Tektronix DAS-1600/1400 Series Users Guide

DAS-1600/1400 Series

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

DAS-1600/1400 Series

User’s Guide

Revision C - December 1998

Part Number: 80940

The information contained in this manual is believed to be accurate and reliable. However, the
manufacturer assumes no responsibility for its use; nor 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 the manufacturer.

THE MANUFACTURER SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMA GES RELATED TO THE USE OF THIS PR ODUCT. THIS PRODUCT IS
NOT DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY THAT IS SUITED FOR
USE IN LIFE SUPPORT OR CRITICAL APPLICATIONS.

All brand and product names are trademarks or registered trademarks of their respective companies.

Copyright Keithley Instruments, Inc., 1998, 1996, 1994.



All rights reserved. Reproduction or adaptation of any part of this documentation beyond that permitted
by Section 117 of the 1979 United States Copyright Act without permission of the Copyright owner
is unlawful.

Keithley Instruments, Inc.

28775 Aurora Road, Cleveland, OH 44139

FAX: [phone]

Telephone: [phone]

●

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

Table of Contents

Preface

1

Overview

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

Supporting Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

Functional Description

2

Analog Input Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

Differential/Single-Ended Selection . . . . . . . . . . . . . . . . . . . 2-3

Unipolar/Bipolar Selection . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Channel Selection in Expanded Configurations . . . . . . . . . . .2-3

Gain Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

Conversion Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

Clock Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7

Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8

Data Transfer Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Analog Output Features (DAS-1600 Series Only) . . . . . . . . . .2-10

Digital I/O Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

Counter/Timer Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Wait State Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

3

Setup and Installation

Unwrapping and Inspecting Your Board . . . . . . . . . . . . . . . . . . .3-1

Installing and Configuring DriverLINX for DAS-1600/1400

Series Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Installing the DAS-1600/1400 Series Standard

Software Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

Before Installing DriverLINX . . . . . . . . . . . . . . . . . . . . . .3-3

Selecting the DriverLINX components to Install . . . . . . .3-4

Installing DriverLINX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

Configuration with DriverLINX . . . . . . . . . . . . . . . . . . . . . . .3-5

Setting Switch-Configurable Options . . . . . . . . . . . . . . . . . . . . . 3-6

Setting the DAC Bipolar/Unipolar Switch

(DAS-1600 Series Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8

iv

Setting the DAC0 and DAC1 Reference Voltage Switches

(DAS-1600 Series Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8

Setting the ADC Bipolar/Unipolar Switch . . . . . . . . . . . . . . .3-8

Setting the Chan 8/16 Switch . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Setting a Base Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Setting the Clock Select Switch . . . . . . . . . . . . . . . . . . . . . .3-10

Setting the Wait State Enable Switch . . . . . . . . . . . . . . . . . .3-10

Setting the DMA Channel Select Switch . . . . . . . . . . . . . . .3-10

Installing the Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11

Configuring DriverLINX . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12

4

Cabling and Wiring

Attaching Screw Terminal Accessories . . . . . . . . . . . . . . . . . . . . 4-2

Attaching an STC-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Attaching an STP-37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Attaching an STA-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Attaching an STA-U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Attaching Expansion Accessories . . . . . . . . . . . . . . . . . . . . . . . .4-9

Attaching an EXP-16 or EXP-16/A Expansion Accessory .4-10

Attaching an EXP-GP Expansion Accessory . . . . . . . . . . . .4-11

Attaching an EXP-1600 Accessory . . . . . . . . . . . . . . . . . . .4-12

Attaching Multiple Expansion Accessories . . . . . . . . . . . . .4-13

Attaching SSIO-24 and ERB-24 Accessories . . . . . . . . . . . . . .4-14

Attaching an ISO-4 Accessory . . . . . . . . . . . . . . . . . . . . . . . . .4-15

Attaching SSH Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-15

Attaching an SSH-4/A . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Attaching an SSH-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Attaching an MB Series Backplane . . . . . . . . . . . . . . . . . . . . .4-19

Attaching an MB01/05 Backplane . . . . . . . . . . . . . . . . . . . .4-20

Attaching an MB02 Backplane. . . . . . . . . . . . . . . . . . . . . . .4-21

Attaching an STA-MB . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22

Connecting Analog Input Signals . . . . . . . . . . . . . . . . . . . . . . .4-23

Connecting a Signal to a Single-Ended Analog Input. . . . . 4-24

Connecting a Signal to a Differential Analog Input . . . . . . .4-25

Avoiding a Ground Loop Problem . . . . . . . . . . . . . . . . . . . . . .4-26

Connecting Analog Output Signals . . . . . . . . . . . . . . . . . . . . . .4-28

Precautions for Operating at High Gains . . . . . . . . . . . . . . . . .4-28

Additional Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-29

5

DriverLINX Analog I/O Panel

Test Panel Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

v

Calibration

6

Equipment Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

Potentiometers and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Calibration Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2

7

Troubleshooting

Problem Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1

Using the DriverLINX Event Viewer . . . . . . . . . . . . . . . . . . .7-1

Device initialization error messages . . . . . . . . . . . . . . . . . . . 7-2

Identifying Symptoms and Possible Causes . . . . . . . . . . . . .7-2

Testing the Board and Host Computer . . . . . . . . . . . . . . . . . .7-5

Testing the Accessory Slot and I/O Connections . . . . . . . . . . 7-5

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-6

A

Specifications

Connector Pin Assignments

B

Main I/O Connector (J1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

PIO Cable Connector (J2) (DAS-1600 Series Only) . . . . . . . . B-2

C

Register-Level Address Map

Register Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

ADC Registers (Base Address +0h and +1h) . . . . . . . . . . . . . . C-3

MUX Scan Register (Base Address +2h) . . . . . . . . . . . . . . . . . C-4

Unidirectional Digital Input and Output Registers

(Base Address +3h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

DAC Output Registers (Base Address +4h to +7h)

(DAS-1600 Series Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6

DAC0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

DAC1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

DAC Controller Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8

Status Register A (Base Address +8h) . . . . . . . . . . . . . . . . . . . C-9

Control Register (Base Address +9h) . . . . . . . . . . . . . . . . . . . C-11

Counter Enable/Burst Length Register (Base Address +Ah) . C-13

Gain Selection/Burst Rate Register (Base Address +Bh) . . . . C-15

Programmable Interval Counter/Timer

(Base Addresses +Ch, +Dh, +Eh, +Fh) . . . . . . . . . . . . . . . . . . C-17

Generating Square Waves of Programmed Frequency . . . . C-20

Measuring Frequency and Period . . . . . . . . . . . . . . . . . . . . C-21

vi

Using Counter 0 for Generating

Programmable Time Delays . . . . . . . . . . . . . . . . . . . . . . . . C-21

82C54 Counter/Timer Control Register

(Base Address +Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-23

Readback Command Byte

(Returned when SC1 and SC0 are 1) . . . . . . . . . . . . . . C-26

Status Byte Format (Returned if STA =0) . . . . . . . . . . . C-27

Bidirectional Digital Ports A, B, CL, and CH 8255A-5

(Base Address +400h to +403h) . . . . . . . . . . . . . . . . . . . . . . . C-27

Control Register (Base Address +403h) . . . . . . . . . . . . . . . C-29

Conversion Disable Register (Base Address +404h) . . . . . . . C-31

Burst Mode Enable Register (Base Address +405h) . . . . . . . . C-32

1600/1400 Mode Enable Register (Base Address +406h) . . . C-32

Status Register B (Base Address +407h) . . . . . . . . . . . . . . . . C-33

CE Mark Information

D

Limitation of Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

List of Figures

Figure 2-1. Functional Block Diagram. . . . . . . . . . . . . . . . . . 2-2

Figure 2-2. Expanding the Analog Inputs of DAS-1600/1400

Series Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Figure 2-3. Timing Relationships of Conversion Modes . . . .2-7

Figure 3-1. Default Switch Configuration for DAS-1600

Series Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Figure 3-2. Default Switch Configuration for

DAS-1400 Series Boards . . . . . . . . . . . . . . . . . . .3-7

Figure 3-3. Base Address, Clock Select,

and Wait State Enable Switch . . . . . . . . . . . . . . . .3-9

Figure 4-1. Attaching an STC-37 Screw Terminal Connector 4-3
Figure 4-2. Pin Assignments of the Main I/O Connector (J1) 4-4
Figure 4-3. Attaching an STP-37 to the Main I/O Connector .4-5

Figure 4-4. Attaching an STA-16 . . . . . . . . . . . . . . . . . . . . . .4-6

Figure 4-5. STA-16 Terminal Names . . . . . . . . . . . . . . . . . . . 4-7

Figure 4-6. Cabling and Connections for Attaching an STA-U .
4-8

Figure 4-7. STA-U Terminal Names . . . . . . . . . . . . . . . . . . . .4-8

Figure 4-8. Pin Assignments of PIO Cable Connector (J2) . .4-9

vii

Figure 4-9. Attaching an EXP-16 or EXP-16/A

Expansion Accessory . . . . . . . . . . . . . . . . . . . . .4-10

Figure 4-10. Attaching an EXP-GP Expansion Accessory . . . 4-12
Figure 4-11. Attaching an EXP-1600 to a DAS-1600/1400

Series Board . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12

Figure 4-12. Attaching Multiple EXP-16, EXP-16/A,

and /or EXP-GP Accessories . . . . . . . . . . . . . . . 4-13

Figure 4-13. Attaching Multiple EXP-1600 Accessories . . . .4-14

Figure 4-14. Attaching an SSIO-24 or ERB-24 Accessory . . . 4-14

Figure 4-15. Attaching an ISO-4 Accessory . . . . . . . . . . . . . .4-15

Figure 4-16. Attaching an SSH-4/A Accessory . . . . . . . . . . .4-16

Figure 4-17. Attaching SSH-8 Accessories . . . . . . . . . . . . . . .4-17

Figure 4-18. Attaching SSH-8 and STA-16 Accessories . . . .4-18

Figure 4-19. Typical Measurement and Control Application .4-19

Figure 4-20. Attaching an MB01/05 Backplane . . . . . . . . . . .4-20

Figure 4-21. Attaching Multiple MB02 Backplanes . . . . . . . .4-21

Figure 4-22. MB02 I/O Connections . . . . . . . . . . . . . . . . . . . .4-22

Figure 4-23. Cabling and Connections for

Attaching an STA-MB . . . . . . . . . . . . . . . . . . . . 4-23

Figure 4-24. Connections for Wiring a Signal Source

to a DAS-1600/1400 Series Board Configured for

Single-Ended Inputs . . . . . . . . . . . . . . . . . . . . . .4-24

Figure 4-25. Three Methods of Wiring Differential Inputs . . . 4-25
Figure 4-26. A Differential Input Connection that Avoids

a Ground Loop Problem . . . . . . . . . . . . . . . . . . .4-27

Figure 4-27. Differential or Single-Ended Input Connection

that Introduces a Ground Loop Problem . . . . . .4-27

Figure B-1. Pin Assignments of Main I/O Connector (J1)

on DAS-1600/1400 Series . . . . . . . . . . . . . . . . . B-1

Figure B-2. Pin Assignments of PIO Cable Connector (J2) . B-2

Figure C-1. Programmable Timer Configuration . . . . . . . . . C-17

List of Tables

Table 2-1. DAS-1601/1401 Gains, Ranges, and

Throughput Rates for Unipolar and

Bipolar Selections . . . . . . . . . . . . . . . . . . . . . . . . .2-5

Table 2-2. DAS-1602/1402 Gains, Ranges, and

Throughput Rates for Unipolar and

Bipolar Selections . . . . . . . . . . . . . . . . . . . . . . . . .2-5

Table 4-1. EXP-16 and EXP-16/A Terminal Names . . . . . . 4-10

Table 4-2. EXP-GP Terminal Names . . . . . . . . . . . . . . . . . .4-11

viii

Table 4-3. MB Series Backplanes. . . . . . . . . . . . . . . . . . . . .4-20

Table 4-4. DAC Input and Output Connections . . . . . . . . . .4-28

Table 7-1. Troubleshooting Information. . . . . . . . . . . . . . . . .7-3

Table A-1. Analog Input Specifications . . . . . . . . . . . . . . . . A-1

Table A-2. Analog Output Specifications . . . . . . . . . . . . . . . A-4

Table A-3. Digital I/O Specifications

(8-bits on Main I/O Connector). . . . . . . . . . . . . . A-5

Table A-4. Digital I/O Specifications (24-bits on

PIO Cable Connector) . . . . . . . . . . . . . . . . . . . . . A-5

Table A-5. Programmable Counter/Timer

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Table A-6. Power Supply Requirements . . . . . . . . . . . . . . . . A-6

Table A-7. Environmental Specifications . . . . . . . . . . . . . . . A-7

Table C-1. Register-Level Address Map. . . . . . . . . . . . . . . . C-2

Table C-2. DAC Bipolar Output Modes . . . . . . . . . . . . . . . . C-8

Table C-3. DAC Unipolar Output Modes . . . . . . . . . . . . . . . C-9

Table C-4. Logic State of Status Register A; MUX (Bit 5). C-10
Table C-5. Logic State of Status Register A; UB (Bit 6) . . C-10
Table C-6. Control Register: Pacer Clock Source Selection C-11
Table C-7. Control Register: Interrupt Level Selection

Bits 4, 5, and 6. . . . . . . . . . . . . . . . . . . . . . . . . . C-12

Table C-8. Gain Selection/Burst Rate Register:

Gain Selection Bits 0 and 1 . . . . . . . . . . . . . . . . C-15

Table C-9. Counter/Timer Address Map. . . . . . . . . . . . . . . C-18

Table C-10. 82C54 Counter/Timer Control Register:

Selecting Functionality . . . . . . . . . . . . . . . . . . . C-23

Table C-11. 82C54 Counter/Timer Control Register:

Bits 4 and 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-24

Table C-12. 82C54 Counter/Timer Control Register:

Readback Command . . . . . . . . . . . . . . . . . . . . . C-25

Table C-13. Counter Status Byte Selection: Bits 0, 1, and 2. C-26

Table C-14. PPI Register Address Map. . . . . . . . . . . . . . . . . C-28

Table C-15. Mode Selection for Ports A and CH . . . . . . . . . C-30

Table C-16. PIO Control Word . . . . . . . . . . . . . . . . . . . . . . . C-30

ix

Preface

This guide describes how to set up, install, and operate the following
Keithley products:

0

The DAS-1601 and DAS-1602 boards, which are referred to

as

collectively
The DAS-1401 and DAS-1402 boards, which are referred to

0

collectively as DAS-1400 Series boards.

DAS-1600 Series boards.

Unless this manual refers specifically to a particular board,
models collectively as the DAS-1600/1400 Series boards.

To

follow the information and instructions contained in this manual, you

must be familiar with the operation of an

(3.x,

computer in the WindowsTM
also be familiar with data acquisition principles and the requirements of
your applications.

95/98,

IBM@

or

PC

NT)

environment.

AT@, or equivalent

it

refers

You

to

must

all

X

Manual Oraanization

The following table lists the topics this guide focuses on and indicates
where you can find information about a topic.

1

Installing the DAS-1600/1400 Series standard software package

I

1

Setting up switch-selectable options

Chapter

I

Chapter

3

3

I

Installing your boards

I/O

Using the DriverLINX Analog
and data acquisition

I

Calibrating the board

I

Troubleshooting and obtaining technical support

I

DAS-

1600/1400

1

I/O

connector pin assignments

The register level

CE

Mark information

xi

Series specifications Appendix A

-

VO

map

Panel software for test

Chapter

1

Chapter

Chapter

I

Chapter

1

Appendix

j

Appendix
Appendix

3

5

6

7

B

C

D

I

I

Related Documents

You can find more information on

accessories in the related documents listed in the following table.

I

EXP-

16

&

EXP-

16/A

Expansion Multiplexer/Amplifier System User’s Guide

I

EXP-GP

1

SSH-4/A Simultaneous Sample & Hold Module User’s Guide

SSH-8

I

ISO-4

EXP-800/1600

Signal Conditioning Multiplexer User’s Guide

User’s Guide

User’s Guide

User’s Guide

DAS-1600/1400

Document

Series software and

I

I

I
I

xii

1

Overview

The DAS-1600/1400 Series is a family of high-performance analog
and digital I/O boards with DriverLINX software requiring:

an IBM PC or compatible AT (386, or Pentium CPU) with 2 MB

●

of memory.

●

at least one floppy disk drive, and one fixed disk drive.

●

MS-DOS/PCDOS 3.1 or higher.

●

Microsoft Windows 3.x or Windows 95/98.
a compiler supporting Microsoft Windows development.

●

a mouse is highly recommended.

●

The DAS-1601 and D AS-1401 are high-gain boards, while the D AS-1602
and DAS-1402 are low-gain boards.

This chapter describes features of the DAS-1600/1400 Series boards, the
software that supports them, and available accessories.

Features

Features shared by the DAS-1600 Series and DAS-1400 Series are
as follows:

Boards are switch-configurable for 16 single-ended or eight

●

differential analog input channels.

●

Analog inputs are switch-configurable for either unipolar (0 to
10 V) or bipolar (±10 V) signals.

Features 1-1

Analog input channels are individually programmable for gain. The

●

DAS-1601/1401 boards have programmable gains of 1, 10, 100, and

500. The DAS-1602/1402 boards ha v e programmable gains of 1, 2, 4,
and 8.

Analog input sampling is a maximum of 100 ksamples/s with

●

12-bit resolution.
The base I/O address and Direct Memory Address (DMA) channel

●

are switch-configurable; interrupt levels are software-configurable.
Burst mode sampling capability emulates simultaneous

●

sample-and-hold (SSH) operation.
Analog-to-digital (A/D) conversions run by any of the

●

following methods:
– software command
– onboard pacer clock
– external pacer clock
External SSH hardware is supported.

●

Data transfers can run by any of the following methods:

●

– program control
– interrupt service routines
– DMA transfer

●

The boards perform 8-bit data transfers on the ISA bus.

●

A 3-channel programmable counter/timer (82C54) provides timing
for analog input operations or generation of output pulses at any rate
from 1 pulse/hour to 100 kHz. The 82C54 counter/timer can also be
used to measure frequency, period, and pulse width.

The boards have four unidirectional digital inputs and four

●

unidirectional digital outputs.

●

The boards are backward compatible with the DAS-16G1 and
DAS-16G2 boards.

Programs for the DAS-16G1 and DAS-16G2 boards run on the
DAS-1600 Series without modification. The DAS-1400 Series
maintains backward compatibility with the analog input section
of the DAS-16G1.

1-2 Overview

DAS-1600 Series boards provide the following additional features:

Two 12-bit digital-to-analog converter (DAC) channels. The

●

outputs of these channels have switch-configurable output ranges of
0 to 5 V, 0 to 10 V, ±5 V, and ±10 V full scale. In addition, you can
apply an external reference to provide analog outputs in other
ranges or to use the DACs as programmable attenuators.

An additional 24 bits of bidirectional digital I/O by way of the PIO

●

cable connector (J2). These 24 bits are configured as two 8-bit ports
and two 4-bit ports that you can set independently for input or output.

The 24-bit digital port is compatible with the Keithley MetraByte
PIO-12 board. You can use these ports to gate the counter/timer,
control multiplexers, and read the status of external devices.

For more information on these features, refer to the functional description
in Chapter 2.

Supporting Software

The following software is available for operating DAS-1600/1400
Series boards:

DAS-1600/1400 Series standard software package

●

- Shipped with
DAS-1600/1400 Series boards. Includes DriverLINX® for
Microsoft® Windows and function libraries for writing application
programs under Windows™ in a high-level language such as
Microsoft Visual C++; Microsoft Visual Basic; Borland Delphi

®

;

utility programs; and language-specific example programs.

●

DriverLINX-

the high-performance real-time data-acquisition device

drivers for Windows application development including:
–

DriverLINX API DLLs

and drivers supporting the

DAS-1600/1400 Series hardware

–

Analog I/O Panel -

A DriverLINX program that verifies the
installation and configuration of DriverLINX to your
DAS-1600/1400 Series board and demonstrates several virtual
bench-top instruments

Supporting Software 1-3

–

Learn DriverLINX -

an interactive learning and demonstration
program for DriverLINX that includes a Digital
Storage Oscilloscope

–

Source Code -

–

DriverLINX Application Programming Interface files -

for the sample programs

for the

DAS-1600/1400 Series compiler

–

DriverLINX On-line Help System -

provides immediate help as

you operate DriverLINX

–

Supplemental Documentation -

on DriverLINX installation and
configuration; analog and digital I/O programming; counter/timer
programming; technical reference; and information specific to the
DAS-1600/1400 Series hardware.

DAS-1600/1400 Series utilities -

●

The following utilities are provided

as part of both the DAS-1600/1400 Series standard software package:
– Calibration Utility
– Test Utility

1-4 Overview

Accessories

The following accessories are available for use with the DAS-1600/1400
Series boards.

●

STA-16 - Screw-terminal adapter accessory that connects to the main

I/O connector of a DAS-1600/1400 Series board through a C-1800
cable.

●

STA-U

- Universal scre w-terminal accessory that connects to the PIO

cable of a DAS-1600/1400 Series board through a C-1800 cable.

●

STC-37

- Direct DAS-1600/1400 Series board to screw

terminal interface.

●

STP-37

- Screw-terminal panel that connects to the main I/O

connector of a DAS-1600/1400 Series board through a C-1800 cable.

●

ISO-4

- 4-channel isolated expansion multiplexer.

●

SSH-4/A

- 4-channel simultaneous sample-and-hold accessory that
connects to the main I/O connector of a DAS-1600/1400 Series board
through a C-1800 cable. You can cascade additional SSH4/A
accessories through CACC-2000 cables.

●

SSH-8 - 8-channel simultaneous sample-and-hold accessory that

connects to the main I/O connector of a DAS-1600/1400 Series board
through a C-1800 cable.

●

MB Series modules and backplanes

- Plug-in, isolated,
signal-conditioning modules and the backplanes that hold them.
Supported backplanes include the MB01, MB02, and MB05.

●

STA-MB

- Screw terminal accessory for MB Series modules. The
STA-MB connects to a DAS-1600/1400 Series board through a
C-1800 cable and contains mounting holes for up to four MB Series
modules. The STA-MB brings all signal lines from the
DAS-1600/1400 Series board and all inputs and outputs from the MB
Series modules out to external screw terminals.

STA-SCM16

●

- Screw terminal accessory that attaches to the main
I/O of a DAS-1600/1400 Series board through a C-1800 cable and
attaches to up four MB02 backplanes through C-2600 cables.

●

EXP-16 and EXP-16/A

- 16-channel expansion multiplexer and
signal conditioning boards; requires the S-1600 cable and the
PG-408A option.

Accessories 1-5

●

PG-408A

is a snap-in DC/DC converter module for an EXP-16 or

EXP-16/A used with a DAS-1600/1400 Series board.

●

EXP-1600

to DAS-1600 Series boards. Refer to the

- 16-channel expansion accessory that connects directly

EXP-1600 User’s Guide

more information.

●

SSIO-24

- 24-channel mounting panel for up to 24 solid-state,
miniature I/O modules with functions of DC input, DC output, AC
input, and AC output. The SSIO-24 connects to the PIO cable of a
DAS-1600/1400 Series board through a C-1800 cable.

for

●

ERB-24

- electrical relay board. This accessory provides 24
electromechanical double-pole, double-throw relays for controlling
and switching up to 3 A at 120 V

. The ERB-24 connects to the PIO

rms

cable of a DAS-1600/1400 Series board through a C-1800 cable.

●

C-1800

- Cable for attaching the main I/O connector of a
DAS-1600/1400 Series board to an STA-16, ST A-MB, STA-SCM-16,
STP-37, SSH8, or SSH4/A accessory. This cable can also be used to
connect the PIO cable of a DAS-1600 Series board to an STA-U,
SSIO-24, ERB-24 accessory, or to cascade additional EXP-GP,
EXP-16, or ISO-4 accessories.

S-1800

●

●

CACC-2000

●

S-1600

- Shielded version of the C-1800 cable.

- Cable for cascading additional SSH-4/A accessories.

- Cable for attaching an STA-16 or STA-MB to an EXP-16,

EXP-GP, or ISO-4 accessory.

●

CAB-3740

- Cable for attaching the main I/O connector of a

DAS-1600/1400 Series board to an EXP-1600 accessory.

●

CAB-40/1
C-16MB1

●

- Cable for cascading additional EXP-1600 accessories.

- Cable for attaching the main I/O connector of a

DAS-1600/1400 Series board to an MB01/05 backplane.

●

C-2600

- Cable for attaching an STA-SCM16 to an MB02 backplane.

1-6 Overview

2

Functional Description

This chapter describes the following features of DAS-1600/1400
Series boards:

Analog input

●

Analog output

●

●

Digital I/O

●

82C54 counter/timer
Wait state selection

●

●

Power

These descriptions are offered to familiarize you with the operating
options and to enable you to make the best use of your board. The block
diagram in Figure 2-1 represents both the DAS-1600 and DAS-1400
Series boards.

2-1

diff./S.E.

ch 0/0

ch 7/15

DAS1600 Series only

D/A 0

ref in

D/A 0

out

D/A 1

out

D/A 1

ref in

selection

8 or 16

analog

input

channels

10 V, 5 V or user

selection

DAC 0 12-bit

multiplying D/A

unipolar/bipolar

selection

DAC 1 12-bit

multiplying D/A

10 V, 5 V or user

selection

unipolar/bipolar

selection

instrumentation

amplifier

gain

selection

data

buffers

mux increment
& control logic

internal data bus

control

register

address decode

& select

sampling

12-bit ADC

ADC & mux
data register

register

clock
select

logic
timer

enable

register

control logic

DMA

level select

status

DMA

DAS1600 Series only

port a
port b

port cl
port ch

output

register

register

100 kHz

interrupt control

logic

4-bit

4-bit

input

16-bit
counter

16-bit
counter

16-bit
counter

1 MHz

8 bits
8 bits
4 bits

4 bits

op3
op2

op1
op0

ip3
ip2/cntr 0 gate
ip1/xtrig
ip0/trig 0/xpclk

cntr 0

out

programmable
interval timer

cntr 2

out

cntr 0
clk in

10 MHz

ISA PC AT, PC/XT BUS

Figure 2-1. Functional Block Diagram

Analog Input Features

The analog input section of a DAS-1600/1400 Series board multiplexes
all the active input channels (up to 16 single-ended or eight differential)
into a single, 12-bit, sampling, analog-to-digital converter (ADC).

Other features of this section include input configurations, gain selection,
conversion modes, triggers, clock sources, and data transfer modes. These
features are described in the following subsections.

2-2 Functional Description

Differential/Single-Ended Selection

Using configuration switches, you can select either eight differential or 16
single-ended inputs. Differential inputs measure the difference between
two signals. Single-ended inputs are referred to a common ground.

Generally, you want to use differential inputs for low-level signals whose
noise component is a significant part of the signal or for signals that have
nonground common mode. You want to use single-ended inputs for
high-level signals whose noise component is not significant.

The specific level at which input configurations work best depends on the
application. However, you generally use differential inputs for voltage
ranges of 100 mV and less.

Unipolar/Bipolar Selection

Using configuration switches, you can set the DAS-1600/1400 Series
boards to operate in either unipolar or bipolar input mode. A unipolar
signal is always positive (0 to 10 V, for example), while a bipolar signal
can swing up and down between negati ve and positi v e peak v alues (
to +10 V, for example).

−

10 V

The DAS-1600/1400 Series boards use left-justified, offset binary to
represent signals. In a given input range with the same peak-voltage
capacity for both modes, unipolar mode doubles the converter’s
resolution.

Channel Selection in Expanded Configurations

As previously mentioned, the DAS-1600/1400 Series supports 16
single-ended or eight differential analog input channels. If you require
additional analog input channels or signal conditioning for transducer
inputs, you can attach EXP-16, EXP-16/A, EXP-GP, or EXP-1600
expansion accessories. Attaching any combination of up to eight
16-channel EXP-16 or EXP-16/A accessories, and/or eight 8-channel
EXP-GP accessories can increase the number of available channels to

128. Attaching up to sixteen 16-channel EXP-1600 accessories can
increase the number of available channels to 256.

Analog Input Features 2-3

When you daisy-chain expansion boards from the analog inputs, you are
advised to make the first expansion board multiplex onboard channel 0,
the next expansion board multiplex channel 1, and so on. You select an
onboard channel using jumper settings on the expansion board.

You can access any unused onboard channels by placing an ST A-16 screw
terminal accessory first in the daisy-chain configuration. Figure 2-2
illustrates how expansion boards and accessories interface with the analog
channels of DAS-1600/1400 Series boards.

DAS-1600/1400
Series Boards

ch 0
ch 1

ch 2

Transducer

16 multiplexed input
channels

8 multiplexed input
channels

.

.

ch 7

digital output

port

Expansion Channel
Select Lines (OP0 to 3)

Figure 2-2. Expanding the Analog Inputs of DAS-1600/1400 Series Boards

EXP-16,
EXP-16/A
EXP-1600

You can also use up to four MB02 backplanes to increase the number of
available channels to 64 isolated or 12 nonisolated. For more information
about connecting channel expansion boards, refer to Chapter 4.

EXP-GPSTA-16

Notes:

You must specify a single-ended input configuration for all

onboard channels associated with channels on MB02 backplanes.

If you are using EXP-16, EXP-16/A, EXP-GP, or EXP-1600 expansion
accessories or MB Series backplanes, the digital output lines of the
DAS-1600/1400 Series board select a particular channel on the expansion
board or backplane to read.

2-4 Functional Description

Gain Selection

The programmable gain you select is applied to an incoming signal as a
multiplication factor; gain allows you to amplify a signal to a range that
the ADC can accurately measure.

For example, if the ADC handles signals in the ±10 V range and you want
to measure a signal in the range of ±1.0 V, you would use a gain of 10 to
amplify the signal to the ±10 V range. Similarly, if you wanted to measure
a signal that was already in the ±10 V range, you would select a gain of 1.

The available gains, their corresponding input ranges, and throughput
rates are listed in Table 2-1 for the DAS-1601/1401 and Table 2-2 for the
DAS-1602/1402.

Table 2-1. DAS-1601/1401 Gains, Ranges, and Throughput

Rates for Unipolar and Bipolar Selections

Maximum

Gain Unipolar Range Bipolar Range

Throughput

Rate

1 0.0 to +10.0 V

10 0.0 to +1.0 V
100 0.0 to +100 mV
500 0.0 to +20 mV

−

10.0 to +10.0 V 100 ksamples/s

−

1.0 to +1.0 V 100 ksamples/s

−

100 to +100 mV 70 ksamples/s

−

20 to +20 mV 30 ksamples/s

Table 2-2. DAS-1602/1402 Gains, Ranges, and Throughput

Rates for Unipolar and Bipolar Selections

Maximum

Gain Unipolar Range Bipolar Range

1 0.0 to +10.0 V
2 0.0 to +5.0 V
4 0.0 to 2.5 V
8 0.0 to 1.25 V

Analog Input Features 2-5

−

10 to +10 V 100 ksamples/s

−

5.0 to +5.0 V 100 ksamples/s

−

2.5 to + 2.5 V 100 ksamples/s

−

1.25 to +1.25 V 100 ksamples/s

Throughput

Rate

Conversion Modes

DAS-1600/1400 Series boards support the following conversion modes:

Paced mode

●

- Paced mode is the default data con v ersion mode and is
the mode best-suited for continuous scanning of multiple channels at
a constant rate. In paced mode, the conversion rate equals the pacer
clock rate. The sample rate, which is the rate at which a single
channel is sampled, is the pacer clock rate divided by the number of
channels sampled.

●

Burst mode

- In burst mode, each pulse from the pacer clock begins a
scan of one to 16 channels. The conversion rate during a burst mode
scan is equal to the rate of the burst mode conversion clock. The
sample rate, which is the rate at which a single channel is sampled, is
equal to the pacer clock rate.

DAS-1600/1400 Series software allows you to program the pacer
clock to adjust the interval between burst mode scans. This software
also allows you to adjust the burst mode conversion rate. The burst
mode conversion clock frequency is programmable for a range of

3.94 kHz to 100 kHz.
DAS-1600/1400 Series boards support burst mode only during DMA

operations. You can also use burst mode for pseudo-simultaneous
sample-and-hold in conjunction with DMA operations.

The sample rate (pacer clock rate) should be set for no more than the
burst mode conversion clock rate divided by the number of channels
in the burst. The maximum burst mode conversion clock rate is
gain-sensitive, as shown in Table 2-1 and Table 2-2.

Figure 2-3 shows the timing relationships of the paced and burst modes
for analog input channel 4 to channel 7.

2-6 Functional Description

Pacer Clock

Paced Mode Conversions

Burst Mode Conversions

Burst Mode Conversion Clock

Figure 2-3. Timing Relationships of Conversion Modes

Clock Sources

CH4

CH4

CH5

CH6

CH7

CH5

CH4 CH5

CH6

CH7

The following clock sources are available for conversions on
DAS-1600/1400 Series boards:

●

Software

- DAS-1600/1400 Series boards allo w you to acquire single

or multiple samples under program control.

Hardware (internal clock source)

●

- The internal pacer clock is
derived from the onboard 82C54 counter/timer and a
switch-configurable, crystal-controlled 1 MHz or 10 MHz timebase.
The pacer clock uses two cascaded counters of the 82C54. The
maximum allowable rate is 100 ksamples/s, and the minimum
conversions per hour is determined as follows:

10MHz

------------------ 2.328 103–× 8.38==

32

2

1MHz

--------------- 2.328 104–× 0.838==

32

2

When not used to pace the analog input, the internal clock source can
pace other events, such as digital I/O and analog outputs (on the
DAS-1600 Series boards), through the use of interrupts.

●

Hardware (external clock sour ce)

- The external pacer clock source
must be an externally applied, TTL-compatible, rising-edge signal
attached to the IP0/TRIG 0/XPCLK pin (25) of the main I/O
connector (J1).

Analog Input Features 2-7

An external clock source is useful if you want to pace at rates not
available with the 82C54 counter/timer, if you want to pace at uneven
intervals, or if you want to pace on the basis of an external event. An
external clock also allows you to synchronize multiple boards with a
common timing source.

Triggers

Notes:

The ADC acquires samples at a maximum of 100 ksamples/s (one
sample every 10.0 µs). If you are using an external clock, make sure it
does not initiate conversions at a faster rate than the ADC can handle.

If you are acquiring samples from multiple channels, the maximum
sampling rate for each channel is equal to 100 ksamples/s divided by the
number of channels.

A trigger starts an analog input operation. The polarity of external triggers
in the DAS-1600/1400 Series boards is software-configurable. You can
use one of the following trigger sources to start an analog input operation:

●

Internal

- When you enable the analog input operation, conversions

begin immediately.

●

External Analog

- While an analog trigger is not a hardware feature
of the DAS-1600/1400 Series boards, you can program an analog
trigger using one of the analog input channels as the trigger channel.
DriverLINX provides functions for an analog trigger; refer to the

DriverLINX Installation and Configuration Guide

and

Appendix F:
Configuration and Implementation Notes—for Keithley MetraByte
DAS-16/1600

manuals for more information.

●

External Digital

- While a digital trigger is not a hardware feature of
the DAS-1600/1400 Series boards, you can apply a digital trigger to
the digital input IP1/XTRIG pin (6) of the main I/O connector (J1).
Refer to the

DriverLINX Installation and Configuration Guide

and

Appendix F: Configuration and Implementation Notes—For Keithley
MetraByte DAS-16/1600

manuals.
Trigger types are as follows:
–

Positive-edge trigger

- Conversions begin on the rising edge of

the trigger signal.

2-8 Functional Description