Data Translation DT9871 User manual

User’s Manual for

UM-23654-Z

Standard TEMPpoint, VOLTpoint,

and MEASURpoint USB

Title Page

Instruments

DT9871, DT9871U, DT9872, DT9873, DT9874

Trademark and Copyright Information

Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement

Computing logo are either trademarks or registered trademarks of Measurement Computing

Corporation. Refer to the Copyrights & Trademarks section on mccdaq.com/legal for more

information about Measurement Computing trademarks.

Other product and company names mentioned herein are trademarks or trade names of their

respective companies.

may be reproduced, stored in a retrieval system, or transmitted, in any form by any means,

electronic, mechanical, by photocopying, recording, or otherwise without the prior written

permission of Measurement Computing Corporation.

Notice

Measurement Computing Corporation does not authorize any Measurement Computing

Corporation product for use in life support systems and/or devices without prior written consent

from Measurement Computing Corporation. Life support devices/systems are devices or systems

that, a) are intended for surgical implantation into the body, or b) support or sustain life and whose

failure to perform can be reasonably expected to result in injury. Measurement Computing

Corporation products are not designed with the components required, and are not subject to the

testing required to ensure a level of reliability suitable for the treatment and diagnosis of people.

Radio and Television Interference

This equipment has been tested and found to comply with CISPR EN55011 Class A and

EN61326-1 requirements and also with the limits for a Class A digital device, pursuant to Part

15 of the FCC Rules. These limits are designed to provide reasonable protection against

harmful interference when the equipment is operated in a commercial environment. This

equipment generates, uses, and can radiate radio frequency energy and, if not installed and

used in accordance with the instruction manual, may cause harmful interference to radio

communications. Operation of this equipment in a residential area is likely to cause harmful

interference, in which case the user will be required to correct the interference at his own

expense.

Changes or modifications to this equipment not expressly approved by Data Translation could

void your authority to operate the equipment under Part 15 of the FCC Rules.

Note: This product was verified to meet FCC requirements under test conditions that

included use of shielded cables and connectors between system components. It is important

that you use shielded cables and connectors to reduce the possibility of causing interference

to radio, television, and other electronic devices.

Canadian Department of Communications Statement

This digital apparatus does not exceed the Class A limits for radio noise emissions from

digital apparatus set out in the Radio Interference Regulations of the Canadian Department of

Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites

applicables aux appareils numériques de la class A prescrites dans le Règlement sur le

brouillage radioélectrique édicté par le Ministère des Communications du Canada.

FCC

Page

Table of Contents

About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Intended Audience. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

How this Manual is Organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Conventions Used in this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Related Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Where To Get Help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chapter 1: Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

TEMPpoint Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

VOLTpoint Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

MEASURpoint Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Supported Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Getting Started Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Part 1: Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter 2: Preparing to Use the

Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Checking the System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Installing the Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Viewing the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Chapter 3: Setting Up and Installing

the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Attaching the Instrument to the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Connecting Directly to the USB Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Connecting to an Expansion Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Configuring the Device Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Chapter 4: Wiring Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

General Wiring Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Warm-Up Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Connecting Thermocouple Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Connecting RTD Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

4-Wire RTD Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

3-Wire RTD Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

2-Wire RTD Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Table of Contents

Contents

Connecting Voltage Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Connecting Voltage Inputs to Thermocouple Channels . . . . . . . . . . . . . . . . . . . . . . . . . 51

Connecting Voltage Inputs to RTD Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Connecting Voltage Inputs to Voltage Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Connecting Current Loop Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Connecting Current Loop Inputs to Thermocouple Channels. . . . . . . . . . . . . . . . . . . . 56

Connecting Current Loop Inputs to RTD Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Connecting Current Loop Inputs to Voltage Channels . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Connecting Digital I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Connecting Digital Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Connecting Digital Output Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Chapter 5: Verifying the Operation

of Your Instrument. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Select the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Configure the Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Configure the Parameters of the Acquisition Config Window . . . . . . . . . . . . . . . . . . . . . . . 70

Configure the Appearance of the Channel Display Window . . . . . . . . . . . . . . . . . . . . . . . . 72

Configure the Appearance of the Channel Plot Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Configure the Appearance of the Statistics Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Position the Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Start the Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Part 2: Using Your Instrument. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Chapter 6: Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

DT9871U Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

DT9871 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

DT9872 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

DT9873 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

DT9874 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Analog Input Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Analog Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Thermocouple Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Open Thermocouple Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

RTD Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Input Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Out of Range Data for Thermocouple Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Out of Range Data for RTD Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Contents

Out of Range Data for Voltage Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Sample Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Trigger Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Conversion Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Specifying Analog Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

How Continuous Scan Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Data Format for Thermocouple Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Data Format for RTD Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Data Format for Voltage Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Digital I/O Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Digital Input Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Digital Output Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Channel-to-Channel Functional Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Operation Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Chapter 7: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

General Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

If Your Instrument Needs Factory Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Basic Instrument Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Thermocouple Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

System Temperature Error for the DT9871U and DT9874 . . . . . . . . . . . . . . . . . . . . . . 112

System Temperature Error for the DT9871 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

RTD Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Temperature Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Voltage Measurement Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Isolation and Protection Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Memory Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Digital I/O Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Power, Physical, and Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Regulatory Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Connector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Thermocouple Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

RTD Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Contents

Voltage Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

External Power Supply Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Appendix B: Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

About this Manual

TEMPpoint™ is a family of temperature measurement instruments that includes the DT9871,

DT9871U, DT8871, DT8871U, DT9872, and DT8872. This manual describes the DT9871,

DT9871U, and DT9872 USB models.

VOLTpoint™ is a family of voltage measurement instruments that includes the DT9873 and

DT8873. This manual describes the DT9873 USB model.

MEASURpoint™ a family of mixed temperature and voltage measurement instruments that

includes the DT9874 andDT8874. This manual describes the DT9874 USB model.

Note: For information on the DT8871U, DT8871, DT8872, DT8873, and DT8874 LXI models

of TEMPpoint, VOLTpoint, and MEASURpoint, refer to the User’s Manual for Standard

TEMPpoint, VOLTpoint, and MEASURpoint LXI Instruments.

The first part of this manual describes how to install and set up your instrument, and verify

that the instrument is working properly.

The second part of this manual describes the features and capabilities of your instrument

using the IVI-COM instrument driver software. Troubleshooting information is also provided.

Note: If you are programming the instrument using the IVI-COM driver, refer to the

DtxMeasurement IVI-COM driver online help for more information.

Intended Audience

This document is intended for engineers, scientists, technicians, or others responsible for

using and/or programming a TEMPpoint, VOLTpoint, or MEASURpoint instrument in the

Microsoft® Windows® XP, Windows Vista®, Windows 7, or Windows 8 operating system. It is

assumed that you have some familiarity with thermocouples, RTDs, and/or voltages and that

you understand your application.

About this Manual

How this Manual is Organized

This manual is organized as follows:

•Chapter 1, “Overview,” summarizes the major features of the TEMPpoint, VOLTpoint,

and MEASURpoint instruments, as well as the supported software and accessories.

•Chapter 2, “Preparing to Use the Instrument,” describes how to unpack the instrument,

check the system requirements, install the software, and view the documentation online.

•Chapter 3, “Setting Up and Installing the Instrument,” describes how to apply power to

the instrument and connect the instrument to your computer.

•Chapter 4, “Wiring Signals,” describes how to wire signals to the instrument.

•Chapter 5, “Verifying the Operation of Your Instrument,” describes how to verify the

operation of the instrument.

•Chapter 6, “Principles of Operation,” describes the analog input and digital I/O features

of the TEMPpoint, VOLTpoint, and MEASURpoint instruments in detail.

•Chapter 7, “Troubleshooting,” provides information that you can use to resolve problems

with your instrument, should they occur.

•Appendix A, “Specifications,” lists the specifications of the TEMPpoint, VOLTpoint, and

MEASURpoint instruments.

•Appendix B, “Connector Pin Assignments,” describes the pin assignments of the digital

I/O connector on the TEMPpoint, VOLTpoint, and MEASURpoint instruments.

• An index completes this manual.

Conventions Used in this Manual

The following conventions are used in this manual:

• Notes provide useful information or information that requires special emphasis, cautions

provide information to help you avoid losing data or damaging your equipment, and

warnings provide information to help you avoid catastrophic damage to yourself or your

equipment.

• Items that you select or type are shown in bold.

• CAUTION – This icon denotes a caution, which advises you to consult the

documentation where this symbol is marked.

CAUTION – Do not operate this product in a manner not specified in this document.

Product misuse can result in a hazard. You can compromise the safety protection built into

the product if the product is damaged in any way.

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