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Summary of Contents for Data Translation DT8871
- Page 1 Title Page UM-23652-AA User’s Manual for Standard TEMPpoint, VOLTpoint, and MEASURpoint LXI Instruments DT8871, DT8871U, DT8872, DT8873, DT8874...
- Page 2 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.
- Page 3 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.
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Page 5: Table Of Contents
Table of Contents Table of Contents About this Manual ............9 Intended Audience. - Page 6 Contents Warm-Up Time ............. . . 48 Connecting Thermocouple Inputs .
- Page 7 DT8871 Block Diagram........
- Page 8 System Temperature Error for the DT8871 ........
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Page 9: About This Manual
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. -
Page 10: How This Manual Is Organized
About this Manual How this Manual is Organized This manual is organized as follows: • Chapter “Overview,” summarizes the major features of the TEMPpoint, VOLTpoint, and MEASURpoint instruments, as well as the supported software and accessories. • Chapter “Preparing to Use the Instrument,” describes how to unpack the instrument, check the system requirements, install the software, and view the documentation online. -
Page 11: Related Information
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. - Page 12 About this Manual...
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Page 13: Chapter 1: Overview
Overview Hardware Features............Supported Software . -
Page 14: Hardware Features
Chapter 1 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. - Page 15 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 •...
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Page 16: Voltpoint Features
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 •... -
Page 17: Measurpoint Features
Overview 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: ... - Page 18 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) ...
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Page 19: Supported Software
• 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: ... - Page 20 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.
- Page 21 In addition, this utility generates a report that lists the starting and ending calibration values for each channel, allowing traceability. 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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Page 22: Accessories
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. -
Page 23: Getting Started Procedure
Overview Getting Started Procedure The flow diagram shown in Figure 6 illustrates the steps needed to get started using a TEMPpoint, VOLTpoint, or MEASURpoint instrument. This diagram is repeated in each Getting Started chapter; the shaded area in the diagram shows you where you are in the getting started procedure. - Page 24 Chapter 1...
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Page 25: Part 1: Getting Started
Part 1: Getting Started... -
Page 27: Instrument
Preparing to Use the Instrument Unpacking ..............Checking the System Requirements . - Page 28 Chapter 2 Prepare to Use the Instrument (this chapter) Set Up and Install the Instrument (see Chapter 3 starting on page Wire Signals (see Chapter 4 starting on page Configuring the Instrument Using the Web Interface (see Chapter 5 starting on page...
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Page 29: Unpacking
• 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. -
Page 30: Checking The System Requirements
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 •... -
Page 31: Installing The Software
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 more information). -
Page 32: Viewing The Documentation
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. -
Page 33: The Instrument
Setting Up and Installing the Instrument Connecting the Instrument to the LAN ......... . Applying Power . - Page 34 Chapter 3 Prepare to Use the Instrument (see Chapter 2 starting on page Set Up and Install the Instrument (this chapter) Wire Signals (see Chapter 4 starting on page Configuring the Instrument Using the Web Interface (see Chapter 5 starting on page Note: Your TEMPpoint, VOLTpoint, and MEASURpoint instruments are factory-calibrated.
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Page 35: Connecting The Instrument To The Lan
Setting Up and Installing the Instrument Connecting the Instrument to the LAN 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). Connector Figure 7: LAN Connector on the Rear of the Instrument This section describes how to connect your instrument to the LAN. -
Page 36: Connecting To A Site Lan
Chapter 3 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. -
Page 37: Connecting To A Private Lan
Setting Up and Installing the Instrument To Site LAN Computer To Site LAN TEMPpoint, VOLTpoint, or MEASURpoint +5 V Power Supply 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. -
Page 38: Connecting Directly To A Computer
Chapter 3 Computer Ethernet Hub/ Switch TEMPpoint, TEMPpoint, TEMPpoint, TEMPpoint, VOLTpoint, or VOLTpoint, or VOLTpoint, or VOLTpoint, or MEASURpoint MEASURpoint MEASURpoint MEASURpoint +5 V Power +5 V Power +5 V Power +5 V Power Supply Supply Supply Supply 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... -
Page 39: Applying Power
Setting Up and Installing the Instrument Applying Power 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. - Page 40 Chapter 3 Figure 13 shows the location of the LEDs on the front panel of the instrument; a MEASURpoint instrument is shown in this example. Power LED LAN LED Figure 13: LEDs on the Front Panel of the Instrument...
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Page 41: Getting An Ip Address And Host Name
Setting Up and Installing the Instrument 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. -
Page 42: Determining Ethernet Activity
Chapter 3 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. - Page 43 Setting Up and Installing the Instrument Table 1: Using LEDs to Determine Ethernet Activity (cont.) LEDs Color Description ENet Link LED Yellow Ethernet link operational. (on rear panel) Ethernet link not operational. ENet Activity LED Green Network traffic detected. (on rear panel) No network traffic detected.
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Page 44: Resetting The Instrument
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. -
Page 45: Chapter 4: Wiring Signals
Wiring Signals General Wiring Recommendations ..........Warm-Up Time . - Page 46 Chapter 4 Prepare to Use the Instrument (see Chapter 2 starting on page Set Up and Install the Instrument (see Chapter 3 starting on page Wire Signals (this chapter) Configuring the Instrument Using the Web Interface (see Chapter 5 starting on page...
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Page 47: General Wiring Recommendations
Wiring Signals General Wiring Recommendations Keep the following recommendations in mind when wiring signals to a TEMPpoint, VOLTpoint, or MEASURpoint instrument: • Separate power and signal lines by using physically different wiring paths or conduits. • To avoid noise, do not locate the instrument and cabling next to sources that produce high electromagnetic fields, such as large electric motors, power lines, solenoids, and electric arcs, unless the signals are enclosed in a mumetal shield. -
Page 48: Warm-Up Time
Chapter 4 Warm-Up Time For accurate thermocouple measurements, MEASURpoint instruments require a warm-up time of 1 hour for the analog circuitry to stabilize. For accurate RTD measurements, ensure that your RTD sensors and external calibration resistors warm up for 1 minute after the MEASURpoint instrument has been warmed up for 1 hour. -
Page 49: Connecting Thermocouple Inputs
Wiring Signals 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. - Page 50 Chapter 4 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.
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Page 51: Connecting Rtd Inputs
Wiring Signals Connecting RTD Inputs 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. -
Page 52: 4-Wire Rtd Connections
Chapter 4 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. -
Page 53: 3-Wire Rtd Connections
Wiring Signals 3-Wire RTD Connections The 3-wire configuration eliminates one wire from the 4-wire RTD connection. Lead wire resistance (R ) errors in the return wire from –Sense may be introduced unless the voltage drop is essentially equal and opposite to the voltage drop across +Sense. Figure 18 shows a 3-wire RTD connection. - Page 54 Chapter 4 Figure 19 shows a 2-wire RTD connection. RTD Channel Return Current – Sense +Sense Figure 19: 2-Wire RTD Connection...
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Page 55: Connecting Voltage Inputs
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. - Page 56 Chapter 4 Thermocouple Channels Omega Plug (SMPW-U-M) Voltage Input Analog Input 0 Analog Input 0 Return – Signal Source Figure 20: Connecting Voltage Inputs to a Thermocouple Channel...
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Page 57: Connecting Voltage Inputs To Rtd Channels
Wiring Signals Connecting Voltage Inputs to RTD Channels 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. -
Page 58: Connecting Voltage Inputs To Voltage Channels
Chapter 4 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. Voltage Input Channels Shield... - Page 59 Wiring Signals Figure 23 shows how to connect voltage inputs to the DT8873 and DT8874. Voltage Channel – Sense +Sense Shield Vin – Vin + *Pin 2 is no connect Figure 23: Connecting Voltage Inputs 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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Page 60: Connecting Current Loop Inputs
±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 ... - Page 61 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. Figure 24: Connecting Current Loop Inputs to Thermocouple Channels...
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Page 62: Connecting Current Loop Inputs To Rtd Channels
Chapter 4 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 ... -
Page 63: Connecting Current Loop Inputs To Voltage Channels
Wiring Signals Connecting Current Loop Inputs to Voltage Channels 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. -
Page 64: Connecting Digital I/O Signals
Chapter 4 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 Digital I/O Connector... -
Page 65: Connecting Digital Input Signals
Wiring Signals Digital Input 1+ Digital Output 7 Digital Output 7 Digital Input 1 1 20 18 19 37 Digital Input 2+ Digital Output 6 Digital Input 2 Digital Output 6 Digital Input 3+ Digital Output 5 Digital Input 3 Digital Output 5 Digital Input 4+... -
Page 66: Connecting Digital Output Signals
Chapter 4 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 You can use the digital output lines of the instrument to control solid-state or mechanical relays or high-current electric motors. -
Page 67: Using The Web Interface
Configuring the Instrument Using the Web Interface Before Using the Web Interface ..........Locating Your Instrument on the LAN . - Page 68 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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Page 69: Before Using The Web Interface
Configuring the Instrument Using the Web Interface 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. -
Page 70: Javascript
Chapter 5 JavaScript To enable JavaScript (also referred to as Active Scripting), perform the following steps: 1. From the Internet Explorer browser, select Tools -> Internet Options. 2. Click the Security tab. 3. Select Internet, and then click Custom Level. 4. -
Page 71: Local Intranet Zone
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. -
Page 72: Trusted Sites Zone
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:... -
Page 73: Pop-Up Blockers
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 Tools ->Pop-up Blocker. 2. -
Page 74: Associating Csv Files With Microsoft Excel Or Notepad
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 ®... -
Page 75: Locating Your Instrument On The Lan
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. -
Page 76: Configuring Windows Firewall Settings
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. - Page 77 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.
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Page 78: Launching The Web Interface
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. -
Page 79: Configuring The Instrument
Configuring the Instrument Using the Web Interface 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 •... -
Page 80: Channel Configuration
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. - Page 81 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.
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Page 82: Scan Rate
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. -
Page 83: Filter Configuration
Configuring the Instrument Using the Web Interface Filter Configuration Use the Configuration -> Filter web page to configure the filter type used by the instrument. A screen similar to the following appears: You can choose one of the following filter types: •... -
Page 84: Alarm Limits Configuration
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. If the alarm condition occurs, the specified digital output line is turned on. To set up limit checking, do the following: 1. -
Page 85: Digital Input And Trigger Configuration
Configuring the Instrument Using the Web Interface You can also click 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: To change your digital input configuration, do the following: 1. -
Page 86: Digital Output Configuration
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. -
Page 87: Measuring Data And Controlling The Instrument
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 &... -
Page 88: Controlling The Digital Outputs
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. - 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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Page 90: Reading The Digital Inputs
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 &... -
Page 91: Downloading Measurements
Configuring the Instrument Using the Web Interface 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... - Page 92 Chapter 5 Most Recent Data Circular Buffer Downloaded Data Beginning of Buffer End of 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.
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Page 93: Part 2: Using Your
Part 2: Using Your Instrument... -
Page 95: Chapter 6: Principles Of Operation
Principles of Operation Block Diagrams............. . . Analog Input Features . -
Page 96: Block Diagrams
Chapter 6 Block Diagrams 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. 1 of 8... -
Page 97: Dt8871 Block Diagram
1 of up to 48 Channels Ethernet Embedded ENet Controller Activity Calibration Power LED *The USB LED is not used on this instrument. USB LED* Limit LED Open TC LED* ID ROM Figure 33: Block Diagram of the DT8871 TEMPpoint Instrument... -
Page 98: Dt8872 Block Diagram
Chapter 6 DT8872 Block Diagram Figure 34 shows the block diagram of the DT8872 TEMPpoint instrument. 1 of 8 64 kB Digital Input +425 A SRAM Isolated Isolators Current Source DC-DC 1 of 8 2.5 Hz Filter Digital Output Isolators 24-Bit Control FPGA... -
Page 99: Dt8873 Block Diagram
Principles of Operation DT8873 Block Diagram Figure 35 shows the block diagram of the DT8873 VOLTpoint instrument. 1 of 8 64 kB Isolated Digital Input SRAM DC-DC Isolators 2.5 Hz Filter 1 of 8 24-Bit Digital Output Isolators – Sense Control FPGA... -
Page 100: Dt8874 Block Diagram
Chapter 6 DT8874 Block Diagram Figure 36 shows the block diagram of the DT8874 MEASURpoint instrument. 1 of 8 64 kB +10 nA Break Digital Input Isolated SRAM Detection Isolators DC-DC 1 of 8 Digital Output 24-Bit Isolators – RJ45 CJC Per Point ENet... -
Page 101: Analog Input Features
# of Analog Input Type Models Channels Channel Types TEMPpoint DT8871U-8 and DT8871-8 8 thermocouple inputs (numbered 0 to 7) DT8871U-16 and DT8871-16 16 thermocouple inputs (numbered 0 to 15) DT8871U-24 and DT8871-24 24 thermocouple inputs (numbered 0 to 23) -
Page 102: Thermocouple Input Channels
Chapter 6 Table 3: Number and Type of Analog Input Channels (cont.) Instrument # of Analog Input Type Models Channels Channel Types VOLTpoint DT8873-8 8 voltage inputs (numbered 0 to 7) DT8873-16 16 voltage inputs (numbered 0 to 15) DT8873-24 24 voltage inputs (numbered 0 to 23) DT8873-32 32 voltage inputs (numbered 0 to 31) -
Page 103: Cold Junction Compensation
Open Thermocouple Detection Break detection circuitry (+10 nA on the DT8871U and DT8874; +100 nA on the DT8871) is provided for thermocouple channels to ensure that open thermocouples are detected. The Open (OPN) LED on the rear panel lights when this condition occurs; see Figure 14 on page 42 for the location of this LED. -
Page 104: Rtd Channels
Chapter 6 In addition, the software returns the value SENSOR_IS_OPEN (99999 decimal) for any channel that was configured for a thermocouple input and has either an open thermocouple or no thermocouple connected to it. This value is returned anytime a voltage greater than 100 mV is measure on the input, since this value is greater than any legitimate thermocouple voltage. -
Page 105: Out Of Range Data For Thermocouple Channels
Table 5: Supported Input Ranges Instrument Type Models Input Range TEMPpoint DT8871U ±0.75 V for all channels DT8871 ±1.25 V for all channels DT8872 ±1.25 V for all channels VOLTpoint DT8873 ±10 V or ±60 V (software-selectable for each channel) -
Page 106: Out Of Range Data For Rtd Channels
Chapter 6 Out of Range Data for RTD Channels Each RTD type corresponds to an allowable voltage range. If a voltage is measured on the input that is outside of the legal range for the selected RTD type, the channel may be configured for the wrong type of RTD or something other than an RTD may be connected to the channel. -
Page 107: Sample Clock Source
Optionally, you can return your instrument to Data Translation for recalibration. For information on factory recalibration, contact Data Translation at 508-946-5100 (if you are in the USA) or call your local distributor (if you are located outside the USA); see our web site (www.mccdaq.com) for the name and telephone number of your nearest distributor. -
Page 108: Conversion Modes
Chapter 6 Conversion Modes TEMPpoint, VOLTpoint, and MEASURpoint instruments support simultaneous single value and continuous scan conversion modes for reading input measurements. This section describes each of these conversion modes. Simultaneous Single-Value Operations If you want a snapshot of all the analog input channels at one point in time, you can perform a simultaneous single-value operation, also called a single values operation, using SCPI commands. -
Page 109: How Continuous Scan Works
Principles of Operation Table 6: Supported Channels for Continuous Operations Total Number of Channel for Reading Analog Input Channels the Digital Input Port 0 to 7 0 to 15 0 to 23 0 to 31 0 to 39 0 to 47 The channels are read in order from the lowest channel number to the highest channel number in the list of enabled channels;... -
Page 110: Filtering
Chapter 6 Filtering TEMPpoint, VOLTpoint, and MEASURpoint instruments use a Delta-Sigma analog-to-digital converter (ADC) for each analog input channel to provide simultaneous sampling of all inputs. The Delta-Sigma converter operates at 10 Hz effectively providing a filter that rejects 50 Hz and 60 Hz power line frequency components and that removes aliasing, a condition where high frequency input components erroneously appear as lower frequencies after sampling. -
Page 111: Data Format For Voltage Channels
Principles of Operation Data Format for Voltage Channels For voltage channels on a MEASURpoint instrument, a voltage value in the range of ±10 V or ±60 V is returned, depending on how the channel was configured. Note that the maximum input voltage for the ±60 V range cannot be more than 30 Vrms, 42.4 Vpk, 60 VDC. -
Page 112: Digital I/O Features
Chapter 6 Digital I/O Features TEMPpoint, VOLTpoint, and MEASURpoint instruments provide 8 digital input lines and 8 digital output lines that you can use to control external equipment, including solid-state or mechanical relays. This section describes the following digital I/O features: •... -
Page 113: Digital Output Lines
Principles of Operation Digital Output Lines TEMPpoint, VOLTpoint, and MEASURpoint instruments feature eight, latched and isolated digital output lines. The outputs are solid-state relays that operate at ±30 V and 400 mA peak (AC or DC). Switching time is 2 ms maximum. Figure 39 shows the digital output circuitry. - Page 114 Chapter 6...
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Page 115: Chapter 7: Troubleshooting
Troubleshooting General Checklist ............Technical Support . -
Page 116: General Checklist
5. Check that you have wired your signals properly using the instructions in Chapter 6. Search the DT Knowledgebase in the Support section of the Data Translation web site (at www.mccdaq.com) for an answer to your problem. If you still experience problems, try using the information in... - Page 117 IP and subnet addresses. If needed, reset the instrument using the instructions on page The instrument is damaged. Contact Data Translation for technical support; refer to page 118. Intermittent Loose connections or Check your wiring and tighten any loose connections or cushion operation.
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Page 118: Technical Support
Chapter 7 Technical Support Note: TEMPpoint, VOLTpoint, and MEASURpoint instruments have a 1 year warranty from the factory. If you open the instrument’s enclosure, you will void this warranty. If you have difficulty using your TEMPpoint, VOLTpoint, or MEASURpoint instrument, Data Translation’s Technical Support Department is available to provide technical assistance. -
Page 119: If Your Instrument Needs Factory Service
Troubleshooting If Your Instrument Needs Factory Service Most hardware models can be functionally tested, evaluated for repairs (if needed), and calibrated to factory specifications. An RMA # must be obtained from Application Engineering in advance of sending any product back to Measurement Computing. Customers outside of the USA must contact their local distributor for a return procedure. - Page 120 Chapter 7...
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Page 121: Appendix A: Specifications
Specifications Basic Instrument Specifications ..........Thermocouple Specifications . -
Page 122: Basic Instrument Specifications
Appendix A Basic Instrument Specifications Table 8 lists the basic instrument specifications for the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments. For basic environmental specifications, please see page 136. Table 8: Basic Instrument Specifications Feature Specifications Number of channels in channel list... -
Page 123: Thermocouple Specifications
Specifications Thermocouple Specifications Table 9 lists the specifications for thermocouple channels on the DT8871, DT8871U, and DT8874 instruments. Table 9: Thermocouple Specifications Feature Specifications Thermocouple types (software-selectable) B, E, J, K, N, R, S, T A/D resolution 24-bits Sample rate... -
Page 124: System Temperature Error For The Dt8871U And Dt8874
Appendix A System Temperature Error for the DT8871U and DT8874 Table 10 lists the typical accuracy of the DT8871U and DT8874 for each thermocouple type at several temperature points over the dynamic range of the instrument. Table 10: Typical Thermocouple Accuracy of the DT8871U and DT8874 Thermocouple Type Input Temp. - Page 125 Specifications The histograms shown in Figure 40 Figure 41 characterize the Gaussian system noise distribution for each of the available filter types on the DT8871U and DT8874. Note that converting V error to temperature error depends on thermocouple type. For example, a K thermocouple changes approximately 39 V per degrees C;...
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Page 126: System Temperature Error For The Dt8871
Figure 42 Figure 43 characterize the Gaussian system noise distribution for each of the available filter types on the DT8871. Note that converting V error to temperature error depends on thermocouple type. For example, a K thermocouple changes approximately 39 V per degrees C; therefore, a noise level of 10 V adds 0.3 C error (10 V / 39 V) for a type K thermocouple. - Page 127 Specifications Figure 42: System Noise on the DT8871 Using No Software Filter (Raw Filter) Figure 43: System Noise on the DT8871 Using the Moving Average Filter...
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Page 128: Rtd Specifications
Appendix A RTD Specifications Table 13 lists the specifications for RTD channels on the DT8872 and DT8874 instruments. Table 13: RTD Specifications Feature Specifications RTD types (software-selectable) Platinum 100 , 500 , and 1000 A/D converter resolution 24-bits Sample rate 10 Samples/s... -
Page 129: Temperature Specifications
Specifications Temperature Specifications Table 15 lists the temperature specifications for thermocouple channels on the DT8871, DT8871U, and DT8874 instruments. Table 15: Temperature Stability Specifications for Thermocouple Channels Feature Specifications Additional error due to ambient temperature change J-type thermocouple: 0.010C per degree ambient change, typical K-type thermocouple: 0.011C per degree ambient change, typical... - Page 130 Appendix A Table 16 lists the temperature specifications for RTD channels on the DT8872 and DT8874 instruments. Table 16: Temperature Specifications for RTD Channels Feature Specifications System temperature error Pt100: Offset (typical): ±0.03° C Offset (maximum): ±0.30° C RMS noise: 0.03° C Temperature resolution: 0.002°...
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Page 131: Voltage Measurement Specifications
Specifications Voltage Measurement Specifications Table 17 lists the voltage measurement specifications for the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments. Table 17: Voltage Measurement Specifications Feature Specifications Input voltage range (no compensation) DT8871U and DT8874 thermocouple channels: ±0.0750 V DT8871: ±1.2500 V... - Page 132 Table 17: Voltage Measurement Specifications (cont.) Feature Specifications System drift error, zero DT8871U and DT8874 thermocouple channels: ±0.02 V/C typical DT8871: ±0.02 V/C typical DT8872 and DT8874 RTD channels: ±0.10 V/C DT8873 and DT8874 voltage channels: ±0.5...
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Page 133: Isolation And Protection Specifications
Specifications Isolation and Protection Specifications Table 18 lists the isolation and protection specifications for the analog input subsystem on the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments. Table 18: Isolation and Protection Specifications Feature Specifications DT8871U, DT8871, and DT8874 Thermocouple Channels Overvoltage... -
Page 134: Memory Specifications
Appendix A Memory Specifications Table 19 lists the memory specifications for the analog input subsystem on the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments. Table 19: Memory Specifications Feature Specifications Data memory onboard 4 MByte For Data logger built in, maximum time... -
Page 135: Digital I/O Specifications
Specifications Digital I/O Specifications Table 20 lists the specifications for the digital input (DIN) and digital output (DOUT) subsystems on the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments. Table 20: Digital I/O Specifications Feature Specifications Number of digital I/O lines... -
Page 136: Power, Physical, And Environmental Specifications
Appendix A Power, Physical, and Environmental Specifications Table 21 lists the power, physical, and environmental specifications for the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments. Table 21: Power, Physical, and Environmental Specifications Feature Specifications External power requirements +5 V ±0.25V @ 2 A (0.9 mA typical) -
Page 137: Regulatory Specifications
Specifications Regulatory Specifications The DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments are CE-compliant. Table 22 lists the regulatory specifications for the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments. Table 22: Regulatory Specifications Feature Specifications Emissions (EMI) FCC Part 15, Class A... -
Page 138: Connector Specifications
• Thermocouple connectors • RTD connectors • Voltage connectors • Ethernet connector Thermocouple Connectors Table 23 lists the specifications for the thermocouple connectors used on the DT8871, DT8871U, and DT8874 instruments. Table 23: Thermocouple Connector Specifications Feature Specifications Thermocouple jacks Omega plugs SMPW-U-M –... -
Page 139: Rtd Connectors
4-Position screw terminal block header Phoenix Contact 1803293 4-Position screw terminal block plug Phoenix Contact 1803594 Ethernet (RJ45) Connector The Ethernet (RJ45) connector used on the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments is shown in Figure Figure 44: Ethernet (RJ45) Connector... - Page 140 Transmit Data RXD+ Receive Data+ EPWR+ Power from Switch+ EPWR+ Power from Switch+ Receive Data EPWR Power from Switch EPWR Power from Switch Note: DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments do not support Auto-MDIX.
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Page 141: External Power Supply Specifications
Specifications External Power Supply Specifications Table 27 lists the specifications for the EP361 +5 V external power supply that is used with the DT8871, DT8871U, DT8872, DT8873, and DT8874 instruments. Table 27: External Power Supply (EP361) Specifications Feature Specifications Type... - Page 142 Appendix A...
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Page 143: Appendix B: Connector Pin Assignments
Connector Pin Assignments... - Page 144 Appendix B Table 28 lists the pin assignments for the 37-pin digital I/O connector on TEMPpoint, VOLTpoint, and MEASURpoint instruments. Table 28: Digital I/O Connector Pin Assignments Description Description Digital Input 0+ – Digital Input 1+ Digital Input 0– Digital Input 2+ Digital Input 1–...
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Page 145: Appendix C: Configuring Network Settings On
Configuring Network Settings on Your PC Configuring the PC to Use Auto-IP ..........Specifying a Static IP Address for your Instrument . -
Page 146: Configuring The Pc To Use Auto-Ip
Appendix C Configuring the PC to Use Auto-IP To set up the a TEMPpoint, VOLTpoint, or MEASURpoint instrument when the LAN does not support a DHCP server and your PC is configured to use a static IP address, you must temporarily reconfigure the PC to use Auto-IP by performing the following steps: Note: This procedure may differ slightly depending on your computer and the version of Windows you are using. - Page 147 Configuring Network Settings on Your PC 4. IMPORTANT: Write down the IP address and subnet mask that is displayed! You will need this information later. 5. Select Obtain an IP address automatically, and then click OK. 6. Select the Alternate Configuration tab, and ensure that Automatic private IP address is selected.
- Page 148 Appendix C 7. Renew the IP address of the computer. From the Windows Start menu, click Settings ->Network Connections -> Local Area Connection -> Support -> Repair. Or, if you prefer to do this from the command prompt window, click Run from the Windows Start menu, enter cmd, and click OK to bring up the command prompt window.
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Page 149: Specifying A Static Ip Address For Your Instrument
Configuring Network Settings on Your PC Specifying a Static IP Address for your Instrument To specify a static IP address for your TEMPpoint, VOLTpoint, or MEASURpoint instrument, use the LAN Configuration page of the web interface as follows: 1. From the LAN Configuration page, click Modify. 2. -
Page 150: Reconfiguring The Pc To Use A Static Ip Address
Appendix C Reconfiguring the PC to Use a Static IP Address After you have set up your instrument, you can reconfigure your PC to use a static IP address using this procedure: 1. From the Windows Start menu, click Settings, and then click Network Connections. 2. - Page 151 Auto-IP basic instrument specifications calibration channels CJC circuit block diagrams configuration DT8871 conversion modes DT8871U data format for RTD channels DT8872 data format for thermocouple channels DT8873 data format for voltage channels DT8874...
- Page 152 Index digital inputs downloading measurements digital outputs RTD inputs thermocouple inputs encoding data voltage inputs to RTD channels ENet Activity LED voltage inputs to thermocouple channels ENet Link LED voltage inputs to voltage channels environmental specifications connecting to the LAN EP333 cable assembly private LAN EP372 LAN cable...
- Page 153 Index input ranges network settings installing the software NI-VISA prerequisites Notepad instrument web interface Internet Explorer browser settings JavaScript open thermocouple detection pop-up blockers operation modes security levels continuous analog input (scan mode) Internet zone digital I/O Intranet zone simultaneous single-value analog input IP address OPN LED isolation...
- Page 154 Index Java physical Reset pin power resetting the instrument regulatory resolution RJ45 connector analog input digital I/O RTD connectors returning boards to the factory system temperature error RJ45 connector specifications temperature thermocouple router, using with a site LAN thermocouple connectors RTD alpha curves voltage connectors RTD channels...
- Page 155 Index VISA alias VISA resource string voltage connector specifications voltage measurement specifications VXI-11 clients warm-up time web interface alarm limit configuration analog input channel configuration clients controlling the digital outputs digital input and trigger configuration digital output configuration downloading measurements filter configuration LAN configuration measurement and controlling the instrument...
- Page 156 Index...
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