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National Instruments NI USB-9237 manual

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Table of contents for the manual

  • Page 1

    USER GUIDE AND SPECIFICATIONS NI USB-9237 4-Channel, 24-Bit Half/Full-Br idge Analog Input Device This user guide describes how to use the National Instruments USB-9237 and lists the device specif ications. The NI USB-9237 provides a USB interface for four channels of 24-b it half/full-bridge analog input. Introduction The NI USB-9237 consists of t[...]

  • Page 2

    NI USB-9237 U ser Guide and Specifications 2 ni.com Dimensions Figure 2 shows the NI USB-9237 device dim ensions. Figure 2. NI USB-9237 Device in Millimeters (Inches) Safety Guidelines Operate the NI USB-9237 on ly as described in thes e operating instructions. Note Although the NI 9237 module may have more stringent certification standards than th[...]

  • Page 3

    © National Instruments Corporation 3 NI USB-9237 User Guid e and Specifications Related Documentation Each application software package an d dri ver includes information about writing applications for taking measur ements and controlling measurement devices. The follo wing references to documents assume you have NI-D A Qm x 8.7 or later , and wher[...]

  • Page 4

    NI USB-9237 U ser Guide and Specifications 4 ni.com • Taking Measurements —Contains the conceptual and ho w-to information you need to acquire and analyze measurement data in LabVIEW , including common measurements, measurement fundamentals, NI-DA Qmx key concepts, and de vice considerations. LabWindows/CVI The Data Acquisition book of th e L a[...]

  • Page 5

    © National Instruments Corporation 5 NI USB-9237 User Guid e and Specifications ANSI C without NI Application Software The NI-DAQmx Help contains API overviews and general information about measurement concepts. Select Start»All Programs»National Instruments»NI- DAQ»NI-DAQmx Help . The NI-DAQmx C Reference Help describes the NI -D A Qmx Librar[...]

  • Page 6

    NI USB-9237 User Guide and Specifications 6 ni.com T raining Courses If you need more help getting started developing an appli cation with NI products, NI offers training courses. To enroll in a co urse or obtain a detailed course outline, r efer to ni.com/training . T echnical Support on the Web For additional support , refer to ni.com/support or [...]

  • Page 7

    © National Instruments Corporation 7 NI USB-9237 User Guid e 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 9237 module in to the USB-9162 carrier . 5. Press f irmly on the connector side of the NI 9237 mo dule until the latches lock the mod[...]

  • Page 8

    NI USB-9237 U ser Guide and Specifications 8 ni.com Mounting the NI USB-9237 to a Panel Threaded inserts are located in the NI USB-9237 for m ounting it to a panel. Refer to Figure 5 for dimensions. Figur e 5. Module Dimensions in Millimeters (Inches) Connecting the NI USB-9237 to a Computer Plug one end of the USB cable into the NI USB-9237 and th[...]

  • Page 9

    © National Instruments Corporation 9 NI USB-9237 User Guid e and Specifications Wiring the NI USB-9237 Device The NI USB-9237 has four RJ-50 receptacles that provide connections for four half or full bridges. Table 2 lists the signal names of the terminals for each connector, and shows the correl ation between the pin numbers of the RJ-50 10-posit[...]

  • Page 10

    NI USB-9237 U ser Guide and Specifications 10 ni.com Caution National Instruments does not recommend using an RJ-45 with the NI USB-9237 because it can physically damage pins 1 and 10 on the de vice, and th us permanently disable shunt calibration no matter what connect or you use. Table 2. T erminal Assignments RJ-50 (10p10c) Modular Plug and Rece[...]

  • Page 11

    © National Instruments Corporation 11 NI USB-9237 User Guid e and Specifications Figure 6. Four Position External Excita tion Voltage So urce Connection Connecting Loads to the NI USB-9237 Refer to Figure 7 for an illustration of how to connect full and half b ridges to the NI USB-9237. Figure 7. Half- and Full-Bridge Connections Note Y ou can use[...]

  • Page 12

    NI USB-9237 U ser Guide and Specifications 12 ni.com Completion Accessories for more information about these accessories and how to purchase them. Wiring TEDS Channels Ensure that neither the TED S data (T+) nor the TEDS return (T–) is ti ed in common to any AI signals on the NI USB-9237. Visit ni.com/info and enter the info code rdteds for infor[...]

  • Page 13

    © National Instruments Corporation 13 NI USB-9237 User Guid e and Specifications As shown in Figure 8, the actual bridge excitation voltage is smaller than the voltage at the EX+ and EX– leads. If remote sensin g of the actual b ridge voltage is not used, the resulting gain error is for full-bridge sensors, and for half-bridge sen sors. If the r[...]

  • Page 14

    NI USB-9237 U ser Guide and Specifications 14 ni.com Excitation V oltages Although the sensor in dustry does not recognize a single standa rd excitation voltage level , excitati on voltage le vels of between 2. 5 V and 10 V are common. You can program th e NI USB-9237 to supply 2.5 V, 3.3 V, 5 V, or 10 V of exc itation vo ltage, and th e module can[...]

  • Page 15

    © National Instruments Corporation 15 NI USB-9237 User Guid e and Specifications Each channel on the NI USB-9237 has an in dependent 24-bit ADC and input amplifier that enable you to sample signals from all four channels simultaneously . The NI USB-9237 also includes filters to pre vent aliasing. The f ilters on the NI USB-9237 filter accordin g t[...]

  • Page 16

    NI USB-9237 U ser Guide and Specifications 16 ni.com Stopband The filter significantly attenuates all si gnals above the stopband frequency . The primary goal of the filter is to prevent aliasing. Therefore, the stopband frequency scales precisely with the data rate. The sto pband rejection is the minimum amou nt of attenuation applied by the filte[...]

  • Page 17

    © National Instruments Corporation 17 NI USB-9237 User Guid e and Specifications Overvoltage protection between any two terminals ..................... ± 30 V Accuracy Gain drift ..... ................. .............. ............ 10 ppm/°C max Offset drift 2.5 V excitation ............. ................. . 0.6 μ V/V per °C 3.3 V excitation ..[...]

  • Page 18

    NI USB-9237 U ser Guide and Specifications 18 ni.com Stopband Frequency ...................... ................. .0.55 · f s Rejection .. .............. ................. .........100 dB Alias-free bandwidth .................. ............0.45 · f s Oversample rate . .............. ................. ......64 · f s Rejection at oversample rate 1 [...]

  • Page 19

    © National Instruments Corporation 19 NI USB-9237 User Guid e and Specifications Crosstalk 1 kHz ......... ............... ................ ....... 110 dB 10 kHz ....... ............... ................ ....... 100 dB Shunt calibration Resistance ................ .............. ......... 100 k Ω Resistor accuracy 25 °C ........... ........... ..[...]

  • Page 20

    NI USB-9237 U ser Guide and Specifications 20 ni.com Isolation Channel-to-channel.............. ........ ....No isolation between channels Channel-to-earth g round Continuous .. .............. ...............60 VDC, Measurement Category I Withstand .... ................. ............1,000 V rms , verified by a 5 s dielectric withstand test Measurem[...]

  • Page 21

    © National Instruments Corporation 21 NI USB-9237 User Guid e and Specifications Operating humidity (IEC 60068-2-56) ....................... ............ 10 to 90% RH, noncondensing Storage humidity (IEC 60068-2-56) ................. ...... ............ 5 to 95% RH, noncondensing Maximum altitude ........ .............. ............ 2,000 m Pollut[...]

  • Page 22

    NI USB-9237 U ser Guide and Specifications 22 ni.com Environmental Management National Instruments i s committed to designing and manu facturing products in an environmental ly responsible mann er. NI recognizes that eliminating certa in hazardous substances from our products is beneficial not only to t he environment but also to NI customers. For [...]

  • Page 23

    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 informat ion about Nationa l Instruments trademarks. Other product and compan y names mentioned herein are trademarks or trade names of their respective companie s. For patent s covering Nat[...]