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NI 9237 Operating Instructions and Specifications

26

ni.com

Inp

u

t noise

Excitation noise ................................ 0.1 mV/V

rms

Crosstalk

f

in

 = 1 kHz................................... 110 dB

f

in

 = 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/V

rms

 per 

)

Total

,

f

in

 = 0 to 25 kHz

(

μ

V/V

rms

)

Total

,

f

in

 = 0 to 1 kHz

(nV/V

rms

)

2.5 V

8

1.3

250

3.3 V

6

1.0

190

5 V

4

0.6

130

10 V

2

0.3

65

1

Hz

Summary of Contents for 24-Bit Half/Full-Bridge Analog Input Module NI...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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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