serious enough to
warrant technical support, refer to “Technical Support” on page 6-4 for
information on how to contact an applications engineer.

Use the instructions in this section to isolate the cause of a problem before
calling Keithley MetraByte for technical support. Table 6-1 lists some
symptoms and possible solutions for problems with an EXP-800/1600.

Table 6-1. Troubleshooting Information

Symptom Possible Cause Possible Solution

Computer does not
boot.

System lockup A timing error occurred. Press [Ctrl] + [Break] .

EXP-800/1600
appears not to
operate

The power supply of the
computer is too small to handle
all the system components.

Configuration is incorrect.

If using external power, polarity
is wrong.

The EXP-800/1600 is damaged.

Check the needs of all system
components and obtain a larger power
supply or use external power.

Check the configuration of your
EXP-800/1600 and of the DAS
board/card.

Polarity of center contact on external
power supply cables must be positive.

Contact the Keithley MetraByte
Applications Engineering Department;
see page 6-4.

Problem Isolation 6-1

Table 6-1. Troubleshooting Information (cont.)

Symptom Possible Cause Possible Solution

Intermittent
operation

Data appears to be
invalid

The most common cause of this
problem is that the I/O bus speed
is in excess of 8 MHz.

Vibrations or loose connections
exist.

The EXP-800/1600 is
overheating.

Electrical noise exists.

The most common cause of this
problem is that the I/O bus speed
is in excess of 8 MHz.

An open connection exists.

Transducer is improperly
connected to channel being read.

Reduce I/O bus speed to a maximum of
8 MHz (to change the I/O bus speed, see
your computer documentation for
instructions on running BIOS setup).

Cushion source of vibration and tighten
connections.

Check ambient temperature. See the
documentation for your computer.

Provide better shielding or reroute
unshielded wiring.

Reduce I/O bus speed to a maximum of
8 MHz (to change the I/O bus speed, run
BIOS setup). See the documentation for
your computer for instructions on
running BIOS setup.

Check wiring to screw terminals.

Check the transducer connections.

Transducer is a differential type.

Programming for application
does not allow sufficient
multiplexer settling time.

Check transducer specifications and
board configuration.

Refer to the caution under “Multiplexer”
on page 2-4.

If your board is not operating properly after using the information in
Table 6-1, continue with the next two sections to isolate the problem.

6-2 Troubleshooting

Testing the Board/Card and Host Computer

To isolate the problem to the EXP-800/1600 or to the DAS board/card and
host computer, use the following steps:

1. Turn off and disconnect power connections to the host computer.

2. Turn off and disconnect any external power connections to the

EXP-800/1600.

Caution:

power on can cause damage to your accessory, your board, and/or
your computer.

3. While keeping connections to accessories intact, unplug the accessory

cable connector from the DAS board/card.

4. Visually check the EXP-800/1600 for damage. If there is obvious

damage, refer to “Technical Support” on page 6-4 for information on
returning the board.

5. With the EXP-800/1600 disconnected, check the DAS board/card for

proper operation. If the DAS board/card does not operate properly,
refer to its user’s guide for troubleshooting instructions.

If the computer and DAS board/card are operating properly and you have
another EXP-800/1600 that is functional, you can test the input
connections using the instructions in the next section. If you do not have
another board, refer to the instructions on page 6-4 before calling Keithley
Technical Support.

Disconnecting a DAS board/card or accessory with the

Testing the Input Connections

When you are sure that the computer and DAS board/card are operating
properly, test the EXP-800/1600 input connections using another
EXP-800/1600 that is functional. To test the input connections, follow
these steps:

1. Turn computer power off and connect an EXP-800/1600 accessory

that is functional. Do not make any connections to the EXP-800/1600
inputs.

Problem Isolation 6-3

2. Turn computer power ON and check operation with the functional

EXP-800/1600 in place.

3. If the EXP-800/1600 now functions, reconnect and check the

operation of the input connections, one at a time.

4. If operation fails for an input connection, check the input for shorts

and opens.

5. If operation remains normal to this point, the problem is in the

originally attached EXP-800/1600.

6. If you cannot isolate the problem, refer to the next section for

instructions on obtaining assistance.

Technical Support

Before returning any equipment for repair, call the Keithley Applications
Engineering Department at:

1-888-KEITHLEY
Monday - Friday, 8:00

A.M.

- 5:00

, Eastern Time

P.M.

An applications engineer will help you diagnose and resolve your
problem over the telephone. Please make sure you have the information
on the following page available before you call.

6-4 Troubleshooting

EXP-800/1600

DAS board/card
Configuration

Computer

Operating system

Model
Serial #
Revision code
Number of channels
Invoice/order #

Model
Serial #
Revision code
Base address setting
Interrupt level setting
Number of channels
Input (S.E. or Diff.)
Mode (uni. or bip.)
DMA chan(s)
Number of SSH-8s
Number of EXPs.

Manufacturer
CPU type
Clock speed (MHz)
KB of RAM
Video system
BIOS type

DOS version
Windows version
Windows mode

___________________
___________________
___________________
___________________
___________________

___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________

___________________
___________________
___________________
___________________
___________________
___________________

___________________
___________________
___________________

Software package

Compiler
(if applicable)

Accessories

Technical Support 6-5

Name
Serial #
Version
Invoice/Order #

Language
Manufacturer
Version

Type
Type
Type
Type
Type
Type
Type

___________________
___________________
___________________
___________________

___________________
___________________
___________________

___________________
___________________
___________________
___________________
___________________
___________________
___________________

If a telephone resolution is not possible, the applications engineer will
issue you a Return Material Authorization (RMA) number and ask you to
return the equipment. Include the RMA number with any documentation
regarding the equipment.

When returning equipment for repair, include the following information:

●

Your name, address, and telephone number.

●

The invoice or original purchase order number and date of equipment
purchase.

●

Non-warranty repair purchase order number.

A description of the problem or its symptoms.

●

●

The RMA number on the outside of the package.

Repackage the equipment, using the original anti-static wrapping, if
possible, and handling it with ground protection. Ship the equipment to:

ATTN.: RMA# _______
Repair Department
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139-1891

Telephone 1-888-KEITHLEY
FAX [phone]

Notes:

If you are submitting your equipment for repair under warranty,

you must include the invoice number and date of purchase.

To enable Keithley to respond as quickly as possible, you must include
the RMA number on the outside of the package.

6-6 Troubleshooting

Specifications

Tables A-1 lists specifications for the EXP-800/1600.

Table A-1. General Specifications

Feature Specification

Number of inputs 16 differential inputs

Amplifier

Configuration

Instrumentation amplifier with gains of 1, 10, 100,
and 500

A

Gain accuracy

Relative accuracy

Input characteristics

Input offset current

Input bias current

Input Offset Voltage

CMRR for 0 Hz to 1 kHz
range

Input filter response Single-pole RC @ 80 Hz ±20%

±0.01% of reading, typical
±0.02% of reading, maximum

±0.001% of reading, typical

0.6 nA maximum @ 25˚C
50 nA maximum @ 0 to 70˚C

1 nA maximum @ 25˚C
100 nA maximum @ 0 to 70˚C

6.0 mV maximum, trimmable to zero

90 dB typical @ gain = 1
100 dB typical @ gain = 10
110 dB typical @ gain = 100
110 dB typical @ gain = 500

Two 1 kΩ resistors connected differentially across
1 µF capacitor

A-1

Table A-1. General Specifications (cont.)

Feature Specification

Temperature coefficients

Gain

±5 ppm/˚C

Bandwidth (no filter)

Full-power bandwidth

Small-signal bandwidth

Noise

CJC (on FWA-EXP)

Power requirements

From +5 V 160 mA typical; 250 mA maximum

Offset

rms

p-p

Output

Accuracy

±10 µV for gain = 1, typical
±2 µV for gain = 50, typical

150 kHz @ gain = 1
4 kHz @ gain = 500

180 kHz @ gain = 1
5 kHz @ gain = 500

1 mV @ gain = 1; 8 µV @ gain = 500

5 mV at gain = 1; 50 µV @ gain = 500

+24.4 mV/˚C

@ 25˚C: ±0.4˚ C typical; ±1.0˚C maximum

A-2 Specifications

B

Connector Pin Assignments

This appendix contains pin assignments for connectors of the
EXP-800/1600s, DAS-800/1600 Series boards, DASCard-1000 Series
cards, and accessories for the EXP-800/1600s.

NC - 39

NC - 37
LL GND - 35
LL GND - 33
LL GND - 31
LL GND - 29
LL GND - 27
LL GND - 25
LL GND - 23

GND D - 21

OUT 3 - 19
OUT 2 - 17
OUT 1 - 15
OUT 0 - 13

NC - 11

NC - 09

NC - 07

NC - 05

NC - 03

NC - 01

40 - NC
38 - NC
36 - DCH HI 00
34 - DCH HI 01
32 - DCH HI 02
30 - DCH HI 03
28 - DCH HI 04
26 - DCH HI 05
24 - DCH HI 06
22 - DCH HI 07
20 - 5 V +PC
18 - GND D
16 - NC
14 - NC
12 - NC
10 - NC
08 - NC
06 - NC
04 - NC
02 - NC

Figure B-1. Pin Assignments for Connectors P2 and P3 of the

EXP-800

Note: In the pin assignment diagrams, NC stands for no connection.

B-1

NC - 39

LLGND - 37
DCH HI 08 - 35
DCH HI 09 - 33
DCH HI 10 - 31
DCH HI 11 - 29
DCH HI 12 - 27
DCH HI 13 - 25
DCH HI 14 - 23
DCH HI 15 - 21

NC - 19
NC - 17
NC - 15

GND D - 13

NC - 11

NC - 09
OUT 1 - 07
OUT 3 - 05

NC - 03

5 V + PC - 01

40 - NC
38 - NC
36 - DCH HI 00
34 - DCH HI 01
32 - DCH HI 02
30 - DCH HI 03
28 - DCH HI 04
26 - DCH HI 05
24 - DCH HI 06
22 - DCH HI 07
20 - LL GND
18 - LL GND
16 - NC
14 - NC
12 - NC
10 - NC
08 - OUT 0
06 - OUT 2
04 - NC
02 - NC

Figure B-2. Pin Assignments for Connectors P2 and P3 of the

EXP-1600

DAS-800

VREF +10 V - 19

LL GND - 18
LL GND - 17

LL GND - 16
LL GND - 15

LL GND - 14
LL GND - 13
LL GND - 12

GND D - 11

OP4 - 10
OP3 - 09
OP2 - 08

OP1 - 07
OUT2 - 06
OUT1 - 05

CLK1 - 04

OUT0 - 03

CLK0 - 02

−12 V- 01

37 - IN0+
36 - IN1+
35 - IN2+
34 - IN3+
33 - IN4+
32 - IN5+
31 - IN6+
30 - IN7+
29 - +5 V
28 - D GND
27 - IP3
26 - IP2
25 - IP1/TRIG
24 - INT IN/X CLK
23 - Gate 2
22 - Gate 1
21 - Gate 0
20 - −12 V

DAS-801, DAS-802

IN0− - 19
IN1− - 18
IN2− - 17
IN3− - 16

IN4− - 15
IN5− - 14
IN6− - 13
IN7− - 12

GND D - 11

OP4 - 10
OP3 - 09
OP2 - 08

OP1 - 07
OUT2 - 06
OUT1 - 05

CLK1 - 04

OUT0 - 03

CLK0 - 02

−12 V- 01

37 - IN0+
36 - IN1+
35 - IN2+
34 - IN3+
33 - IN4+
32 - IN5+
31 - IN6+
30 - IN7+
29 - +5 V
28 - GND D
27 - IP3

26 - IP2
25 - IP1/TRIG
24 - INT IN/X CLK
23 - Gate 2
22 - Gate 1
21 - Gate 0
20 - −12 V

Figure B-3. Pin Assignments for Main I/O Connectors of DAS-800 Series Boards and for

Connector P4 of the EXP-800

B-2 Connector Pin Assignments

LL GND - 19

DAS-1600, DASCard-1000

DAS-1400, DAS-1200

37 - CH0 HI IN
36 - CH1 HI IN
35 - CH2 HI IN
34 - CH3 HI IN
33 - CH4 HI IN
32 - CH5 HI IN
31 - CH6 HI IN
30 - CH7 HI IN
29 - LL GND
28 - LL GND
27 - NC
26 - NC

20 - CTR 2 OUT

LL GND - 19
CH0 LO/CH8 HI - 18
CH1 LO/CH9 HI - 17

CH2 LO/CH10 HI - 16

25 - IP0/EXT CLK
24 - IP2/CTR 0 Gate
23 - OP0
22 - OP2
21 - CTR 0 CLK IN

CH3 LO/CH11 HI - 15
CH4 LO/CH12 HI - 14
CH5 LO/CH13 HI - 13
CH6 LO/CH14 HI - 12
CH7 LO/CH15 HI - 11

NC - 10
NC - 09

VREF (-5 V) - 08

PWR GND - 07
IP1/XTRIG - 06

IP3 - 05
OP1 - 04
OP3 - 03

CTR 0 OUT- 02

+5 V - 01

CH0 LO/CH8 HI - 18
CH1 LO/CH9 HI - 17

CH2 LO/CH10 HI - 16
CH3 LO/CH11 HI - 15
CH4 LO/CH12 HI - 14
CH5 LO/CH13 HI - 13
CH6 LO/CH14 HI - 12
CH7 LO/CH15 HI - 11

DAC 0 IN - 10

DAC 0 OUT - 09

VREF (-5 V) - 08

PWR GND - 07
IP1/XTRIG - 06

IP3 - 05
OP1 - 04
OP3 - 03

CTR 0 OUT- 02

+5 V - 01

37 - CH0 HI IN
36 - CH1 HI IN
35 - CH2 HI IN
34 - CH3 HI IN
33 - CH4 HI IN
32 - CH5 HI IN
31 - CH6 HI IN
30 - CH7 HI IN
29 - LL GND
28 - LL GND
27 - DAC 1 OUT
26 - DAC 1 IN
25 - IP0/EXT CLK
24 - IP2/CTR 0 Gate
23 - OP0
22 - OP2
21 - CTR 0 CLK IN
20 - CTR 2 OUT

Figure B-4. Pin Assignments for the Main I/O Connectors of DAS-1600/1400/1200 Series

Boards, the Cable for DASCard-1000 Series Cards, and Connector P4 of the EXP-1600

B-3

CH GND

CH HI 14

GND A

CH HI 12

LL GND

CH HI 10

CH LO 10

GND A

CH LO 08

CJC

CH LO 06

GND A

CH LO 04

CH HI 02
CH LO 02
CH LO 00

CH GND

17

50

33

16

49

32

15

48

31

14

47

30

13

46

29

12

45

28

11

44

27

10

43

26

9

42

25

8

41

24

7

40

23

6

39

22

5

38

21

4

37

20

3

36

19

2

35

18

1

34

51 52

GND A
CH LO 14
LL GND
CH LO 12
GND A
CH LO 11
CH LO 09
CH HI 08
CH LO 07
CH HI 06
CH HI 05
CH HI 04
CH HI 03
GND A
CH HI 00
GND A

CH GND
CH HI 15
CH LO 15
CH HI 13
CH LO 13
CH HI 11
CH HI 09
LL GND
CH HI 07
5VPA
GND A
LL GND
CH LO 05
CH LO 03
CH HI 01
CH LO 01
CH GND

CH GND

Figure B-5. Pin Assignments for Connector J1 of the EXP-800/1600

B-4 Connector Pin Assignments

C

Channel Numbers for Software

This appendix describes the assignment of channel numbers for a DAS
board/card and all attached EXP-800/1600s for use in software such as
the Control Panel utility.

Channel Numbering for DAS-800 Series Boards

DAS-800 Series boards contain eight analog input channels, numbered 0
through 7. If you require additional channels, you can use up to eight
16-channel EXP-800 expansion accessories to increase the number of
available channels to 128. Expansion accessories are assigned to
consecutive analog input channels of the DAS-800 Series board,
beginning with onboard channel 0. Table C-1 lists the software (logical)
channels associated with each expansion accessory.

Table C-1. Channels in Maximum EXP-800 Configuration

DAS-800 Series

Onboard Channel

0 0 to 15

1 16 to 31

2 32 to 47

3 48 to 63

4 64 to 79

5 80 to 95

6 96 to 111

7 112 to 127

Channel Numbering for DAS-800 Series Boards C-1

EXP-800 Software

(Logical) Channels

Figure C-1 illustrates the use of three EXP-800s and the five remaining
onboard channels on a DAS-800 Series board configured for single-ended
mode. In software such as the Control Panel utility, you refer to the
physical channels on the EXP-800 attached to analog input channel 0 as
logical channels 0 to 15, the physical channels on the EXP-800 attached
to analog input channel 1 as logical channels 16 to 31, and the physical
channels on the EXP-800 attached to analog input channel 2 as logical
channels 32 to 47. You refer to the remaining 13 onboard analog input
channels (physical channels 3 through 7) in software as logical channels
48 through 52.

EXP-800
channels
0 to 15

EXP-800
channels
16 to 31

EXP-800
channels
32 to 47

DAS-800
Series Board

0
1
2
3
4
5
6
7

Onboard
channels
48 to 52

Figure C-1. Analog Input Channel Numbering for Software Control

You can perform an analog input operation on a single channel or on
multiple channels.

Channel Numbering for the DAS-1600/1400/1200 and DASCard-1000 Series

DAS-1600/1400/1200 Series boards are switch-configurable for either 16
single-ended analog input channels (numbered 0 through 15) or eight
differential analog input channels (numbered 0 through 7). If you require
more than the 16 single-ended onboard channels, you can use up to 16
EXP-1600s to increase the number of available channels to 256.

C-2 Channel Numbers for Software

EXP-1600s are assigned to consecutive onboard analog input channels,
beginning with onboard channel 0. Table C-2 lists the software (or
logical) channels associated with each EXP-1600.

Table C-2. Channels in Maximum EXP-1600 Configuration

Onboard Channel

0 0 to 15

1 16 to 31

2 32 to 47

3 48 to 63

4 64 to 79

5 80 to 95

6 96 to 111

7 112 to 127

8 128 to 143

9 144 to 159

10 160 to 175

11 176 to 191

12 192 to 207

13 208 to 223

EXP-1600 Software
(Logical) Channels

14 224 to 239

15 240 to 255

Figure C-2 illustrates the use of three EXP-1600s and the 13 remaining
onboard channels on a DAS-1600/1400/1200 Series board configured for
single-ended mode. In software such as the Control Panel utility, you
refer to the physical channels on the EXP-1600 attached to analog input
channel 0 as logical channels 0 to 15, the physical channels on the
EXP-1600 attached to analog input channel 1 as logical channels 16 to
31, and the physical channels on the EXP-1600 attached to analog input

Channel Numbering for the DAS-1600/1400/1200 and DASCard-1000 Series C-3

channel 2 as logical channels 32 to 47. You refer to the remaining 13
onboard analog input channels (physical channels 3 to 15) in software as
logical channels 48 to 60.

EXP-1600

channels

0 to 15

EXP-1600

0
1

15

2
3

.
.
.

Onboard
channels
48 to 60

DAS-1600/1400/1200

Series Board

Figure C-2. Analog Input Channels

channels

16 to 31

EXP-1600

channels

32 to 47

C-4 Channel Numbers for Software

Index

A

accessory

CAB-3740 1-2
CAB-3740/F 1-2
CAB-40 1-2
CAB-PWR 1-3
ENCL Series 1-3, 4-6
FWA-37U 1-3, 4-10
FWA-EXP 1-3, 4-9

PWR-5V 1-3
amplifier, instrumentation 2-5
analog power ground (GND A) 2-3
anti-static wrapper 3-1
Applications Engineering 6-4
avoiding ground loops 4-14

CJC

circuit 2-6, 4-9

select switch 3-7
common mode voltages 4-14
component locations 3-2
conditioning circuitry 2-3
connecting

an FWA-37U 4-10

an FWA-EXP 4-9

differential inputs 4-13

multiple EXP-800/1600s 4-3, 4-6

multiple EXP-800/1600s in desktop

enclosure 4-6

multiple EXP-800/1600s on standoffs

4-3

signals 4-11

to a DAS Board 4-1

to a DASCard-1000 Series card 4-2
current measuring, 4-to-20 mA 3-5
current-measuring, 4-to-20 mA 2-4

B

bias return, low-side 2-4
block diagram 2-1

C

cable

CAB-3740 1-2, 4-1, 4-2
CAB-3740/F 1-2
CAB-40 1-2, 4-6

CAB-PWR 1-3
cabling and wiring instructions 4-1
calibration 5-1
channels, logical C-3
CH GND (chassis ground) 2-3

D

DASCard-1000 PCMCIA board 1-2
DC-DC converter 2-6
desktop enclosure 1-3
detection, open-thermocouple 2-4
diagram, block 2-1
digital 2-3
digital ground (GND D) 2-3
DIP switch, 4-pole 3-4

E

ENCL Series enclosure 1-3, 3-9
expansion accessories C-1

X-1

F

L

features 1-1
filtering 2-4
FWA-37U accessory 1-3
FWA-EXP accessory 1-3

G

gain 2-5, 3-6
gain resistor

mounting holes 2-5

value for 3-7
GND A (analog power ground) 2-3
GND D (digital ground) 2-3
ground

CH GND 2-3

connect, low-side 2-4

GND A 2-3

GND D 2-3

LL GND 2-3

loops, avoiding 4-14

selection 3-5

LL GND (low level ground) 2-3
logical channels C-3
low level ground (LLGND) 2-3
low-pass filter 2-4
low-side

bias return 2-4
ground connect 2-4

M

mounting holes

current resistor 2-4
gain resistor 2-5

multiple EXP-800/1600s 4-3

in a desktop enclosure 4-6

on standoffs 4-3
multiplexer 2-4
multiplier switch, gain 2-5
mux control lines 2-4

O

I

input-conditioning options 2-3
instrumentation amplifier 2-5

open-thermocouple detection 2-4, 3-5

P

pin assignments

J

jumper

CJC channel select 3-8
output channel select 3-8

X-2 Index

I/O connectors, EXP-1600 B-2

I/O connectors, EXP-800 B-1
POD 3-7
potentiometers 5-2
power supplies 2-6
precautions 4-12
problem isolation 6-1
procedure, calibration 5-2
PWR-5V accessory 1-3

R

resistors, bias return 4-13
returning equipment 6-6
RMA number 6-6

S

signal filtering 3-4
signals, connecting 4-11
specifications A-1
switch

CJC select 3-7
gain multiplier 3-6
gain set 3-6
input-conditioning circuits 3-4
power-select 3-9

T

technical support 6-4
test points 5-2

W

warranty repairs 6-6
wrapper, anti-static 3-1
wrist strap 3-1

X-3

Specifications are subject to change without notice.
All Keithley trademarks and trade names are the property of Keithley Instruments, Inc.

All other trademarks and trade names are the property of their respective companies.

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

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

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© Copyright 2002 Keithley Instruments, Inc.

Printed in the U.S.A.

9/02