User’s Manual for
Standard TEMPpoint, VOLTpoint,
and MEASURpoint LXI
Instruments
DT8871, DT8871U, DT8872, DT8873, DT8874
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Copyright Page
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.
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.
Specifying a Static IP Address for your Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Reconfiguring the PC to Use a Static IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
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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 USBInstruments.
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.
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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 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.
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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 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.
• 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)
About this Manual
TM
, Microsoft® Visual C#®.NET
• 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).
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.
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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
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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
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 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
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Chapter 1
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
16
• 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
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MEASURpoint Features
The standard MEASURpoint (DT8874) 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 (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
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Chapter 1
• 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
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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.
Overview
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.
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Chapter 1
• 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.
20
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.
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• 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- or 64-bit
development environment that supports COM programming, including MATLAB, Visual
Basic.NET, Visual C#.NET, Agilent VEE Pro, LabVIEW, LabWindows, and others.
• SCPI commands – Use SCPI commands to program TEMPpoint, VOLTpoint, or
MEASURpoint LXI instruments. Refer to the SCPI Programmer’s Manual for LXI Measurement Instruments for information on the supported SCPI commands and example
programs.
• Measurement Instrument Calibration Utility – Users can calibrate a TEMPpoint,
VOLTpoint, or MEASURpoint instrument in the field using precise calibration equipment
and the Measurement Instrument 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.
Overview
Refer to the Data Translation web site (www.mccdaq.com) for information about selecting the
right software package for your needs.
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Chapter 1
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.
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-mountKit – Mounts one TEMPpoint, VOLTpoint, or MEASURpoint
instrument in a rack.
• EP374 Dual Rack-mountKit – Mounts two TEMPpoint, VOLTpoint, or MEASURpoint
instruments side-by-side in a rack.
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Getting Started Procedure
Set Up and Install the Instrument
(see Chapter 3 starting on page 33)
Wire Signals
(see Chapter 4 starting on page 45)
Verify the Operation of the Instrument
(see Chapter 5 starting on page 67)
Prepare to Use the Instrument
(see Chapter 2 starting on page 27)
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.
Open the shipping box and verify that the following items are present:
• TEMPpoint, VOLTpoint, or MEASURpoint instrument
• EP372 Ethernet cable
• EP361 +5V power supply and cable
• For DT8872, DT8873, and DT8874 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).
Preparing to Use the Instrument
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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
• Disk Space: 4 GB
•Ethernet port
• Administrator privileges for software installation
• For access to the instrument web interface:
Java Version 6, Update 5 or greater
Internet Explorer 6.0 or 7.0 web browser
Refer to page 69 for more information on installing Java and configuring your browser
settings
• Acrobat Reader 5.0 or later for viewing documentation
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Installing the Software
This section describes how to install the software you need to use your TEMPpoint,
VOLTpoint, or MEASURpoint instrument.
Prerequisite Software
No prerequisite software is required if you are using a single client to access a TEMPpoint,
VOLTpoint, or MEASURpoint instrument on the LXI bus, or if you are managing how
multiple clients concurrently access the instrument on the LXI bus. (In these case, your
application can use sockets to communicate with the instrument.)
If, however, you want multiple clients to access your instrument on the LXI bus, and you want
to "lock" access to the instrument so that one client cannot change the configuration of the
instrument that another client is accessing, you need to install VISA; we recommend either
Agilent VISA or NI-VISA from National Instruments. You can then use the VISA methods
viLock/viUnlock to prevent other clients from accessing the instrument.
To install Agilent VISA, do the following:
Preparing to Use the Instrument
1. Go to www.agilent.com, enter IO Libraries Suite in the search field, and select Agilent
IO Libraries Suite 15.0 from the search results.
2. Follow the instructions on Agilent’s web site to download and install the Agilent IO
Libraries, which include VISA support, VISA COM support, and the Agilent Connection
Expert tool.
We recommend that you run Data Translation’s Eureka Discovery Utility that is provided with
the MEASURpoint software to locate your LXI instrument on the network (see page 75 for
more information).
Installation Instructions
Install the software for your instrument from the web at
http://mccdaq.com/downloads/DTSoftware/MEASURpoint.
The installation program guides you through the installation process.
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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 LXI Instruments.
• For documentation on the Eureka Discovery Utility, click Programs -> Data Translation,
Inc -> Instrument Support -> Eureka LXI Instrument Discovery.
• For documentation on the QuickDAQ application, 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.
• For documentation about SCPI support, click Programs -> Data Translation, Inc ->
Measurement SCPI Support ->SCPI Programmer’s Manual for Measurement.
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.
Note: Your TEMPpoint, VOLTpoint, and MEASURpoint instruments are factory-calibrated.
Thereafter, yearly recalibration is recommended. Refer to page 106 for more information on
calibration.
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Connecting the Instrument to the LAN
LAN
Connector
Figure 7 shows the LAN (RJ45) connector on the rear of the instrument that is used to connect
your instrument to the LAN (Local Area Network).
Setting Up and Installing the Instrument
Figure 7: LAN Connector on the Rear of the Instrument
This section describes how to connect your instrument to the LAN. Two connection schemes
are shown:
• Site LAN connections, described on page 36
• Private LAN connections, described on page 37
Note: It is recommended that you consult with your network administrator to ensure that
all network security, performance, and reliability issues are considered when using
connecting instruments to the LAN.
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Chapter 3
Computer
Ethernet
Hub/ Switch/ Router
TEMPpoint,
VOLTpoint, or
MEASURpoint
+5 V Power
Supply
+5 V Power
Supply
+5 V Power
Supply
+5 V Power
Supply
To S i t e LAN
TEMPpoint,
VOLTpoint, or
MEASURpoint
TEMPpoint,
VOLTpoint, or
MEASURpoint
TEMPpoint,
VOLTpoint, or
MEASURpoint
Connecting to a Site LAN
A site LAN is useful in applications that require access by many users or access by users at
distributed sites. In this connection scheme, a DHCP (Dynamic Host Configuration Protocol)
server is used to assign an IP address to the instrument.
Figure 8 shows a typical site LAN connections using a dedicated Ethernet hub, switch, or
router. Figure 9 shows typical site LAN connections without using a dedicated Ethernet hub,
switch, or router.
Note: Use standard LAN cables for network connections. TEMPpoint, VOLTpoint, and
MEASURpoint instruments ship with a standard LAN cable (EP372) for connecting to the
LAN (RJ45) connector on the rear panel of the instrument.
36
Figure 8: Typical Site LAN Connections using a Hub, Switch, or Router
Page 37
Setting Up and Installing the Instrument
Computer
+5 V Power
Supply
To S i t e LAN
To Site L A N
TEMPpoint,
VOLTpoint, or
MEASURpoint
Figure 9: Typical Site LAN Connections Without Using a Hub, Switch, or Router
Connecting to a Private LAN
A private LAN (or subnet) generally involves the direct connection of the instruments to the
computer, and may include Ethernet hubs or switches. Access to the instruments is limited to
users that are directly connected to the private LAN; therefore, security, performance, and
reliably are generally better on a private LAN than on a site LAN.
In this connection scheme, the DHCP (Dynamic Host Configuration Protocol) server is
typically not available; therefore, Auto-IP is used to assign an IP address to the instrument.
Note: If no DHCP server exists and your PC is set up to use a static IP address, you must
temporarily reconfigure your PC to use Auto-IP, as described on Appendix C starting on
page 145.
Connecting Using a Hub or Switch
Figure 10 shows a typical connection scheme when connecting TEMPpoint, VOLTpoint, or
MEASURpoint instruments to a private LAN using a dedicated Ethernet hub or switch.
Note: Use standard LAN cables for network connections. The instrument ships with a
standard LAN cable (EP372) for connecting to the LAN (RJ45) connector on the rear panel of
the instrument.
37
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Chapter 3
Computer
Ethernet
Hub/ Switch
+5 V Power
Supply
+5 V Power
Supply
+5 V Power
Supply
+5 V Power
Supply
TEMPpoint,
VOLTpoint, or
MEASURpoint
TEMPpoint,
VOLTpoint, or
MEASURpoint
TEMPpoint,
VOLTpoint, or
MEASURpoint
TEMPpoint,
VOLTpoint, or
MEASURpoint
Computer
+5 V Power
Supply
Standard LAN Cable (if PC enabled Auto-MDIX)
or
Ethernet Crossover Cable (if PC doesn’t enable
Auto-MDIX or you are not sure)
TEMPpoint,
VOLTpoint, or
MEASURpoint
Figure 10: Typical Private LAN Connections using a Hub or Switch
Connecting Directly to a Computer
Optionally, you can connect the TEMPpoint, VOLTpoint, or MEASURpoint instrument
directly to your computer, creating an ad hoc network, as shown in Figure 11. Be aware that
the time and date settings of the instrument will not be updated using this connection method.
Therefore, this connection scheme is generally recommended for quick set up and verification
only.
Note: TEMPpoint, VOLTpoint, and MEASURpoint instruments do not support the
Auto-MDIX function; therefore, use a crossover cable rather than a standard LAN cable to
connect your instrument unless your computer has enabled the Auto-MDIX function.
Figure 11: Typical Private LAN Connections when Connecting Directly to a Computer
38
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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 12.
Setting Up and Installing the Instrument
Figure 12: Attaching a +5 V Power Supply to the Instrument
2. Plug the power supply into a wall outlet.
Note: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 on the rear panel of the instrument, shown in Figure 12, to turn on
the instrument.
The Power LED on the front panel lights to indicate that power is on.
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Chapter 3
Power L EDLAN LED
Figure 13 shows the location of the LEDs on the front panel of the instrument; a
MEASURpoint instrument is shown in this example.
Figure 13: LEDs on the Front Panel of the Instrument
40
Page 41
Getting an IP Address and Host Name
Once your instrument is connected to the LAN and powered on, the instrument automatically
requests an Ethernet address from a DHCP (Dynamic Host Configuration Protocol) server, if
available, and a host name from a DNS (Dynamic Domain Name Service) server, if available.
If these services are not available on the LAN, the instrument uses Auto-IP to set up its
TCP/IP configuration. In this case, the IP address is in the range of 169.254.0.0 to
169.254.255.255 with a subnet mask of 255.255.0.0.
Note: If no DHCP server exists and your PC is set up to use a static IP address, you must
temporarily reconfigure your PC to use Auto-IP, then configure your instrument to use a
static IP address, as described in Appendix C starting on page 145.
You can use the instrument’s web interface, described in Chapter 5 starting on page 67, to see
the IP address and host name that is assigned to your instrument.
Setting Up and Installing the Instrument
Notes: When programming a TEMPpoint, VOLTpoint, or MEASURpoint instrument, you
access the instrument through its address string, which consists of an IP address or host
name, such as TCPIP0::192.43.218.69::inst0::INSTR or TCPIP0::192.43.218.69::SOCKET. If a
host name was returned by the DNS server, you can also address the instrument using its
host name, such as TCPIP0::arrakis.datx.com::inst0::INSTR.
For IVI-COM programmers, you can also assign a VISA alias to the instrument. For example,
rather than addressing the instrument as TCPIP0::192.43.218.69::inst0::INSTR, you can a
VISA alias, such as TEMPpoint1, instead. See your VISA documentation for more
information on VISA resource strings and creating VISA aliases.
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Chapter 3
USB LED (not used on this instrument)
LMT LED
OPN LED
ENet Link
LED
ENet Activity
LED
Reset Pin
Determining Ethernet Activity
You can use the ENet Link and ENet Activity LEDs on the rear of the instrument, shown in
Figure 14, with the LAN LED on the front of the instrument, shown in Figure 13, to determine
the Ethernet activity on your instrument. Tab le 1 describes the meaning of these LEDs.
Figure 14: Rear Panel of the Instrument
Table 1: Using LEDs to Determine Ethernet Activity
LEDsColorDescription
LAN LED
(on front panel)
Solid GreenInstrument has valid IP address.
Blinking GreenInstrument identified using the Web interface; see page 75
RedIf the Ethernet link is operational, the instrument does not
for more information.
have a valid IP address.
Otherwise, the Ethernet link is not operational.
42
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Table 1: Using LEDs to Determine Ethernet Activity (cont.)
LEDsColorDescription
Setting Up and Installing the Instrument
ENet Link LED
(on rear panel)
ENet Activity LED
(on rear panel)
YellowEthernet link operational.
OffEthernet link not operational.
GreenNetwork traffic detected.
OffNo network traffic detected.
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Chapter 3
Resetting the Instrument
If needed, you can restore the default configuration of your instrument by pressing the Reset
pin on the rear panel of the instrument, shown in Figure 14 on page 42, until the LAN LED on
the front panel turns off (which takes approximately 5 seconds), and then releasing the Reset
pin.
The instrument reboots automatically using the factory-default LAN configuration (DHCP
and auto-IP enabled); this process typically takes up to 40 seconds to complete. This forces the
instrument to re-acquire an IP address from the DHCP server, or if that fails, to use Auto-IP to
get an IP address.
Note: The default configuration overwrites any changes that you have made to the LAN
configuration (IP address and password) using the instrument’s web interface. Refer to page
79 for information on the default values that are used when the instrument is reset.
The calibration parameters are not affected by the reset.
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
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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.
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Connecting Thermocouple Inputs
The DT8871U, DT8871, and DT8874 instruments contain thermocouple jacks for connecting
thermocouple inputs.
Note: On the standard DT8874 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 2 lists the color designations for the + and – polarities of the supported
thermocouple types for both the ANSI (American) and IEC (International) standards.
Table 2: Thermocouple Color Designation Standards
Wiring Signals
Thermocouple
Standard
ANSIType JWhiteRed
IECType JBlackWhite
Thermocouple
Type
Type KYellowRed
Type TBlueRed
Type EVioletRed
Type SBlackRed
Type RBlackRed
Type BGrayRed
Type NOrangeRed
Type KGreenWhite
Type TBrownWhite
Type EVioletWhite
Type SOrangeWhite
Type ROrangeWhite
Wire Color Coding
+ Polarity
Wire Color Coding
– Polarity
Type BGrayWhite
Type NPinkWhite
For more information on thermocouple standards, refer to the following web site:
http://www.omega.com/thermocouples.html.
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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 138 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 15 shows how to connect a thermocouple input to a thermocouple channel.
50
Figure 15: Connecting Thermocouple Inputs
Page 51
Connecting RTD Inputs
RTD
Channels
1
Current
3
– Sense2+Sense
4
Return
Each DT8872 and DT8874 contains pluggable screw terminals for connecting RTD inputs.
Internally, these signals are connected in differential mode.
Note: On the standard DT8874 instrument, channels 16 to 31 correspond to the RTD input
channels.
Figure 16 shows the numbering of the screw terminal blocks for RTD connections.
Wiring Signals
Figure 16: Screw Terminal Block Numbering for RTD Connections
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Chapter 4
RTD Channel
RTD
425 A
Current
– Sense+Sense
Return
1243
R
L
R
L
R
L
R
L
The DT8872 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.
The DT8872 reads this voltage drop and automatically converts the voltage to the appropriate
temperature based on the RTD type.
The DT8872 and DT8874 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.
) and thermal heating. Wire impedance of up to 100 anywhere in the hookup
L
Figure 17 shows a 4-wire RTD connection.
Figure 17: 4-Wire RTD Connection
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3-Wire RTD Connections
RTD Channel
RTD
425 A
Current
– Sense+Sense
Return
R
L
1243
*RL is lead wire resistance.
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 18 shows a 3-wire RTD connection.
) errors in the return wire from –Sense may be introduced unless the voltage
L
Wiring Signals
Figure 18: 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.
) and its variation with temperature contribute significant
L
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Chapter 4
RTD Channel
RTD
425 A
Current
– Sense+Sense
Return
R
L
R
L
1243
Figure 19 shows a 2-wire RTD connection.
Figure 19: 2-Wire RTD Connection
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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 20 shows how to connect a differential voltage input to a thermocouple input channel
on the DT8871U, DT8871, or DT8874 instrument.
Note: On the standard DT8874 instrument, channels 0 to 15 correspond to the thermocouple
input channels.
Wiring Signals
55
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Chapter 4
Voltage Input
–
+
Omega Plug (SMPW-U-M)
Analog Input 0Analog Input 0
Return
Signal Source
+–
Thermocouple
Channels
56
Figure 20: Connecting Voltage Inputs to a Thermocouple Channel
Page 57
Connecting Voltage Inputs to RTD Channels
Vin +Vin –
RTD Channel
– Sense+Sense
1243
Shield
Figure 21 shows how to connect a voltage input to an RTD channel on a DT8872 or DT8874
instrument.
Note: On the standard DT8874 instrument, channels 16 to 31 correspond to the RTD input
channels.
Wiring Signals
Figure 21: 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.
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Chapter 4
Voltage Input
Channels
1
+Sense
3
–Sense2No
Connect
4
Shield
Connecting Voltage Inputs to Voltage Channels
Each DT8873 and DT8874 contains pluggable screw terminals for connecting voltage inputs.
Note: On the standard DT8874 instrument, channels 32 to 47 correspond to the voltage input
channels.
Figure 22 shows the numbering of the screw terminal blocks for voltage connections.
58
Figure 22: Screw Terminal Block Numbering for Voltage Connections
Page 59
Figure 23 shows how to connect voltage inputs to the DT8873 and DT8874.
Vin +Vin –
Voltage Channel
– Sense+Sense
1243
Shield
*Pin 2 is no connect
Figure 23: Connecting Voltage Inputs
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.
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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 DT8871U and DT8874 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 DT8871 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 24 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 DT8874 instrument, channels 0 to 15 correspond to the thermocouple
input channels.
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Wiring Signals
1 series resistor
60 V
Circuit+
+
–
+
–
Use a 1
series resistor to convert current to voltage.
For thermocouple channels on the DT8871U and DT8874, 1
= 0.075 A = 0.075 V.
For thermocouple channels on the DT8871, 1
= 1.25 A = 1.25 V.
Thermocouple
Channels
Figure 24: Connecting Current Loop Inputs to Thermocouple Channels
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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 DT8872 and DT8874 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 25 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 DT8874 instrument, channels 16 to 31 correspond to the RTD input
channels.
62
Figure 25: Connecting Current Loop Inputs to RTD Channels
Page 63
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 input channels on the DT8873 and DT8874 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 mV
• Vishay CSM2512S
10 mV
• Deltec MUB-500-50
.1 mV
Notes: On the DT8874 instrument, channels 32 to 47 correspond to the voltage input
channels.
Wiring Signals
Figure 26 shows an example of wiring signals to measure ±20 mA using the ±10 V input
range.
Figure 26: Connecting a Current Loop Input to a Voltage Channel to Measure ±20 mA
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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 27:
Figure 27: Connecting the Instrument to the STP37
Figure 28 shows the layout of the STP37 screw terminal panel and lists the assignments of
each screw terminal.
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Wiring Signals
J1
2
21
3
22
4
23
5
24
6
25
7
26
8
27
9
28
36
17
35
16
34
15
33
14
32
13
31
12
30
11
29
10
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
Not Connected
Digital Output 7
Digital Output 6
Digital Output 6
Digital Output 5
Digital Output 5
Digital Output 4
Digital Output 4
Digital Output 3
Digital Output 3
Digital Output 2
Digital Output 2
Digital Output 1
Digital Output 1
Digital Output 0
Digital Output 0
Digital Input 0+
Digital Input 0
Not Connected
Not Connected
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 28: STP37 Screw Terminal Panel
Connecting Digital Input Signals
Figure 29 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 29: Connecting Digital Inputs
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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 30 shows how to connect digital output signals
to line 0 of the instrument to control a motor relay.
You can configure the operation of your instrument either locally or remotely using the
instrument’s web interface.
If your browser supports Java, you can also verify the operation of your instrument using the
web interface.
The QuickDAQ application that is provided as part of the MEASURpoint software also allows
you to verify the operation of your instrument and does not require Java for operation;
therefore, if your browser does not support Java, use QuickDAQ instead. Refer to the
documentation provided with QuickDAQ for more information.
This chapter focuses on configuring your instrument using the web interface.
Note: DT8871, DT8871U, DT8872, and DT8873 instruments with firmware version 2.2.3.1 or
greater are identified in firmware as DT8874-xxT-xxR-xxV, where xxT specifies the number of
thermocouple channels, xxR specifies the number of RTD channels, and xxV specifies the
number of voltage input channels.
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Before Using the Web Interface
This section describes system requirements and browser settings for proper operation of the
instrument’s web interface.
Note: At any instant, up to 8 clients can access the instrument concurrently using the web
interface.
Up to 12 additional clients can access the instrument concurrently using SCPI commands
over VISA or sockets. Of these, 4 can be VXI-11 clients, which use the ::SOCKETS or
VISA::INSTR resource to access the instrument.
At this time, the web and SCPI interfaces cannot be "locked;" therefore, one client can change
the configuration of the instrument that another client is accessing. However, you can
optionally lock the VXI-11 interface using the VISA APIs viLock/viUnlock; this prevents
other VXI-11 clients (including VXI-11 discovery) from accessing the instrument. Refer to the
SCPI documentation for your instrument for more information on supported SCPI
commands.
Configuring the Instrument Using the Web Interface
Java Requirements
To verify the operation of your instrument through the web interface, your browser must
support Version 6, Update 5 or greater of Java. If your browser does not support Java, you can
still configure your instrument through the web interface; however, you must use QuickDAQ
to verify the operation of your instrument in this case.
You can verify Java versions and settings by accessing the Java Control Panel, select Windows
Start -> Control Panel and open the Java dialog. To download or upgrade Java, go to
www.java.com.
Internet Explorer Browser Settings
If you have an older version of Internet explorer that supports Java, configure your browser as
follows; otherwise, skip this section:
• JavaScript (Active Scripting) must be enabled
• Security level of the instrument’s IP address must be Medium-high or lower
• Pop-up blockers must be disabled
The following sections describe how to configure these settings.
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Chapter 5
JavaScript
To enable JavaScript (also referred to as Active Scripting), perform the following steps:
1. From the Internet Explorer browser, select To ol s -> Internet Options.
2. Click the Security tab.
3. Select Internet, and then click Custom Level.
4. Scroll down to the Scripting section.
5. Under Active Scripting, select Enable, and then click OK.
Security Levels
By default, the IP address of the instrument is added to the Internet zone. If you'd rather leave
the settings of the Internet zone at a level higher than Medium-high, then you can add the IP
address of the instrument to either the Local intranet or Trusted sites zone and configure the
security level of that zone to Medium-high or lower.
The following section describe how to configure each zone.
Internet Zone
To configure the security level of the instrument module’s IP address in the Internet zone,
perform the following steps:
1. From the Internet Explorer browser, select To ol s -> Internet Options.
2. Click the Security tab.
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Configuring the Instrument Using the Web Interface
3. Select Internet and move the slide bar to select a security level of Medium-high or lower.
4. Click OK.
Local Intranet Zone
To add the IP address of the instrument to the Local intranet zone and configure its security
level, do the following:
1. From the Internet Explorer browser, select To ol s -> Internet Options.
2. Click the Security tab.
3. Click Local intranet, and click Sites.
4. Select which web sites to add to the zone, and then click Advanced.
5. Enter the IP address of the instrument to the zone, and click Add.
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Chapter 5
6. Click Close.
7. Move the slide bar to select a security level of Medium-high or lower.
8. Click OK.
Trusted Sites Zone
To add the instrument’s IP address to the Trusted sites zone and configure its security level,
do the following:
To add the IP address of the instrument to the Trusted sites zone and configure its security
level, do the following:
1. From the Internet Explorer browser, select To ol s -> Internet Options.
2. Click the Security tab.
3. Click Tru st ed s it es , and click Sites.
4. Enter the IP address of the instrument to the zone (note that the address must be prefaced
by (https://), and click Add.
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Configuring the Instrument Using the Web Interface
5. Click Close.
6. Move the slide bar to select a security level of Medium-high or lower.
7. Click OK.
Pop-up Blockers
To disable pop-up blockers, perform the following steps:
1. From the Internet Explorer browser, select To ol s ->Pop-up Blocker.
2. Select Turn Off Pop-up Blocker.
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Chapter 5
Associating CSV Files with Microsoft Excel or Notepad
Note: This section applies only if your browser supports Java. If your browser does not
support Java, downloading data to a file through the web interface is not supported.
If files with the .CSV extension do not have the proper file associations/actions set up, then
clicking Download in the Download Measurements page of the instrument web interface will
not present the option of saving the data to a file or loading the data to an application, such as
Microsoft Excel
displayed in the browser.
The following steps describe how to associate a CSV file with Microsoft Excel or Notepad in
Windows XP; refer to the documentation for your operating system for more information:
1. From the Windows Control Panel, open the Folder Options dialog, and select File Types.
2. Scroll down to the CSV entry and select it. (If it is not in the list add it as a new file type by
selecting New and entering CSV).
®
or Microsoft
®
Notepad, that can display it. Instead, the data will be
3. Click Advanced to access the Edit File Type dialog box.
4. Click New to access the New Action dialog box.
5. Enter Open in the Action: edit field.
6. Click Browse and find Excel.exe (typically located in C:\Program Files\Microsoft
Office\OFFICExx\EXCEL.EXE) or Notepad.exe (typically located in
C:\Windows\Notepad.exe) on your system, and then click OK.
74
7. Click OK.
Now when you click Download on the Download Measurements web page, you should see a
dialog box asking if you want to Open or Save the data in the appropriate application.
Page 75
Configuring the Instrument Using the Web Interface
Locating Your Instrument on the LAN
To access the web interface of your instrument, you must determine its IP address on your
TCP/IP network.
Note: Discovery works only for devices on the same subnet.
We recommend that you run Data Translation’s Eureka Discovery Utility that is provided with
the instrument to locate your instrument on the network quickly. Alternatively, you can use
other LXI discovery tools, such as Agilent Connection Expert, if you have them installed on
your computer. Or you can check your router’s address assignments or locate the instrument’s
MAC (Ethernet hardware) address in your DHCP server log.
Running the Eureka Discovery Utility
To use the Eureka Discovery Utility, from the Windows Start menu, click Programs -> Data
Translation, Inc -> Instrument Support -> Eureka LXI Instrument Discovery.
A screen similar to the one shown in Figure 31 appears.
Figure 31: Eureka LXI Discovery Utility
If you are having trouble seeing your instrument in this list, check your Windows firewall
settings using the information in the next section; otherwise, skip this section and continue
with “Launching the Web Interface” on page 78.
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Chapter 5
Configuring Windows Firewall Settings
If you are having trouble seeing your instrument using the Eureka Discovery Utility, check
your Windows firewall settings by doing the following:
1. Right click in the tile bar of the Eureka Discovery Utility.
The following menu options appear:
2. Click the Firewall Configuration... option.
The following window appears:
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Configuring the Instrument Using the Web Interface
3. On the left side of the window, select Turn Windows Firewall on or off, select Tur n O n
Windows Firewall setting for proper operation of the Eureka Discovery Utility, and click
OK.
4. On the left side of the window, select Allow a program or feature through Windows
Firewall, ensure that Eureka LXI Instrument Discovery is included in the list of exceptions, and click OK.
5. If Eureka LXI Instrument Discovery is not included in the exception list, add the utility to
the list of exceptions by doing the following:
a. Click Allow another program...
b. Browse to C:\Program Files\Data Translation\Instrument Support\Eureka.exe,
and click Open.
The Eureka LXI Instrument Discovery utility appears in the window.
c.Click Add to add the utility to the list of exceptions.
d. Click OK to exit from the Windows Firewall Configuration menu.
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Chapter 5
Launching the Web Interface
From the Eureka utility, double-click the appropriate IP address to open the web pages for
your instrument using your default web browser. Alternatively, you can enter the IP address
of your instrument directly in your Internet Explorer address bar to see the instrument’s web
interface.
The main web page, similar to the following screen, shows information about your instrument
on the network:
78
Note: If your browser does not support Java, the Measurement & control -> Acquisition
and Measurement & control -> Digital input pages of the web interface are not supported.
To acquire and view input data, use the QuickDAQ application instead.
If you have multiple instruments connected to the network, you can click "Turn ON front
panel identification indicator" to light the LAN LED on the instrument, described on page 40,
to indicate the device you are using.
To change the description, IP address, or time source associated with the instrument, click the
Modify
links to navigate to the LAN Configuration page, described on page 79.
Page 79
Configuring the Instrument
Web pages are provided for configuring the following aspects of your instrument:
• Local Area Network (LAN) settings
• Channels that you want to measure
•Scan rate
•Filter
•Alarm limits
• Digital I/O lines
LAN Configuration
Use the Configuration -> LAN web page to configure the Local Area Network (LAN) settings
for the instrument. A screen similar to the following appears:
Configuring the Instrument Using the Web Interface
When you first access your instrument, the LAN settings that the instrument obtained
through DHCP or AutoIP should be sufficient. If you need to make changes later, click the
Modify button to enable changes. Contact your system administrator and view the
instrument’s built-in help pages to determine the correct LAN settings.
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Chapter 5
Note: If you want to assign a static IP address, ensure that you uncheck the checkbox called
Automatic private IP address enabled.
When you click Modify, you must supply a password for the instrument.
The username is admin; it cannot be changed. The default password is admin. You can change
the password on this page.
Note that the new password is saved in permanent memory in the instrument and goes into
effect after the instrument reboots. If you are prompted for a password before the instrument
reboots, you must enter your original password. The web interface, IVI-COM driver, and SCPI
interface use the same password. You can also configure the password using the IVI-COM
driver or through SCPI commands.
You are prompted for this password any time the instrument’s configuration is changed or
when an attempt is made to start or stop a scan. This mechanism relies on features in the
HTTP standard to prevent unauthorized users from reconfiguring or operating the
instrument. Note, however, that authentication is not required to view the instrument’s
configuration or scan results.
Note: The DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments with firmware
version 2.2.3.1 or greater use the default user name admin and the default password admin.
Firmware version 2.2.3.1 and greater support password-protected commands. Therefore, you
must enter the appropriate password to change the instrument’s configuration or to start and
stop a scan.
If the firmware version for these instruments is less than 2.2.3.1, then the default user name is
sysadmin and the default password is user. Firmware versions less than 2.2.3.1 do not
support password-protected commands. Therefore, you are not prompted to enter a
password to change the instrument’s configuration or to start or stop a scan.
Specify the time zone that is used by the instrument as an offset (either + or –) from GMT
(Greenwich Mean Time). The specified hour and minute is added to the UTC (Coordinated
Universal Time)
minutes sets the current time zone used by the instrument to five hours and 0 minutes behind
GMT.
time that is maintained by the instrument. For example choosing –5 hours, 0
Channel Configuration
Use the Configuration -> Channel web page to enable the channels that you want to measure,
specify the sensor to use for each channel, and add a label to describe each channel, if desired.
A screen similar to the following appears:
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Configuring the Instrument Using the Web Interface
To change your channel configuration, do the following:
1. Under Enable Channel, check the boxes next to the channels that you want to collect data.
You can use the Enable All and Disable All buttons for quick configuration of many
channels.
2. Under Type , select the sensor type for each configured channel from the drop-down list
boxes. If all the channels are of the same type (thermocouple, RTD, or voltage), you can
use the Set all button to change all channels to the sensor type specified in the heading’s
drop-down list box.
3. Describe the channels, if desired, by entering text in the Label field corresponding to the
channel that you want to describe.
4. Click Save configuration to apply your changes. If you do not save before leaving this
page, your changes are lost.
You c a n als o clic k the Discard changes button (before you save) to return to the previous
configuration, if desired.
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Chapter 5
Scan Rate
Use the Configuration -> Scan Rate web page to set the scan rate for all channels on the
instrument. A screen similar to the following appears:
To change your instrument’s scan rate, do the following:
1. Type a value, in Hertz, between the minimum and maximum shown in the Scan Rate
field.
Note: The scan rate that you specify is rounded to the closest "correct" value that the
instrument can accept without error. Internally, the 10 Hz clock is divided by an integer in
the range of 1 to 65535 (the internal clock divider) to determine the closest value. When
you save the scan rate configuration, the actual scan rate is shown.
2. Click Save configuration to apply your changes. If you do not save before leaving this
page, your changes are lost.
You c a n als o clic k the Discard changes button (before you save) to return to the previous
configuration, if desired.
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Filter Configuration
Use the Configuration -> Filter web page to configure the filter type used by the instrument.
A screen similar to the following appears:
Configuring the Instrument Using the Web Interface
You can choose one of the following filter types:
• Raw – No filter. Provides fast response times, but the data may be difficult to interpret.
Use when you want to filter the data yourself.
The Raw filter type returns the data exactly as it comes out of the Delta-Sigma A/D
converters. Note that Delta-Sigma converters provide substantial digital filtering above
the Nyquist frequency.
Generally, the only time it is desirable to use the Raw filter setting is if you are using fast
responding thermocouples, sampling them at higher speeds (> 1 Hz), and need as much
response speed as possible.
• Moving average – (The default filter setting.) Provides a compromise of filter
functionality and response time. This filter can be used in any application.
This low-pass filter takes the previous 16 samples, adds them together, and divides by 16.
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Chapter 5
Alarm Limits Configuration
Use the Configuration -> Limits web page to define alarm conditions for specific enabled
channels that you want to measure. A screen similar to the following appears.
84
If the alarm condition occurs, the specified digital output line is turned on.
To set up limit checking, do the following:
1. Under Limit, click the Enable buttons next to the channels for which you want to define
limits. You can use the Disable All button to quickly stop limit checking on all channels.
For each channel:
2. Enter a value in the Low Limit text box.
3. Enter a value in the High Limit text box.
4. (Optional) Select a Digital Output line to set from the drop-down list box for this channel.
This line is set to 1 when the limit range (high or low) is exceeded.
When multiple channels are configured to set a digital output line, a logical OR condition
exists between them, and any value out of range sets the line to 1.
5. Click Save configuration to apply your changes. If you do not save before leaving this
page, your changes are lost.
Page 85
You c a n als o clic k the Discard changes button (before you save) to return to the previous
configuration, if desired.
Digital Input and Trigger Configuration
Use the Configuration -> Digital Input & Trigger web page to configure the digital input
lines of your instrument:
Configuring the Instrument Using the Web Interface
To change your digital input configuration, do the following:
1. Describe the digital input lines, if desired, by entering text in the Label field
corresponding to the digital input line that you want to describe.
2. To enable use of an external, digital trigger on digital input line 0, click the Enable
checkbox under the External trigger heading.
3. Click Save configuration to apply your changes. If you do not save before leaving this
page, your changes are lost.
You c a n als o clic k the Discard changes button (before you save) to return to the previous
configuration, if desired.
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Chapter 5
Digital Output Configuration
Use the Configuration -> Digital Out web page to configure the digital output lines of your
instrument:
To change your digital output configuration, do the following:
1. Describe the digital output lines, if desired, by entering text in the Label field
corresponding to the digital output line that you want to describe.
2. Click Save configuration to apply your changes. If you do not save before leaving this
page, your changes are lost.
You c a n als o clic k the Discard changes button (before you save) to return to the previous
configuration, if desired.
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Configuring the Instrument Using the Web Interface
Measuring Data and Controlling the Instrument
If your browser supports Java, use the Control web pages start or stop data acquisition on the
sensor channels or to update the value of the digital output line.
Starting and Stopping a Scan
Note: If your browser does not support Java, the Measurement & control -> Acquisition
page of the web interface is not supported. To acquire and view input data, use the
QuickDAQ application instead.
If your browser supports Java, start or stop a scan, using the Measurement & control ->
Acquisition web page.
Press the Start scan button to begin acquiring data from the sensors. The measurements are
displayed on the screen. Press the Stop scan button to stop acquiring data from the sensors.
Notice the following aspects of the display:
• When acquiring data, the Start scan button changes to say Stop scan and the currently
configured scan rate is displayed.
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Chapter 5
• Each box on the Meter tab represents one of the analog input channels, in the same
position as the physical connectors.
• If you configured custom labels for some of the channels, those labels are shown here
rather than the channel numbers.
• Red boxes indicate that the value is out of range for the specified sensor type.
• The values are updated only for the channels that you enabled, and at the scan rate you
configured.
Controlling the Digital Outputs
Use the Measurement & control -> Digital Output web page to view the current state of the
digital output lines, and manually change them if desired. A screen similar to the following
appears:
88
Green indicates that the digital output line/relay is closed; red indicates that the digital output
line/relay is open.
Note: You cannot change the configuration of digital output lines that were configured for
limit checking on the Configuration -> Limits page.
Page 89
Configuring the Instrument Using the Web Interface
To change the status of a digital output line/relay, click the Open/Close toggle buttons under
the Change State heading for the digital output lines that you want to change. You can use
these controls to activate or deactivate an external device based on criteria other than
temperature that you define.
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Chapter 5
Reading the Digital Inputs
Note: If your browser does not support Java, the Measurement & control -> Digital input
page of the web interface is not supported. To acquire and view input data, use the
QuickDAQ application instead.
If your browser supports Java, you can use the Measurement & control -> Digital Input web
page to view the current value of the digital input port while the instrument is scanning. A
screen similar to the following appears:
90
If you configured custom labels for the digital input lines, those labels are shown here.
The Current state LEDs show green if the digital input line is on (relay is closed) or red if the
digital input line is off (relay is open).
Page 91
Downloading Measurements
Note: This section applies only if your browser supports Java. If your browser does not
support Java, downloading data to a file through the web interface is not supported.
If your browser supports Java, ensure that you have associated CSV files with Microsoft Excel
or Notepad, described on page 74, or the data will be displayed in the browser and not saved
to a file.
If your browser supports Java, you can use the File -> Download Measurements web page to
download your measurement results, including timestamp and limit values, if applicable, to
disk. A screen similar to the following appears:
Configuring the Instrument Using the Web Interface
Measurements taken by the instrument are stored in a large circular buffer; when the buffer is
full, the oldest data is overwritten with the most recent data.
To download your data, do the following:
1. Click the Download button on this page.
If scanning has been stopped, all the data in the buffer is downloaded to a
comma-separated CSV file, starting with the most recent data.
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Chapter 5
Most Recent Data
Downloaded Data
Beginning of Buffer
Circular Buffer
End of Buffer
Most Recent Data
Oldest Data
Downloading Data
Beginning of Buffer
End of Buffer
Circular Buffer
If scanning is in progress, a snapshot of the data from the most recent data (at the time
that the Download button was clicked) to the oldest data in the buffer is downloaded to a
comma-separated CSV file.
2. In the resulting dialog box, choose Open or Save.
If you choose Open, the CSV file opens in the associated application (Microsoft Excel
or Notepad).
If you choose Save, you can open the CSV file in Microsoft Excel, Notepad, or other
utilities for analysis at a later time.
Under some circumstances, your data may be displayed in a frame in the browser, or Excel
may open the data in the frame. Change your Microsoft Excel, Microsoft Explorer, and
Internet Explorer settings to turn off these behaviors and open your files directly in Excel.
This section includes the block diagrams for the DT8871U, DT8871, and DT8872 TEMPpoint
instruments, DT8873 VOLTpoint instrument, and DT8874 MEASURpoint instruments.
DT8871U Block Diagram
Figure 32 shows the block diagram of the DT8871U TEMPpoint instrument.
96
Figure 32: Block Diagram of the DT8871U TEMPpoint Instrument
Page 97
DT8871 Block Diagram
Isolation Barrier
Control
FPGA
Embedded
Controller
64 kB
SRAM
1 of 8
Digital Input
Isolators
1 of 8
Digital Output
Isolators
37-Pin D-Shell
Connector
ID ROM
ENet
Link
LED
LAN
LED
RJ45
Calibration
ROM
Limit LED
USB LED*
Open TC LED*
Ethernet
ENet
Activity
LED
Powe r LED
+100 nA Break
Detection
24-Bit
A/D
Isolated
DC-DC
1 of up to 48 Channels
CJC Per
Point
*The USB LED is not used
on this instrument.
Figure 33 shows the block diagram of the DT8871 instrument.
Principles of Operation
Figure 33: Block Diagram of the DT8871 TEMPpoint Instrument
97
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Chapter 6
Isolation Barrier
Control
FPGA
Embedded
Controller
64 kB
SRAM
1 of 8
Digital Input
Isolators
1 of 8
Digital Output
Isolators
37-Pin D-Shell
Connector
ID ROM
ENet
Link
LED
LAN
LED
RJ45
Calibration
ROM
*The USB and Open TC LEDs are not
used on this instrument.
Limit LED
USB LED*
Open TC LED*
Ethernet
ENet
Activity
LED
Power L ED
1
2
3
4
+
–
+425 A
Current Source
2.5 Hz Filter
Sense
Return
24-Bit
A/D
Isolated
DC-DC
1 of up to 48 Channels
DT8872 Block Diagram
Figure 34 shows the block diagram of the DT8872 TEMPpoint instrument.
Figure 34: Block Diagram of the DT8872 TEMPpoint Instrument
98
Page 99
DT8873 Block Diagram
Isolation Barrier
Control
FPGA
Embedded
Controller
64 kB
SRAM
1 of 8
Digital Input
Isolators
1 of 8
Digital Output
Isolators
37-Pin D-Shell
Connector
ID ROM
ENet
Link
LED
LAN
LED
RJ45
Calibration
ROM
*The USB and Open TC LEDs are
not used on this instrument.
Limit LED
USB LED*
Open TC LED*
Ethernet
ENet
Activity
LED
Power L ED
2
1
3
4
+
–
1 M
2.5 Hz Filter
Sense
Return
24-Bit
A/D
Isolated
DC-DC
Gain Select
60
10
1 of up to 48 Channels
Figure 35 shows the block diagram of the DT8873 VOLTpoint instrument.
Principles of Operation
Figure 35: Block Diagram of the DT8873 VOLTpoint Instrument
99
Page 100
Chapter 6
Isolation Barrier
Control
FPGA
Embedded
Controller
64 kB
SRAM
1 of 8
Digital Input
Isolators
1 of 8
Digital Output
Isolators
37-Pin D-Shell
Connector
ID ROM
ENet
Link
LED
LAN
LED
RJ45
Calibration
ROM
*The USB LED is not
used on this
instrument.
Limit LED
USB LED*
Open TC LED*
Ethernet
ENet
Activity
LED
Power L ED
Channels 32-47
1
2
3
4
+
–
+425 A
Current Source
2.5 Hz Filter
Sense
Return
24-Bit
A/D
Isolated
DC-DC
Channels 16-31
2
1
3
4
+
–
1 M
2.5 Hz Filter
Sense
Return
24-Bit
A/D
Isolated
DC-DC
Gain Select
+10 nA Break
Detection
24-Bit
A/D
Isolated
DC-DC
Channels 0 to 15
x20
+
–
CJC Per
Point
60
10
DT8874 Block Diagram
Figure 36 shows the block diagram of the DT8874 MEASURpoint instrument.
100
Figure 36: Block Diagram of the DT8874 MEASURpoint Instrument
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