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OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9237

4-Channel, 24-Bit Half/Full-Bridge Analog Input Module

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Содержание 24-Bit Half/Full-Bridge Analog Input Module NI...

Страница 1: ...OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9237 4 Channel 24 Bit Half Full Bridge Analog Input Module ni com manuals Deutsch Fran ais...

Страница 2: ...and programming the system refer to the system documentation Visit ni com info and enter cseriesdoc for information about C Series documentation Note The safety guidelines and specifications in this d...

Страница 3: ...Class I Division 2 Groups A B C D T4 hazardous locations Class I Zone 2 AEx nC IIC T4 and Ex nC IIC T4 hazardous locations and nonhazardous locations only Follow these guidelines if you are installing...

Страница 4: ...e following limits Capacitance 0 2 F max Inductance 80 mH max Special Conditions for Hazardous Locations Use in Europe This equipment has been evaluated as EEx nC IIC T4 equipment under DEMKO Certific...

Страница 5: ...arch for the LR certificate or look for the Lloyd s Register mark on the module Caution To meet radio frequency emission requirements for marine applications use shielded cables and install the system...

Страница 6: ...6 ni com Connecting the NI 9237 The NI 9237 has four RJ 50 receptacles that provide connections for four half or full bridges Figure 1 NI 9237 Pin Assignments SC AI AI RS RS EX EX T T SC 1 2 3 4 5 6...

Страница 7: ...uarter bridge with the NI 9237 if you add a resistor externally to create a half bridge You also can use a quarter bridge with the NI 9237 if you use the NI 9944 or NI 9945 Quarter Bridge Completion A...

Страница 8: ...n Note When you insert or remove a new sensor from the NI 9237 slight changes in the excitation voltages can cause a mismatch between the internal half bridge completion resistors and the half bridge...

Страница 9: ...National Instruments Corp 9 NI 9237 Operating Instructions and Specifications Figure 2 Connecting a Half or Full Bridge to the NI 9237 EX EX SC SC RS RS T T AI AI TEDS NI 9237...

Страница 10: ...device that is biased at any voltage within the NI 9237 rejection range of earth ground Refer to the Specifications section for more information about the common mode rejection ratio CMRR You also can...

Страница 11: ...NI 9237 provides two mechanisms to correct for these errors remote sensing and shunt calibration Remote Sensing Remote sensing continuously and automatically corrects for errors in excitation leads an...

Страница 12: ...ications 12 ni com circuit Refer to Figure 3 for an illustration of how to connect remote sense wires to the NI 9237 Figure 3 Connecting Remote Sense Wires to the NI 9237 EX EX RS RS Rbridge Rlead Rle...

Страница 13: ...stors the NI 9237 senses the actual bridge voltage and eliminates the gain errors caused by the resistance of the EX and EX leads Shunt Calibration Shunt calibration can correct for errors from the re...

Страница 14: ...shunting or connecting a large resistor of known value across one arm of the bridge creating a known strain induced change in resistance You can then measure the output of the bridge and compare it t...

Страница 15: ...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...

Страница 16: ...xcitation source to the NI 9237 Understanding NI 9237 Filtering The NI 9237 uses a combination of analog and digital filtering to provide an accurate representation of in band signals while rejecting...

Страница 17: ...assband have frequency dependent gain or attenuation The small amount of variation in gain with respect to frequency is called the passband flatness The digital filters of the NI 9237 adjust the frequ...

Страница 18: ...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 pre...

Страница 19: ...uals the data rate minus the stopband frequency Understanding NI 9237 Data Rates The frequency of a master timebase fM controls the data rate fs of the NI 9237 The NI 9237 includes an internal master...

Страница 20: ...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 When using an external timebase with a frequency other than 12 8 M...

Страница 21: ...is in sleep mode you cannot communicate with the modules In sleep mode the system consumes minimal power and may dissipate less heat than it does in normal mode Refer to the Specifications section for...

Страница 22: ...ate range fs using internal master timebase Minimum 1 613 kS s Maximum 50 kS s Data rate range fs using external master timebase Minimum 390 625 S s Maximum 51 3 kS s Data rates1 fs n 1 2 31 Typical i...

Страница 23: ...0 6 V V per C 3 3 V excitation 0 5 V V per C 5 V excitation 0 3 V V per C 10 V excitation 0 2 V V per C Measurement Conditions Percent of Reading Gain Error Percent of Range Offset Error Calibrated t...

Страница 24: ...0 to 1 kHz 0 001 fin 0 to 20 kHz 0 1 Input delay 38 4 fs 4 8 s Passband Frequency 0 45 fs Flatness 0 1 dB max Stopband Frequency 0 55 fs Rejection 100 dB Alias free bandwidth 0 45 fs Oversample rate...

Страница 25: ...Hz 140 dB Relative to EX fin 0 to 1 kHz 85 dB SFDR 1 kHz 60 dBFS 106 dB Total Harmonic Distortion THD 1 kHz 20 dBFS 100 dB 8 kHz 20 dBFS 90 dB 1 Rejection by analog prefilter of signal frequencies at...

Страница 26: ...alk fin 1 kHz 110 dB fin 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 2 V to 10 V Excitation Voltage Density nV Vrms per Total fin 0 to...

Страница 27: ...MTBF 603 359 hours at 25 C Bellcore Issue 2 Method 1 Case 3 Limited Part Stress Method Note Contact NI for Bellcore MTBF specifications at other temperatures or for MIL HDBK 217F specifications Power...

Страница 28: ...Between any two pins 30 V max Isolation Channel to channel None Channel to earth ground Continuous 60 VDC Measurement Category I Withstand 1 000 Vrms verified by a 5 s dielectric withstand test Measu...

Страница 29: ...nt limited energy parts of equipment circuits powered by regulated low voltage sources and electronics Caution Do not connect the NI 9237 to signals or use for measurements within Measurement Categori...

Страница 30: ...UL and other safety certifications refer to the product label or the Online Product Certification section Electromagnetic Compatibility This product meets the requirements of the following EMC standar...

Страница 31: ...eets the essential requirements of applicable European Directives as follows 2006 95 EC Low Voltage Directive safety 2004 108 EC Electromagnetic Compatibility Directive EMC Online Product Certificatio...

Страница 32: ...2 27 30 g 11 ms half sine 50 g 3 ms half sine 18 shocks at 6 orientations Environmental National Instruments C Series modules are intended for indoor use only but may be used outdoors if installed in...

Страница 33: ...itted to designing and manufacturing products in an environmentally responsible manner NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment an...

Страница 34: ...t WEEE recycling centers and National Instruments WEEE initiatives visit ni com environment weee Calibration You can obtain the calibration certificate and information about calibration services for t...

Страница 35: ...504 National Instruments also has offices located around the world to help address your support needs For telephone support in the United States create your service request at ni com support and follo...

Страница 36: ...refer to the appropriate location Help Patents in your software the patents txt file on your media or the National Instruments Patent Notice at ni com patents Korea 82 02 3451 3400 Lebanon 961 0 1 33...

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