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Chapter 6

Block Diagrams

This section includes the block diagrams for the DT9871U, DT9871, and DT9872 TEMPpoint
instruments, DT9873 VOLTpoint instrument, and DT9874 MEASURpoint instruments.

DT9871U Block Diagram

Figure 28

shows the block diagram of the DT9871U TEMPpoint instrument.

Figure 28: Block Diagram of the DT9871U TEMPpoint Instrument

+10 nA Break

Detection

24-Bit

A/D

Isolated

DC-DC

1 of up to 48 Channels

x20

–

CJC Per

Point

olat

ion B

rri

Control

FPGA

USB 2.0

Processor

64 kB

SRAM

1 of 8

Digital Input

Isolators

1 of 8

Digital Output

Isolators

37-Pin

D-Sh

ell

Con

ector

ID ROM

Calibration

ROM

Limit LED

USB LED

Open TC LED

Power LED

USB 2.0

Содержание DT9871

Страница 1: ...User s Manual for UM 23654 Z Standard TEMPpoint VOLTpoint and MEASURpoint USB Title Page Instruments DT9871 DT9871U DT9872 DT9873 DT9874 ...

Страница 2: ...n any form by any means electronic mechanical by photocopying recording or otherwise without the prior written permission of Measurement Computing Corporation Notice Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without prior written consent from Measurement Computing Corporation Life support device...

Страница 3: ...ons 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 ...

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Страница 5: ...ring to Use the Instrument 25 Unpacking 27 Checking the System Requirements 28 Installing the Software 29 Viewing the Documentation 30 Chapter 3 Setting Up and Installing the Instrument 31 Applying Power 33 Attaching the Instrument to the Computer 35 Connecting Directly to the USB Ports 35 Connecting to an Expansion Hub 38 Configuring the Device Driver 40 Chapter 4 Wiring Signals 41 General Wiring...

Страница 6: ...ument 66 Configure the Channels 68 Configure the Parameters of the Acquisition Config Window 70 Configure the Appearance of the Channel Display Window 72 Configure the Appearance of the Channel Plot Window 73 Configure the Appearance of the Statistics Window 76 Position the Windows 77 Start the Measurement 79 Part 2 Using Your Instrument 81 Chapter 6 Principles of Operation 83 Block Diagrams 84 DT...

Страница 7: ...n 101 Operation Modes 101 Chapter 7 Troubleshooting 103 General Checklist 104 Technical Support 106 If Your Instrument Needs Factory Service 107 Appendix A Specifications 109 Basic Instrument Specifications 110 Thermocouple Specifications 111 System Temperature Error for the DT9871U and DT9874 112 System Temperature Error for the DT9871 114 RTD Specifications 116 Temperature Specifications 117 Vol...

Страница 8: ...Contents 8 Voltage Connectors 127 External Power Supply Specifications 128 Appendix B Connector Pin Assignments 129 ...

Страница 9: ...nt and MEASURpoint LXI Instruments The first part of this manual describes how to install and set up your instrument and verify that the instrument is working properly The second part of this manual describes the features and capabilities of your instrument using the IVI COM instrument driver software Troubleshooting information is also provided Note If you are programming the instrument using the...

Страница 10: ...provides information that you can use to resolve problems with your instrument should they occur Appendix A Specifications lists the specifications of the TEMPpoint VOLTpoint and MEASURpoint instruments Appendix B Connector Pin Assignments describes the pin assignments of the digital I O connector on the TEMPpoint VOLTpoint and MEASURpoint instruments An index completes this manual Conventions Use...

Страница 11: ...al UM 25242 This manual describes how to create a QuickDAQ application to acquire and analyze data from a TEMPpoint VOLTpoint or MEASURpoint instrument IVI foundation www ivifoundation org Omega Complete Temperature Measurement Handbook and Encyclopedia or the Omega Engineering web site http www omega com Both resources provide valuable information on thermocouple types RTD types standards and lin...

Страница 12: ...About this Manual 12 ...

Страница 13: ...13 1 Overview Hardware Features 14 Supported Software 19 Accessories 21 Getting Started Procedure 22 ...

Страница 14: ... 0 and 1 1 of the USB bus The following sections summarize the features of the TEMPpoint VOLTpoint and MEASURpoint USB instruments TEMPpoint Features TEMPpoint instruments include the following models DT9871U DT9871 and DT9872 Figure 1 shows a DT9871U instrument Figure 1 TEMPpoint Instrument The key features of TEMPpoint instruments are as follows DT9871U and DT9871 Configurable analog input chann...

Страница 15: ...ts and returns the data as 32 bit floating point temperature resistance or voltage values Input range of 1 25 V One 24 bit Delta Sigma A D converter per channel for simultaneous high resolution measurements Throughput rate of up to 10 Samples s for all channels Software or external digital trigger on digital input line 0 starts acquisition Auto calibrating front end resets the zero point on each p...

Страница 16: ...hroughput rate of up to 10 Samples s for all channels Software or external digital trigger on digital input line 0 starts acquisition Auto calibrating front end resets the zero point on each power up in addition the instrument supports anytime calibration performing an auto calibration function on software command Measurement Calibration Utility allows you to calibrate the instrument in the field ...

Страница 17: ...JC cold junction compensation input for each thermocouple channel B E J K N R S and T thermocouple types supported the instrument automatically linearizes the measurements and returns the data as a 32 bit floating point temperature values Input range of 0 075 V with 0 25 V RMS A D noise using no software filtering Break detection circuitry to detect open thermocouple inputs Analog Input Channels 1...

Страница 18: ...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 Me...

Страница 19: ... 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 ...

Страница 20: ...pes Cross Spectrum Cross Power Spectral Density Coherence and Coherent Output Power Supports the Exponential response window type Supports the following reference window types Hanning Hamming Bartlett Blackman Blackman Harris FlatTop Exponential Force and Cosine Taper windows Supports real imaginary and Nyquist display functions Allows you to save data in the uff file format DtxMeasurement IVI COM...

Страница 21: ...point 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 mount Kit Mounts one TEMPpoint VOLTpoint or MEASURpoint instrument in a rack EP374 Dual Rack mount Kit Mou...

Страница 22: ...ch Getting Started chapter the shaded area in the diagram shows you where you are in the getting started procedure Figure 6 Getting Started Flow Diagram Set Up and Install the Instrument see Chapter 3 starting on page 31 Wire Signals see Chapter 4 starting on page 41 Verify the Operation of the Instrument see Chapter 5 starting on page 63 Prepare to Use the Instrument see Chapter 2 starting on pag...

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

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Страница 25: ...25 2 Preparing to Use the Instrument Unpacking 27 Checking the System Requirements 28 Installing the Software 29 Viewing the Documentation 30 ...

Страница 26: ...nd Install the Instrument see Chapter 3 starting on page 31 Wire Signals see Chapter 4 starting on page 41 Verify the Operation of the Instrument see Chapter 5 starting on page 63 Prepare to Use the Instrument this chapter ...

Страница 27: ...ocks If an item is missing or damaged contact Data Translation If you are in the United States call the Customer Service Department at 508 946 5100 An application engineer will guide you through the appropriate steps for replacing missing or damaged items If you are located outside the United States call your local distributor listed on Data Translation s web site www mccdaq com Once you have unpa...

Страница 28: ... computer meets the following system requirements Processor Pentium 4 M or equivalent RAM 1 GB Screen Resolution 1024 x 768 pixels Operating System Windows 8 Windows 7 Windows Vista 32 and 64 bit Windows XP SP3 32 bit Disk Space 4 GB Acrobat Reader 5 0 or later for viewing documentation ...

Страница 29: ...he Instrument 29 Installing the Software Install the software for your instrument from the web at https www mccdaq com downloads DTSoftware MEASURpoint The installation program guides you through the installation process ...

Страница 30: ...urement DtxMeasurement IVI Driver 1 1 8 Documentation The following may be helpful when using Adobe Reader To navigate to a specific section of the document click a heading from the table of contents on the left side of the document Within the document click the text shown in blue to jump to the appropriate reference the pointer changes from a hand to an index finger To go back to the page from wh...

Страница 31: ...31 3 Setting Up and Installing the Instrument Applying Power 33 Attaching the Instrument to the Computer 35 Configuring the Device Driver 40 ...

Страница 32: ... recalibration is recommended Refer to page 94 for more information on calibration Set Up and Install the Instrument this chapter Wire Signals see Chapter 4 starting on page 41 Prepare to Use the Instrument see Chapter 2 starting on page 25 Verify the Operation of the Instrument see Chapter 5 starting on page 63 ...

Страница 33: ... to Figure 7 Figure 7 Attaching a 5 V Power Supply to the Instrument 2 Plug the power supply into a wall outlet IMPORTANT For proper grounding of your measurement instrument ensure that you use the power supply and cable EP361 that is provided with the instrument and that you use all three prongs of the cable when connecting it to your wall outlet 3 Press the Power Switch to turn on the instrument...

Страница 34: ...ter 3 34 Figure 8 shows the location of the Power LED on the front panel of the instrument a MEASURpoint instrument is shown in this example Figure 8 Power LED on the Front Panel of the Instrument Power LED ...

Страница 35: ...formation refer to page 38 You can unplug a USB instrument then plug it in again if you wish without causing damage This process is called hot swapping Your application may take a few seconds to recognize an instrument once it is plugged back in You must install the device driver before connecting your instrument to the host computer See page 29 for more information Connecting Directly to the USB ...

Страница 36: ...k Locate and install driver software recommended The popup message Windows needs your permission to continue appears b Click Continue The Windows Security dialog box appears c Click Install this driver software anyway For Windows XP a Click Next and or Finish as required in the wizard Once the firmware is loaded the wizard restarts to initiate the firmware to accept commands b Click Next and or Fi...

Страница 37: ...he power supply and the instrument are attached correctly the USB LED on the rear panel shown in Figure 10 turns green Figure 10 LEDs on the Rear Panel of the Instrument 5 Repeat the steps to attach another TEMPpoint VOLTpoint or MEASURpoint instrument to the host computer if desired USB LED LMT LED OPN LED ...

Страница 38: ...t computer using another USB cable The operating system automatically detects the instrument and starts the Found New Hardware wizard 5 For Windows Vista a Click Locate and install driver software recommended The popup message Windows needs your permission to continue appears b Click Continue The Windows Security dialog box appears c Click Install this driver software anyway For Windows XP a Click...

Страница 39: ...wer Supply 5 V Power Supply USB Cable Expansion Hubs Host Computer Power Supply for Hub USB Cables USB Cable Power Supply for Hub 5 V Power Supply 5 V Power Supply USB Cables TEMPpoint VOLTpoint or MEASURpoint TEMPpoint VOLTpoint or MEASURpoint TEMPpoint VOLTpoint or MEASURpoint TEMPpoint VOLTpoint or MEASURpoint ...

Страница 40: ...EASURpoint instrument do the following 1 If you have not already done so power up the host computer and all peripherals 2 From the Windows Start menu select Settings Control Panel 3 From the Control Panel double click Open Layers Control Panel The Data Acquisition Control Panel dialog box appears 4 Click the name of the instrument that you want to configure and then click Advanced The Configurable...

Страница 41: ...Signals General Wiring Recommendations 43 Warm Up Time 44 Connecting Thermocouple Inputs 45 Connecting RTD Inputs 47 Connecting Voltage Inputs 51 Connecting Current Loop Inputs 56 Connecting Digital I O Signals 60 ...

Страница 42: ...nd Install the Instrument see Chapter 3 starting on page 31 Wire Signals this chapter Verify the Operation of the Instrument see Chapter 5 starting on page 63 Prepare to Use the Instrument see Chapter 2 starting on page 25 ...

Страница 43: ...ectric 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...

Страница 44: ...SURpoint 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 ...

Страница 45: ...ble 1 lists the color designations for the and polarities of the supported thermocouple types for both the ANSI American and IEC International standards For more information on thermocouple standards refer to the following web site http www omega com thermocouples html Table 1 Thermocouple Color Designation Standards Thermocouple Standard Thermocouple Type Wire Color Coding Polarity Wire Color Cod...

Страница 46: ...t is highly recommended that you use only original Omega thermocouple plugs SMPW as connectors from other suppliers may not be equivalent mechanically Refer to page 126 for more information on the connectors If you use connectors from suppliers other than Omega there is a risk that you may mechanically damage the thermocouple connectors on the MEASURpoint or TEMPpoint instrument Thermocouple Chann...

Страница 47: ...nput channels Figure 13 shows the numbering of the screw terminal blocks for RTD connections Figure 13 Screw Terminal Block Numbering for RTD Connections The DT9872 supplies each RTD channel with 425 A of excitation current to prevent self heating The resistance of the RTD circuit increases gradually repeatably and linearly with temperature As the resistance increases the voltage drop across the R...

Страница 48: ...mize 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 RL and thermal heating Wire impedance of up to 100 anywhere in the hookup is automatically cancelled as long as the sense wires are connected...

Страница 49: ...me 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 intr...

Страница 50: ...Chapter 4 50 Figure 16 2 Wire RTD Connection RTD Channel RTD 425 A Current Sense Sense Return RL RL 1 2 4 3 ...

Страница 51: ...nputs to thermocouple input channels RTD input channels and voltage input channels Connecting Voltage Inputs to Thermocouple Channels Figure 17 shows how to connect a differential voltage input to a thermocouple input channel on the DT9871U DT9871 or DT9874 instrument Note On the standard DT9874 instrument channels 0 to 15 correspond to the thermocouple input channels ...

Страница 52: ...Chapter 4 52 Figure 17 Connecting Voltage Inputs to a Thermocouple Channel Voltage Input Omega Plug SMPW U M Analog Input 0 Analog Input 0 Return Signal Source Thermocouple Channels ...

Страница 53: ...nstrument channels 16 to 31 correspond to the RTD input channels Figure 18 Connecting Voltage Inputs to an RTD Channel The input impedance is well over 100 M using the voltage Sense and Sense inputs For best accuracy when connecting voltage inputs use twisted pair wires with a dead ended shield connected to pin 4 of the screw terminal block Vin Vin RTD Channel Sense Sense 1 2 4 3 Shield ...

Страница 54: ...ng voltage inputs Note On the standard DT9874 instrument channels 32 to 47 correspond to the voltage input channels Figure 19 shows the numbering of the screw terminal blocks for voltage input connections Figure 19 Screw Terminal Block Numbering for Voltage Connections Voltage Input Channels 1 Sense 3 Sense 2 No Connect 4 Shield ...

Страница 55: ...age 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 Vin Vin Voltage Input Channel Sense Sense 1 2 4 3 Shield Pin 2 is no connect ...

Страница 56: ...ent loop inputs to thermocouple input channels RTD input channels and voltage input channels Connecting Current Loop Inputs to Thermocouple Channels Thermocouple input channels on the DT9871U and DT9874 have an input range of 0 075 V Therefore you can use a 1 series resistor to measure 0 075 A Similarly you can use a 0 1 series resistor to measure 0 75 A Thermocouple input channels on the DT9871 h...

Страница 57: ...s to Thermocouple Channels 1 series resistor 60 V Circuit Use a 1 series resistor to convert current to voltage For thermocouple channels on the DT9871U and DT9874 1 0 075 A 0 075 V For thermocouple channels on the DT9871 1 1 25 A 1 25 V Thermocouple Channels ...

Страница 58: ... 12 5 A or a 10 shunt resistor to measure 0 125 A Figure 22 shows how to wire your signals to measure a current loop In this example the input is referenced to 60 V Note On the standard DT9874 instrument channels 16 to 31 correspond to the RTD input channels Figure 22 Connecting Current Loop Inputs to RTD Channels 1 shunt resistor Use a 1 shunt resistor to convert current to voltage 1 1 25 A 1 25 ...

Страница 59: ... A on a 100 A range Typical Shunts Vishay WSMS5515 2 m 2W 100A 20mV Vishay CSM2512S 10 m 1W 10A 100mV Deltec MUB 500 50 1 m 25W 500A 50mV Notes On the DT9874 instrument channels 32 to 47 correspond to the voltage input channels Figure 23 shows an example of wiring signals to measure 20 mA using the 10 V input range Figure 23 Connecting a Current Loop Input to a Voltage Channel to Measure 20 mA 250...

Страница 60: ...your TEMPpoint VOLTpoint or MEASURpoint instrument Connect the STP37 to the digital I O connector of the instrument as shown in Figure 24 Figure 24 Connecting the Instrument to the STP37 Figure 25 shows the layout of the STP37 screw terminal panel and lists the assignments of each screw terminal EP333 Cable STP37 Screw Terminal Panel Digital I O Connector ...

Страница 61: ...igital 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 Ou...

Страница 62: ...rrent electric motors Figure 27 shows how to connect digital output signals to line 0 of the instrument to control a motor relay Figure 27 Switching up to 30 V at 400 mA Digital Out 0 Digital Out 0 pin 10 120 V AC or 240 V AC Relay Motor 10 A Fuse Neutral Hot 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 b...

Страница 63: ...re the Channels 68 Configure the Parameters of the Acquisition Config Window 70 Configure the Appearance of the Channel Display Window 72 Configure the Appearance of the Channel Plot Window 73 Configure the Appearance of the Statistics Window 76 Position the Windows 77 Start the Measurement 79 ...

Страница 64: ...nd Install the Instrument see Chapter 3 starting on page 31 Wire Signals see Chapter 4 starting on page 41 Verify the Operation of the Instrument this chapter Prepare to Use the Instrument see Chapter 2 starting on page 25 ...

Страница 65: ... for information on installing the QuickDAQ application This chapter describes how to use QuickDAQ to measure and display temperature and voltage data from a data acquisition device For this example the following sensors are connected to a DT9874 MEASURpoint instrument T thermocouple is connected to analog input channel 0 4 wire Euro PT1000 RTD is connected to analog input channel 8 10 V input sig...

Страница 66: ...mily name 4 By default the application discovers all devices that are available for the specified device family and displays the module name of the USB devices in the drop down list If you want to refresh this list to determine if other devices are available click Refresh 5 Select the module name that corresponds to your instrument and click Add Information about the device including the model num...

Страница 67: ...do the following a Click the Row Selector button for the device b Click the module name in the Name column to highlight it and enter a meaningful name to represent each available device In this example Deskunit is used as the device name 7 Click OK The QuickDAQ interface is displayed ...

Страница 68: ...column enter a meaningful name for each channel For this example enter the following names For analog input channel 0 enter T Therm as the channel name For analog input channel 8 enter PT1000 RTD as the channel name For analog input channel 16 enter Voltage In as the channel name 4 Under the Sensor column select the following sensor types for the analog input channels For analog input channel 0 se...

Страница 69: ...ig Acquisition tab In this example Deg C is used 6 If you know the offset for your calibrated thermocouple and RTD enter it under the EU Offset column For this example leave 0 as the EU offset for the thermocouple and RTD channels and 1000 as the EU offset for the voltage input channel 7 Leave the test point values for each channel unchanged 8 Click Close to close the Channel Configuration dialog ...

Страница 70: ...le In this example QuickDAQ Data hpf is used 4 Leave the Enable Continuous Acquisition checkbox unchecked 5 For Acquisition Duration select 1 minute as the time to acquire the measurement data The amount of available disk space is shown in addition the number of scans in the Acquisition Info area is updated based on the acquisition duration that is selected 6 For X Axis Span enter 5 seconds as the...

Страница 71: ...nsure that the following default settings are used Sampling Frequency 10 Hz Trigger Source Software Temperature Unit Celsius Filter Type Moving Average 9 If desired hide the Acquisition Config window by clicking the Auto Hide pin in the top right corner of the window ...

Страница 72: ... column in the Plot and Data Config window is checked for all three enabled channels 2 Click the Channel Display Style tab and select the color scheme that you want for the Channel Display window In this example black is used for the background color green is used for the foreground color and white is used for the label color 3 Leave the indicator style as 7 segment ...

Страница 73: ... enabled channels b Leave the Show Cursor column unchecked for all three enabled channels c Under Plot Column use the default plot column setting of 1 for all three enabled channels d Under the Signal Group column select A for the thermocouple and RTD channels and select B for the voltage input channel e Under the Color column assign a unique color to each trace 2 Click the Channel Plot Control ta...

Страница 74: ...area click the tab for the Channel Plot window 5 Click the Show Legend control on the toolbar 6 For the top plot in this window change the text for the label on the x axis by doing the following a Right click on the label b Select Edit Label c Enter the following text Thermocouple and RTD Channels 7 For the bottom plot in this window change the text for the label on the x axis by doing the followi...

Страница 75: ...Verifying the Operation of Your Instrument 75 c Enter the following text Voltage Channels The Channel Plot window should appear as follows ...

Страница 76: ...earance of the Statistics window as follows 1 Ensure that the Visible Statistics column in the Plot and Data Config window is checked for all three enabled channels 2 If desired hide the Plot and Data Config window by clicking the Auto Hide pin in the top right corner of the window ...

Страница 77: ...the middle of the display area and the Statistics window is located at the bottom of the display area Perform the following steps to position the Channel Display window at the top of the display area the Channel Plot window in the middle of the display area and the Statistics window at the bottom of the display area 1 Click the tab for the Statistics window drag the window toward the middle of the...

Страница 78: ... of the display area move the mouse over the guide on the bottom of the guide diamond and then release the mouse button The Channel Plot window is now placed in the middle of the display area revealing the Channel Display window at the top of the display area 3 Resize each window as desired ...

Страница 79: ...nfigured the channels and the display area start acquisition and log data to disk by clicking the Record toolbar button Results similar to the following are displayed in the display area If desired you can view the data in Excel by clicking the Open Current Data in Excel toolbar button ...

Страница 80: ...Chapter 5 80 ...

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

Страница 82: ......

Страница 83: ...83 6 Principles of Operation Block Diagrams 84 Analog Input Features 89 Digital I O Features 100 ...

Страница 84: ...ws the block diagram of the DT9871U TEMPpoint instrument Figure 28 Block Diagram of the DT9871U TEMPpoint Instrument 10 nA Break Detection 24 Bit A D Isolated DC DC 1 of up to 48 Channels x20 CJC Per Point Isolation Barrier Control FPGA USB 2 0 Processor 64 kB SRAM 1 of 8 Digital Input Isolators 1 of 8 Digital Output Isolators 37 Pin D Shell Connector ID ROM Calibration ROM Limit LED USB LED Open ...

Страница 85: ...the DT9871 TEMPpoint Instrument Isolation Barrier Control FPGA 64 kB SRAM 1 of 8 Digital Input Isolators 1 of 8 Digital Output Isolators 37 Pin D Shell Connector Calibration ROM 100 nA Break Detection 24 Bit A D Isolated DC DC 1 of up to 48 Channels CJC Per Point USB 2 0 Processor ID ROM Limit LED USB LED Open TC LED Power LED USB 2 0 ...

Страница 86: ...lation Barrier Control FPGA 64 kB SRAM 1 of 8 Digital Input Isolators 1 of 8 Digital Output Isolators 37 Pin D Shell Connector Calibration ROM The Open TC LED is not used on this instrument 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 USB 2 0 Processor ID ROM Limit LED USB LED Open TC LED Power LED USB 2 0 ...

Страница 87: ...nt Isolation Barrier Control FPGA 64 kB SRAM 1 of 8 Digital Input Isolators 1 of 8 Digital Output Isolators 37 Pin D Shell Connector Calibration ROM The Open TC LED is not used on this instrument 1 of up to 48 Channels USB 2 0 Processor ID ROM Limit LED USB LED Open TC LED Power LED USB 2 0 2 1 3 4 1 M 2 5 Hz Filter Sense Return 24 Bit A D Isolated DC DC Gain Select 60 10 ...

Страница 88: ...ators 1 of 8 Digital Output Isolators 37 Pin D Shell Connector Calibration ROM 1 2 3 4 425 A Current Source 2 5 Hz Filter Sense Return 24 Bit A D Isolated DC DC Channels 16 to 31 USB 2 0 Processor ID ROM Limit LED USB LED Open TC LED Power LED USB 2 0 Channels 32 to 47 2 1 3 4 1 M 2 5 Hz Filter Sense Return 24 Bit A D Isolated DC DC Gain Select 60 10 10 nA Break Detection 24 Bit A D Isolated DC DC...

Страница 89: ...ted thermocouple RTD or voltage input depend on the specific instrument model you purchased as shown in Table 2 Table 2 Number and Type of Analog Input Channels Instrument Type Models of Analog Input Channels Channel Types TEMPpoint DT9871U 8 and DT9871 8 8 8 thermocouple inputs numbered 0 to 7 DT9871U 16 and DT9871 16 16 16 thermocouple inputs numbered 0 to 15 DT9871U 24 and DT9871 24 24 24 therm...

Страница 90: ...y be significantly larger than the accuracy specification for the instrument Since each channel has its own 24 bit A D analog inputs are measured simultaneously Refer to page 96 for more information on specifying the channels for a scan Table 3 lists the supported measurement range for each thermocouple type Refer to page 92 for information on the supported input range for voltage measurements VOL...

Страница 91: ...ning CJC values in the data stream This option is seldom used but is provided if you want to implement your own temperature conversion algorithms in software when using continuous operations Refer to page 97 for more information on this feature Open Thermocouple Detection Break detection circuitry 10 nA on the DT9871U and DT9874 100 nA on the DT9871 is provided for thermocouple channels to ensure ...

Страница 92: ... temperature measurement range for these RTD types is 200 C 328 F to 850 C 1562 F You can also measure a resistance value between 0 and 4k Ohms if desired Refer to page 92 for information on the supported input range for voltage measurements By default all channels are configured for voltage inputs You can specify the RTD types for channels using the DT Open Layers Control Panel applet described o...

Страница 93: ...ge range for the selected thermocouple type the software returns the value TEMP_OUT_OF_RANGE_HIGH 88888 decimal Note If you are continuously measuring from a properly configured thermocouple input channel and the thermocouple opens or becomes disconnected the open thermocouple pull up circuit causes the input voltage to rise to approximately 0 7 V over a few seconds In this case the temperature va...

Страница 94: ... allowable voltage range 10 V or 60 V on MEASURpoint instruments You configure the input range for each channel using software If a voltage is measured on the input that is outside of the legal range for that channel the Limit LMT LED on the rear panel of the instrument lights to alert you see page 37 for the location of this LED Resolution TEMPpoint VOLTpoint and MEASURpoint instruments support a...

Страница 95: ...y 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 Using software you can query this setting to determine the actual clock frequency that is used When the continuous operation is started all the channels specified in the channe...

Страница 96: ...nel list You can also read the value of the digital input port through the analog input data stream by specifying the digital input channel in the channel list the number of the digital input channel depends on how many channels the TEMPpoint VOLTpoint or MEASURpoint instrument provides as shown in Table 5 The channels are read in order from the lowest channel number to the highest channel number ...

Страница 97: ...nput sample clock Data is acquired continuously Figure 33 Continuous Scan Mode 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 ...

Страница 98: ...e for an RTD input channel a voltage measurement is selected and the instrument returns a voltage value in the range of 1 25 V If you specify an RTD type of Ohms a resistance value is returned For all other RTD types a temperature value in degrees C or one of the error constants described on page 99 is returned One floating point value is returned for each enabled channel including the digital inp...

Страница 99: ...SOR_IS_OPEN described on page 91 88888 0 TEMP_OUT_OF_RANGE_HIGH described on page 93 and page 94 88888 0 TEMP_OUT_OF_RANGE_LOW described on page 93 and page 94 If any of these constants is reported the A D subsystem continues to acquire data the error condition is cleared when the data falls within range ...

Страница 100: ...isolation described on page 101 Resolution described on page 101 Operation modes described on page 101 Digital Input Lines TEMPpoint VOLTpoint and MEASURpoint instruments feature eight isolated digital input lines Digital inputs operate from 3 to 28 V DC with a switching time of 2 ms maximum Figure 34 shows the digital input circuitry a 2 2 k resistor is used in series with the LED in the opto iso...

Страница 101: ... includes channel to channel functional isolation of up to 60 V between digital I O lines Resolution Each TEMPpoint VOLTpoint and MEASURpoint instrument provides 8 bits of resolution for the digital input port to accommodate the 8 digital input lines and 8 bits of resolution for the digital output port to accommodate the 8 digital output lines These lines are organized as isolated dedicated ports ...

Страница 102: ...Chapter 6 102 ...

Страница 103: ...103 7 Troubleshooting General Checklist 104 Technical Support 106 If Your Instrument Needs Factory Service 107 ...

Страница 104: ...ager uninstall any unknown devices showing a yellow question mark Then install the USB device drivers and reconnect your USB instruments to the computer Instrument does not respond The instrument configuration is incorrect Check the configuration of your device driver see the instructions in Chapter 3 The instrument is damaged Contact Data Translation for technical support refer to page 106 Interm...

Страница 105: ...ty described on page 16 or 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 of 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 USB 2 0 is not recognized Your operating system ...

Страница 106: ...ovide technical assistance To request technical support go to our web site at https www mccdaq com and click on the Support link When requesting technical support be prepared to provide the following information Your product serial number The hardware software product you need help on The version of the MEASURpoint Software that you are using Your contract number if applicable If you are located o...

Страница 107: ... 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 Calibration certificates for most analog models can be obtained for a fee certificate must be requested at time of RMA assignment ...

Страница 108: ...Chapter 7 108 ...

Страница 109: ...ement Specifications 119 Isolation and Protection Specifications 121 Memory Specifications 122 Digital I O Specifications 123 Power Physical and Environmental Specifications 124 Regulatory Specifications 125 Connector Specifications 126 External Power Supply Specifications 128 Note All analog input specifications are based on the Moving Average filter type ...

Страница 110: ...onmental specifications please see page 124 Table 7 Basic Instrument Specifications Feature Specifications Number of channels in channel list Up to 48 analog input channels and one digital input port A D converter type High stability 24 bit Sigma Delta Measurement category ratings Do not connect to signals or use for measurements within measurement categories II III or IV ...

Страница 111: ...hermocouple types software selectable B E J K N R S T A D resolution 24 bits Sample rate 10 Samples sa a Older versions of the DT9871 instrument may support a maximum sampling rate of 7 5 Samples s Thermal disturbance channel to channel None Upscale break detection current DT9871U and DT9874 DT9871 10 nA 100 nA System temperature error DT9871U and DT9874 DT9871 See Table 9 and Table 10 on page 112...

Страница 112: ...17 C 0 16 C 0 15 C 0 18 C 0 18 C 0 23 C 0 15 C 500 C 0 15 C 0 15 C 0 15 C 0 18 C 0 17 C 0 21 C 0 15 C 700 C 0 15 C 0 15 C 0 16 C 0 18 C 0 18 C 0 17 C 0 16 C 900 C 0 15 C 0 17 C 0 17 C 0 18 C 0 18 C 0 19 C 0 16 C 1100 C 0 15 C 0 16 C 0 19 C 0 18 C 0 18 C 0 16 C 1400 C 0 18 C 0 18 C 0 17 C Table 10 Maximum Thermocouple Accuracy of the DT9871U and DT9874 Input Temp Thermocouple Typea a Conditions for...

Страница 113: ...erting 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 0 1 V adds less than 0 003 C error 0 1 V 39 V for a type K thermocouple Figure 36 System Noise on the DT9871U and DT9874 Using No Software Filter Raw Filter Figure 37 System Noise on the DT9871U and DT9874 Using the Moving Average Filter ...

Страница 114: ... 39 V for a type K thermocouple Table 11 Typical Thermocouple Accuracy of the DT9871 Input Temperature Thermocouple Typea a Conditions for accuracy measurements MEASURpoint warm up time of 1 hour Inclusive of typical 0 2 C CJC error maximum CJC error is 0 3 C Exclusive of thermocouple errors J K T E S R B N 100 C 0 33 C 0 37 C 0 38 C 0 31 C 0 44 C 0 C 0 30 C 0 33 C 0 33 C 0 28 C 1 12 C 1 14 C 0 39...

Страница 115: ...Specifications 115 Figure 38 System Noise on the DT9871 Using No Software Filter Raw Filter Figure 39 System Noise on the DT9871 Using the Moving Average Filter ...

Страница 116: ... of 7 5 Samples s Supported temperature range 200 to 850 C European standard Current source Absolute current Drift Drift per year 425 A 0 5 at 25 C calibrated in firmware 10 ppm C maximum 100 ppm typical Internal reference 1 250 0 002 V Thermal disturbance channel to channel None Supported RTD alpha curves See Table 13 Table 13 Supported RTD Alpha Curves Alpha Average Temperature Coefficient of Re...

Страница 117: ...thermocouple R type thermocouple S type thermocouple T type thermocouple a Includes the A D reference gain and CJC errors 0 010 C per degree ambient change typical 0 011 C per degree ambient change typical 0 014 C per degree ambient change typical 0 010 C per degree ambient change typical 0 011 C per degree ambient change typical 0 012 C per degree ambient change typical 0 012 C per degree ambient...

Страница 118: ...r 0 80 Cb Offset typical 0 007 C Offset maximum 0 07 C RMS noise 0 007 C Temperature resolution 0 0004 C Maximum system error 0 16 Cb Offset typical 0 003 C Offset maximum 0 03 C RMS noise 0 003 C Temperature resolution 0 0002 C Maximum system error 0 08 Cb b Includes a maximum linearity error of 10 ppm and a calibration setup error of 10 ppm Users must be aware that subtle resistor value toleranc...

Страница 119: ... DT9871U and DT9874 thermocouple channels DT9871 DT9872 and DT9874 RTD channels DT9873 and DT9874 voltage channels 5 M typical 5 M typical 100 M 1 M Power ON or OFF Input common mode voltage 60 VDC 30 VAC Common mode rejection 60 Hz and 50 Hz 150 dB Coupling DC System linearity DT9871U and DT9874 thermocouple channels DT9871 DT9872 and DT9874 RTD channels DT9873 and DT9874 voltage channels 0 005 0...

Страница 120: ...ltage channels 4 ppm C 4 ppm C 10 ppm C 15 ppm C A D reference Drift Drift per year 8 ppm C maximum 100 ppm typical Full scale long term stability DT9871U and DT9874 thermocouple channels DT9871 DT9872 and DT9874 RTD channels DT9873 and DT9874 voltage channels 100 ppm year typical 100 ppm year typical 0 05 C per year 0 C 0 27 C per year full scale temperature 100 ppm year typical Warm up time for ...

Страница 121: ...withstand DT9872 and DT9874 RTD Channels Overvoltage Protection Power On Off Pin 1 referenced to pin 4 Pin 2 referenced to pin 4 Pin 3 referenced to pin 4 Pin 1 2 or 3 referenced to earth ground 4 Vb 40 V 20 V 30 VAC 42 4 Vpk 60 VDC max a b Determined by internal protection diodes to the power supply No damage occurs if current is limited to 10 mA DT9873 and DT9874 Voltage Input Channels Overvolta...

Страница 122: ... logger built in maximum time before old data is overwrittena 48 channels 10 Hz 48 channels 1 Hz 48 channels 0 1 Hz a Assumes limit detection is off for all channels and for thermocouple channels assumes CJC data is not collected If power fails all temperature data in the system is lost The channel input type and filter settings are still available after power on but the channel and digital I O la...

Страница 123: ... Input type High input voltage Low input voltage High input current Low input current Termination DC 3 to 28 V 1 5 V 2 2 k resistor to 1 2 V 2 2 k resistor to 1 2 V Series 2 2 k Outputs Output type Output driver High output Low output Breakdown voltage Contact impedance Solid state relay CMOS 30 V 0 4 V 400 mA 60 V 1 Isolation voltage To computer ground Channel to channel 30 VAC 42 4 Vpk 60 VDC ma...

Страница 124: ...ions USB power 5 V Standby 5 V Power On 5 V Enumeration 500 A maximum 360 A typical 2 mA maximum 1 mA typical 2 mA maximum 1 mA typical External power requirements 5 V 0 25V 2 A 0 9 mA typical Physical Dimensions of enclosure Weight 88 14 H x 212 85 mm W x 211 43 mm D 1704 g Environmental Operating temperature range Storage temperature range Relative humidity Altitude Pollution degree Indoor use o...

Страница 125: ... 61326 1 2013 IEC 61326 1 2012 Class A Electrical Equipment for Measurement Control and Laboratory Use EMC Requirements EN61000 4 2 2009 Electrostatic Discharge ESD 4 kV contact discharge 8 kV air discharge 4 kV horizontal and vertical coupling planes EN61000 4 3 2006 Radiated electromagnetic fields 3 V m 80 to 1000 MHz 3 V m 1 4 GHz to 2 GHz 1 V m 2 GHz to 2 7 GHz EN61000 4 4 2004 Electrical Fast...

Страница 126: ...mocouple type SMPW T M For T thermocouple type SMPW E M For E thermocouple type SMPW S M For S thermocouple type SMPW R M For R thermocouple type SMPW B M For B thermocouple type SMPW N M For N thermocouple type Thermocouple connector Omega part PCC SMP U 100 R CE ROHS CAUTION When connecting inputs to the thermocouple connectors on a MEASURpoint or TEMPpoint instrument it is highly recommended th...

Страница 127: ... DT9871 DT9871U DT9872 DT9873 and DT9874 instruments Table 23 RTD Connector Specifications Feature Specifications 4 Position screw terminal block header Phoenix Contact 1803293 4 Position screw terminal block plug Phoenix Contact 1803594 Table 24 Voltage Connector Specifications Feature Specifications 4 Position screw terminal block header Phoenix Contact 1803293 4 Position screw terminal block pl...

Страница 128: ... V AC Input current TPES22 050400 TPEMG24 S050400 7 Typical 0 38 A at 115 V AC 0 15 A at 230 V AC Typical 0 347 A at 115 V AC 0 215 A at 230 V AC Frequency 47 to 63 Hz Inrush current TPES22 050400 TPEMG24 S050400 7 35 A at 230 V AC typical or less than 30 A by adding thermistor 6 274 A RMS at 230 V AC Output voltage 5 V DC Output current 4 0 A Output wattage TPES22 050400 TPEMG24 S050400 7 Typical...

Страница 129: ...129 B Connector Pin Assignments ...

Страница 130: ...nput 4 23 Digital Input 3 6 Digital Input 5 24 Digital Input 4 7 Digital Input 6 25 Digital Input 5 8 Digital Input 7 26 Digital Input 6 9 Not Connected 27 Digital Input 7 10 Digital Output 0 28 Not Connected 11 Digital Output 1 29 Digital Output 0 12 Digital Output 2 30 Digital Output 1 13 Digital Output 3 31 Digital Output 2 14 Digital Output 4 32 Digital Output 3 15 Digital Output 5 33 Digital ...

Страница 131: ...ring current loop inputs to RTD channels 58 current loop inputs to thermocouple channels 56 current loop inputs to voltage channels 59 digital inputs 61 digital outputs 62 RTD inputs 47 thermocouple inputs 45 voltage inputs to RTD channels 53 voltage inputs to thermocouple channels 51 voltage inputs to voltage channels 54 applying power 33 attaching the instrument to the computer 35 B block diagra...

Страница 132: ... floating point data 97 formatting data RTD channels 98 thermocouple channels 98 voltage channels 98 frequency 95 H hardware features 14 high drive digital outputs 62 hot swapping 35 I input ranges 92 installing the software 29 isolation 101 isolation specifications 121 IVI COM driver 20 L LEDs LMT 37 93 94 OPN 37 91 93 Power 33 USB 37 legacy CPL elevated 40 lines digital I O 100 101 LMT LED 37 93...

Страница 133: ...ystem temperature error 112 114 temperature 117 thermocouple 111 thermocouple connectors 126 voltage connectors 127 voltage measurement 119 STP37 screw terminal panel 21 60 system requirements 28 system temperature error 112 114 T technical support 106 temperature error 112 114 temperature specifications 117 thermocouple accuracy specifications 112 114 thermocouple channels 90 data format 98 therm...

Страница 134: ...Index 134 voltage inputs to RTD channels 53 voltage inputs to thermocouple channels 51 voltage inputs to voltage channels 54 warm up time 44 ...

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