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National Instruments 9211A manual

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Table of contents for the manual

  • Page 1

    USER GUIDE AND SPECIFICA TIONS USB-9211/9211A 4-Channel, 24-Bit Thermocouple Input Devices This user guide describes how to use the National Instruments USB-9211/9211A devices and lists the specifications. Introduction The NI USB-9211/9211A data acquisition d evice pro vides a USB interface for four channels of 24-bit thermoco uple inputs with inte[...]

  • Page 2

    USB-9211/9211A User Guid e and Specifications 2 ni.com Dimensions Figure 2 shows the USB-9211/9211A devi ce dimensions. Figure 2. USB-9211/9211A Series Devices in Inches (Millimeters) Safety Guidelines Operate the USB-9211/9211A only as described in these operating instructions. Note Although the NI 9211 module may have more stringent certification[...]

  • Page 3

    © National Instruments Cor poration 3 USB-9211/9211A User Guide and Specifications Safety Guidelines for Hazardous Vo ltages If hazardous voltages are connected to the module, take the following precautions. A hazardous vo ltage is a voltage greater than 42.4 V pk or 60 VDC to earth ground. Caution Ensure that hazardous v oltage wiring is performe[...]

  • Page 4

    USB-9211/9211A User Guid e and Specifications 4 ni.com Related Documentation If your device uses NI-D A Qmx Base, refer to ni.com to do wnload the software. Installing the USB-9211/9211A Device Installing the Software Before installing the device, you must install the software you plan to use with the device. Refer to the Software section of this m[...]

  • Page 5

    © National Instruments Cor poration 5 USB-9211/9211A User Guide and Specifications 3. Align the I/O module with the carrier, as sho wn in Figure 3. Figure 3. Module Installation 4. Squeeze the latches and insert the NI 9211 module into the carrier . 5. Press firmly on the connector side of the NI 9211 module until the latches lock the module into [...]

  • Page 6

    USB-9211/9211A User Guid e and Specifications 6 ni.com Mounting the USB-9211 /9211A to a Panel Threaded inserts are located in the USB-921 1/9211A for mounting it to a panel. Refer to Figure 5 for dimensions. Figure 5. Module Dimensions Connecting the USB-9211/ 9211A to a Computer Plug one end of the USB cable into th e USB-9211/9211A and the other[...]

  • Page 7

    © National Instruments Cor poration 7 USB-9211/9211A User Guide and Specifications Wiring the USB-9211/9211A The USB-9211/9211 A has a 10-terminal, detachabl e high voltage screw terminal enclosure that provides connections for four therm ocouple input channels. Each channel has a terminal to whi ch you can connect the positive lead of the thermoc[...]

  • Page 8

    USB-9211/9211A User Guid e and Specifications 8 ni.com Refer to T able 3 for the termin al assignments for each channel. Assembling the High V oltage Screw T erminal Backshell The high voltage screw terminal back shell must be instal led when using hazardous voltages (>42.4 V pk , 60 VDC). Refer to Figure 7 while completing the following steps: [...]

  • Page 9

    © National Instruments Cor poration 9 USB-9211/9211A User Guide and Specifications Figure 7. High V oltage Screw T erminal Backsh ell USB-9211/9211A Circuitr y The USB-9211/9211A channels share a common gro und that is isolated from the chassis and the host comput er. Each channel has an impedance between the TC + and COM terminals and between the[...]

  • Page 10

    USB-9211/9211A User Guide and Specifications 10 ni.com Figure 8. Input Cir cuitry for One Channel If thermocouples are connected to the USB-921 1/9211A, the gain and of fset errors resulting from the so ur ce impedance of the thermocouples are negligible for most applications. Othe r voltage sources with a higher source impedance can introduce mo r[...]

  • Page 11

    © National Instruments Corporation 11 USB- 9211/9211A User Gu ide and Specifications Measurement Accuracy fo r the Different T ypes of Thermocouples Figures 9, 10, 11, 12, and 13 show the typical and maximum errors for the different thermocouple types when used with the USB-9211/9211A over the full temperature range. The figure s also s how the ma[...]

  • Page 12

    USB-9211/9211A User Guide and Specifications 12 ni.com Figure 10. T ype E and T Errors Figure 11. T ype J and N Errors –200 0 200 400 600 800 1000 0 2 3 4 Max ov er T emp Range with A utozero Max at Room T emp Range without A utozero T yp ov er T emp Range with Autozero Error ( ° C) Measured T emperature ( ° C) 1 –200 0 200 400 600 800 1000 1[...]

  • Page 13

    © National Instruments Corporation 13 USB- 9211/9211A User Gu ide and Specifications Figur e 12. T ype K Errors Figure 13. T ype R and S Errors Cold-Junction T emperatur e Measurement Accuracy Heat from other nearby h eat sources can cause errors in thermocouple measurements by heating up the term inal s so that they are at a different temperature[...]

  • Page 14

    USB-9211/9211A User Guide and Specifications 14 ni.com Minimizing Thermal Gradients Thermocouple wire can be a significan t source of thermal gradients if it conducts heat or cold directly to terminal j unctions. To min imize these errors, follow these guidelines: • Use small-gauge thermocouple wire. Smaller wire transfers less heat to or from th[...]

  • Page 15

    © National Instruments Corporation 15 USB- 9211/9211A User Gu ide and Specifications Cold-junction compensation sensor accuracy 0 to 60 °C ...................... .................. 0.6 °C (1.1 °F) typ, 1.3 °C (2.3 °F) max Conversion time ...................... ... ............ 70 ms per channel; 420 ms total for all ch annels including the au[...]

  • Page 16

    USB-9211/9211A User Guide and Specifications 16 ni.com Offset error from source impedance ...... . 0.05 µ Vt y p ,0 . 0 7 µ Vm a x p e r Ω source impedance due to input current Power Requirements Current consumption from USB .............500 mA, max Suspend mode ................ ................. .2.5 mA, max Bus Interface USB specification USB[...]

  • Page 17

    © National Instruments Corporation 17 USB- 9211/9211A User Gu ide and Specifications V oltages Connect only voltages that are within these limits. Channel-to-COM .................... ............... ± 30 V max, Measurement Category I Measurement Category I is for meas urements performed on circuits not directly connected to the electrical di stri[...]

  • Page 18

    USB-9211/9211A User Guide and Specifications 18 ni.com Maximum altitude ................. ..................2,000 m (at 25 °C ambient temperature) Pollution Degree (IEC 60664) .... ............2 Electromagnetic Compatibility Emissions ...................... ................. .........EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Immunity .....[...]

  • Page 19

    National Instruments, NI, ni.com, and LabVIEW are tradem arks of National Instruments Corporation. Refer to t he Terms of Use section on ni.com/legal for m ore inform ation about Natio nal Instruments trademarks. Other product and compan y names mentioned herein are t rademarks or trade names of their respective companie s. For patents coveri ng Na[...]