Data Translation DT8871 User manual

User’s Manual for
UM-23652-AA
Standard TEMPpoint, VOLTpoint,
and MEASURpoint LXI
Title Page
Instruments
DT8871, DT8871U, DT8872, DT8873, DT8874

Copyright Page
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.
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

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Getting Started Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Part 1: Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 2: Preparing to Use the
Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Checking the System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Installing the Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Prerequisite Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Viewing the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Chapter 3: Setting Up and Installing
the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Connecting the Instrument to the LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Connecting to a Site LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Connecting to a Private LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Connecting Using a Hub or Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Connecting Directly to a Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Getting an IP Address and Host Name. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Determining Ethernet Activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Resetting the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Chapter 4: Wiring Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
General Wiring Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table of Contents

Contents
6
Warm-Up Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Connecting Thermocouple Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Connecting RTD Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4-Wire RTD Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3-Wire RTD Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
2-Wire RTD Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Connecting Voltage Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Connecting Voltage Inputs to Thermocouple Channels . . . . . . . . . . . . . . . . . . . . . . . . . 55
Connecting Voltage Inputs to RTD Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Connecting Voltage Inputs to Voltage Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Connecting Current Loop Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Connecting Current Loop Inputs to Thermocouple Channels. . . . . . . . . . . . . . . . . . . . 60
Connecting Current Loop Inputs to RTD Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Connecting Current Loop Inputs to Voltage Channels . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Connecting Digital I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Connecting Digital Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Connecting Digital Output Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Chapter 5: Configuring the Instrument
Using the Web Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Before Using the Web Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Java Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Internet Explorer Browser Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
JavaScript . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Security Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Internet Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Local Intranet Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Trusted Sites Zone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Pop-up Blockers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Associating CSV Files with Microsoft Excel or Notepad . . . . . . . . . . . . . . . . . . . . . . . . 74
Locating Your Instrument on the LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Running the Eureka Discovery Utility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Configuring Windows Firewall Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Launching the Web Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Configuring the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
LAN Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Channel Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Scan Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Filter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Alarm Limits Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Digital Input and Trigger Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Digital Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Contents
7
Measuring Data and Controlling the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Starting and Stopping a Scan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Controlling the Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Reading the Digital Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Downloading Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Part 2: Using Your
Instrument. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Chapter 6: Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
DT8871U Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
DT8871 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
DT8872 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
DT8873 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
DT8874 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Analog Input Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Analog Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Thermocouple Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Open Thermocouple Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
RTD Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Input Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Out of Range Data for Thermocouple Channels . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Out of Range Data for RTD Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Out of Range Data for Voltage Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Sample Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Trigger Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Conversion Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Simultaneous Single-Value Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Continuous Scan Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Specifying Analog Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
How Continuous Scan Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Data Format for Thermocouple Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Data Format for RTD Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Data Format for Voltage Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Digital I/O Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Contents
8
Digital Input Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Digital Output Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Channel-to-Channel Functional Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Operation Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Chapter 7: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
General Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
If Your Instrument Needs Factory Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Basic Instrument Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Thermocouple Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
System Temperature Error for the DT8871U and DT8874 . . . . . . . . . . . . . . . . . . . . . . 124
System Temperature Error for the DT8871 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
RTD Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Temperature Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Voltage Measurement Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Isolation and Protection Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Memory Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Digital I/O Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Power, Physical, and Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Regulatory Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Connector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Thermocouple Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
RTD Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Voltage Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Ethernet (RJ45) Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
External Power Supply Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Appendix B: Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Appendix C: Configuring Network Settings on
Your PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Configuring the PC to Use Auto-IP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Specifying a Static IP Address for your Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Reconfiguring the PC to Use a Static IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

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 DT8871,
DT8871U, and DT8872 Ethernet LXI (LAN eXtensions for Instrumentation) models.
VOLTpoint is a family of voltage measurement instruments that includes the DT9873 and
DT8873. This manual describes the DT8873 LXI model.
MEASURpoint™ a family of mixed temperature and voltage measurement instruments that
includes the DT9874 and DT8874. This manual describes the DT8874 LXI model.
Note: For information on the DT9871, DT9871U, DT9872, DT9873, and DT9874 USB models
of TEMPpoint, VOLTpoint, and MEASURpoint, refer to the User’s Manual for Standard
TEMPpoint, VOLTpoint, and MEASURpoint USB 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.
If you are using Standard Commands for Programmable Instruments (SCPI) to program your
instrument, refer to the SCPI Programmer’s Manual for MEASURpoint 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. It is
assumed that you have some familiarity with thermocouples, RTDs, and/or voltages and that
you understand your application.

About this Manual
10
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 the network.
•Chapter 4, “Wiring Signals,” describes how to wire signals to the instrument.
•Chapter 5, “Configuring the Instrument Using the Web Interface,” describes how to
configure the instrument using the instrument’s web interface.
•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.
•Appendix C, “Configuring Network Settings on Your PC,” describes how to configure the
network settings of your PC to use Auto-IP or a static IP address.
• 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.

About this Manual
11
Related Information
Refer to the following documents for more information on using a TEMPpoint, VOLTpoint, or
MEASURpoint LXI instrument:
• DtxMeasurement IVI-COM Driver online help. This document describes how to use the
IVI-COM driver to access the capabilities of your instrument.
The IVI-COM driver works with any development environment that supports COM
programming, including MATLAB® from The MathWorksTM, Microsoft® Visual C#®.NET
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.
•SCPI Programmer’s Manual for LXI Measurement Instruments. For programmers who want
to use the SCPI interface to program a TEMPpoint, VOLTpoint, or MEASURpoint
instrument, this document describes the supported SCPI commands and example
programs for these instruments.
• 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.
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).

About this Manual
12

13
1
Overview
Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Supported Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Getting Started Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter 1
14
Hardware Features
Data Translation provides a number of LXI (Ethernet) 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 Ethernet instruments are class C devices that comply with LXI version 1.1.
The following sections summarize the features of the TEMPpoint, VOLTpoint, and
MEASURpoint LXI instruments.
TEMPpoint Features
TEMPpoint instruments include the following models: DT8871U, DT8871, and DT8872.
Figure 1 shows a DT8871U instrument.
Figure 1: TEMPpoint Instrument
The key features of TEMPpoint instruments are as follows:
• DT8871U and DT8871:
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

Overview
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 DT8871U (with 0.25 V RMS A/D noise using no
software filtering) and ±1.25 V for the DT8871 (with 5 V RMS A/D noise using no
software filtering)
Break-detection circuitry to detect open thermocouple inputs
• DT8872:
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 DT8872 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
• 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 Instrument Calibration Utility allows you to calibrate the instrument in the
field (see page 21 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

Chapter 1
16
VOLTpoint Features
Figure 2 shows a VOLTpoint instrument.
Figure 2: VOLTpoint Instrument
The key features of VOLTpoint (DT8873) 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 Instrument Calibration Utility allows you to calibrate the instrument in the
field (see page 21 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

Overview
17
MEASURpoint Features
The standard MEASURpoint (DT8874) instrument provides 16 thermocouple channels, 16
RTD channels, and 16 voltage channels. Figure 3 shows a MEASURpoint instrument.
Figure 3: MEASURpoint Instrument
The key features of MEASURpoint (DT8874) 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

Chapter 1
18
• 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)
4-wire, 3-wire, or 2-wire configurations; the DT8872 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 per channel (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 Instrument Calibration Utility allows you to calibrate the instrument in the
field (see page 21 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

Overview
19
Supported Software
The following software is available for use with the TEMPpoint, VOLTpoint, and
MEASURpoint instruments:
•Eureka Discovery Utility – This utility helps you locate or "discover" all LXI (Ethernet)
instruments that are connected to your system and provides the following information
about your instrument: the IP address, manufacturer, model number, serial number, and
version of the firmware that is running on your instrument. In addition, you can use this
utility to configure Windows firewall settings and update the firmware for your Data
Translation LXI instrument.
•Instrument Web Interface – This built-in interface, described in Chapter 5, allows you to
verify the operation of your instrument and perform basic functions with Internet
Explorer and no additional software. Using it, you can configure your instrument, control
output signals, measure input signals, and save results to disk.
•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.
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.

Chapter 1
20
•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 basic FFT analysis features, including the following:
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.
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 advanced FFT analysis
features, including the following:
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.