National Instruments NI USB-9237 - Manual

© National Instruments Corporation 5 NI USB-9237 User Guide 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 Refe...

NI USB-9237 User Guide and Specifications 6 ni.com Training Courses If you need more help getting started developing an application with NI products, NI offers training courses. To enroll in a course or obtain a detailed course outline, refer to ni.com/training . Technical Support on the Web For add...

NI USB-9237 User Guide and Specifications 8 ni.com Mounting the NI USB-9237 to a Panel Threaded inserts are located in the NI USB-9237 for mounting it to a panel. Refer to Figure 5 for dimensions. Figure 5. Module Dimensions in Millimeters (Inches) Connecting the NI USB-9237 to a Computer Plug one e...

© National Instruments Corporation 9 NI USB-9237 User Guide 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 correlatio...

NI USB-9237 User 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 device, and thus permanently disable shunt calibration no matter what connector you use. Table 2. Terminal Ass...

© National Instruments Corporation 11 NI USB-9237 User Guide and Specifications Figure 6. Four Position External Excitation Voltage Source Connection Connecting Loads to the NI USB-9237 Refer to Figure 7 for an illustration of how to connect full and half bridges to the NI USB-9237. Figure 7. Half- ...

NI USB-9237 User 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 TEDS data (T+) nor the TEDS return (T–) is tied in common to any AI signals on the NI USB-9237. Visit ni.com/...

© National Instruments Corporation 13 NI USB-9237 User Guide 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 sensing of the actual bridge voltage is not used, the resulting gain error is for full-bridge sen...

NI USB-9237 User Guide and Specifications 14 ni.com Excitation Voltages Although the sensor industry does not recognize a single standard excitation voltage level, excitation voltage levels of between 2.5 V and 10 V are common. You can program the NI USB-9237 to supply 2.5 V, 3.3 V, 5 V, or 10 V of ...

© National Instruments Corporation 15 NI USB-9237 User Guide and Specifications Each channel on the NI USB-9237 has an independent 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 prevent aliasing. The fi...

NI USB-9237 User Guide and Specifications 16 ni.com Stopband The filter significantly attenuates all signals 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 stopband rejection is the minim...

© National Instruments Corporation 17 NI USB-9237 User Guide and Specifications Overvoltage protectionbetween any two terminals ..................... ± 30 V Accuracy Gain drift ................................................ 10 ppm/°C max Offset drift 2.5 V excitation .................................

NI USB-9237 User 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 ...

© National Instruments Corporation 19 NI USB-9237 User Guide and Specifications Crosstalk 1 kHz ............................................... 110 dB 10 kHz ............................................. 100 dB Shunt calibration Resistance ....................................... 100 k Ω Resistor acc...

NI USB-9237 User Guide and Specifications 20 ni.com Isolation Channel-to-channel..........................No isolation between channels Channel-to-earth ground Continuous ...............................60 VDC, Measurement Category I Withstand .................................1,000 V rms , verified b...

© National Instruments Corporation 21 NI USB-9237 User Guide 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 ...........

NI USB-9237 User Guide and Specifications 22 ni.com Environmental Management National Instruments is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial not only to the...

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