National Instruments 24-Bit Half/Full-Bridge Analog Input Module NI 9237 Operating Instructions Manual
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National Instruments 24-Bit Half/Full-Bridge Analog Input Module NI 9237 Operating Instructions Manual

Operating instructions and specifications 4-channel, 24-bit half/full-bridge analog input module
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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9237
4-Channel, 24-Bit Half/Full-Bridge Analog Input Module
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  • Page 1 OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9237 4-Channel, 24-Bit Half/Full-Bridge Analog Input Module Français Deutsch ni.com/manuals...
  • Page 2 This document describes how to use the National Instruments 9237 and includes specifications and pin assignments for the NI 9237. Visit ni.com/info which software you need for the modules you are using. For information about installing, configuring, and programming the system, refer to the system documentation.

  • Page 3: Safety Guidelines For Hazardous Locations

    Do not remove modules unless power has been Caution switched off or the area is known to be nonhazardous. © National Instruments Corp. This icon denotes that the component may be NI 9237 Operating Instructions and Specifications...
  • Page 4 Substitution of components may impair Caution suitability for Class I, Division 2. For Zone 2 applications, install the system Caution in an enclosure rated to at least IP 54 as defined by IEC 60529 and EN 60529. For Zone 2 applications, connected signals must Caution be within the following limits: Capacitance ...
  • Page 5 Power supply and module cables must be separated on opposite sides of the enclosure and must enter and exit through opposing enclosure walls. © National Instruments Corp. and search for the LR certificate, or NI 9237 Operating Instructions and Specifications...
  • Page 6 Connecting the NI 9237 The NI 9237 has four RJ-50 receptacles that provide connections for four half or full bridges. Ch 0 Ch 1 Ch 2 Ch 3 Figure 1. NI 9237 Pin Assignments NI 9237 Operating Instructions and Specifications Ch0 –...
  • Page 7 NI 9945 Quarter Bridge Completion Accessories for more information about these accessories and how to purchase them. National Instruments does not recommend using Note an RJ-45 cable with the NI 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.
  • Page 8 National Instruments recommends performing bridge calibrations of quarter- or half-bridge sensors after connecting all sensors to the NI 9237 and after removing or attaching any additional sensor.
  • Page 9 TEDS Figure 2. Connecting a Half or Full Bridge to the NI 9237 © National Instruments Corp. AI– EX– RS– T– NI 9237 NI 9237 Operating Instructions and Specifications...
  • Page 10 (CMRR). You also can connect floating signals to the NI 9237. If you connect floating signals to the NI 9237, National Instruments recommends connecting the EX– signal to the earth ground or shield for better noise rejection.
  • Page 11 The NI 9237 includes remote sensing to compensate for this gain error. Connect remote sense wires to the points where the excitation voltage wires connect to the bridge © National Instruments Corp. NI 9237 Operating Instructions and Specifications...
  • Page 12 circuit. Refer to Figure 3 for an illustration of how to connect remote sense wires to the NI 9237. R bridge R bridge Figure 3. Connecting Remote Sense Wires to the NI 9237 NI 9237 Operating Instructions and Specifications R lead R bridge AI–...
  • Page 13 NI 9237 to the sensor, and shunt calibration corrects for these errors and for errors caused by wire resistance within an arm of the bridge. Shunt calibration is most useful with quarter-bridge © National Instruments Corp. NI 9237 Operating Instructions and Specifications...
  • Page 14 sensors because there may be significant resistance in the wiring to the active resistor in the bridge. The NI 9237 shunt calibration circuitry consists of a precision resistor and a software-controlled switch. Refer to the software help for information about enabling the shunt calibration switch for the NI 9237.
  • Page 15 2.5 V, 3.3 V, 5 V, or 10 V of excitation voltage, and the module can provide up to 150 mW of excitation power. Unless you supply external excitation voltage, National Instruments recommends that you set the excitation voltage to a value that keeps the total power below 150 mW.
  • Page 16 The 150 mW limit allows you to power half and full bridges as follows: Four 350 Ω half bridges at 5.0 V • Four 350 Ω full bridges at 3.3 V • Four 120 Ω half bridges at 2.5 V •...
  • Page 17 NI 9237 adjust the frequency range of the passband to match the data rate. Therefore, the amount of gain or attenuation at a given frequency depends on the data rate. Figure 4 shows typical passband flatness for the NI 9237. © National Instruments Corp. NI 9237 Operating Instructions and Specifications...
  • Page 18 0.025 0.000 –0.025 –0.050 Figure 4. Typical Passband Flatness for the NI 9237 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 NI 9237 Operating Instructions and Specifications Frequency/Data Rate ni.com...

  • Page 19: Alias-Free Bandwidth

    Refer to the software help for information about configuring the master timebase source for the NI 9237. Visit and enter ni.com/info cseriesdoc information about C Series documentation. © National Instruments Corp. NI 9237 Operating Instructions and Specifications...

  • Page 20: Sleep Mode

    The following equation provides the available data rates of the NI 9237: ÷ -------------------- - where n is any integer from 1 to 31. However, the data rate must remain within the appropriate data rate range. Refer to the about the data rate range. When using the internal master timebase of 12.8 MHz, the result is data rates of 50 kS/s, 25 kS/s, 16.67 kS/s, and so on down to 1.613 kS/s, depending on the value of n.

  • Page 21: Specifications

    The following specifications are typical for the range –40 to 70 °C unless otherwise noted. Input Characteristics Number of channels... 4 analog input channels Bridge completion Half and Full... Internal Quarter... External ADC resolution... 24 bits © National Instruments Corp. for information about cseriesdoc NI 9237 Operating Instructions and Specifications...
  • Page 22 Type of ADC... Delta-Sigma (with analog Sampling mode ... Simultaneous Internal master timebase (f Frequency ... 12.8 MHz Accuracy... ±100 ppm max Data rate range (f ) using internal master timebase Minimum... 1.613 kS/s Maximum ... 50 kS/s Data rate range (f ) using external master timebase Minimum...
  • Page 23 2.5 V excitation ... 0.6 μV/V per °C 3.3 V excitation ... 0.5 μV/V per °C 5 V excitation ... 0.3 μV/V per °C 10 V excitation ... 0.2 μV/V per °C © National Instruments Corp. Percent of Reading (Gain Error) 0.05%...
  • Page 24 Channel-to-channel matching (calibrated) Input Signal Frequency Typical 0 to 1 kHz 0.15% 1 to 20 kHz 0.4% Phase nonlinearity = 0 to 1 kHz... <0.001° = 0 to 20 kHz... ±0.1° Input delay ... 38.4/f Passband Frequency ... 0.45 · f Flatness...
  • Page 25 Measured with a balanced cable. Shielded cables that are not twisted-pair may be significantly unbalanced. To improve the balance of shielded, twisted-pair cables, NI recommends twisting together the AI+/AI – EX+/EX pair. © National Instruments Corp. – pair, the RS+/RS NI 9237 Operating Instructions and Specifications – pair, and the...
  • Page 26 Input noise (nV/V Excitation Voltage 2.5 V 3.3 V 10 V Excitation noise ... 0.1 mV/V Crosstalk = 1 kHz... 110 dB = 10 kHz... 100 dB Excitation Internal voltage... 2.5 V, 3.3 V, 5.0 V, 10.0 V Internal power... 150 mW max External voltage...

  • Page 27: Power Requirements

    Sleep mode ... 25 μW max Thermal dissipation (at 70 °C) Active mode ... 740 mW max Sleep mode ... 25 μW max © National Instruments Corp. Bellcore Issue 2, Method 1, Case 3, Limited Part Stress Method NI 9237 Operating Instructions and Specifications...

  • Page 28: Physical Characteristics

    Physical Characteristics If you need to clean the module, wipe it with a dry towel. Weight... 152 g (5.4 oz) Safety Safety Voltages Connect only voltages that are within the following limits. Between any two pins ... ±30 V max Isolation Channel-to-channel ...
  • Page 29 Hazardous Locations U.S. (UL) ... Class I, Division 2, Canada (C-UL) ... Class I, Division 2, Europe (DEMKO)... EEx nC IIC T4 © National Instruments Corp. Groups A, B, C, D, T4; Class I, Zone 2, AEx nC IIC T4 Groups A, B, C, D, T4;...

  • Page 30: Electromagnetic Compatibility

    Safety Standards This product meets the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 • UL 61010-1, CSA 61010-1 For UL and other safety certifications, refer to the Note product label or the Electromagnetic Compatibility...

  • Page 31: Online Product Certification

    To obtain product certifications and the DoC for this product, visit , search by module number or product line, and certification click the appropriate link in the Certification column. © National Instruments Corp. ni.com/ NI 9237 Operating Instructions and Specifications...

  • Page 32: Shock And Vibration

    (IEC 60068-2-27)... 30 g, 11 ms half sine, Environmental National Instruments C Series modules are intended for indoor use only but may be used outdoors if installed in a suitable enclosure. Refer to the manual for the chassis you are using for more information about meeting these specifications.

  • Page 33: Environmental Management

    For additional environmental information, refer to the NI and the Environment Web page at contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document. © National Instruments Corp. noncondensing noncondensing ni.com/environment NI 9237 Operating Instructions and Specifications...
  • Page 34 EU Customers must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit environment/weee National Instruments ni.com/environment/rohs_china about China RoHS compliance, go to environment/rohs_china Calibration You can obtain the calibration certificate and information about calibration services for the NI 9237 at Calibration interval ...

  • Page 35: Where To Go For Support

    Where to Go for Support The National Instruments Web site is your complete resource for technical support. At you have access to ni.com/support everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.
  • Page 36 Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545 National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation. Refer to the Terms of Use section on ni.com/legal for more information about National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies.

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