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User`s Manual for USB Measurement Instruments

1. 10f8 64 kB Digital Input ON Isolated E SRAM Isolators 5 2 5 Hz Filter Done E 9 B E 1of8 ES O lt gt 6 Bi o x 20 1MQ L 24 Bit Digital Output H ERI 2a A D gt Isolators 30 sv 400 b Control ense 100 gt FPGA 4 Return 10 po S DD Gain Select D 47 qq 1 of up to 48 Channels Hp Power LED USB 2 0 USB LED Calibration Processor Limit LED ROM gt Lo Open TC LED gt USB 2 0 The Open TC LED is not used on this instrument ID ROM Figure 27 Block Diagram of the DT9873 VOLT point Instrument 83 Chapter 6 84 DT9874 Block Diagram Figure 28 shows the block diagram of the DT9874 MEASURpoint instrument 10 nA Break po STRE Detection DE DC SRAN O AW 24 Bit gt gt x20 AID O el CJC Per ji Point b Channels 0 to 15 425 uA EEEN 2 Isolated Current Source DC DC Ei 10 6 25HzFilter 3 20 2 A 24 Bit _ 2 Ly Er gt Control LD 3 A E FPGA Sense E 4 a 4 Return Channels 16 to 31 Isolated i 2 5 Hz Filter DODE p O V 24 Bit gt 20 1MQ A 30 400 Sense 100 4 Return 10 Gain Select Calibration Channels 32 to 47 gt ROM
2. Min Max 4t Max Cho Max Ch8 Max Cho Max Chi Set Set Ga Ga Set ee Be de EE Be we de Be de 88 Be oe de Be de 88 dE EE EE EE EE EE EE EE de Be de 88 Be E da EE EE EE EE EE Max Max Open Digital Output Definition Window 1 2 If you want to change the minimum alarm limit for a channel enter a value in the Min field for that channel and then click Set next to the value that you entered 3 If you want to change the maximum alarm limit for a channel enter a value in the Max field for that channel and then click Set next to the value that you entered 4 If you want to set a digital output line when the alarm limits for a channel are exceeded click the Open Digital Output Definition Window button from the Limit Definition screen The following screen appears 69 Chapter 5 70 Digital Output Definition 5 For each channel select the digital output line bit that you want to turn on when the limits for a channel are exceeded If you do not want to set a digital output line when the alarm limits are exceeded choose none Note You can assign the same digital output line to multiple channels The digital output line is tur
3. 0 44 C oc 40 3 C 30 33 9C 40 33 C 40 28 C 41 12 C 1 14 C 0 39 C 100 C 40 31 C 30 29 C 40 31 C 30 27 C 30 88 C 30 86 C 10 35 C 300 C 40 29 C 30 34 C 40 29 C 30 26 C 30 75 C 30 71 C 1 84 C 30 33 C 500 C 0 28 C 30 31 C 0 26 C 30 71 C 30 66PC 1 2 C 40 33 C 700 C 40 27 C 30 89C 0 27 C 30 68 C 40 63 C 30 92 C 30 33 C 900 C 40 27 C 30 34 C 0 28 C 30 66 C 30 6 C 0 8 C 10 33 C 1100 C 30 28 C 30 34 C 10 64 C 0 58 C 30 71 C 30 34 C 14000 40 62 C 30 56 C 30 64 C a Conditions for accuracy measurements Warm up time of 45 minutes Inclusive of typical 0 2 C CJC error maximum CJC error is 0 3 C Inclusive of typical 5 uV offset error maximum offset error is 50 uV Exclusive of thermocouple errors Exclusive of noise see Figure 34 and Figure 35 for more information about system noise 109 Appendix A 110 The histograms shown in Figure 34 andFigure 35 characterize the Gaussian system noise distribution for each of the available filter types on the DT9871 Note that converting uV error to temperature error depends on thermocouple type For example a K thermocouple changes approximately 39 uV per degrees C therefore
4. 1of8 100 nA Break 64 kB Digital Input pAs 3 a Isolated g P 25 Detect En SRAM o etection DC DC 2 Isolators z 3 oO EE S 10f8 gt lt 2 E 6 Ki oY ae o icc RN O AN zum A D 9 Control gt FPGA CJC Per S D Point 9 4 1 of up to 48 Channels Power LED gt USB20 Pp USBLED Processor PEERS Calibration gt p Limit LED ROM __ Open TC LED USB 2 0 ID ROM Figure 25 Block Diagram of the DT9871 TEMPpoint Instrument 81 Chapter 6 82 DT9872 Block Diagram Figure 26 shows the block diagram of the DT9872 TEMPpoint instrument 64 kB Meis Digital Input x 7 425 uA x SRAM P co Current Source Solated Isolators os DC DC B 09 sm F e ole 8 Md 2 Digital Output H X e 20 AN S Isolators L 24 Bit A D a Control 30 gt FPGA Sense A 8 bo 4 B Return 1 of up to 48 Channels __ Power LED USB 2 0 gt USB LED Calibration Processor Limit LED ROM gt m Open TC LED gt USB 2 0 The Open TC LED is not used on this instrument ID ROM Figure 26 Block Diagram of the DT9872 TEMPpoint Instrument Principles of Operation DT9873 Block Diagram Figure 27 shows the block diagram of the DT9873 VOLTpoint instrument
5. USB 2 0 Processor 1of8 Digital Input aN 3 Isolators 5 O EE 10f8 E gt a 8 Digital Output H E 5 Isolators Lp Power LED gt USBLED gt Limit LED gt Open TC LED is USB 2 0 gt ID ROM Figure 28 Block Diagram of the DT9874 MEASURpoint Instrument Principles of Operation Analog Input Features This section describes the following features of the analog input A D subsystem on TEMPpoint VOLTpoint and MEASURpoint instruments Analog input channels described on this page Input ranges described on page 88 Resolution described on page 90 Calibration described on page 90 Sample clock described on page 91 Trigger source described on page 91 Conversion modes described on page 92 Filtering described on page 93 e Data format described on page 93 Error conditions described on page 94 Analog Input Channels TEMPpoint VOLTpoint and MEASURpoint instruments provide up to 48 analog input channels The number of channels and the channel types supported 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 of Instrument Analog Input Type Models Channels Channel Types TEMPpoint DT9871U 8 and DT9871 8 8 8 thermocouple inputs numbered O to 7 DT9871U 16 and DT9871 16 16
6. The instrument was removed while an operation was being performed Ensure that your instrument is properly connected see the instructions in Chapter 3 Data appears to An open connection exists Check your wiring and fix any open connections see the be invalid instructions in Chapter 4 A transducer is not connected Check the transducer connections see the instructions in to the channel being read Chapter 4 The thermocouple RTD or Check your wiring and ensure that what you specify in voltage input that you software matches your hardware configuration see the connected to the channel does instructions in Chapter 4 not match the software configuration for that channel Your instrument may need The instrument is calibrated at the factory Thereafter recalibration yearly calibration is recommended Use the Measurement Calibration Utility described on page 15 or return your instrument to Data Translation for recalibration For information on factory recalibration contact Data Translation at 508 481 3700 ext 1323 if you are in the USA of call your local distributor if you are located outside the USA see our web site www datatranslation com for the name and telephone number of your nearest distributor USB 2 0 is not Your operating system does not Ensure that you load the appropriate Windows Service recognized have the appropriate Service Pack version 2 for Windows XP If you are unsure of
7. Ground DC DC Reference 1 Isolation Figure 45 When measuring two input signals with channel to channel isolation three ground references are provided signal 0 signal 1 and PC ground New Application Derived from Isolated Channels A typical application of measuring 48 channels of varying voltages from sensors such as batteries thermocouples RTDs pressure sensors etc often must use different instruments because of the various ranges needed Standard ranges of 10 V may handle some applications but not others to the required resolution and accuracy With isolation per channel combinations of channels can be used to measure higher voltage ranges Figure 46 shows a configuration of 2 separate channels ganged up to measure a signal of up to 20 V Normally each input would measure 10 V But by using two identical channels a range of twice that level can be accommodated The output readings of each A D are then summed to give the very accurate result This is possible because the isolation between channels allows the return of the first channel to float up to a level halfway between the input signal This reflects the accurate impedance balance of each input and the high common mode rejection of each stage 135 Appendix C View Settings Help ave Compile andrin C New Form EE Connecting 10V ISO Channels in Series to Create 20V Range CEREBROS DOS Ch24 10V Range Ch25 10V Ensbled Cha To
8. DtxMeasurement IVI COM Driver online help For programmers who are developing their own application programs using a tool other than Measure Foundry this document describes how to use the IVI COM driver to access the capabilities of a TEMPpoint VOLTpoint or MEASURpoint instrument The IVI COM driver works with any development environment that supports COM programming including MATLAB from The MathWorks Microsoft Visual C NET or Visual Basic NET Agilent VEE Pro National Instruments LabVIEW or LabWindows and so on Measure Foundry manual and online help For programmers who purchase Measure Foundry to easily create custom applications for a TEMPpoint VOLTpoint or MEASURpoint instrument these documents describe the functions and capabilities of the Measure Foundry software About this Manual IVI foundation www ivifoundation org e Omega Complete Temperature Measurement Handbook and Encyclopedia or the Omega Engineering web site http www omega com Both resources provide valuable information on thermocouple types RTD types standards and linearization Where To Get Help Should you run into problems installing or using a TEMPpoint VOLTpoint or MEASURpoint instrument the Data Translation Technical Support Department is available to provide technical assistance Refer to Chapter 7 for more information If you are outside the United States or Canada call your local distributor whose number is
9. Resistance at 0 C Organization Standard 0 00385 100 Q British Standard BS1904 1984 Deutschen Institut DIN 43760 1980 fur Normung 0 00392 98 129 Q Scientific Appartus SAMA Manufacturers of RC 4 1966 America 111 Appendix A Isolation and Protection Specifications Table 13 lists the isolation and protection specifications for the analog input subsystem on the TEMPpoint VOLTpoint and MEASURpoint instruments Table 13 Isolation and Protection Specifications Feature Specifications Overvoltage protection power on off DT9871U DT9871 and DT9874 thermocouple channels 40 V DT9872 and DT9874 RTD channels 40 V DT9873 and DT9874 high voltage channels 500 V ESD protection Arc 8kV Contact AkV Isolation voltage to the host computer 500 V Channel to channel isolation 500 V 112 Specifications Memory Specifications Table 14 lists the memory specifications for the analog input subsystem on the TEMPpoint VOLTpoint and MEASURpoint instruments Table 14 Memory Specifications Feature Specifications Data memory onboard 4 MByte For Data logger built in maximum time before old data is overwritten 48 channels 10 Hz 30 minutes 48 channels 1 Hz 5 hours 48 channels 0 1 Hz 50 hours a Assumes limit detection is off for all channels and for thermocouple channels assumes CJC data is not collected If power
10. Crosstalk from one input signal can easily be reflected onto another input The design movement to an A D per channel can help this problem But that is not sufficient in many cases see Figure 42 131 Appendix C 132 Signal Input 1 AID _ Common Digital gt PC Signal Ground Multiplexer PC Ground V Signal Input n Isolation Common Signal Ground Figure 42 Even when using an A D per channel noise can contribute errors to your measurement results To minimize noise and ground loops some newer systems offer isolation between the input signal ground reference and the computer ground This effectively separates the computer ground from the measurement portion of the system But still there is no isolation between input sensor channels which is a common source of error and frustration for user applications Why The assumption is made that all signal sources have the same exact ground reference After all ground is ground isn t it Often this is not the case For example thermocouples for measuring temperature may be dispersed widely throughout an industrial setting such as in the manufacture of air frames or in curing ovens Grounds for these sensors may differ by several volts or even hundreds of volts The resulting common mode voltage causes current to flow in the signal path producing serious errors which are very hard to
11. C 58 F 1750 C 3182 F S 50 C 58 F 1750 C 3182 F T 200 C 328 F 400 C 752 F Refer to Appendix A for the thermocouple accuracy of thermocouple channels over the dynamic range of the instrument Cold Junction Compensation Each thermocouple channel has its own cold junction compensation CJC at the input The software reads the value of the CJC input along with the value of the analog input channel and automatically corrects for errors based on the specified thermocouple type and the thermocouple linearization data stored in onboard ROM A separate multiplexed A D is used to acquire all the CJC input values The software takes care of correlating the CJC measurements with the analog input measurements Note The software provides the option of returning 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 93 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 that open thermocouples are detected The Open OPN LED on the rear panel lights when this condition occurs see Figure 5 on page 34 for the location of this LED 87 Chapter 6 88 In addition the software returns the value SENSOR_IS
12. To rack mount a single instrument order a single rack mount kit Data Translation part number 22927 To rack mount two instruments side by side order a dual rack mount kit Data Translation part number 22735 19 Chapter 1 Getting Started Procedure The flow diagram shown in Figure 1 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 Prepare to Use the Instrument see Chapter 2 starting on page 23 Set Up and Install the Instrument see Chapter 3 starting on page 29 Wire Signals see Chapter 4 starting on page 39 Verify the Operation of the Instrument see Chapter 5 starting on page 61 Figure 1 Getting Started Flow Diagram 20 Part 1 Getting Started 2 Preparing to Use the Instrument POENI O OS N 25 Checking the System Requirements a bd eda 26 Installing the DORIWOCE cores ce heretice eire e d rige ee e dowd e eet odd 27 Viewing tha Documenta on coss cci wee eee a e e T ea Xe RE ERA i 28 23 Chapter 2 24 EA Prepare to Use the Instrument this chapter Set Up and Install the Instrument see Chapter 3 starting on page 29 Wire Signals see Chapter 4 starting on page 39 Verify the Operation of the Instrument see Chapter
13. gt Measurement Application The Device Selection screen is displayed Device Selection Please select a Measurement instrument from the dropdown list below or one of the Device Simulation modes Next click Continue to start measuring Available Measurement Instruments USB DT9871 00 Refresh list State Idle d Model DT9671 46 Powered by Firmware Version 6 7 4 54 measure S N 7481006 Device Simulation Mode MEASURpoint M Device Simulation Mode VOLTpoint TIN Click for more information E Device Simulation Mode TEMPpoint TC Advanced 2 By default the application discovers all TEMPpoint VOLTpoint and MEASURpoint instruments that are available and displays them in the list of Available Instruments If you want to refresh this list to determine if other TEMPpoint VOLTpoint or MEASURpoint instruments are available click Refresh list 3 If your instrument is included in the list of Available Instruments and you want to connect to it select the connect string for the instrument that you want to use from the list of Available Instruments and then go to step 6 Information about the instrument including the scanning status model number firmware version and serial number is displayed 4 If you do not have a TEMPpoint VOLTpoint or MEASURpoint instrument connected or if you want to simulate the operation of an instrument click one of the following selections and then go to step 6 Device
14. a noise level of 10 uV adds 0 3 C error 10 UV 39 uV for a type K thermocouple HISTOGRAM OF SYSTEM NOISE 1200 1000 800 600 400 Number of Occurences 200 20 10 0 10 20 Noise in uV Figure 34 System Noise on the DT9871 Using No Software Filter Raw Filter HISTOGRAM OF SYSTEM NOISE ooo a38g38838 oooO Number of Occurences o o 4 2 0 2 4 Noise in uV Figure 35 System Noise on the DT9871 Using the Moving Average Filter Specifications RTD Specifications Table 11 lists the specifications for RTD channels on the TEMPpoint and MEASURpoint instruments Table 11 RTD Specifications Feature Specifications RTD types software selectable Platinum 100 Q 500 Q and 1000 Q A D converter resolution 24 bits Sample rate 10 Samples s Supported temperature range 200 to 850 C European standard Current source Absolute current 425 uA 0 5 at 25 C calibrated in firmware Drift 10 ppm C maximum Drift per year x 100 ppm typical Internal reference 1 250 0 002 V Thermal disturbance channel to channel None Supported RTD alpha curves See Table 12 on page 111 a Older versions of this instrument may support a maximum sampling rate of 7 5 Samples s Table 12 lists the RTD alpha curves that are supported by RTD channels Table 12 Supported RTD Alpha Curves Alpha Average Temperature Nominal Coefficient of Resistance C
15. 16 thermocouple inputs numbered O to 15 DT9871U 24 and DT9871 24 24 24 thermocouple inputs numbered O to 23 DT9871U 32 and DT9871 32 32 32 thermocouple inputs numbered 0 to 31 DT9871U 40 and DT9871 40 40 40 thermocouple inputs numbered O to 39 DT9871U 48 and DT9871 48 48 48 thermocouple inputs numbered 0 to 47 DT9872 8 8 8 RTD inputs numbered 0 to 7 DT9872 16 16 16 RTD inputs numbered 0 to 15 DT9872 24 24 24 RTD inputs numbered O to 23 DT9872 32 32 32 RTD inputs numbered O to 31 DT9872 40 40 40 RTD inputs numbered O to 39 DT9872 48 48 48 RTD inputs numbered O to 47 85 Chapter 6 86 Table 2 Number and Type of Analog Input Channels cont of Instrument Analog Input Type Models Channels Channel Types VOLTpoint DT9873 8 8 8 high voltage inputs numbered O to 7 DT9873 16 16 16 high voltage inputs numbered O to 15 DT9873 24 24 24 high voltage inputs numbered O to 23 DT9873 32 32 32 high voltage inputs numbered O to 31 DT9873 40 40 40 high voltage inputs numbered O to 39 DT9873 48 48 48 high voltage inputs numbered O to 47 MEASURpoint DT9874 16T 16R 16V 48 16 thermocouple inputs numbered 0 to 15 16 RTD inputs numbered 16 to 31 16 high voltage inputs numbered 32 to 47 Thermocouple Input Channels For channels that support thermocouples you can attach a voltage input or any of the following thermocouple types in a mix and match fashi
16. 5 starting on page 61 Preparing to Use the Instrument Unpacking Open the shipping box and verify that the following items are present TEMPpoint VOLTpoint or MEASURpoint instrument USB cable EP361 5V power supply and cable Instrument OMNI CD ROM For D19872 DT9874 and DT9874 instruments a bag of pluggable screw terminable blocks and a screwdriver If an item is missing or damaged contact Data Translation If you are in the United States call the Customer Service Department at 508 481 3700 ext 1323 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 datatranslation com Once you have unpacked your instrument check the system requirements as described in the next section 25 Chapter 2 26 Checking the System Requirements For reliable operation your instrument requires the following PC with Pentium 233 MHz or higher processor Windows XP Windows Vista or Windows 7 documentation For USB Ver 2 0 support make sure that you install the appropriate Service Pack if needed version 2 for Windows XP In addition for some systems you may have to disable standby mode If you are not sure whether you are using USB Ver 1 1 or Ver 2 0 run the Open Layers Control Panel applet described on page 37 One or more USB por
17. D converter for each channel and channel to channel isolation as shown in Figure 38 126 About ISO Channel Technology DC DC Converter 24 bit AD Converter 1500V Isolation Digital Isolation Floating Reference for Sensor 1 DC DC Converter Converter 3 gt Digital Isolation Floating Reference for Sensor 48 Figure 38 ISO Channel Technology Floating Differential Signals ISO Channel technology implements a virtually ideal differential measurement system that reads only the potential difference between the positive and negative terminals of the amplifier For each channel the differential signals are isolated in that they are referenced to a ground reference point that is not connected to earth ground Ground loop problems are eliminated by ensuring that only one ground reference is used for each channel in the measurement system The signal sources are isolated from each other and from the measurement instrument 127 Appendix C 128 Signal Source Measurement System Analog Input Signal Amplifier Analog Input Return G4 eS Common Mode Voltage Figure 39 Differential Signals and Common Mode Voltage When the measurement instrument and signal source are at different ground potentials the difference in potential is called common mode voltage The measurement instrument cannot discern between the signal and the common mode voltage believing that the sum of these voltages i
18. Department of Communications Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de la class A prescrites dans le R glement sur le brouillage radio lectrique dict par le Minist re des Communications du Canada Table of Contents About this Manual ooococcoocconcnoc ehh nnn 9 Intended Audience ceder pe beber ERE da re aed wre le 9 How this Manual is Organized sssssssss eh 9 Conventions Used in this Manual eessseeeeeee nett nee RN 10 Related Information 2I o eee ete ak Fo se pte oe Te ones 10 Where To Get Help ia eee e tesis E sia mes dese cce da ida ul bed pass 11 Chapter 1 Overview oooooooccoccon RR n n nnn 13 Hardware Features eee e A eerte Ea reb ge ate e p e eo UR 14 TEMPpo tnt Features ated Maa tet lathes dit 14 VOLT point Features socios sa OA dee et era he rh Rr DE 15 MEASURpoint Features Di IA AA e EE Rus 16 Supported SoftWare ers Eod eve Facer e d eie nt e ee Mebane sana s 18 Accessories P MM de RA A A AA AA ta eh 19 Getting Started Procedure sicr eiai an aae a eens 20 Part 1 Getting Started 4 cisss asse ener a ER ERERAAI EX ea 21 Chapter 2 Preparing to Use the Instrument oooooccocoocon oo 23 Unpacking vota eer tee ne Woo ELI ed Ree t amate nite i ret ate ree etd 25 Checking the System Requirements sssssssssss eh 26 Installing theSoftware isses n 27 Vi
19. Figure 32 and Figure 33 for more information about system noise The histograms shown in Figure 32 and Figure 33 characterize the Gaussian system noise distribution for each of the available filter types on the DT9871U and DT9874 Note that converting LV error to temperature error depends on thermocouple type For example a K thermocouple changes approximately 39 uV per degrees C therefore a noise level of 0 1 uV adds less than 0 003 C error 0 1 uV 39 uV for a type K thermocouple HISTOGRAM OF SYSTEM NOISE a 1000 z 800 S 600 S 400 S 2001 3 z o 1 pal 1 0 5 0 0 5 1 Noise in uV Figure 32 System Noise on the DT9871U and DT9874 Using No Software Filter Raw Filter 108 Specifications HISTOGRAM OF SYSTEM NOISE 900 800 700 600 500 400 t Number of Occurences 300 200 100 0 t t t IN 0 33 0 17 0 0 17 0 33 Noise in uV Figure 33 System Noise on the DT9871U and DT9874 Using the Moving Average Filter System Temperature Error for the DT9871 Table 10 lists the accuracy of the DT9871 for each thermocouple type at several temperature points over the dynamic range of the instrument Table 10 Calculated Thermocouple Accuracy of the DT9871 Thermocouple Type Input Temperature J K T E S R B N 100 C 40 33 C 30 37 C 40 38 C 40 31 C
20. Pack installed whether you are using USB 2 0 or USB 1 1 run the Open Layers Control Panel applet described in Chapter 3 Standby mode is enabled on your PC For some PCs you may need to disable standby mode on your system for proper USB 2 0 operation Consult Microsoft for more information 101 Chapter 7 Technical Support If you have difficulty using your TEMPpoint VOLTpoint or MEASURpoint instrument Data Translation s Technical Support Department is available to provide technical assistance To request technical support go to our web site at http www datatranslation com and click on the Support link When requesting technical support be prepared to provide the following information e Your product serial number The hardware software product you need help on The version of the Instrument OMNI CD you are using Your contract number if applicable If you are located outside the USA contact your local distributor see our web site www datatranslation com for the name and telephone number of your nearest distributor 102 Troubleshooting If Your Instrument Needs Factory Service If your MEASURpoint instrument must be returned to Data Translation do the following 1 Record the instrument s serial number and then contact the Customer Service Department at 508 481 3700 ext 1323 if you are in the USA and obtain a Return Material Authorization RMA If you are located outs
21. Power 31 USB 34 lines digital I O 96 97 LMT LED 34 89 90 logging data to disk 71 M Measure Foundry 18 Measurement Application 18 configuring 67 defining alarm limits 69 exiting 75 features 63 logging data to disk 71 opening a data file in Excel 72 reading the digital input lines 74 running 64 updating the digital output lines 70 using the Chart Recorder 71 viewing a data file 73 Measurement Calibration Utility 18 mechanical relays controlling 60 memory specifications 113 moving average filter 93 O Open Layers Control Panel applet 26 101 open thermocouple detection 87 operation modes continuous scan mode 92 digital I O 97 OPN LED 34 87 89 opto isolators 96 out of range data high voltage channels 90 Index RTD channels 90 thermocouple channels 89 P physical specifications 118 power applying 31 specifications 118 Power LED 31 protection specifications 112 R rack mounting 19 raw filter 93 recommendations for wiring 41 recording data 71 regulatory specifications 119 requirements 26 resolution analog input 90 digital I O 97 returning instruments to the factory 103 RMA 103 RTD alpha curves 111 RTD channels 88 data format 94 RID connections 2 wire 47 3 wire 46 4 wire 46 RTD connector specifications 120 RTD specifications 111 RTD types 88 S sample clock 91 sample rate 93 SENSOR IS OPEN 88 software packages 18 software trigger 91 solid state relays 97 controlling 60 sourcing
22. V or 400 V per channel e One 24 bit Delta Sigma A D converter per channel for simultaneous high resolution measurements e 500 V galvanic isolation channel to channel and to the host computer to protect signal integrity Throughput rate of up to 10 Samples s for all channels Software or external digital trigger on digital input line 0 starts acquisition e Auto calibrating front end resets the zero point on each power up in addition the instrument supports anytime calibration performing an auto calibration function on software command Measurement Calibration Utility allows you to calibrate the instrument in the field see page 18 for more information on this utility 16 Overview 8 opto isolated digital input lines you can read the digital input port through the analog input data stream for correlating analog and digital measurements 8 opto isolated digital output lines the outputs are solid state relays that operate from 30 V at currents up to 400 mA peak AC or DC 17 Chapter 1 Supported Software The following software is available for use with the TEMPpoint VOLTpoint and MEASURpoint USB instruments Measurement Application This application developed using Measure Foundry lets you do the following Configure your instrument Acquire temperature voltage or resistance data from up to 48 analog input channels Display acquired temperature voltage or resistance data during acquisiti
23. and your measurement system this is called a ground loop see Figure 36 Ground loops contribute noise that can greatly affect the accuracy of your measurements especially when you are trying to measure low level signals precisely Ground loop problems are the most common source of error in all measurements Eliminating these errors therefore is critical when taking high accuracy measurements When a ground loop exists the measured voltage Vout is the sum of the signal voltage Vsource and the ground potential difference Vcm which exists between the signal source ground and the measurement system ground These errors often appear as transients or periodic Grounded Ground referenced signals in the Signal Source Measurement System measurement For example if a ground da loop is formed with 50 Hz or 60 Hz AC power Measurement lines the unwanted AC System Ground signal appears as a periodic voltage error in the measurement Figure 36 Measurement System with a Ground Loop 125 Appendix C ISO Channel Eliminates Ground Loops and Increases Common Mode Rejection ISO Channel technology eliminates ground loop problems by using a differential isolated floating front end As you can see in Figure 37 a floating voltage signal is not referenced to system ground Figure 37 Floating Signals To measure floating signal sources ISO Channel technology uses differential analog input signals a 24 bit Delta Sigma A
24. and car battery testing applications you may want to accurately sense and measure current in a high voltage loop TEMPpoint VOLTpoint and MEASURpoint instruments provide channel to channel isolation of 500 V meaning that each input can be referenced to 500 V The way you connect current loop inputs depends on the channel type you are using This section describes how to connect current loop inputs to thermocouple input channels RTD input channels and high 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 Q series resistor to measure 0 075 A Similarly you can use a 0 1 Q series resistor to measure 0 75 A Thermocouple input channels on the DT9871 have an input range of 1 25 V Therefore you can use a 1 Qseries resistor to measure 1 25 A Similarly you can use a 0 1 Q series resistor to measure 12 5 A or a 10 Oseries resistor to measure 0 125 A Figure 16 shows how to wire your signals to measure a current loop In this example the input is referenced to 80 V Note On the standard DT9874 instrument channels 0 to 15 correspond to the thermocouple input channels 53 Chapter 4 Thermocouple Channel Ch Ae 1 Oseries resistor Circuit _ 80V Use a 1 Q series resistor to convert current to voltage For
25. diagnose and correct Isolating Each Input Oftentimes it is NOT apparent that ground references from various sensors such as thermocouples RTDs strain gages etc are at different voltage potentials Factors that can contribute to these ground differences are extensive wiring from long runs crosstalk from motors or generators or high source impedance from the signal source Without recognizing this extraneous voltage the measurement system sees this noise or common mode voltage as the actual signal These unwanted noise sources lead to measurement errors see Figure 43 About ISO Channel Technology Signal Source Measurement System Analog Input Signal Amplifier Analog Input Return Common Mode Voltage Figure 43 Common mode voltage is present when different ground potentials exist in your measurement system In many applications noise is a fact and a common occurrence To prevent this noise from entering the signal path the signal must be isolated on a channel to channel basis as well as from the PC ground reference Technology breakthroughs now allow channel to channel isolation to be accomplished effectively Using an A D per channel with a DC DC converter for each A D allows each signal input channel to be isolated from one another see Figure 44 With this individual isolation per channel each input channel can now float to its own ground reference Separate channels are then effectively isolated from each o
26. 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 labels and channel limits are lost 113 Appendix A Temperature Stability Specifications Table 15 lists the temperature stability specifications for thermocouple channels on the TEMPpoint and MEASURpoint instruments Table 15 Temperature Stability Specifications for Thermocouple Channels Feature Specifications Additional error due to ambient temperature change J type thermocouple 0 010 C per degree ambient change typical K type thermocouple 0 011 C per degree ambient change typical B type thermocouple 0 014 C per degree ambient change typical E type thermocouple 0 010 C per degree ambient change typical N type thermocouple 0 011 C per degree ambient change typical R type thermocouple 0 012 C per degree ambient change typical S type thermocouple 0 012 C per degree ambient change typical T type thermocouple 0 010 C per degree ambient change typical Warm up time 45 minutes CJC Error 0 2 C Accuracy Corrected in ROM 25 C to zero error Drift per year 50 ppm typical a Includes the A D reference gain and CJC errors Table 16 lists the temperature stability specifications for RTD channels on the TEMPpoint and MEASURpoint instruments Table 16 Temperature Stability Specifications for RTD Channels Feat
27. filtering and 1 25 V for the DT9871 with 5 uV RMS A D noise using no software filtering Break detection circuitry to detect open thermocouple inputs e DT9872 Configurable analog input channels for RTDs and differential voltage inputs easy access jacks for each channel for quick wiring 100 Q 500 Q and 1000 Q platinum RTD types supported using alpha curves of 0 00385 European or 0 00392 American 4 wire 3 wire or 2 wire configurations the DT9872 automatically linearizes the measurements and returns the data as 32 bit floating point temperature resistance or voltage values Input range of 1 25 V e One24 bit Delta Sigma A D converter per channel for simultaneous high resolution measurements e 500 V galvanic isolation channel to channel and to the host computer to protect signal integrity Overview Throughput rate of up to 10 Samples s for all channels Software or external digital trigger on digital input line 0 starts acquisition Auto calibrating front end resets the zero point on each power up in addition the instrument supports anytime calibration performing an auto calibration function on software command Measurement Calibration Utility allows you to calibrate the instrument in the field see page 18 for more information on this utility 8 opto isolated digital input lines you can read the digital input port through the analog input data stream for correlating analog and digital measurements 8 opt
28. for more information on these features 72 Verifying the Operation of Your Instrument Viewing a Data File To view the data that you recorded in an hpf file with the Chart Recorder perform the following steps 1 Click the Load Data File button from the main window or from the File menu select Load Data File You are prompted to select the name of the data file to view 2 Select the name of the data file to view and then click Open The data file is displayed in the File Viewer window 3 You can then scroll through the data change the scale of the display print the data and so on Refer to the online help provided with the Measurement Application for more information about these features 4 When you are finished viewing the data file click Close 73 Chapter 5 Reading Digital Input Values To read the state of the digital input port perform the following steps 1 Click the Digital In button from the main window or from the Windows menu select Digital Input Panel A screen similar to the following appears Digital Input Panel In7 In6 Ins In4 In3 In2 In1 Decimal Value 0 Note The LED indicator turns green when a value of 1 is detected on the digital input line and turns gray when a value of 0 is detected on the digital input line 74 Verifying the Operation of Your Instrument Exiting from the Measurement Application When you finished using the Measurement Application exit f
29. 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 27 for more information Connecting Directly to the USB Ports To connect a TEMPpoint VOLTpoint or MEASURpoint instrument directly to a USB port on your computer do the following 1 Make sure that you have attached a power supply to the instrument 2 Attach one end of the USB cable to the USB port on the rear panel of the instrument 3 Attach the other end of the USB cable to one of the USB ports on the host computer as shown in Figure 4 The operating system automatically detects the instrument and starts the Found New Hardware wizard 33 Chapter 3 5 V Power Supply L 0 Wav VOLT point or MEASURpoint USB Cables Instruments Bn cu Host Computer d LT USB Ports 5 V Power Supply Figure 4 Attaching the Instrument to the Host Computer 4 Click Next and or Finish in the wizard Once the firmware is loaded the wizard restarts to initiate the firmware to accept commands Click Next and or Finish again If the power supply and the instrument are attached correctly the USB LED on the rear panel shown in Figure 5 turns green DATA TRANSLATION CE USB AM Power O o A Jez8 O wo Digital In Out USB LED LMT LE
30. page 92 for more information 97 Chapter 6 98 General Checklist Technical Support If Your Instrument Needs Factory Service cooomocesosrcososcrso e e n Troubleshooting 99 Chapter 7 100 General Checklist Should you experience problems using a TEMPpoint VOLTpoint or MEASURpoint instrument do the following 1 Read all the documentation provided for your product Make sure that you have added any Read This First information to your manual and that you have used this information 2 Check the Instrument OMNI CD for any README files and ensure that you have used the latest installation and configuration information available E B ow Check that your system meets the requirements stated in Chapter 2 Check that you have installed your hardware properly using the instructions in Chapter 3 Check that you have wired your signals properly using the instructions in Chapter 4 Search the DT Knowledgebase in the Support section of the Data Translation web site at www datatranslation com for an answer to your problem If you still experience problems try using the information in Table 6 to isolate and solve the problem If you cannot identify the problem refer to page 102 Table 6 Troubleshooting Problems Symptom Possible Cause Possible Solution Instrument is not recognized You plugged the instrument into your computer before installing the device driver From the Contr
31. thermocouple channels on the DT9871U and DT9874 1 Q 0 075 A 0 075 V For thermocouple channels on the DT9871 1 Q 1 25 A 1 25 V Figure 16 Connecting Current Loop Inputs to Thermocouple Channels Connecting Current Loop Inputs to RTD Channels RID channels on the DT9872 and DT9874 instruments have an input range of 1 25 V Therefore you can use a 1 Oshunt resistor to measure 1 25 A Similarly you can use a 0 1 Q shunt resistor to measure 12 5 A or a 10 Q shunt resistor to measure 40 125 A Figure 17 shows how to wire your signals to measure a current loop In this example the input is referenced to 80 V Note On the standard DT9874 instrument channels 16 to 31 correspond to the RTD input channels 54 Wiring Signals RTD Channel Sense Sense Circuit Use a 1 Q shunt resistor to convert current to voltage 1 Q 1 25 A 1 25 V Figure 17 Connecting Current Loop Inputs to RTD Channels 55 Chapter 4 Connecting Current Loop Inputs to High Voltage Channels High voltage channels on the DT9873 and DT9874 instruments have an input range of 10 V 100 V or 400 V You select the input range for each channel using software Note On older versions of the instrument the input range was fixed and depended on the model you purchased With the 24 bit A D converter high current high side current shunts can be used for resolutions
32. 60 specifications 105 121 basic instrument 106 digital I O 117 environmental 118 isolation and protection 112 memory 113 physical 118 power 118 regulatory 119 RID 111 RTD connectors 120 system temperature error 108 109 temperature stability 114 thermocouple 107 thermocouple connectors 120 voltage connectors 120 voltage measurement 115 STP37 screw terminal panel 19 58 system requirements 26 system temperature error 108 109 T technical support 102 temperature error 108 109 temperature stability specifications 114 thermocouple accuracy specifications 108 109 thermocouple channels 86 data format 94 thermocouple connector specifications 120 thermocouple types 86 trigger source 91 external 91 software 91 troubleshooting procedure 100 technical support 102 troubleshooting table 100 U unpacking 25 USB cable 33 35 USB LED 34 V voltage connector specifications 120 voltage measurement specifications 115 W warm up time 42 wiring signals current loop inputs to high voltage channels 56 current loop inputs to RTD channels 54 139 Index 140 current loop inputs to thermocouple channels 53 digital inputs 59 digital outputs 60 recommendations 41 RTD inputs 45 thermocouple inputs 43 voltage inputs to high voltage channels 50 voltage inputs to RTD channels 50 voltage inputs to thermocouple channels 49 warm up time 42
33. 874 instrument provides 16 thermocouple channels 16 RTD channels and 16 high voltage channels The key features of MEASURpoint instruments are as follows e Analog Input Channels 0 to 15 Configurable channels for thermocouple or differential voltage inputs easy access jacks for each channel for quick wiring One CJC cold junction compensation input for each thermocouple channel B E J K N R S and T thermocouple types supported the instrument automatically linearizes the measurements and returns the data as a 32 bit floating point temperature values Input range of 0 075 V with 0 25 uV RMS A D noise using no software filtering Break detection circuitry to detect open thermocouple inputs e 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 Q 500 Q and 1000 Q platinum RTD types supported using alpha curves of 0 00385 European or 0 00392 American 4 wire 3 wire or 2 wire configurations the DT9872 automatically linearizes the measurements and returns the data as 32 bit floating point temperature resistance or voltage values Input range of 1 25 V e Analog Input Channels 31 to 48 Direct connection of analog input channels for differential voltage inputs removable screw terminal blocks for each channel for quick wiring Software selectable input range of 10 V 100
34. 88 open thermocouple detection 87 out of range data 89 90 resolution 90 RTD specifications 111 RTD types 88 sample clock 91 thermocouple specifications 107 thermocouple types 86 trigger source 91 wiring current loop inputs to high voltage channels 56 wiring current loop inputs to RTD channels 54 wiring current loop inputs to thermocouple channels 53 wiring RTD inputs 45 wiring thermocouple inputs 43 wiring voltage inputs to high voltage channels 50 wiring voltage inputs to RTD channels 50 wiring voltage inputs to thermocouple channels 49 applet Open Layers Control Panel 26 101 application wiring current loop inputs to high voltage channels 56 current loop inputs to RTD channels 54 current loop inputs to thermocouple channels 53 digital inputs 59 digital outputs 60 RTD inputs 45 thermocouple inputs 43 Index voltage inputs to high voltage channels 50 voltage inputs to RTD channels 50 voltage inputs to thermocouple channels 49 applying power 31 attaching the instrument to the computer 33 B block diagrams 80 DT8871 81 DT8871U 80 DT8872 82 DT8873 83 DT8874 84 C cables 33 35 calibration 90 channel to channel isolation 97 CJC circuit 87 clocks analog input 91 cold junction compensation 87 configuring the device driver 37 connecting signals current loop inputs to high voltage channels 56 current loop inputs to RTD channels 54 current loop inputs to thermocouple channels 53 digital inputs 59 digital outputs 60 R
35. C 12 03 C 14 01 C Figure 23 Channel Overview Screen of the Measurement Application Note that the Channel Type field on the left of the screen indicates the type of sensor that is used for the corresponding row of measurement values For example TC represents the values for thermocouple channels e RTD represents the values for RTD channels e Volts represents the values for voltage input channels 66 Verifying the Operation of Your Instrument Changing the Configuration of Your Instrument To change the configuration of your instrument follow these steps 1 Stop acquisition by clicking the Start Stop button from the main window or by clicking Stop Acquisition from the Acquisition menu 2 Click the Configuration menu and then click Change Configuration The Change Configuration screen is displayed Measurement Change Configuration Acquisition Unit for temperature measurements Log Channels to Disk Channel Names 0 Ch TC 0 1 Ch TC 1 2 ChTC2 Mf Ch TC 4 3 Mf Ch TC S Ch TC 3 if chTC6 4 Ch TC 4 54 Ch TC 7 al i5 if Ch TC O if Ch TCA if chTC2 if Ch TC 3 v es E wv r wa ch TC 5 Set all to Type J v Select All DeselectAll g a Acquisition Frequency 10 Hz SHz 2Hz Every 2 Seconds Every 5 Seconds Every 10 Seconds Every Minute Every 2 Minutes Every 5 Minutes 3 Under Unit select the temperature units in which to d
36. D OPN LED Figure 5 Rear Panel of the Instrument 34 Setting Up and Installing the Instrument 5 Repeat the steps to attach another TEMPpoint VOLTpoint or MEASURpoint instrument to the host computer if desired Connecting to an Expansion Hub Expansion hubs are powered by their own external power supply Theoretically you can connect up to five expansion hubs to a USB port on the host computer However the practical number of instruments that you can connect to a single USB port depends on the throughput you want to achieve Each of the hubs supports up to four instruments To connect multiple TEMPpoint VOLTpoint or MEASURpoint instruments to an expansion hub do the following 1 Make sure that you have attached a power supply to the instrument 2 Attach one end of the USB cable to the instrument and the other end of the USB cable to an expansion hub 3 Connect the power supply for the expansion hub to an external power supply 4 Connect the expansion hub to the USB port on the host computer using another USB cable The operating system automatically detects the instrument and starts the Found New Hardware wizard 5 Click Next and or Finish in the wizard Once the firmware is loaded the wizard restarts to initiate the firmware to accept commands Click Next and or Finish again If the power supply and the instrument are attached correctly the USB LED shown in Figure 5 on page 34 turns green 6 Repeat these s
37. DATA TRANSLATION UM 23654 D User s Manual for USB Measurement Instruments TEMPpoint VOLTpoint and MEASURpoint Fourth Edition May 2010 Data Translation Inc 100 Locke Drive Marlboro MA 01752 1192 508 481 3700 www datatranslation com Fax 508 481 8620 E mail info datx com Copyright O 2009 2010 by Data Translation Inc All rights reserved Information furnished by Data Translation Inc is believed to be accurate and reliable however no responsibility is assumed by Data Translation Inc for its use nor for any infringements of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent rights of Data Translation Inc Use duplication or disclosure by the United States Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer software clause at 48 C F R 252 227 7013 or in subparagraph c 2 of the Commercial Computer Software Registered Rights clause at 48 C F R 52 227 19 as applicable Data Translation Inc 100 Locke Drive Marlboro MA 01752 Data Translation is a registered trademark of Data Translation Inc MEASURpoint TEMPpoint VOLTpoint ISO Channel and Measure Foundry are trademarks of Data Translation Inc All other brand and product names are trademarks or registered trademarks of their respective companies R
38. Figure 21 Connecting Digital Inputs 59 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 DC You can use the digital output lines of the instrument to control solid state or mechanical relays or high current electric motors Figure 22 shows how to connect digital output signals to line 0 of the instrument to control a motor relay Instrument Motor Digital I O Connector Relay Controlled by M A Software Fuse pin 10 Digital Out 0 A gt 7 N ET z Hot Neutral o H 120 V AC pin 29 Digital Out 0 or 240 V AC d 30V DC 400 mA Output can switch AC or DC Figure 22 Switching up to 30 V at 400 mA 60 Y Verifying the Operation of Your Instrument LWEPVIBW AR pieni a E a E e RE Rae tere g Rer E I Rer 63 Runmng the Measuienent Applicaton 1a cn A esee er ERES eb ee Fa eret d 64 Changing the Configuration of Your Instrument e s sesers nenene erenneren andes 67 Dip ii EAS AS IEA A cee eee ees 69 Logging Datato DS 00000 dd eem ND eee Mid eiusd 71 Meine a Data PIS o aieia eed nete petet ence etti PEE ente Gm e RR e 73 Reading Digital Input Values occ eret a eer ER eer d 74 Exiting from the Measurement Applieation i cest eeernd ei e e 75 61 Chapter 5 P
39. Simulation Mode MEASURpoint Simulates the operation of a MEASURpoint instrument Device Simulation Mode VOLTpoint Simulates the operation of a VOLTpoint instrument Verifying the Operation of Your Instrument Device Simulation Mode TEMPpoint RTD Simulates the operation of a DT9872 or DT8872 TEMPpoint instrument Device Simulation Mode TEMPpoint TC Simulates the operation of a DT9871 DT9871U DT8871 or DT8871U TEMPpoint instrument When selected the button indicator turns green 5 If your instrument is not included in the list of Available instruments but you want to manually connect to it do the following a Click Advanced The following screen is displayed Advanced Enter the VISA Connect and Option Strings in the fields below VISA Connect String usB DT987101 Set VISA Option String Set b Determine and optionally edit the name of your USB instrument by clicking Start gt Settings gt Control Panel gt Open Layers Control Panel The name of your device is listed c Enter the Open Layers name of your instrument such as USB DT9871 01 as the VISA Connect String for your device and click Set d If you want to simulate the operation of an instrument enter the string simulate true model xxxxxx in the VISA Option String text box and click Set where xxxxxx is the model number of the instrument you want to simulate D19871 DT8871 DT9872 and DT8872 for TEMPpoi
40. TD inputs 45 thermocouple inputs 43 voltage inputs to high voltage channels 50 voltage inputs to RTD channels 50 voltage inputs to thermocouple channels 49 connecting to the host computer 33 using an expansion hub 35 continuous analog input 92 Control Panel applet 26 101 conversion modes 92 digital I O 97 conversion modes continuous scan mode 92 conversion rate 93 customer service 103 137 Index 138 D data encoding 93 data format high voltage channels 94 RTD channels 94 thermocouple channels 94 device driver 37 differential channels 43 45 digital I O channel to channel isolation 97 connecting input signals 59 connecting output signals 60 lines 96 97 operation modes 97 reading the digital input port in the analog data stream 92 resolution 97 specifications 117 subsystem specifications 117 digital trigger 91 E encoding data 93 environmental specifications 118 EP333 cable assembly 19 58 error conditions 94 Excel opening a data file 72 external digital trigger 91 F factory service 103 features 14 FIFO 93 filters 93 floating point data 93 formatting data high voltage channels 94 RTD channels 94 thermocouple channels 94 frequency 91 H hardware features 14 high drive digital outputs 60 hot swapping 33 I input ranges 88 installing the software 27 ISO Channel technology 123 isolation 97 isolation specifications 112 IVI COM driver 18 L LEDs LMT 34 89 90 OPN 34 87 89
41. _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 If the channel is configured for a voltage input not a thermocouple type the Open OPN LED never lights and the SENSOR IS OPEN value is not returned Instead the voltage value is returned If no input is connected to the channel the software returns a value of approximately 0 7 V due to the open thermocouple detection pull up circuit RTD Channels For channels that support RTDs you can attach a voltage input or any of the following RTD types in a mix and match fashion Platinum 100 Pt100 Platinum 500 Q Pt500 or Platinum 1000 Q Pt1000 RTD using an European alpha curve of 0 00385 or an American alpha curve of 0 00392 The supported 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 88 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 on page 37 the Change Configuration dialog in the supplied Measurement Application de
42. accept the license agreement before viewing the documentation You can access the documentation for your instrument from the Windows Start menu as follows For documentation about the TEMPpoint VOLTpoint or MEASURpoint instrument click Programs Data Translation Inc gt Hardware Documentation gt Measurement User s Manual for USB Instruments For documentation on the DtxMeasurement IVI COM driver click Programs gt IVI gt DtxMeasurement gt Documentation For documentation about Measure Foundry click Programs gt Data Translation Inc gt Measure Foundry gt 5 1 gt Measure Foundry User Manual The following may be helpful when using Adobe Reader To navigate to a specific section of the document click a heading from the table of contents on the left side of the document Within the document click the text shown in blue to jump to the appropriate reference the pointer changes from a hand to an index finger To go back to the page from which the jump was made click the right mouse button and Go Back or from the main menu click Document and then Go Back To increase or decrease the size of the displayed document from the main menu click View and then Zoom By default Adobe Reader smooths text and monochrome images sometimes resulting in blurry images If you wish you can turn smoothing off by clicking File and then Preferences General and unchecking Smooth Text and Images 9 Z Setting U
43. adio and Television Interference This equipment has been tested and found to comply with CISPR EN55022 Class A and EN61000 6 1 requirements and also with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Changes or modifications to this equipment not expressly approved by Data Translation could void your authority to operate the equipment under Part 15 of the FCC Rules Note This product was verified to meet FCC requirements under test conditions that included use of shielded cables and connectors between system components It is important that you use shielded cables and connectors to reduce the possibility of causing interference to radio television and other electronic devices Canadian Department of Communications Statement This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian
44. d due to the simultaneous architecture of ISO Channel technology all data is transferred in parallel 129 Appendix C Summary ISO Channel technology offers built in system redundancy to protect your investment if one channel fails the remaining channels are completely unaffected Instruments with ISO Channel technology also adapt to the sensors that they are connected to allowing a different ground reference for each signal without introducing errors For these key reasons ISO Channel technology protects against problems in the field and thereby reduces costs what a great return on your investment 130 About ISO Channel Technology Floating Signal Inputs Offer New Application Advantages Precision measurement systems are often limited in that all inputs are connected to a single ground Typically multiplexer input configurations are set up this way since all signal inputs are connected to the same return Even differential input configurations use the same ground reference The result is that accuracy and flexibility for accurate measurements can be severely compromised when noise or common mode voltage is present see Figure 41 Signal Input 1 2x O Multiplexer AD pc emi Input V PC Ground connor Isolation Signal Ground Figure 41 In multiplexed systems all inputs are connected to a signal ground which can cause errors when noise or common mode voltage is present
45. d Loops sssssse e 125 ISO Channel Eliminates Ground Loops and Increases Common Mode Rejection 126 Floating Differential Signals oooooooooocommorcorcrrara eee 127 Simultaneous Architecture lssseeseseeeeeeee eee 128 Channel to Channel Isolation 00 00 cece cence eee 129 SUMA sui il wi a4 ales wands as Ga A Herd ra 130 Floating Signal Inputs Offer New Application Advantages oooooooocomooccmoo 131 Isolating Each Input iis A A E eed 132 New Application Derived from Isolated Channels 0 00000 135 DUM AL Yee eu E o tue t er viuere 136 MINOX A O O A 137 About this Manual TEMPpoint M is a family of temperature measurement instruments that includes the DT9871U DT9871 DT8871U DT8871 DT9872 and DT8872 This manual describes the DT9871U DT9871 and DT9872 USB models VOLTpoint is a family of voltage measurement instruments that includes the DT9873 and DT8873 This manual describes the DT9873 USB model MEASURpoint a family of mixed temperature and voltage measurement instruments that includes the DT9874 and DT8874 This manual describes the DT9874 USB model Note For information on the LXI models of TEMPpoint VOLTpoint and MEASURpoint refer to the User s Manual for LXI Measurement 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 ma
46. decimal value followed by the OPEN SENSOR 99999 decimal value In this case the OPN LED lights when the open thermocouple is detected and the LMT LED lights when the temperature limit is out of range for the thermocouple type 89 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 For channels configured with a RTD type of voltage the Limit LMT LED on the rear panel of the instrument lights to alert you when the voltage is out of range greater than 1 25 V or less than 1 25 V see Figure 5 on page 34 for the location of this LED For channels configured with an RTD type other than voltage the LMT LED lights when the temperature limit is out of range for the specified RTD type In addition if the input voltage is less than the legal voltage range for the selected RTD type the software returns the value TEMP OUT OF RANGE LOW 88888 0 decimal If the input voltage is greater than the legal voltage range for the selected RTD type the software returns the value TEMP OUT OF RANGE HIGH 88888 0 decimal Out of Range Data for High Voltage Channels Each voltage input channel has an allowable voltage range 10 V 100 V or 400 V You configure the input range
47. e visible 5 From the Time Axis Length drop down list select the time 10 Seconds 1 Minute 5 Minutes 10 Minutes 30 Minutes 1 Hour 2 Hours 4 Hours to use for the time axis 6 If you want to display all the data on a single band leave the Single Band Multiple Band button untouched the button indicator is green If you want to display the data for each channel on a separate band click the Single Band Multiple Band button so that the button indicator turns gray 71 Chapter 5 7 To begin recording data click the Start Recording button You are prompted to name the file in which to store the recorded data The data file has an hpf extension 8 Enter a name for the data file and then click Save The data for each channel is then displayed on the screen and logged to disk ja Measurement Chart Recorder Time Axis Length 10 Seconds LE amp eH gt 2 S T Single Band Multiple Bands lt JL lt gt JC 15 41 42 15 41 43 15 41 44 15 41 45 15 41 Open Last Recording in Excel X tis 1 0 C 2 1 C Stop Recording 9 When you have finished recording click the Stop Recording button 10 If you want to view this data in Microsoft Excel click the button called Open Last Recording in Excel Note The Chart Recorder has other features such as scrolling autoscaling printing and so on Refer to the online help provided with the Measurement Application
48. ection 066 87 RID Channels a RR RE Oe ad E E ESI 88 Input Ranges eese aa gegen Id NAR e vs qu t UHR eb os 88 Out of Range Data for Thermocouple Channels ssssuue 89 Out of Range Data for RTD Channels o ooooococcccoccccnoo or 90 Out of Range Data for High Voltage Channels 0 0000 000005 90 RESOLUTION ize AN EGCRIU AA al GK RNB A get d Roy n aset a 90 Galibration e ose re WORD ad ne CERES DEN CI Nd 90 Contents Sample Clock Source nnna an a ts A o 91 Trigger SQUICE ss Lesser Eina anaa Aaa E ppp ide 91 Conversion Modes sita are ete REA aca 92 Specifying Analog Input Channels 00 0 0 e eee eee 92 How Continuous Scan Works 0 cee cece oc 92 TASA EET 93 Data Format 2 29PM Hb were ee 93 Data Format for Thermocouple Channels oooooocccococccccororoc eee 94 Data Format for RTD Channels 00 0 cece eee eee eens 94 Data Format for High Voltage Channels 00000000000000 94 Error Conditions ii ne ewe E A RU RP eae as 94 Digital T O Features ueteres eet EA PERS A tt e Ro fe RUE 96 Digital Input Lites ina A eese m PR 96 Digital Output Lines idea a m am m a ARE RARE RR RN RA EY 97 Channel to Channel Isolati0M ooooooococoocooccor ee 97 Resol ti nh x exce esee a 97 Operation Modes e such oe rra Y aee a tr ms da ae a bound ca 97 Chapter 7 Troubleshooting ooococcoonnncrn nnn 99 General Checklis
49. ep the following recommendations in mind when wiring signals to a TEMPpoint VOLTpoint or MEASURpoint instrument Separate power and signal lines by using physically different wiring paths or conduits To avoid noise do not locate the instrument and cabling next to sources that produce high electromagnetic fields such as large electric motors power lines solenoids and electric arcs unless the signals are enclosed in a mumetal shield Locate the instrument s front panel as far away as possible from sources of high or low temperatures or strong air currents such as fans Prevent electrostatic discharge to the I O while the instrument is operational When wiring thermocouples select an appropriate wire length and gauge for each thermocouple in general use the shortest wire length and largest gauge for the application to yield best results Use shielded wire for maximum rejection of electrical interference 41 Chapter 4 42 Warm Up Time For accurate thermocouple measurements DT9871U and DT9871 TEMPpoint instruments and thermocouple channels on the DT9874 MEASURpoint instruments require a warm up time of 45 minutes for the analog circuitry to stabilize For accurate high voltage measurements the DT9873 VOLTpoint instruments and high voltage channels on the DT9874 MEASURpoint instruments require a warm up time of 1 hour for the analog circuitry to stabilize For accurate RTD measurements the DT9872 TEMPpoint instrumen
50. eported the A D subsystem continues to acquire data the error condition is cleared when the data falls within range 95 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 Digital input lines described below Digital output lines described on page 97 Channel to channel isolation described on page 97 Resolution described on page 97 Operation modes described on page 97 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 30 shows the digital input circuitry a 2 2 kQ resistor is used in series with the LED in the opto isolator input 2 2K Digital Input 7 1 of 8 Opto Isolators Figure 30 Digital Input Circuitry A digital line is high switch is closed if its value is 1 a digital line is low switch is open if its value is 0 96 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 31 sh
51. ewing the Documentation enn 28 Chapter 3 Setting Up and Installing the Instrument o 29 Applying POWr eI eenlTPRIOMPer d nee pU beet Meads Ba RR Ur Ed 31 Attaching the Instrument to the Computer 00 6 33 Connecting Directly to the USB Ports ssssss e 33 Connecting to an Expansion Hub sssssssss eee 35 Configuring the Device Driver ssss ne 37 Chapter 4 Wiring SigNalS ooooococcoooncrn ennenen 39 General Wiring Recommendations ssssssssss een 41 Warm Up Me id ir ET Rapeseed Odone Bb red eed tutes 42 Connecting Thermocouple Inputs 6 0 6 eee nee 43 Connecting RID Inputs ccs erected te meh eto ee aet AA 45 4 Wire RTD Connections 00 0 hh he 46 3 Wire RT Di Connections o x sp oe eet ENIMS INT E Ae eI NEA E 46 2 Wire RTD Connections cse Lese De eR ERA RIAM EE 47 Connecting Voltage Inputs ssssseeeeeee enn 49 Contents Connecting Voltage Inputs to Thermocouple Channels ooo o ooo oocccoco oo 49 Connecting Voltage Inputs to RTD Channels 50 Connecting Voltage Inputs to High Voltage Channels 0 000 50 Connecting Current Loop Inputs 0 6 6 6 n 53 Connecting Current Loop Inputs to Thermocouple Channels 53 Connecting Current Loop Inputs to RTD Chammels o ooooooccccccccocoo o 54 Connecting Current Loop Inputs to High Voltage Channels issue 56 Connecting Digi
52. fault or one of the supported sensor types for that channel Note If you wish you can overwrite these channel input types programmatically using your software development environment or application 6 Click OK 7 If you want to rename the instrument click Edit Name enter a new name for the instrument and then click OK The name is used to identify the instrument in all subsequent applications 8 Repeat steps 4 to 7 for the other instrument that you want to configure 9 When you are finished configuring the instrument click Close Continue with the instructions on wiring in Chapter 4 starting on page 39 37 Chapter 3 38 Y Wiring Signals General Wirmg Recommendations nc esee beee re a ce ee EX oed 41 A O RA hodie am nde ebenaage 42 Connecting Thermocouple Inputs ccce e eee be Ee EE Yd 43 Connecting RID A ODE Oe AL E eh Cem Nd Pos a de d 45 Connect Voltage MPU coooosaos cae ie pee EORR ext EN e ERA e RE rh vetns 49 Connecting Current Loop Inputs cic cco eee a ee a ee Ee e Eee rd 53 Conterins Digtal 17 Sigal cio ai ae A ee PT aUud 58 39 Chapter 4 40 di Prepare to Use the Instrument NL see Chapter 2 starting on page 23 Set Up and Install the Instrument see Chapter 3 starting on page 29 Wire Signals this chapter d Verify the Operation of the Instrument C see Chapter 5 starting on page 61 Wiring Signals General Wiring Recommendations Ke
53. 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 Figure 5 on page 34 for the location of this LED Resolution TEMPpoint VOLTpoint and MEASURpoint instruments support a resolution of 24 bits for the analog input subsystem you cannot specify the resolution in software Calibration Each TEMPpoint VOLTpoint and MEASURpoint instrument is factory calibrated to meet or exceed its published specifications using standards traceable to NIST The calibration process includes multiple steps First the A D on each channel is calibrated for offset and gain these values including the zero point are stored in ROM Then each CJC circuit is calibrated for thermocouple input channels and the reference current is characterized for RTD channels While each instrument was designed to preserve high accuracy measurements over time it is recommended that your instrument be recalibrated every year to ensure that it meets or exceeds specifications You can calibrate your instrument in the field using precise calibration equipment and the Measurement Calibration Utility described on page 15 Optionally you can return your instrument to Data Translation for recalibration For information on factory recalibration contact Data Translation at 508 481 3700 ext 1323 if you are in the USA or call your loca
54. g software enable the analog input channels that you want to sample by specifying the channel numbers in the channel 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 VOLT point or MEASURpoint instrument provides as shown in Table 5 Table 5 Supported Channels for Continuous Operations Total Number of Channel for Reading Analog Input Channels the Digital Input Port Oto 7 8 0 to 15 16 0 to 23 24 0 to 31 32 0 to 39 40 0 to 47 48 The channels are read in order from the lowest channel number to the highest channel number in the list of enabled channels this process is known as a scan How Continuous Scan Works When you issue a command to start the scan the instrument simultaneously samples all the analog input channels CJC inputs if applicable and the digital input port and converts the analog inputs to temperature resistance or voltage based on the sensor type If the channel is enabled the sampled data is placed in the FIFO on the instrument Principles of Operation The FIFO on the instrument is used as a circular buffer Acquisition continues indefinitely until you stop the operation When the FIFO is full the operation wraps to the beginning of the FIFO values are overwritten starting at the first l
55. gulatory Gpecitcatlans Lesen eb bbee e ep Een Ea etes 119 Cannector Specie DOS ee te re er e e eet ORE RENI Ry v e Roe 85 120 Note All analog input specifications are based on the Moving Average filter type see page 93 for more information on filter types 105 Appendix A Basic Instrument Specifications Table 7 lists the basic instrument specifications for TEMPpoint VOLTpoint and MEASURpoint instruments 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 24 bit Sigma Delta 106 Specifications Thermocouple Specifications Table 8 lists the thermocouple specifications for thermocouple channels on the TEMPpoint and MEASURpoint instruments Table 8 Thermocouple Specifications Feature Specifications Thermocouple types software selectable B E J K N R S T A D resolution 24 bits Sample rate 10 Samples s Thermal disturbance channel to channel None Upscale break detection current DT9871U and DT9874 10 nA DT9871 100 nA System temperature error DT9871U and DT9874 See Table 9 on page 108 DT9871 See Table 10 on page 109 a Older versions of the DT9871 instrument may support a maximum sampling rate of 7 5 Samples s 107 Appendix A System Temperature Error for the DT9871U and DT9874 Table 9
56. ial inputs floating channels and a simultaneous architecture ISO Channel technology provides channel to channel isolation not just isolation from the analog front end to the computer ground With this kind of isolation the channels are individually isolated from each other and from other system components Typically instrument manufacturers have used relays isolation amplifiers or optical isolation to provide channel to channel isolation These methods have the following advantages and limitations Relays This technology provides good galvanic separation and can provide good accuracy and thermal properties but relays are slow as they operate on one channel at a time 10 cycles s wear out over time and are sensitive to magnetic fields If one relay sticks staying closed the entire system fails e Isolation amplifiers Isolation amplifiers are used in multiplexed architectures While they are solid state they are expensive not as accurate require more power and generate more noise and heat than other solutions e Optical isolation Optical isolation is good in digital isolation systems but causes accuracy problems in analog isolation systems It is also subject to long term drift and requires considerably more power With ISO Channel technology the A D is on the sensor side and has its own custom DC DC converter Then optical or transformer isolation is used to transfer the A D output data the sensor data digitally An
57. ibes how to wire signals to the instrument Chapter 5 Verifying the Operation of Your Instrument describes how to verify the operation of the instrument using the Measurement Application Chapter 6 Principles of Operation describes the analog input and digital I O features of the TEMPpoint VOLT point and MEASURpoint instruments in detail Chapter 7 Troubleshooting provides information that you can use to resolve problems with your instrument should they occur Appendix A Specifications lists the specifications of the TEMPpoint VOLTpoint and MEASURpoint instruments Appendix B Connector Pin Assignments describes the pin assignments of the digital I O connector on the TEMPpoint VOLTpoint and MEASURpoint instruments Appendix C About ISO Channel Technology describes the benefits of ISO Channel technology An index completes this manual Conventions Used in this Manual The following conventions are used in this manual Notes provide useful information or information that requires special emphasis cautions provide information to help you avoid losing data or damaging your equipment and warnings provide information to help you avoid catastrophic damage to yourself or your equipment tems that you select or type are shown in bold Related Information 10 Refer to the following documents for more information on using a TEMPpoint VOLTpoint or MEASURpoint instrument
58. ide the USA call your local distributor for authorization and shipping instructions see our web site www datatranslation com for the name and telephone number of your nearest distributor All return shipments to Data Translation must be marked with the correct RMA number to ensure proper processing 2 Using the original packing materials if available package the instrument as follows Wrap the instrument in an electrically conductive plastic material Handle with ground protection A static discharge can destroy components on the instrument Place in a secure shipping container 3 Return the instrument to the following address making sure the RMA number is visible on the outside of the box Customer Service Dept Data Translation Inc 100 Locke Drive Marlboro MA 01752 1192 103 Chapter 7 104 m Specifications Basie Instrument Dpecifi Cabos secedere eee ee eee n enden Rer e e eere oe 106 Thermocouple Species tong eck eese Hh ae aca et ae eee 107 NBA go CE 11 Isolation and Protection Specifications cooscccasc e eere ES 112 hendre der uie A 113 Temperature Stability Specifications ccc nc oes eee ere x Rep ee hen 114 Voltage Measurement Specifications iiiiisse een eoe re e eee 115 a IA ATHY bE LE RES DRA dhe er ela deett 117 Digital LC Specifialons ose epa trei re RE SIR REX XI ERU ES e dare 117 Power Physical and Environmental Specificati0NS o o oooooocommmmmmm 9oo 118 Re
59. in 4 of the screw terminal block Connecting Voltage Inputs to High Voltage Channels Each DT9873 and DT9874 contains pluggable screw terminals for connecting high voltage inputs Note On the standard DT9874 instrument channels 32 to 47 correspond to the high voltage input channels Figure 14 shows the numbering of the screw terminal blocks for high voltage connections 50 Wiring Signals DD XD X5 4 3 2 1 Shield Sense No Sense Connect Figure 14 Screw Terminal Block Numbering for High Voltage Connections Note To make wiring easier use the supplied screwdriver to attach your signals to the screw terminal block When you are finished plug the screw terminal block into the screw terminal header that corresponds to the channel to which you are wiring Figure 15 shows how to connect high voltage inputs to the DT9873 and DT9874 High Voltage Channel Sense Sense N NM 2 mi E Shield Vin Vin Pin 2 is no connect Figure 15 Connecting Voltage Inputs 51 Chapter 4 The input impedance is well over 100 MQ 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 52 Wiring Signals Connecting Current Loop Inputs In some applications such as solar cell fuel cell
60. input range Sample rate 10 Samples s Gain 1 Input impedance DT9871U and DT9874 thermocouple channels 5 MQ typical DT9871 5 MQ typical DT9872 and DT9874 RTD channels gt 100 MQ DT9873 and DT9874 high voltage channels gt 1 MQ Power ON or OFF Input common mode voltage 500 V Common mode rejection 60 Hz and 50 Hz gt 150 dB Coupling DC System linearity DT9871U and DT9874 thermocouple channels 0 005 DT9871 0 005 DT9872 and DT9874 RTD channels 0 001 DT9873 and DT9874 high voltage channels 0 001 System gain error includes all noise sources gain 1 DT9871U and DT9874 thermocouple channels 0 00075 of full scale range DT9871 0 00075 of full scale range DT9872 and DT9874 RTD channels 0 00075 of full scale range DT9873 and DT9874 high voltage channels 0 01 of reading System zero error includes all noise sources gain 1 no filter DT9871U and DT9874 thermocouple channels 0 25 uV RMS DT9871 5 uV RMS DT9872 and DT9874 RTD channels 12 UV DT9873 and DT9874 high voltage channels 300 uV for the 10 V input range 2 mV for the 100 V input range 8 mV for the 400 V input range 115 Appendix A 116 Table 17 Voltage Measurement Specifications cont Feature Specifications System drift error zero DT9871U and DT9874 thermocouple channels DT9871 DT9872 and DT9874 RTD channels DT9873 and DT9874 high voltage channels 0 02 uV C
61. isplay temperature data C Celsius F Fahrenheit or K Kelvin 4 Under Sensor Type select the input type for each of the channels For channels that support programmable voltage ranges the following drop down box is displayed select the voltage range that you want to uses for the channel Sensor Type 0 I 10 Volts v 10 Volts 100 Volts 400 Volts 67 Chapter 5 68 10 11 12 13 Note If you want to set all the channels to the same configuration at once select the configuration to apply using the Set all to combo box If you select a voltage sensor type for a channel the data is displayed in voltage The sensor type setting is ignored for the digital input port Under Filter Type select Moving Average if you want to filter the data or Raw if you do not want to filter the data Under Log Channels to Disk check the channels that you want to log to disk when you use the Chart Recorder described on page 71 The first time you use the Measurement Application all channels are selected for data logging Under External Trigger Enable select True if you want to start acquisition using an external trigger signal connected to digital input line 0 otherwise select False Under Channel Names specify a meaningful name to represent each channel Under Acquisition Frequency click the frequency 10 Hz 5 Hz 2 Hz Every 2 s Every 5 s Every 10 s Every Minute Eve
62. l distributor if you are located outside the USA see our web site www datatranslation com for the name and telephone number of your nearest distributor 90 Principles of Operation In addition each instrument auto calibrates on each power up cycle to guarantee high accuracy measurements This process also known as auto zeroing resets the zero point of each A D You can also auto calibrate the instrument at any time as long as acquisition is not in progress using a software command Refer to your software documentation for more information on the auto calibration feature Sample Clock Source TEMPpoint VOLTpoint and MEASURpoint instruments support an internal clock with a maximum sampling rate of 10 Samples s Use software to specify an internal clock source and a clock frequency between 0 000152590219 Hz and 10 0 Hz Note The clock frequency that you specify is rounded to the closest correct value that the instrument can accept without error Internally the 10 Hz clock is divided by an integer in the range of 1 to 65535 the internal clock divider to determine the closest value 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 channel list are read simultaneously at the specified clock frequency Trigger Source A trigger is an event that occurs based on a specified set of conditions Acqui
63. listed on our web site www datatranslation com 11 About this Manual 12 Overview Hardware Features cee cade aden A is 14 APPO DOWA vee neces reseed a a sa 18 JAUDISDIBS nidad a AA A a a ir 19 20 Getting Started Procedure 13 Chapter 1 14 Hardware Features Data Translation provides a number of USB instruments to meet your measurement needs including the following e TEMPpoint a family of temperature measurement instruments e VOLTpoint a family of voltage measurement instruments e MEASURpoint a family of mixed temperature and voltage measurement instruments All of these instruments support Version 2 0 and 1 1 of the USB bus The following sections summarize the features of the TEMPpoint VOLTpoint and MEASURpoint USB instruments TEMPpoint Features TEMPpoint instruments include the following models DT9871U DT9871 and DT9872 The key features of TEMPpoint instruments are as follows e DT9871U and DT9871 Configurable analog input channels for thermocouple or differential voltage inputs easy access jacks for each channel for quick wiring One CJC cold junction compensation input for each thermocouple channel B E J K N R S and T thermocouple types supported the instrument automatically linearizes the measurements and returns the data as a 32 bit floating point temperature values Input range of 0 075 V for the DT9871U with 0 25 uV RMS A D noise using no software
64. lists the accuracy of the DT9871U and DT9874 for each thermocouple type at several temperature points over the dynamic range of the instrument Table 9 Calculated Thermocouple Accuracy of the DT9871U and DT9874 Thermocouple Type Input Temp J K T E S R B N 100 C 30 17 C 30 17 C 30 16 C 30 16 C 40 16 C 0 C 40 15 C 30 16 C 40 16 C 30 15 C 30 22C 30 220 0 16 C 100 C 0 18 C 30 15 C 40 16 C 30 15 C 40 18 C 0 18 C 40 15 C 300 C 30 15 C 30 17 C 410 16 C 30 15 C 40 18 C 40 18 C 30 23 C 40 15 C 500 C 30 15 C 30 15 C 40 15 C 410 18 C 30 17 C 30 21 C 40 15 C 700 C 40 15 C 40 15 C 40 16 C 40 18 C 30 18 C 30 17 C 40 16 C 900 C 30 15 C 30 17 C 30 17 C 30 18 C 30 18 C 30 19 C 30 16 C 1100 C 40 15 C 40 16 C 40 19 C 30 18 C 30 18 C 30 16 C 1400 C 40 18 C 30 18 C 30 17 C a Conditions for accuracy measurements Warm up time of 45 minutes Inclusive of typical 0 15 C CJC error maximum CJC error is 0 25 C Inclusive of typical 0 25 uV offset error maximum offset error is 2 5 uV Exclusive of thermocouple errors Exclusive of noise see
65. nals Connecting Voltage Inputs The way you connect voltage inputs depends on the channel type you are using This section describes how to connect voltage inputs to thermocouple input channels RTD input channels and high voltage input channels Connecting Voltage Inputs to Thermocouple Channels Figure 12 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 Thermocouple Channel Omega Cu Cu Plug SMPW U M Voltage Input Analog Input 0 Analog Input 0 Return JK Signal Source Figure 12 Connecting Voltage Inputs to a Thermocouple Channel 49 Chapter 4 Connecting Voltage Inputs to RTD Channels Figure 13 shows how to connect a voltage input to an RTD channel on a DT9872 or DT9874 instrument Note On the standard DT9874 instrument channels 16 to 31 correspond to the RTD input channels RTD Channel Sense Sense N NM me H i aa E Shield Vin Vin Figure 13 Connecting Voltage Inputs to an RTD Channel The input impedance is well over 100 MQ 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 p
66. ned on 1 when any of the alarm limits are exceeded on the channels that were assigned to that digital output line If alarm limits are not exceeded the digital output line is turned off 0 6 To see the state of the digital output lines click the OUT button from main window or from the Windows menu select Digital Output Panel A screen similar to the following appears Digital Output Monitor Verifying the Operation of Your Instrument Logging Data to Disk To log data to disk perform the following steps 1 Ensure that you configured the channels that you want to log to disk see page 68 2 Start acquisition by clicking the Start Stop button from the main window or from the Acquisition menu by selecting Start Acquisition 3 Click the Chart Recorder button on the main window or from the Windows menu select Chart Recorder A screen similar to the following appears a Measurement Chart Recorder E elk Time Axis Length 10 Seconds 10 Seconds Channel Visibility mo M1 n2 n3 Y All Visible All Invisible f Single Band Multiple Bands X3 ob 3 00 00 00 00 01 00 00 02 00 00 03 00 00 04 00 00 05 00 00 06 00 00 07 00 00 08 00 00 09 00 00 Open Last Recording in Excel X t s Start Recording 4 Under Channel Visibility select the channels that you want to be visible on the display Note The first time that you run the Measurement Application all the channels ar
67. ng the Instrument to the STP37 Figure 20 shows the layout of the STP37 screw terminal panel and lists the assignments of each screw terminal 58 Wiring Signals E Digital Input 1 2 TB1 36 Digital Output 7 Digital Input 1 21 17 Digital Output 7 Digital Input 2 3 1 20 18 19 37 35 Digital Output 6 Digital Input 2 22 Tpo d 7 37 TB3 16 Digital Output 6 Digital Input 3 4 557507575 34 Digital Output 5 3a2a 0 0 0 Digital Input 3 23 E E 15 Digital Output 5 Digital Input 4 5 ss 8 8 33 Digital Output 4 Digital Input 4 24 25538 14 Digital Output 4 Digital Input 5 6 32 Digital Output 3 Digital Input 5 25 13 Digital Output 3 Digital Input 6 7 31 Digital Output 2 Digital Input 6 26 TB4 TBS 12 Digital Output 2 Digital Input 7 8 30 Digital Output 1 Digital Input 7 27 11 Digital Output 1 Not Connected 9 29 Digital Output 0 Not Connected 28 10 Digital Output 0 Figure 20 STP37 Screw Terminal Panel Connecting Digital Input Signals Figure 21 shows how to connect digital input signals lines 0 and 1 in this case to the digital I O connector on the TEMPpoint VOLTpoint or MEASURpoint instrument A 5 V Instrument Digital I O Connector 1k0 pint pins rw lt TTL Outputs i J pin2 D DIN 14 D zd DIN 0 pin 20 B pin21 P DIN 1 1 kQ pull up to 5 V required for TTL outputs
68. ng web site http www omega com thermocouples html 43 Chapter 4 Figure 7 shows how to connect a thermocouple input to a thermocouple channel Thermocouple Channel Nu Omega Cu Cu Plug SMPW U M ea o e J Thermocouple Input l V Figure 7 Connecting Thermocouple Inputs Wiring Signals Connecting RTD Inputs Each DT9872 and DT9874 contains pluggable screw terminals for connecting RTD inputs Note On the standard DT9874 instrument channels 16 to 31 correspond to the RTD input channels Internally these signals are connected in differential mode Figure 8 shows the numbering of the screw terminal blocks for RTD connections vo o 00 EEE 4 3 2 1 Return Sense Sense Current Figure 8 Screw Terminal Block Numbering for RTD Connections Note To make wiring easier use the supplied screwdriver to attach your signals to the screw terminal blocks When you are finished plug the screw terminal block into the screw terminal header that corresponds to the channel to which you are wiring The DT9872 supplies each RTD channel with 425 uA 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 DT9872 reads this vol
69. nt instruments DT9873 and DT8873 for VOLTpoint instruments and DT987x and DT887x for MEASURpoint instruments 6 Optional If you previously used the Measurement Application and you want to overwrite the configuration of the last session which was automatically saved with the default configuration for the selected instrument click the Reset to Default Config button 7 Optional If you previously used the Measurement Application and you want to overwrite the names of the channels which were automatically saved with the default channel names for the selected instrument click the Reset Channel Names button Note that this step is useful especially when changing between instrument types 65 Chapter 5 8 Click Continue The latest state is saved and used when the application is next run and the Channel Overview screen of the Measurement Application is displayed Note that data acquisition is started automatically and temperature values are displayed in degrees C by default EA Measurement Channel Overview E Ch40 Ch42 Ch45 Volts 7 70 V 8 10 V 8 30 V A 7 60 V 7 60 V 8 10 V Ch32 Ch33 Chad cha Ch38 Ch38 7 50 V 7 60 V 8 40 V 8 40 V 7 90 V 8 10 V Ch24 Ch25 Ch26 Ch23 Ch30 Chat 48 00 C 50 03 C 52 02 C 58 01 C 60 03 C 62 02 C Chi Chi Chig Ch21 Ch22 Ch23 32 03 C 34 00 C 36 01 C 42 02 C 44 03 C 46 00 C Cha Cha Chio Chi3 Chi4 Chi5 16 01 C 18 02 C 20 02 C 26 03 C 28 00 C 30 02 C Cho Ch2 Ch5 Ch6 Ch 0 02 C 2 02 C 4 01 C Y 10 03
70. nual describes the features and capabilities of your instrument using the IVI COM instrument driver software Troubleshooting information is also provided Note If you are programming the instrument using the IVI COM driver refer to the DtxMeasurement IVI COM driver online help for more information If you are using Measure Foundry to program your instrument refer to the Measure Foundry User s Manual and online help for more information Intended Audience This document is intended for engineers scientists technicians or others responsible for using and or programming a TEMPpoint VOLTpoint or MEASURpoint instrument in the Microsoft Windows XP Windows Vista or Windows 7 operating system It is assumed that you have some familiarity with thermocouples RTDs and or voltages and that you understand your application How this Manual is Organized This manual is organized as follows Chapter 1 Overview summarizes the major features of the TEMPpoint VOLTpoint and MEASURpoint instruments as well as the supported software and accessories Chapter 2 Preparing to Use the Instrument describes how to unpack the instrument check the system requirements install the software and view the documentation online About this Manual Chapter 3 Setting Up and Installing the Instrument describes how to apply power to the instrument and connect the instrument to the network Chapter 4 Wiring Signals descr
71. o isolated digital output lines the outputs are solid state relays that operate from 30 V at currents up to 400 mA peak AC or DC VOLT point Features The key features of VOLTpoint DT9873 instruments are as follows Direct connection of analog input channels for differential voltage inputs removable screw terminal blocks for each channel for quick wiring One 24 bit Delta Sigma A D converter per channel for simultaneous high resolution measurements 500 V galvanic isolation channel to channel and to the host computer to protect signal integrity Software selectable input range of 10 V 100 V or 400 V per channel Throughput rate of up to 10 Samples s for all channels Software or external digital trigger on digital input line 0 starts acquisition Auto calibrating front end resets the zero point on each power up in addition the instrument supports anytime calibration performing an auto calibration function on software command Measurement Calibration Utility allows you to calibrate the instrument in the field see page 18 for more information on this utility 8 opto isolated digital input lines you can read the digital input port through the analog input data stream for correlating analog and digital measurements 8 opto isolated digital output lines the outputs are solid state relays that operate from 30 V at currents up to 400 mA peak AC or DC 15 Chapter 1 MEASURpoint Features The standard MEASURpoint DT9
72. ocation in the FIFO It is up to your application to retrieve the data from the FIFO refer to your software documentation for more information The conversion rate is determined by the frequency of the input sample clock refer to page 91 for more information about the input sample clock The sample rate which is the rate at which a single entry in the channel list is sampled is the same as the conversion rate due to the simultaneous nature of the MEASURpoint instrument Figure 29 illustrates scanning a list of three enabled channels channel 0 channel 1 and channel 2 In this example analog input data is acquired simultaneously on each clock pulse of the input sample clock Data is acquired continuously Chan 2 Chan 2 Chan 2 Chan 2 Chan 1 Chan 1 Chan 1 Chan 1 Chan 0 Chan 0 Chan 0 Chan 0 EE l Input O gt Sample Clock Data is acquired continuously Operation starts Figure 29 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 and that removes aliasing a condition where high frequency input components erroneously appear as lower frequencies after sampling In addition to the filter provided in hardware
73. oduced unless the voltage drop is essentially equal and opposite to the voltage drop across Sense Figure 10 shows a 3 wire RTD connection 46 Wiring Signals RTD Channel Return 425 UA Current Sense Sense Y H HoE M 4 RL i i RL Es RTD R is lead wire resistance Figure 10 3 Wire RTD Connection 2 Wire RTD Connections The 2 wire configuration is the least accurate of the RTD wiring configurations because the lead wire resistance Ry and its variation with temperature contribute significant measurement errors particularly if the lead wire is long If you decide to use the 2 wire connection scheme ensure that you use short lead wire connections For example if the lead resistance is 0 5 2in each wire the lead resistance adds a 1 Qof error to the resistance measurement Using a 100 ORTD Pt100 with a 0 00385 C European curve coefficient the resistance represents an initial error of 1 Q 0 385Q C or 2 6 C Since the lead wire resistance changes with ambient temperature additional errors are also introduced in the measurement Figure 11 shows a 2 wire RID connection 47 Chapter 4 48 Return ES RTD Channel Sense Sense Y 425 uA Current 9 me mi 2E Ri tf T Es RTD ER Figure 11 2 Wire RTD Connection Wiring Sig
74. of less than 0 01 A on a 100 A range Typical Shunts e Vishay WSMS5515 2 mQ 2W 100A 20mV e Vishay CSM2512S 10 mQ 1W 10A 100mV e Deltec MUB 500 50 1 mQ 25W 500A 50mV Notes The resolution is 2 mV on a 100 V range and 0 3 mV on the 10 V range Since the resolution of the 400 V range is 8 mV using current loop inputs with this range is impractical in most applications On the standard DT9874 instrument channels 32 to 47 correspond to the high voltage input channels Figure 18 shows an example of wiring signals to measure 20 mA using the 10 V input range 56 Wiring Signals High Voltage Channel Sense Sense m4 m3m2 M n AM gt Shield 20 mA Load 250 Q shunt resistor 28 V can be up to 500 V In this example the input range is 10 V Figure 18 Connecting a Current Loop Input to a High Voltage Channel to Measure 20 mA 57 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 19 Instrument Back Panel EP333 Cable Assembly Digital 1 O Connector STP37 Figure 19 Connecti
75. ol Panel System Hardware Device Manager uninstall any unknown devices showing a yellow question mark Then run the setup program on your Instrument OMNI CD to 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 102 Intermittent operation Loose connections or vibrations exist Check your wiring and tighten any loose connections or cushion vibration sources see the instructions in Chapter 4 The instrument is overheating Check environmental and ambient temperature consult the specifications on page 118 of this manual and the documentation provided by your computer manufacturer for more information Electrical noise exists Check your wiring and either provide better shielding or reroute unshielded wiring see the instructions in Chapter 4 Troubleshooting Table 6 Troubleshooting Problems cont Symptom Possible Cause Possible Solution Device failure error reported The instrument cannot communicate with the Microsoft bus driver or a problem with the bus driver exists Check your cabling and wiring and tighten any loose connections see the instructions in Chapter 4
76. on Setalarm limits for each channel Update the value of the digital output lines based on alarm conditions Usea chart recorder to display data over time and log it to an hpf file for later analysis Open the last recorded hpf data file in Microsoft Excel View any hpf data file in a file viewer You can customize this application to suit your needs using Measure Foundry Professional with the Instrument Pak the source code for this application is included with instrument Measure Foundry An evaluation version of this software is available for developing applications for TEMPpoint VOLTpoint or MEASURpoint instruments Measure Foundry is a rapid application development package that provides a system solution for all types of measurement instruments Using Measure Foundry you can develop complex test and measurement applications easily without writing code Simply drag and drop components on a form and configure their property pages to access all elements of your system Order the Instrument Pak for Measure Foundry SP1309 CD to build your own application for your instrument DtxMeasurement IVI COM driver This driver provides access to the instrument s functions through a COM server The IVI COM driver works in any development environment that supports COM programming including Measure Foundry MATLAB Visual Basic NET Visual C NET Agilent VEE Pro LabVIEW LabWindows and others Measurement Calibration Utilit
77. on If you wish to install the evaluation version of Measure Foundry click Measure Foundry Evaluation from the MEASURpoint Installation web site and follow the prompts to install the software and related documentation Note To use Measure Foundry with TEMPpoint VOLTpoint or MEASURpoint instruments select the evaluation version of Measure Foundry Pro Instruments Pak 5 If you are installing from the Instrument OMNI CD perform these steps a b c Click Install Measurement Software Ensure that Measurement Software amp Application is selected If you wish to install the evaluation version of Measure Foundry in addition to the Measurement application also select Measure Foundry EVAL Note To use Measure Foundry with TEMPpoint VOLTpoint or MEASURpoint instruments select the evaluation version of Measure Foundry Pro Instruments Pak Click Install Selected Features and follow the prompts to install the software When you are finished with the Instrument OMNI CD click Quit Installer For information on using the Measurement Application to verify the operation of your instrument refer to Chapter 5 starting on page 61 27 Chapter 2 28 Viewing the Documentation Note To view the documentation you must have Adobe Reader 5 0 or greater installed on your system Adobe Reader is provided on the Instrument OMNI CD If you install Adobe Reader from this CD make sure that you open Adobe Reader and
78. on B E J K N R S and or T By default these channels are configured for voltage inputs You can specify the thermocouple types for channels using the DT Open Layers Control Panel applet described on page 37 the Change Configuration dialog in the supplied Measurement Application described on page 67 or by using an API call in your application program Note In a mix and match system it is easy to accidentally mismatch the software and hardware configuration for a channel Therefore it is recommended that you pay particular attention when configuring channels since the resultant errors may be not large enough to notice initially but may 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 92 for more information on specifying the channels for a scan Table 3 lists the supported measurement range for each thermocouple type Refer to page 88 for information on the supported input range for voltage measurements Principles of Operation Table 3 Supported Measurement Range for Each Thermocouple Type Supported Measurement Range Thermocouple Type Minimum Maximum B 0 C 32 F 1820 C 3308 F E 200 C 328 F 1000 C 1832 F J 210 C 346 F 1200 C 2192 F K 200 C 328 F 1370 C 2498 F N 200 C 328 F 1300 C 2372 F R 50
79. or Thermocouple Channels Each thermocouple 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 thermocouple type the channel may be configured for the wrong type of thermocouple or something other than a thermocouple may be connected to the channel For channels configured with a thermocouple type of None voltage the Limit LMT LED on the rear panel of the instrument lights to alert you when the voltage is out of range see Figure 5 on page 34 for the location of this LED For channels configured with a thermocouple type other than None voltage the LMT LED lights when the temperature limit is out of range for the specified thermocouple type In addition if the input voltage is less than the legal voltage range for the selected thermocouple type the software returns the value TEMP OUT OF RANGE LOW 88888 decimal If the input voltage is greater than the legal voltage 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 value rises very quickly and you will receive the TEMP OUT OF RANGE HIGH 88888
80. or 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 RID 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 95 is returned One floating point value is returned for each enabled channel including the digital input port Data Format for High Voltage Channels For high voltage channels a voltage value in the range of 10 V 100 V or 400 V is returned for each channel depending on how the channel was configured One floating point value is returned for each enabled channel including the digital input port Error Conditions TEMPpoint VOLTpoint and MEASURpoint instruments report overrun errors by sending an overrun event to the application program If this error condition occurs the instrument stops acquiring and transferring data to the host computer To avoid this error try one or more of the following Reduce the sample rate Close any other applications that are running Runthe program on a faster computer 94 Principles of Operation Additionally the following constants may be reported to the host e 99999 0 SENSOR IS OPEN described on page 87 e 88888 0 TEMP OUT OF RANGE HIGH described on page 89 and page 90 e 88888 0 TEMP OUT OF RANGE LOW described on page 89 and page 90 If any of these constants is r
81. ows the digital output circuitry 1 of 8 Solid State Relays Figure 31 Digital Output Circuitry Digital outputs resemble a switch the switch is closed if the state of the digital output line is 1 and the switch is open if the state of the digital output line is 0 On power up or reset the digital outputs are disabled Channel to Channel Isolation Each TEMPpoint VOLTpoint and MEASURpoint instrument includes channel to channel isolation of up to 250 V between digital I O lines If you require greater channel to channel isolation use every other digital line This reduces the number of digital I O lines but provides channel to channel isolation of 500 V one channel can be 250 V while the adjacent channel can be 250 V 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 You cannot configure port resolution through software Operation Modes Using software you can read from a single digital input line or the entire digital input port or write to a single digital output line or the entire digital output port You can also return the value of the entire digital input port in the analog input data stream if you want to correlate analog input data with digital events refer to
82. p and Installing the Instrument IA o A A E E A N 21 Attaching the Instrument to the Computer oieri erid eaka a e E a o 33 Congue the Derice DIBDVer ioco eds eem tree etre a t rte e certet inca 37 Chapter 3 Prepare to Use the Instrument see Chapter 2 starting on page 23 Set Up and Install the Instrument this chapter Wire Signals see Chapter 4 starting on page 39 Verify the Operation of the Instrument see Chapter 5 starting on page 61 Note Your TEMPpoint VOLTpoint and MEASURpoint instruments are factory calibrated Thereafter yearly recalibration is recommended Refer to page 90 for more information on calibration 30 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 Refer to Figure 2 Instrument Rear Panel Power Digital 1 0 USB Switch 5 V In v_ O EP361 5 V Power Supply Pd To wall outlet Figure 2 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
83. put current Low input current DC 3 to 28 V lt 1 5V 2 2 kQ resistor to 1 2 V 2 2 kQ resistor to 1 2 V Termination Series 2 2 kQ Outputs Output type Solid state relay Output driver CMOS High output 30V Low output 0 4 V 400 mA Breakdown voltage 60V Contact impedance 10 Isolation voltage To computer ground 500 V Channel to channel 250 V a Determined by the pin spacing in the 37 pin digital connector For greater channel to channel isolation use every other digital I O line using every other digital I O line allows 500 V isolation channel to channel 117 Appendix A Power Physical and Environmental Specifications Table 19 lists the power physical and environmental specifications for the TEMPpoint VOLTpoint and MEASURpoint instruments Table 19 Power Physical and Environmental Specifications 118 Feature Specifications USB power 5 V Standby 5 V Power On 5 V Enumeration 500 uA maximum 360 uA typical 2 mA maximum 1 mA typical 2 mA maximum 1 mA typical External power requirements 5 V 0 25V O 2 A 0 9 mA typical Physical Dimensions of enclosure 88 14 H x 212 85 mm W x 211 43 mm D Weight 1704 g Environmental Operating temperature range 0 C to 55 C Storage temperature range Relative humidity Altitude 25 C to 85 C to 95 noncondensing up to 10 000 feet Specifications Reg
84. repare to Use the Instrument see Chapter 2 starting on page 23 Set Up and Install the Instrument see Chapter 3 starting on page 29 Wire Signals see Chapter 4 starting on page 39 Verify the Operation of the Instrument this chapter 62 Verifying the Operation of Your Instrument Overview You can verify the operation of your TEMPpoint VOLTpoint or MEASURpoint instrument using the Measurement Application that is provided with the instrument The Measurement Application developed using Measure Foundry lets you perform the following functions Configure your instrument Acquire temperature resistance and or voltage data from up to 48 analog input channels Display temperature resistance and or voltage data during acquisition Use a Chart Recorder to display and log data to an hpf file for later analysis View any hpf file and view the last recorded hpf data file in Microsoft Excel Set minimum and maximum alarm limits for each channel Set the state of the digital output lines based on alarm limits Read the state of the digital input port If desired you can use Measure Foundry to customize this application Refer to page 27 for information on installing the Measurement Application 63 Chapter 5 Running the Measurement Application To run the Measurement Application perform the following steps 1 Click Start gt Programs gt Data Translation Inc gt Measurement
85. rom the application by selecting the File menu and clicking Quit 75 Chapter 5 76 Part 2 Using Your Instrument Block Diagrams Analog Input Peah o casacas naar ri A ci Digital I O Features o iia id Rr A A EEEE E cee ee bead 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 24 shows the block diagram of the DT9871U TEMPpoint instrument 500 V Isolation Barrier 10 nA Break isolated Detection DC DC o Alv 24 Bit Lo ES x20 gt A D o AN CJC Per Rh ai Point 1 of up to 48 Channels Control FPGA Calibration Processor ROM 10f8 Digital Input p 3 Isolators 5 o ce Digital Output Isolators gt Hp Power LED usB2o USB LED L p Limit LED p Open TC LED USB 2 0 4 IDROM Figure 24 Block Diagram of the DT9871U TEMPpoint Instrument 80 Principles of Operation DT9871 Block Diagram Figure 25 shows the block diagram of the DT9871 instrument
86. ry 2 Minutes Every 5 Minutes at which to simultaneously sample all channels When you are finished configuring the Measurement Application click OK To save the configuration settings click the Configuration menu and then click Save Configuration File Enter a name for the configuration file select the directory in which to save the file and then click Save This file has the extension Measurement Note You can save numerous configuration settings if desired To load a previously saved configuration click the Configuration menu and then click Load Configuration File Restart acquisition by clicking Start Acquisition from the Acquisition menu or by clicking Start Stop from the main window Verifying the Operation of Your Instrument Defining Alarm Limits When you start the Measurement Application for the first time the following alarm limits are defined for each channel e Minimum alarm limit 0 Maximum alarm limit 100 If the acquired value for a channel is between the defined minimum and maximum alarm limits the value is within range and is displayed in black If the acquired value for a channel is below the minimum or above the maximum alarm limit the value is out of range and is displayed in red To change the alarm limits do the following 1 From the Windows menu select Limit Definition A screen similar to the following is displayed Limit Definition
87. s the actual signal Of course the common mode potential is simply an error ISO Channel technology provides common mode rejection of 150 dB which contributes an almost imperceptible error 33 5 million to 1 to Vout Compare this to traditional data acquisition measurement instruments which typically provide only 80 dB of common mode rejection and therefore contribute much more error on the order of 1 part per 10 000 Simultaneous Architecture Many measurement instruments on the market today provide multiplexed architectures where one A D is used to measure multiple channels In this kind of architecture if one channel goes down all channels go down ISO Channel technology on the other hand uses a simultaneous architecture where each channel has its own dedicated 24 bit Delta Sigma A D as shown in Figure 40 About ISO Channel Technology Instrumentation oa bik S5 Amplifier AID Ch 0 o st AID os gt gt E gt VA E 5 L4 I o Mux AID a Converter gt e gt gt x S H 5 c a bi Ss AID Ch 47 o 24bit st AID 2 d Sample 2 Select and Hold Data Stream Simultaneous Architecture Conventional Multiplexed Architecture One A D converter per channel Many channels multiplex into one A D converter Figure 40 Simultaneous vs Multiplexed Architectures Channel to Channel Isolation Besides different
88. scribed on page 67 or by using an API call in your application program Notes In a mix and match system it is easy to accidentally mismatch the software and hardware configuration for a channel Therefore it is recommended that you pay particular attention when configuring channels since the resultant errors may be not large enough to notice initially but may 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 92 for more information on specifying the channels for a scan Input Ranges The input voltage range that is supported by your TEMPpoint VOLTpoint or MEASURpoint instrument depends on the specific instrument model that you purchased as shown in Table 4 Principles of Operation Table 4 Supported Input Ranges Instrument Type Models Input Range TEMPpoint DT9871U 0 75 V for all channels DT9871 1 25 V for all channels DT9872 1 25 V for all channels VOLTpoint DT9873 10 V 100 V or 400 V software selectable for each channel MEASURpoint DT9874 16T 16R 16V 0 75 V for channels O to 15 1 25 V for channels 15 to 31 10 V 100 V or 400 V for channels 32 to 47 software selectable for each channel a Older versions of this instrument had fixed input ranges of 10 V 100 V or 400 V depending on the model purchased Out of Range Data f
89. sition starts when the instrument detects the initial trigger event and stops when you stop the operation TEMPpoint VOLTpoint and MEASURpoint instruments support the following trigger sources for starting analog input operations e Software trigger A software trigger event occurs when you start the analog input operation the computer issues a write to the instrument to begin conversions External digital trigger An external digital trigger event occurs when the instrument detects a voltage from 3 V to 28 V DC on digital input line 0 Initially the external signal must be low and then go high for at least 100 ms to be detected as a trigger Once triggered the state of digital input 0 is ignored 91 Chapter 6 92 Conversion Modes TEMPpoint VOLTpoint and MEASURpoint instruments support continuous scan conversion modes for reading input measurements Continuous scan mode takes full advantage of the capabilities of the TEMPpoint VOLTpoint and MEASURpoint instruments Use continuous scan mode if you want to accurately control the period between successive simultaneous conversions of specific channels In addition to the analog input channels this conversion mode allows you to read the digital input port all 8 digital input lines as part of the analog input data stream This feature is particularly useful when you want to correlate the timing of analog and digital events Specifying Analog Input Channels Usin
90. t 43 25 s SES ER eR ae e en D dne 100 Technical Support cec ee a De en aber teet AS 102 If Your Instrument Needs Factory Service uann nasarnar rnnr arnan 103 Appendix A Specifications ooooococonccnran n 105 Basic Instrument Specifications sssss ees 106 Thermocouple Specifications 2 2 6 eee 107 System Temperature Error for the DT9871U and DT9874 0005 108 System Temperature Error for the DT9871 0 00 cece eee eee 109 RED Specifications lt A E SAGES AAA A tem xus 111 Isolation and Protection Specifications 6 6 eee 112 Memory Specifications eee e ee ee dee Miers etch 113 Temperature Stability Specifications 6 0 0 6 eee eens 114 Voltage Measurement Specifications 0 666 es 115 Digital 1 0 Specifications mt o eS BRS Eae 117 Power Physical and Environmental Specifications ooooooocooooocommoccmmo 118 Regulatory DpecificatioNs mmocirssocrricorrar cbe i em d pa A Ra CN s 119 Connector Specifications bae 120 Thermocouple Connectors noy eer ki rr 120 RID COnnectOLrs 2 eee pH RIPE eats bevels ea eee os 120 High Voltage Connectors s matesi a a een 120 Appendix B Connector Pin Assignments 00000 e eee 121 Contents Appendix C About ISO Channel Technology lese 123 ISO Channel Technology ooooooocococcorr I 124 Why ISO Channel Technology is Your Best Return on Investment 125 Understanding Groun
91. t Return On Investment o o 131 Floating Signal Inputs Offer New Application Advantages oooooooorooommmm 123 Appendix C ISO Channel Technology All TEMPpoint VOLTpoint and MEASURpoint products use ISO Channel technology to eliminate common mode noise and ground loop problems This appendix includes two white papers that describe the benefits of using ISO Channel technology 124 About ISO Channel Technology Why ISO Channel Technology is Your Best Return on Investment When connecting signal sources to an instrument it is important to eliminate the sources of error that can contribute to inaccuracies in your measurements In most measurement instruments this burden is on the customer Instruments that use ISO Channel technology however solve this problem for you saving you tremendous setup and debug time and reducing costly grounding problems when connecting signals In today s economy we understand that every equipment decision needs to make good fiscal sense This section describes why instruments with ISO Channel technology offer you the best return on investment Understanding Ground Loops When measuring signals users often assume that the grounds of their signals and their measurement system are at the same potential However these ground potentials can differ by hundreds of millivolts If the difference in ground potential is large enough current flows between the signal
92. tage drop and automatically converts the voltage to the appropriate temperature based on the RTD type The DT9872 and DT9874 support Pt100 100 Q Platinum Pt500 500 Platinum and Pt1000 1000 O Platinum RTD types using Alpha coefficients of 0 00385 and 0 00392 you can mix and match RID types across RTD channels Refer to the following web site for more information on RID types http www omega com To connect an RTD input you can use a 4 wire 3 wire or 2 wire connection scheme described in the following subsections For the best accuracy use 4 wire RTD connections this connection scheme enables Kelvin sensing to minimize errors due to lead wire resistance 45 Chapter 4 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 Ry and thermal heating Wire impedance of up to 100 Qanywhere in the hookup is automatically cancelled as long as the sense wires are connected Figure 9 shows a 4 wire RTD connection RTD Channel Return 425 UA Current ES Sense Sense i N NM H o H i Figure 9 4 Wire RTD Connection 3 Wire RTD Connections The 3 wire configuration eliminates one wire from the 4 wire RTD connection Lead wire resistance Ri errors in the return wire from Sense may be intr
93. tal I O Signals sssssssssse eh 58 Connecting Digital Input Signals oooo ooooomooconcoccano or 59 Connecting Digital Output Signals isses 60 Chapter 5 Verifying the Operation of Your Instrument oo oooo o 61 OVerviewW eus atn ae A ette ee re t e A tet n to pet one eus 63 Running the Measurement Application 0000 e eee eee eee ee 64 Changing the Configuration of Your Instrument 0 0 00000000008 67 Defining Alarm Limits 2 4 3 A A A eee Ad 69 Logging Datato Diskaenoouncociraro rro ien ee ek the Ra panad ninta Ue 7i Viewing a Data Filerna t cor s due a ces idea e Lu EAT CMT 73 Reading Digital Input Values sese ene 74 Exiting from the Measurement Application 0 000000 75 Part 2 Using Your Instrument 000 eee eee 77 Chapter 6 Principles of Operation 00 0c e eee 79 Block Diagrams vis cto eee er rs e Re e beads ee du a E eps 80 DT9871U Block Diagram 0 eee eee eens 80 DT9871 Block Diagram viii AAA ees 81 DT9872 Block Diagram sies aom eomm bete t bee taip e al ee 82 1919873 Block Diagram cer ER Rr E RA RR A 83 DT9874 Block Diagratri eo rt nte e ee Se te Sa eure e eed 84 Analog Input Features i evscs rro ess ae gu dy sire pea as 85 Analog Input Channels ssssssssssees n 85 Thermocouple Input Channels 0 0 0 000 0 e eee eee eee 86 Cold Junction Compensation 6 666 87 Open Thermocouple Det
94. tal Voltage Ch24 Ch25 20 com x SS Channel Typo of selected channels vus Enter an offsetior the selected Project C ProgramData Measure Foundry TemoVMtem Version 01 047 Foffom Work eese Je pem Es lolas Connecting 10V ISO Channels in Series to Create 20V Range Ch24 10V Range Ch25 10V Range Total Voltage Ch24 Ch25 20V Range Start Stop Figure 46 Because each floating signal input is isolated from each other you can use two separate channels normally each configured for 10V to measure a 20V signal Simply sum the result of each channel to get your result Summary When you need the highest accuracy and the most flexibility from your measurement system ensure that floating signal inputs are provided This approach allows noise free measurements in tough industrial settings It also saves countless days of tracking down erroneous readings that inevitably result if these precautions are not taken from the project s beginning 136 A accessories 19 accuracy specifications thermocouple 108 109 alpha curves 111 analog input 85 basic instrument specifications 106 calibration 90 channels 85 CJC circuit 87 conversion modes 92 data format for high voltage channels 94 data format for RTD channels 94 data format for thermocouple channels 94 differential configuration 43 45 error conditions 94 filtering 93 input ranges
95. teps until you have attached the number of expansion hubs up to five and instruments up to four per hub that you require Refer to Figure 6 The operating system automatically detects the instruments as they are installed 35 Chapter 3 5 V Power Supply 5 V Power Supply Ld USB TEMPpoint TEMPpoint Cables VOLTpoint or VOLTpoint or MEASURpoint MEASURpoint Host Computer F USB Cable USB Cable F oO Power Supply Expansion Hubs for Hub P m I ower Supply USB Cables for Hub C Uh a TEMPpoint TEMPpoint VOLTpoint or VOLTpoint or MEASURpoint MEASURpoint 5 V Power Supply 5 V Power Supply Figure 6 Attaching Multiple Instruments Using Expansion Hubs 36 Setting Up and Installing the Instrument Configuring the Device Driver To configure the device driver for a TEMPpoint VOLTpoint or MEASURpoint instrument do the following 1 If you have not already done so power up the host computer and all peripherals 2 From the Windows Start menu select Settings gt Control Panel 3 From the Control Panel double click Open Layers Control Panel The Data Acquisition Control Panel dialog box appears 4 Click the name of the instrument that you want to configure and then click Advanced The Configurable Board Options dialog box appears 5 For each channel set the Channel Configuration as voltage the de
96. ther by the isolation barrier up to 500 V for each channel Now any noise or common mode voltage to that level is eliminated from the system measurement allowing pristine results from each sensor without any interaction from any other sensor 133 Appendix C Signal Input 1 500V Isolation uv Signal Input n Channel Ground for Sic utn Figure 44 An A D per channel and a DC to DC converter for each A D provides channel to channel isolation where each signal can float to its own ground reference Input channel return references are effectively separate instruments when the inputs are isolated This individual isolation now allows the ground reference of each channel to measure at the level of this common mode voltage up to 500 V This capability allows some new application ideas to flourish Measurement of two signals as shown in Figure 45 can now have essentially 3 separate ground references each signal input signal 0 and signal 1 has a separate return reference additionally the PC has a third ground reference This scheme can be extended for many signal inputs such as 48 inputs in a single small measurement box for a total of 49 different ground references 134 About ISO Channel Technology Signal Input 0 gt A 24 Bit 0 gt A D Ground y PC Reference 0 DC DC WV Signal Input 1 PC Ground Oo Bi 24 Bit Eo p A D a
97. tors used on the VOLTpoint and MEASURpoint instruments Table 23 Voltage Connector Specifications Feature Specifications 4 Position screw terminal block header Phoenix Contact 1803293 4 Position screw terminal block plug Phoenix Contact 1803594 120 Connector Pin Assignments 121 Appendix B 122 Table 24 lists the pin assignments for the 37 pin digital I O connector on TEMPpoint VOLTpoint and MEASURpoint instruments Table 24 Digital l O Connector Pin Assignments Pin Description Pin Description 1 Digital Input 0 2 Digital Input 1 20 Digital Input 0 3 Digital Input 2 21 Digital Input 1 4 Digital Input 3 22 Digital Input 2 5 Digital Input 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 O 28 Not Connected 11 Digital Output 1 29 Digital Output O 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 Output 4 16 Digital Output 6 34 Digital Output 5 17 Digital Output 7 35 Digital Output 6 18 Not Connected 36 Digital Output 7 19 Not Connected 37 Not Connected A About ISO Channel Technology ISO Channel Technology Why ISO Channel Technology is Your Bes
98. ts Ver 2 0 or Ver 1 1 USB Ver 2 0 is strongly recommended USB Ver 1 1 will severely degrade performance 64 MB or more of RAM 128 MB or more recommended One or more CD ROM drives Super VGA 800 x 600 or higher resolution display monitor Once you have verified that your system meets the system requirements install the software as described in the next section Preparing to Use the Instrument Installing the Software The Measurement Application developed using Measure Foundry provides a quick way to verify that your instrument is working properly To install the Measurement Application and all the components necessary to use the Measurement Application with the instrument including the IVI COM driver perform the following steps 1 Insert the Instrument OMNI CD into your CD ROM or DVD drive The installation program should start automatically and the Instrument OMNI installation program should appear 2 If the installation program does not start automatically double click Setup exe from the CD The installation program appears 3 Click Install from Web recommended to get the latest version of the software from the web or Install from CD to install the software from the CD 4 If you are installing from the web perform these steps a Click Measurement Instrument Software and follow the prompts to install the software including the Measurement Application and IVI COM driver and related documentati
99. ts and RTD channels on the DT9874 MEASURpoint instruments require a warm up time of 1 minute for the analog circuitry to stabilize Wiring Signals Connecting Thermocouple Inputs The DT9871U DT9871 and DT9874 instruments contain Cu Cu thermocouple jacks for connecting thermocouple inputs Note On the standard DT9874 instrument channels 0 to 15 correspond to the thermocouple input channels Internally these signals are connected in differential mode You can mix and match the following thermocouple types across channels B E J K N R S and or T Each Cu Cu thermocouple input jack is polarized and accepts a mating Cu Cu plug in the appropriate orientation Table 1 lists the color designations for the and polarities of the supported thermocouple types for both the ANSI American and IEC International standards Table 1 Thermocouple Color Designation Standards Thermocouple Thermocouple Wire Color Coding Wire Color Coding Standard Type Polarity Polarity ANSI Type J White Red Type K Yellow Red Type T Blue Red Type E Violet Red Type S Black Red Type R Black Red Type B Gray Red Type N Orange Red IEC Type J Black White Type K Green White Type T Brown White Type E Violet White Type S Orange White Type R Orange White Type B Gray White Type N Pink White For more information on thermocouple standards refer to the followi
100. typical 0 02 uV C typical 0 10 uV C 0 5 uV C for the 10 V input range 5 uV C for the 100 V input range 20 uV C for the 400 V input range System drift error gain DT9871U and DT9874 thermocouple channels DT9871 DT9872 and DT9874 RTD channels DT9873 and DT9874 high voltage channels 4 ppm C 4 ppm C 10 ppm C 15 ppm C A D reference Drift Drift per year x8 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 high voltage channels 100 ppm year typical 100 ppm year typical 0 05 C per year 0 C x0 27 C per year full scale temperature 100 ppm year typical Warm up time for the DT9873 and DT9874 high voltage channels 1 hour a You configure the input range for each channel using software b Older versions of the instrument may support a maximum sampling rate of 7 5 Samples s Specifications Digital I O Specifications Table 18 lists the specifications for the digital input DIN and digital output DOUT subsystems on the TEMPpoint VOLTpoint and MEASURpoint instruments Table 18 Digital I O Specifications Feature Specifications Number of digital I O lines 16 8 In 8 Out Number of ports 2 8 bit 1 In 1 Out Inputs Input type High input voltage Low input voltage High in
101. ulatory Specifications Table 20 lists the regulatory specifications for the TEMPpoint VOLTpoint and MEASURpoint instruments Table 20 Regulatory Specifications Feature Specifications Emissions EMI FCC Part 15 EN55022 1994 A1 1995 A2 1997 VCCI AS NZS 3548 Class A Immunity EN61000 6 1 2001 RoHS EU Directive 2002 95 EG Aerospace Material Specification Compliant as of July 1st 2006 Compliant with AMS2750D 119 Appendix A Connector Specifications This section lists the specifications for the following connector types e Thermocouple connectors RTD connectors High Voltage connectors Thermocouple Connectors Table 21 lists the specifications for the thermocouple connectors used on the TEMPpoint and MEASURpoint instruments Table 21 Thermocouple Connector Specifications Feature Specifications Thermocouple jacks Cu Cu Omega plugs White SMPW U M Thermocouple connector Omega partit PCC SMP U 100 R CE ROHS RTD Connectors Table 22 lists the specifications for the RTD connectors used on the TEMPpoint and MEASURpoint instruments Table 22 RTD Connector Specifications Feature Specifications 4 Position screw terminal block header Phoenix Contact 1803293 4 Position screw terminal block plug Phoenix Contact 1803594 High Voltage Connectors Table 23 lists the specifications for the high voltage connec
102. ure Specifications System temperature error Pt100 0 07 C 0 005 of reading Pt500 0 01 C 0 005 of reading Pt1000 20 007 C 0 00526 of reading Temperature resolution 20 0003 C based on a European PT1000 RTD Warm up time 1 minute a The system temperature error is based on the auto zero and system noise error 0 07 C fora Pt100 RTD 0 01 C for a Pt500 RTD or 0 007 C for a Pt1000 RTD plus the gain error of the A D and output impedance of the current source over the voltage range 0 005 of the reading For example the maximum error of a Pt100 RTD at 100 C is 0 075 C 20 07 C plus a gain error of 20 005 C 114 Specifications Voltage Measurement Specifications Table 17 lists the voltage measurement specifications for the TEMPpoint VOLTpoint and MEASURpoint instruments Table 17 Voltage Measurement Specifications Feature Specifications Input voltage range no compensation DT9871U and DT9874 thermocouple channels 0 0750 V DT9871 1 2500 V DT9872 and DT9874 RTD channels 1 2500 V DT9873 and DT9874 high voltage channels 10 V 100 V or 400 V A D converter resolution 24 bits Voltage resolution DT9871U and DT9874 thermocouple channels 0 015 uV DT9871 0 3 uV DT9872 and DT9874 RTD channels 0 3 uV DT9873 and DT9874 high voltage channels 1 2 uV for the 10 V input range 12 uV for the 100 V input range 48 uV for the 400 V
103. y Users can calibrate a TEMPpoint VOLTpoint or MEASURpoint instrument in the field using precise calibration equipment and the Measurement Calibration Utility Since each instrument consists of up to 48 individual channels great care must be taken to ensure that proper warm up times are followed and precise calibration equipment is used The calibration utility ships with a comprehensive help file that describes the required equipment and calibration procedure including warm up times for each instrument The calibration utility allows you to revert to the factory calibration for any or all channels or revert back to the last user calibration values if desired In addition this utility generates a report that lists the starting and ending calibration values for each channel allowing traceability Refer to the Data Translation web site ww w datatranslation com for information about selecting the right software package for your needs 18 Overview Accessories The following optional accessories are available for TEMPpoint VOLTpoint or MEASURpoint instruments e STP37 screw terminal panel The STP37 permits easy screw terminal connections for accessing the digital I O signals of a TEMPpoint VOLTpoint or MEASURpoint instrument e EP333 cable The EP333 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 e Rack mount kits
104. you use all three prongs of the cable when connecting it to your wall outlet 3 Press the Power Switch to turn on the instrument The Power LED on the front panel lights to indicate that power is on Figure 3 shows the front panel of the instrument including the location of the Power LED 31 Chapter 3 32 Ch40 Ch41 Ch42 Ch43 Ch44 Ch45 Ch46 Ch47 Ch32 Ch33 Ch34 Ch35 Ch36 Ch37 Ch38 Ch39 Ch24 Ch25 Ch26 Ch27 Ch28 Ch29 Ch30 Ch31 Ch16 Ch17 Ch18 Ch19 Ch20 Ch21 Ch22 Ch23 Ch8 Ch9 Ch10 Ch11 Ch12 Ch13 Chi4 Ch15 cho Chi Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 porer Q que AUD RANSATN Power LED LAN LED not used on this instrument Figure 3 Front Panel of the Instrument Setting Up and Installing the Instrument Attaching the Instrument to the Computer This section describes how to attach a TEMPpoint VOLTpoint or MEASURpoint instrument to the host computer Notes Most computers have several USB ports that allow direct connection to USB devices If your application requires more TEMPpoint VOLTpoint or MEASURpoint instruments than you have USB ports for you can expand the number of USB devices attached to a single USB port by using expansion hubs For more information refer to page 35 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
105. you can further reduce noise by selecting one of the following filter options in software Moving Average or Raw Refer to page 67 and to your software documentation for more information on selecting a filter type Data Format TEMPpoint VOLTpoint and MEASURpoint instruments return data as 32 bit floating point values How the data is returned depends on the channel type as described in the following subsections 93 Chapter 6 Data Format for Thermocouple Channels If you specify a thermocouple type of None for a thermocouple input channel a voltage measurement is selected and the instrument returns a voltage value For the DT9871U and DT9874 instruments the value is in the range of 0 075 V for the DT9872 instrument the value is in the range of 1 25 V For all other thermocouple types a temperature value in degrees C or one of the error constants described on page 95 is returned In normal operation one floating point value is returned for each enabled channel including the digital input port If you enable the capability of returning CJC data in the data stream described on page 87 two floating point values are returned in the data stream for each enabled analog input channel The first value in the pair represents the temperature or voltage of the channel the second value in the pair represents the CJC temperature in degrees C for that channel Data Format for RTD Channels If you specify an RTD type of None f

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