Data Translation DT9871, DT9871U, DT9872, DT9873, DT9874 User Manual

Download

Page 1

Title Page

UM-23654-Z

User’s Manual for Standard TEMPpoint, VOLTpoint, and MEASURpoint USB Instruments

DT9871, DT9871U, DT9872, DT9873, DT9874

Page 2

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.

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.

© 2018 Measurement Computing Corporation. All rights reserved. No part of this publication 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.

Page 3

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.

FCC Page

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.

Page 4

Page 5

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

Page 6

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

Page 7

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

Contents

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

Page 8

Contents

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

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

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

Page 9

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.

Page 10

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.

Page 11

Related Information

Refer to the following documents for more information on using a TEMPpoint, VOLTpoint, or MEASURpoint USB instrument:

• DtxMeasurement IVI-COM Driver online help. This document describes how to use the IVI-COM driver to access the capabilities of a TEMPpoint, VOLTpoint, or MEASURpoint instrument.

The IVI-COM driver works with any development environment that supports COM programming, including MATLAB® from The MathWorks or Visual Basic®.NET, Agilent® VEE Pro, National Instruments™ LabVIEW™ or LabWindows™, and so on.

• QuickDAQ User’s Manual (UM-25242). This manual describes how to create a QuickDAQ application to acquire and analyze data from a TEMPpoint, VOLTpoint, or MEASURpoint instrument.

• IVI foundation (www.ivifoundation.org)

• Omega Complete Temperature Measurement Handbook and Encyclopedia® or the Omega Engineering web site: http://www.omega.com. Both resources provide valuable information on thermocouple types, RTD types, standards, and linearization.

About this Manual

, Microsoft® Visual C#®.NET

Where To Get Help

Should you run into problems installing or using a TEMPpoint, VOLTpoint, or MEASURpoint instrument, the Data Translation Technical Support Department is available to provide technical assistance. Refer to Chapter 7 for more information. If you are outside the United States or Canada, call your local distributor, whose number is listed on our web site (www.mccdaq.com).

Page 12

About this Manual

Page 13

Overview

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

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

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

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

Page 14

Chapter 1

Hardware Features

Data Translation provides a number of USB instruments to meet your measurement needs, including the following:

• TEMPpoint – a family of temperature measurement instruments

• VOLTpoint – a family of voltage measurement instruments

• MEASURpoint – a family of mixed temperature and voltage measurement instruments

All of these instruments support Version 2.0 and 1.1 of the USB bus.

The following sections summarize the features of the TEMPpoint, VOLTpoint, and MEASURpoint USB instruments.

TEMPpoint Features

TEMPpoint instruments include the following models: DT9871U, DT9871, and DT9872.

Figure 1 shows a DT9871U instrument.

Figure 1: TEMPpoint Instrument

The key features of TEMPpoint instruments are as follows:

• DT9871U and DT9871:

 Configurable analog input channels for thermocouple or differential voltage inputs;

easy-access jacks for each channel for quick wiring

 One CJC (cold junction compensation) input for each thermocouple channel

Page 15

 B, E, J, K, N, R, S, and T thermocouple types supported; the instrument automatically

linearizes the measurements and returns the data as a 32-bit, floating-point temperature values

 Input range of ±0.075 V for the DT9871U (with 0.25 V RMS A/D noise using no

software filtering) and ±1.25 V for the DT9871 (with 5 V RMS A/D noise using no software filtering)

 Break-detection circuitry to detect open thermocouple inputs

• DT9872:

 Configurable analog input channels for RTDs and differential voltage inputs;

easy-access jacks for each channel for quick wiring

 100 , 500 , and 1000  platinum RTD types supported using alpha curves of 0.00385

(European) or 0.00392 (American)

 4-wire, 3-wire, or 2-wire configurations; the DT9872 automatically linearizes the

measurements and returns the data as 32-bit, floating-point temperature, resistance, or voltage values

 Input range of ±1.25 V

• One 24-bit, Delta-Sigma A/D converter per channel for simultaneous, high-resolution measurements

Overview

• Throughput rate of up to 10 Samples/s for all channels.

• Software or external, digital trigger on digital input line 0 starts acquisition

• Auto-calibrating front-end resets the zero point on each power-up; in addition, the instrument supports anytime calibration, performing an auto-calibration function on software command

• Measurement Calibration Utility allows you to calibrate the instrument in the field (see

page 20 for more information on this utility)

• 8 opto-isolated digital input lines; you can read the digital input port through the analog input data stream for correlating analog and digital measurements

• 8 opto-isolated digital output lines; the outputs are solid-state relays that operate from ±30 V at currents up to 400 mA (peak) AC or DC

Page 16

Chapter 1

VOLTpoint Features

Figure 2 shows a VOLTpoint instrument.

Figure 2: VOLTpoint Instrument

The key features of VOLTpoint (DT9873) instruments are as follows:

• Direct connection of analog input channels for differential voltage inputs; removable screw terminal blocks for each channel for quick wiring

• One 24-bit, Delta-Sigma A/D converter per channel for simultaneous, high-resolution measurements

• Software-selectable input range of ±10 V or ±60 V per channel (note that for the ±60 V range, no more than 30 Vrms, 42.4 Vpk, 60 VDC is allowed)

• Throughput rate of up to 10 Samples/s for all channels

• Software or external, digital trigger on digital input line 0 starts acquisition

• Auto-calibrating front-end resets the zero point on each power-up; in addition, the instrument supports anytime calibration, performing an auto-calibration function on software command

• Measurement Calibration Utility allows you to calibrate the instrument in the field (see

page 20 for more information on this utility)

• 8 opto-isolated digital input lines; you can read the digital input port through the analog input data stream for correlating analog and digital measurements

• 8 opto-isolated digital output lines; the outputs are solid-state relays that operate from ±30 V at currents up to 400 mA (peak) AC or DC

Page 17

MEASURpoint Features

The standard MEASURpoint (DT9874) instrument provides 16 thermocouple channels, 16 RTD channels, and 16 voltage channels. Figure 3 shows a MEASURpoint instrument.

Overview

Figure 3: MEASURpoint Instrument

The key features of MEASURpoint instruments are as follows:

• Analog Input Channels 0 to 15:

 Configurable channels for thermocouple or differential voltage inputs; easy-access

jacks for each channel for quick wiring

 One CJC (cold junction compensation) input for each thermocouple channel

 B, E, J, K, N, R, S, and T thermocouple types supported; the instrument automatically

linearizes the measurements and returns the data as a 32-bit, floating-point temperature values

 Input range of ±0.075 V (with 0.25 V RMS A/D noise using no software filtering)

 Break-detection circuitry to detect open thermocouple inputs

• Analog Input Channels 16 to 31:

 Configurable analog input channels for RTDs and differential voltage inputs;

easy-access jacks for each channel for quick wiring

 100 , 500 , and 1000  platinum RTD types supported using alpha curves of 0.00385

(European) or 0.00392 (American)

Page 18

Chapter 1

 4-wire, 3-wire, or 2-wire configurations; the DT9872 automatically linearizes the

measurements and returns the data as 32-bit, floating-point temperature, resistance, or voltage values

 Input range of ±1.25 V

• Analog Input Channels 31 to 48:

 Direct connection of analog input channels for differential voltage inputs; removable

screw terminal blocks for each channel for quick wiring

 Software-selectable input range of ±10 V or ±60 V (note that for the ±60 V range, no

more than 30 Vrms, 42.4 Vpk, 60 VDC is allowed)

• One 24-bit, Delta-Sigma A/D converter per channel for simultaneous, high-resolution measurements

• 30 VAC, 60 VDC continuous functional isolation ch-ch and ch-gnd, verified by a 500 Vpk withstand

• Throughput rate of up to 10 Samples/s for all channels

• Software or external, digital trigger on digital input line 0 starts acquisition

• Auto-calibrating front-end resets the zero point on each power-up; in addition, the instrument supports anytime calibration, performing an auto-calibration function on software command

• Measurement Calibration Utility allows you to calibrate the instrument in the field (see

page 20 for more information on this utility)

• 8 opto-isolated digital input lines; you can read the digital input port through the analog input data stream for correlating analog and digital measurements

• 8 opto-isolated digital output lines; the outputs are solid-state relays that operate from ±30 V at currents up to 400 mA (peak) AC or DC

Page 19

Supported Software

The following software is available for use with the TEMPpoint, VOLTpoint, and MEASURpoint USB instruments:

• QuickDAQ Base Version – The base version of QuickDAQ is free-of-charge and allows you to acquire and analyze data from all Data Translation USB and Ethernet devices, except the DT9841 Series, DT9817, DT9835, and DT9853/54. Using the base version of QuickDAQ, you can perform the following functions:

 Discover and select your devices.

 Configure all input channel settings for the attached sensors.

 Load/save multiple hardware configurations.

 Generate output stimuli (fixed waveforms, swept sine waves, or noise signals).

 On each supported data acquisition device, acquire data from all channels supported

in the input channel list.

 Choose to acquire data continuously or for a specified duration.

 Choose software or triggered acquisition.

Overview

 Log acquired data to disk in an .hpf file.

 Display acquired data during acquisition in either a digital display using the Channel

Display window or as a waveform in the Channel Plot window.

 Choose linear or logarithmic scaling for the horizontal and vertical axes.

 View statistics about the acquired data, including the minimum, maximum, delta, and

mean values and the standard deviation in the Statistics window.

 Export time data to a .csv or .txt file; you can open the recorded data in Microsoft

Excel® for further analysis.

 Read a previously recorded .hpf data file.

 Customize many aspects of the acquisition, display, and recording functions to suit

your needs, including the acquisition duration, sampling frequency, trigger settings, filter type, and temperature units to use.

• QuickDAQ FFT Analysis Option – When enabled with a purchased license key, the QuickDAQ FFT Analysis option includes all the features of the QuickDAQ Base version plus these features:

 The ability to switch between the Data Logger time-based interface and the FFT

Analyzer block/average-based interface.

 Supports software, freerun, or triggered acquisition with accept and reject controls for

impact testing applications.

 Allows you to perform single-channel FFT (Fast Fourier Transform) operations,

including AutoSpectrum, Spectrum, and Power Spectral Density, on the acquired analog input data. You can configure a number of parameters for the FFT, including the FFT size, windowing type, averaging type, integration type, and so on.

 Allows you to display frequency-domain data as amplitude or phase.

Page 20

Chapter 1

 Supports dB or linear scaling with RMS (root mean squared), peak, and peak-to-peak

scaling options

 Supports linear or exponential averaging with RMS, vector, and peak hold averaging

options.

 Supports windowed time channels.

 Supports the following response window types: Hanning, Hamming, Bartlett,

Blackman, Blackman Harris, and Flat top.

 Supports the ability to lock the waveform output to the analysis frame time.

 Allows you to configure and view dynamic performance statistics, including the input

below full-scale (IBF), total harmonic distortion (THD), spurious free dynamic range (SFDR), signal-to-noise and distortion ratio (SINAD), signal-to-noise ratio (SNR), and the effective number of bits (ENOB), for selected time-domain channels in the Statistics window.

 Supports digital IIR (infinite impulse response) filters.

• QuickDAQ Advanced FFT Analysis Option – When enabled with a purchased software license, the QuickDAQ Advanced FFT Analysis option includes all the features of the QuickDAQ Base version with the FFT Analysis option plus these features:

 Allows you to designate a channel as a Reference or Response channel.

 Allows you to perform two-channel FFT analysis functions, including Frequency

Response Functions (Inertance, Mobility, Compliance, Apparent Mass, Impedance, Dynamic Stiffness, or custom FRF) with H1, H2, or H3 estimator types, Cross-Spectrum, Cross Power Spectral Density, Coherence, and Coherent Output Power.

 Supports the Exponential response window type.

 Supports the following reference window types: Hanning, Hamming, Bartlett,

Blackman, Blackman Harris, FlatTop, Exponential, Force, and Cosine Taper windows.

 Supports real, imaginary, and Nyquist display functions.

 Allows you to save data in the .uff file format.

• DtxMeasurement IVI-COM driver – This driver provides access to the instrument’s functions through a COM server. The IVI-COM driver works in any 32-bit or 64-bit development environment that supports COM programming, including MATLAB, Visual Basic.NET, Visual C#.NET, Agilent VEE Pro, LabVIEW, LabWindows, and others.

• Measurement Calibration Utility – Users can calibrate a TEMPpoint, VOLTpoint, or MEASURpoint instrument in the field using precise calibration equipment and the Measurement Calibration Utility. Since each instrument consists of up to 48 individual channels, great care must be taken to ensure that proper warm-up times are followed and precise calibration equipment is used.

The calibration utility ships with a comprehensive help file that describes the required equipment and calibration procedure, including warm-up times, for each instrument.

The calibration utility allows you to revert to the factory calibration for any or all channels, or revert back to the last user calibration values, if desired. In addition, this utility generates a report that lists the starting and ending calibration values for each channel, allowing traceability.

Page 21

Accessories

The following optional accessories are available for TEMPpoint, VOLTpoint, or MEASURpoint instruments:

• STP37 screw terminal panel – The STP37, shown in Figure 4, permits easy screw terminal connections for accessing the digital I/O signals of a TEMPpoint, VOLTpoint, or MEASURpoint instrument.

Overview

Figure 4: STP37 Screw Terminal Panel

• EP333 cable–The EP333, shown in Figure 5, is a 2-meter shielded cable with two 37-pin connectors that connects the STP37 screw terminal panel to the digital I/O connector of the instrument.

Figure 5: EP333 Cable

• EP373 Single Rack-mount Kit – Mounts one TEMPpoint, VOLTpoint, or MEASURpoint instrument in a rack.

• EP374 Dual Rack-mount Kit – Mounts two TEMPpoint, VOLTpoint, or MEASURpoint instruments side-by-side in a rack.

Page 22

Chapter 1

Set Up and Install the Instrument

(see Chapter 3 starting on page 31)

Wire Signals

(see Chapter 4 starting on page 41)

Verify the Operation of the Instrument

(see Chapter 5 starting on page 63)

Prepare to Use the Instrument

(see Chapter 2 starting on page 25)

Getting Started Procedure

The flow diagram shown in Figure 6 illustrates the steps needed to get started using a TEMPpoint, VOLTpoint, or MEASURpoint instrument. This diagram is repeated in each Getting Started chapter; the shaded area in the diagram shows you where you are in the getting started procedure.

Figure 6: Getting Started Flow Diagram

Page 23

Part 1: Getting Started

Page 24

Page 25

Preparing to Use the

Instrument

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

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

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

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

Page 26

Chapter 2

Set Up and Install the Instrument

(see Chapter 3 starting on page 31)

Wire Signals

(see Chapter 4 starting on page 41)

Verify the Operation of the Instrument

(see Chapter 5 starting on page 63)

Prepare to Use the Instrument

(this chapter)

Page 27

Unpacking

Open the shipping box and verify that the following items are present:

• TEMPpoint, VOLTpoint, or MEASURpoint instrument

•USB cable

• EP361 +5V power supply and cable

• For DT9872, DT9874, and DT9874 instruments, a bag of pluggable screw terminable blocks

If an item is missing or damaged, contact Data Translation. If you are in the United States, call the Customer Service Department at (508) 946-5100. An application engineer will guide you through the appropriate steps for replacing missing or damaged items. If you are located outside the United States, call your local distributor, listed on Data Translation’s web site (www.mccdaq.com).

Once you have unpacked your instrument, check the system requirements, as described in the next section.

Preparing to Use the Instrument

Page 28

Chapter 2

Checking the System Requirements

For reliable operation, ensure that your computer meets the following system requirements:

• Processor: Pentium 4/M or equivalent

•RAM: 1 GB

• Screen Resolution: 1024 x 768 pixels

• Operating System: Windows 8, Windows 7, Windows Vista (32- and 64-bit)

Windows XP SP3 (32-bit)

• Disk Space: 4 GB

• Acrobat Reader 5.0 or later for viewing documentation

Page 29

Installing the Software

Install the software for your instrument from the web at https://www.mccdaq.com/downloads/DTSoftware/MEASURpoint.

The installation program guides you through the installation process.

Preparing to Use the Instrument

Page 30

Chapter 2

Viewing the Documentation

Note: To view the documentation, you must have Adobe Reader 5.0 or greater installed on your system.

You can access the documentation for your instrument from the Windows Start menu as follows:

• For documentation about the TEMPpoint, VOLTpoint, or MEASURpoint instrument, click

Programs -> Data Translation, Inc -> Hardware Documentation -> User’s Manual for Standard TEMPoint, VOLTpoint, and MEASURpoint USB Instruments.

• For documentation on QuickDAQ, click Programs -> Data Translation, Inc -> QuickDAQ -> QuickDAQ User’s Manual

• For documentation on the DtxMeasurement IVI-COM driver, click Programs -> Data Translation, Inc -> DtxMeasurement -> DtxMeasurement IVI Driver 1.1.8 Documentation.

The following may be helpful when using Adobe Reader:

• To navigate to a specific section of the document, click a heading from the table of contents on the left side of the document.

• Within the document, click the text shown in blue to jump to the appropriate reference (the pointer changes from a hand to an index finger).

• To go back to the page from which the jump was made, click the right mouse button and Go Back, or from the main menu, click Document, and then Go Back.

• To increase or decrease the size of the displayed document, from the main menu, click View, and then Zoom.

• By default, Adobe Reader smooths text and monochrome images, sometimes resulting in blurry images. If you wish, you can turn smoothing off by clicking File, and then Preferences/General, and unchecking Smooth Text and Images.

Page 31

Setting Up and Installing

the Instrument

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

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

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

Page 32

Chapter 3

Set Up and Install the Instrument

(this chapter)

Wire Signals

(see Chapter 4 starting on page 41)

Prepare to Use the Instrument

(see Chapter 2 starting on page 25)

Verify the Operation of the Instrument

(see Chapter 5 starting on page 63)

Note: Your TEMPpoint, VOLTpoint, and MEASURpoint instruments are factory-calibrated. Thereafter, yearly recalibration is recommended. Refer to page 94 for more information on calibration.

Page 33

Applying Power

EP361 +5 V

Power Supply

Power

Switch

TEMPpoint, VOLTpoint, and MEASURpoint instruments are shipped with an EP361 +5V power supply and cable. To apply power to the instrument, do the following:

1. Connect the +5 V power supply to the power connector on the rear panel of the

instrument. Refer to Figure 7.

Setting Up and Installing the Instrument

Figure 7: Attaching a +5 V Power Supply to the Instrument

2. Plug the power supply into a wall outlet.

IMPORTANT: For proper grounding of your measurement instrument, ensure that you

use the power supply and cable (EP361) that is provided with the instrument and that you use all three prongs of the cable when connecting it to your wall outlet.

3. Press the Power Switch to turn on the instrument.

The Power LED on the front panel lights to indicate that power is on.

Page 34

Chapter 3

Powe r L ED

Figure 8 shows the location of the Power LED on the front panel of the instrument; a

MEASURpoint instrument is shown in this example.

Figure 8: Power LED on the Front Panel of the Instrument

Page 35

Setting Up and Installing the Instrument

Attaching the Instrument to the Computer

This section describes how to attach a TEMPpoint, VOLTpoint, or MEASURpoint instrument to the host computer.

Notes: Most computers have several USB ports that allow direct connection to USB devices. If your application requires more TEMPpoint, VOLTpoint, or MEASURpoint instruments than you have USB ports for, you can expand the number of USB devices attached to a single USB port by using expansion hubs. For more information, refer to page 38.

You can unplug a USB instrument, then plug it in again, if you wish, without causing damage. This process is called hot-swapping. Your application may take a few seconds to recognize an instrument once it is plugged back in.

You must install the device driver before connecting your instrument to the host computer. See page 29 for more information.

Connecting Directly to the USB Ports

To connect a TEMPpoint, VOLTpoint, or MEASURpoint instrument directly to a USB port on your computer, do the following:

1. Make sure that you have attached a power supply to the instrument.

2. Attach one end of the USB cable to the USB port on the rear panel of the instrument, as

shown in Figure 9.

Page 36

Chapter 3

Attach USB cable

to USB port of host

computer

USB port of

instrument

Figure 9: Attaching the Instrument to the Host Computer

3. Attach the other end of the USB cable to one of the USB ports on the host computer.

The operating system automatically detects the instrument and starts the Found New Hardware wizard.

4. For Windows Vista

a. Click Locate and install driver software (recommended).

The popup message "Windows needs your permission to continue" appears.

b. Click Continue.

The Windows Security dialog box appears.

c. Click Install this driver software anyway.

For Windows XP:

a. Click Next and/or Finish as required in the wizard.

Once the firmware is loaded, the wizard restarts to initiate the firmware to accept commands.

b. Click Next and/or Finish again.

Page 37

Setting Up and Installing the Instrument

USB LED LMT LED OPN LED

Note: Windows 7 and Windows 8 find the device automatically.

If the power supply and the instrument are attached correctly, the USB LED on the rear panel, shown in Figure 10, turns green.

Figure 10: LEDs on the Rear Panel of the Instrument

5. Repeat the steps to attach another TEMPpoint, VOLTpoint, or MEASURpoint instrument

to the host computer, if desired.

Page 38

Chapter 3

Connecting to an Expansion Hub

Expansion hubs are powered by their own external power supply. Theoretically, you can connect up to five expansion hubs to a USB port on the host computer. However, the practical number of instruments that you can connect to a single USB port depends on the throughput you want to achieve. Each of the hubs supports up to four instruments.

To connect multiple TEMPpoint, VOLTpoint, or MEASURpoint instruments to an expansion hub, do the following:

1. Make sure that you have attached a power supply to the instrument.

2. Attach one end of the USB cable to the instrument and the other end of the USB cable to

an expansion hub.

3. Connect the power supply for the expansion hub to an external power supply.

4. Connect the expansion hub to the USB port on the host computer using another USB

cable.

The operating system automatically detects the instrument and starts the Found New Hardware wizard.

5. For Windows Vista

a. Click Locate and install driver software (recommended).

The popup message "Windows needs your permission to continue" appears.

b. Click Continue.

The Windows Security dialog box appears.

c. Click Install this driver software anyway.

For Windows XP:

a. Click Next and/or Finish as required in the wizard.

Once the firmware is loaded, the wizard restarts to initiate the firmware to accept commands.

b. Click Next and/or Finish again.

Note: Windows 7 and Windows 8 find the device automatically.

If the power supply and the instrument are attached correctly, the USB LED on the rear panel, shown in Figure 10, turns green.

6. Repeat these steps until you have attached the number of expansion hubs (up to five) and

instruments (up to four per hub) that you require. Refer to Figure 11.

The operating system automatically detects the instruments as they are installed.

Page 39

Setting Up and Installing the Instrument

+5 V Power Supply

USB Cable

Expansion Hubs

Host Computer

Power Supply

for Hub

USB Cables

USB Cable

Power Supply

for Hub

+5 V Power Supply

USB

Cables

TEMPpoint,

VOLTpoint, or

MEASURpoint

TEMPpoint,

VOLTpoint, or

MEASURpoint

TEMPpoint,

VOLTpoint, or

MEASURpoint

TEMPpoint,

VOLTpoint, or

MEASURpoint

Figure 11: Attaching Multiple Instruments Using Expansion Hubs

Page 40

Chapter 3

Configuring the Device Driver

Note: In Windows 7, Windows 8, and Vista, you must have administrator privileges to run the Open Layers Control Panel. When you double-click the Open Layers Control Panel icon, you may see the Program Compatibility Assistant. If you do, select Open the control panel using recommended settings. You may also see a Windows message asking you if you want to run the Open Layers Control Panel as a "legacy CPL elevated." If you get this message, click Yes.

If you do not get this message and have trouble making changes in the Open Layers Control Panel, right click the DTOLCPL.CPL file and select Run as administrator. By default, this file is installed in the following location:

Windows 7, Windows 8, and Vista (32-bit) C:\Windows\System32\Dtolcpl.cpl

Windows 7, Windows 8, and Vista (64-bit) C:\Windows\SysWOW64\Dtolcpl.cpl

To configure the device driver for a TEMPpoint, VOLTpoint, or MEASURpoint instrument, do the following:

1. If you have not already done so, power up the host computer and all peripherals.

2. From the Windows Start menu, select Settings -> Control Panel.

3. From the Control Panel, double-click Open Layers Control Panel.

The Data Acquisition Control Panel dialog box appears.

4. Click the name of the instrument that you want to configure, and then click Advanced.

The Configurable Board Options dialog box appears.

5. For each channel, set the Channel Configuration as voltage (the default) or one of the

supported sensor types for that channel.

Note: If you wish, you can overwrite these channel input types programmatically using your software development environment or application.

6. Click OK.

7. If you want to rename the instrument, click Edit Name, enter a new name for the

instrument, and then click OK. The name is used to identify the instrument in all subsequent applications.

8. Repeat steps 4 to 7 for the other instrument that you want to configure.

9. When you are finished configuring the instrument, click Close.

Continue with the instructions on wiring in Chapter 4 starting on page 41.

Page 41

Wiring Signals

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

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

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

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

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

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

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

Page 42

Chapter 4

Set Up and Install the Instrument

(see Chapter 3 starting on page 31)

Wire Signals

(this chapter)

Verify the Operation of the Instrument

(see Chapter 5 starting on page 63)

Prepare to Use the Instrument

(see Chapter 2 starting on page 25)

Page 43

General Wiring Recommendations

Keep the following recommendations in mind when wiring signals to a TEMPpoint, VOLTpoint, or MEASURpoint instrument:

• Separate power and signal lines by using physically different wiring paths or conduits.

• To avoid noise, do not locate the instrument and cabling next to sources that produce high electromagnetic fields, such as large electric motors, power lines, solenoids, and electric arcs, unless the signals are enclosed in a mumetal shield.

• Locate the instrument’s front panel as far away as possible from sources of high or low temperatures or strong air currents, such as fans.

• Prevent electrostatic discharge to the I/O while the instrument is operational.

• When wiring thermocouples, select an appropriate wire length and gauge for each thermocouple; in general, use the shortest wire length and largest gauge for the application to yield best results.

• Use shielded wire for maximum rejection of electrical interference.

Wiring Signals

Page 44

Chapter 4

Warm-Up Time

For accurate thermocouple measurements, MEASURpoint instruments require a warm-up time of 1 hour for the analog circuitry to stabilize.

For accurate RTD measurements, ensure that your RTD sensors and external calibration resistors warm up for 1 minute after the MEASURpoint instrument has been warmed up for 1 hour.

Page 45

Connecting Thermocouple Inputs

The DT9871U, DT9871, and DT9874 instruments contain thermocouple jacks for connecting thermocouple inputs.

Note: On the standard DT9874 instrument, channels 0 to 15 correspond to the thermocouple input channels.

Internally, these signals are connected in differential mode. You can mix and match the following thermocouple types across channels: B, E, J, K, N, R, S, and/or T.

Each thermocouple input jack is polarized and accepts a mating plug in the appropriate orientation. Tabl e 1 lists the color designations for the + and – polarities of the supported thermocouple types for both the ANSI (American) and IEC (International) standards.

Table 1: Thermocouple Color Designation Standards

Wiring Signals

Thermocouple

Standard

ANSI Type J White Red

IEC Type J Black White

Thermocouple

Type

Type K Yellow Red

Type T Blue Red

Type E Violet Red

Type S Black Red

Type R Black Red

Type B Gray Red

Type N Orange Red

Type K Green White

Type T Brown White

Type E Violet White

Type S Orange White

Type R Orange White

Wire Color Coding

+ Polarity

Wire Color Coding

– Polarity

Type B Gray White

Type N Pink White

For more information on thermocouple standards, refer to the following web site: http://www.omega.com/thermocouples.html.

Page 46

Chapter 4

Thermocouple

Channels

Thermocouple Input

–

Omega Plug (SMPW)

CAUTION:

When connecting inputs to the thermocouple connectors on a MEASURpoint or TEMPpoint instrument, it is highly recommended that you use only original Omega thermocouple plugs (SMPW), as connectors from other suppliers may not be equivalent mechanically. Refer to page 126 for more information on the connectors.

If you use connectors from suppliers other than Omega, there is a risk that you may mechanically damage the thermocouple connectors on the MEASURpoint or TEMPpoint instrument.

Figure 12 shows how to connect a thermocouple input to a thermocouple channel.

Figure 12: Connecting Thermocouple Inputs

Page 47

Connecting RTD Inputs

RTD

Channels

Current

– Sense2+Sense

Return

Each DT9872 and DT9874 contains pluggable screw terminals for connecting RTD inputs. Internally, these signals are connected in differential mode.

Note: On the standard DT9874 instrument, channels 16 to 31 correspond to the RTD input channels.

Figure 13 shows the numbering of the screw terminal blocks for RTD connections.

Wiring Signals

Figure 13: Screw Terminal Block Numbering for RTD Connections

The DT9872 supplies each RTD channel with 425 A of excitation current to prevent self-heating. The resistance of the RTD circuit increases gradually, repeatably, and linearly with temperature. As the resistance increases, the voltage drop across the RTD also increases.

Page 48

Chapter 4

RTD Channel

RTD

425 A

Current

– Sense +Sense

Return

1243

The DT9872 reads this voltage drop and automatically converts the voltage to the appropriate temperature based on the RTD type.

The DT9872 and DT9874 support Pt100 (100  Platinum), Pt500 (500  Platinum), and Pt1000 (1000  Platinum) RTD types using Alpha coefficients of 0.00385 and 0.00392; you can mix and match RTD types across RTD channels. Refer to the following web site for more information on RTD types: http://www.omega.com.

To connect an RTD input, you can use a 4-wire, 3-wire, or 2-wire connection scheme, described in the following subsections. For the best accuracy, use 4-wire RTD connections; this connection scheme enables Kelvin sensing to minimize errors due to lead wire resistance.

4-Wire RTD Connections

The 4-wire configuration offers the best accuracy with long connection wires, compared to the 3- and 2-wire configurations. The 4-wire connection scheme eliminates errors due to lead wire resistance (R is automatically cancelled as long as the sense wires are connected.

Figure 14 shows a 4-wire RTD connection.

) and thermal heating. Wire impedance of up to 100  anywhere in the hookup

Figure 14: 4-Wire RTD Connection

3-Wire RTD Connections

The 3-wire configuration eliminates one wire from the 4-wire RTD connection. Lead wire resistance (R drop is essentially equal and opposite to the voltage drop across +Sense.

Figure 15 shows a 3-wire RTD connection.

) errors in the return wire from –Sense may be introduced unless the voltage

Page 49

Wiring Signals

RTD Channel

RTD

425 A

Current

– Sense +Sense

Return

1243

*RL is lead wire resistance.

Figure 15: 3-Wire RTD Connection

2-Wire RTD Connections

The 2-wire configuration is the least accurate of the RTD wiring configurations because the lead wire resistance (R measurement errors, particularly if the lead wire is long. If you decide to use the 2-wire connection scheme, ensure that you use short lead wire connections.

For example, if the lead resistance is 0.5  in each wire, the lead resistance adds a 1  of error to the resistance measurement. Using a 100  RTD (Pt100) with a 0.00385/°C European curve coefficient, the resistance represents an initial error of 1  /(0.385 /°C) or 2.6°C. Since the lead wire resistance changes with ambient temperature, additional errors are also introduced in the measurement.

Figure 16 shows a 2-wire RTD connection.

) and its variation with temperature contribute significant

Page 50

Chapter 4

RTD Channel

RTD

425 A

Current

– Sense +Sense

Return

1243

Figure 16: 2-Wire RTD Connection

Page 51

Connecting Voltage Inputs

The way you connect voltage inputs depends on the channel type you are using. This section describes how to connect voltage inputs to thermocouple input channels, RTD input channels, and voltage input channels.

Connecting Voltage Inputs to Thermocouple Channels

Figure 17 shows how to connect a differential voltage input to a thermocouple input channel

on the DT9871U, DT9871, or DT9874 instrument.

Note: On the standard DT9874 instrument, channels 0 to 15 correspond to the thermocouple input channels.

Wiring Signals

Page 52

Chapter 4

Voltage Input

–

Omega Plug (SMPW-U-M)

Analog Input 0Analog Input 0

Return

Signal Source

+–

Thermocouple

Channels

Figure 17: Connecting Voltage Inputs to a Thermocouple Channel

Page 53

Connecting Voltage Inputs to RTD Channels

Vin +Vin –

RTD Channel

– Sense +Sense

1243

Shield

Figure 18 shows how to connect a voltage input to an RTD channel on a DT9872 or DT9874

instrument.

Note: On the standard DT9874 instrument, channels 16 to 31 correspond to the RTD input channels.

Wiring Signals

Figure 18: Connecting Voltage Inputs to an RTD Channel

The input impedance is well over 100 M using the voltage –Sense and +Sense inputs.

For best accuracy when connecting voltage inputs, use twisted-pair wires with a dead-ended shield connected to pin 4 of the screw terminal block.

Page 54

Chapter 4

Voltage Input

Channels

+Sense

–Sense2No

Connect

Shield

Connecting Voltage Inputs to Voltage Channels

Each DT9873 and DT9874 contains pluggable screw terminals for connecting voltage inputs.

Note: On the standard DT9874 instrument, channels 32 to 47 correspond to the voltage input channels.

Figure 19 shows the numbering of the screw terminal blocks for voltage input connections.

Figure 19: Screw Terminal Block Numbering for Voltage Connections

Page 55

Figure 20 shows how to connect voltage inputs to the DT9873 and DT9874.

Vin +Vin –

Voltage Input Channel

– Sense +Sense

1243

Shield

*Pin 2 is no connect

Wiring Signals

The input impedance is well over 100 M using the voltage –Sense and +Sense inputs.

Note: For best accuracy when connecting voltage inputs, use twisted-pair wires with a dead-ended shield connected to pin 4 of the screw terminal block.

Figure 20: Connecting Voltage Inputs

Page 56

Chapter 4

Connecting Current Loop Inputs

In some applications, such as solar cell, fuel cell, and car battery testing applications, you may want to accurately sense and measure current in a high voltage loop.

TEMPpoint, VOLTpoint, and MEASURpoint instruments provide channel-to-channel functional isolation of 60 VDC maximum continuous working voltage, meaning that each input can be referenced to 60 VDC maximum, with a 500 Vpk withstand rating, verified by a 5 s dielectric withstand test.

The way you connect current loop inputs depends on the channel type you are using. This section describes how to connect current loop inputs to thermocouple input channels, RTD input channels, and voltage input channels.

Connecting Current Loop Inputs to Thermocouple Channels

Thermocouple input channels on the DT9871U and DT9874 have an input range of ±0.075 V. Therefore, you can use a 1  series resistor to measure ±0.075 A. Similarly, you can use a 0.1  series resistor to measure ±0.75 A.

Thermocouple input channels on the DT9871 have an input range of ±1.25 V. Therefore, you can use a 1  series resistor to measure ±1.25 A. Similarly, you can use a 0.1  series resistor to measure ±12.5 A or a 10  series resistor to measure ±0.125 A.

Figure 21 shows how to wire your signals to measure a current loop. In this example, the input

is referenced to ±60 V.

Note: On the standard DT9874 instrument, channels 0 to 15 correspond to the thermocouple input channels.

Page 57

Wiring Signals

1 series resistor

60 V

Circuit+

–

Use a 1

 series resistor to convert current to voltage.

For thermocouple channels on the DT9871U and DT9874, 1

= 0.075 A = 0.075 V.

For thermocouple channels on the DT9871, 1

= 1.25 A = 1.25 V.

Thermocouple

Channels

Figure 21: Connecting Current Loop Inputs to Thermocouple Channels

Page 58

Chapter 4

1 shunt resistor

Use a 1

 shunt resistor to convert current to voltage: 1 = 1.25 A = 1.25 V.

60 V

Circuit+

–

RTD Channel

– Sense +Sense

1243

Shield

Connecting Current Loop Inputs to RTD Channels

RTD channels on the DT9872 and DT9874 instruments have an input range of ±1.25 V. Therefore, you can use a 1  shunt resistor to measure ±1.25 A. Similarly, you can use a 0.1  shunt resistor to measure ±12.5 A or a 10  shunt resistor to measure ±0.125 A.

Figure 22 shows how to wire your signals to measure a current loop. In this example, the input

is referenced to ±60 V.

Note: On the standard DT9874 instrument, channels 16 to 31 correspond to the RTD input channels.

Figure 22: Connecting Current Loop Inputs to RTD Channels

Page 59

Connecting Current Loop Inputs to Voltage Channels

250 

shunt resistor

28 V (can be up to ±60 V)

±20 mA

Load

–

Voltage Channel

– Sense +Sense

1243

Shield

In this example, the input range is ±10 V.

Voltage channels on the DT9873 and DT9874 instruments have an input range of ±10 V or ±60 V. You select the input range for each channel using software.

With the 24-bit A/D converter, high current, high side current shunts can be used for resolutions of less than 0.01 A on a 100 A range.

Typi c al Sh unts :

• Vishay WSMS5515 .2 m - 2W - 100A - 20mV

• Vishay CSM2512S 10 m - 1W - 10A - 100mV

• Deltec MUB-500-50 .1 m - 25W - 500A - 50mV

Notes: On the DT9874 instrument, channels 32 to 47 correspond to the voltage input channels.

Wiring Signals

Figure 23 shows an example of wiring signals to measure ±20 mA using the ±10 V input

range.

Figure 23: Connecting a Current Loop Input to a Voltage Channel to Measure ±20 mA

Page 60

Chapter 4

EP333 Cable

STP37 Screw Terminal Panel

Digital I/O

Connector

Connecting Digital I/O Signals

To make digital I/O connections easier, you can use the optional STP37 screw terminal panel and EP333 cable with your TEMPpoint, VOLTpoint, or MEASURpoint instrument. Connect the STP37 to the digital I/O connector of the instrument as shown in Figure 24:

Figure 24: Connecting the Instrument to the STP37

Figure 25 shows the layout of the STP37 screw terminal panel and lists the assignments of

each screw terminal.

Page 61

Wiring Signals

120181937

TB2

TB4

TB3

TB5

TB1

Digital Input 1+

Digital Output 7

Digital Input 1



Digital Input 2+

Digital Input 2



Digital Input 3+

Digital Input 3



Digital Input 4+

Digital Input 4



Digital Input 5+

Digital Input 5



Digital Input 6+

Digital Input 6



Digital Input 7+

Digital Input 7



Not Connected

Digital Output 7

Digital Output 6

Digital Output 5

Digital Output 4

Digital Output 3

Digital Output 2

Digital Output 1

Digital Output 0

Digital Input 0+

Digital Input 0

Not Connected

DIN 0 +

DIN 1 +

TTL Outputs

Instrument

Digital I/O Connector

DIN 0 –

DIN 1 –

1 k*

+5 V*

*1 k pull-up to +5 V required for TTL outputs.

pin 21

pin 1

pin 20

pin 2

Figure 25: STP37 Screw Terminal Panel

Connecting Digital Input Signals

Figure 26 shows how to connect digital input signals (lines 0 and 1, in this case) to the digital

I/O connector on the TEMPpoint, VOLTpoint, or MEASURpoint instrument.

Figure 26: Connecting Digital Inputs

Page 62

Chapter 4

Digital Out 0

Digital Out 0pin 10

120 V AC

or 240 V AC

Relay

Motor

10 A

Fuse

NeutralHot

30V DC @ 400 mA

+ *

–

pin 29

Instrument

Digital I/O Connector

*Output can switch AC or DC.

Controlled by

Software

Note: Relay, motor, and circuits must be properly rated. Reinforced isolation must be

maintained between the digital output circuits and the relay/motor

switching circuits.

Connecting Digital Output Signals

The digital output lines of a TEMPpoint, VOLTpoint, or MEASURpoint instrument act as solid-state relays. The customer-supplied signal can be ±30 V at up to 400 mA (peak) AC or DC.

You can use the digital output lines of the instrument to control solid-state or mechanical relays or high-current electric motors. Figure 27 shows how to connect digital output signals to line 0 of the instrument to control a motor relay.

Figure 27: Switching up to 30 V at 400 mA

Page 63

Verifying the Operation

of Your Instrument