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NI 9237E Operating Instructions and Specifications

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ni.com

Connecting the NI 9237E

The NI 9237E has four RJ-50 receptacles or a 37-pin DSUB
connector that provides connections for four half or full bridges,
and an external excitation voltage source.

Figure 2.

NI 9237E with RJ-50 Pin Assignments

Ch 0

Ch 1

Ch 2

Ch 3

SC
AI+
AI–
RS+
RS–
EX+
EX–
T+
T–
SC

1
2
3
4
5
6
7
8
9

10

Ch0 – Ch3

EX+

EX+

EX–

EX–

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2
3
4
5
6
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Содержание NI 9237E Series

Страница 1: ...OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9237E 4 Channel 24 Bit Half Full Bridge Analog Input Module ...

Страница 2: ...ermine which software you need for the modules you are using For information about installing configuring and programming the system refer to the system documentation Visit ni com info and enter cseriesdoc for information about C Series documentation Caution National Instruments makes no electromagnetic compatibility EMC or CE marking compliance claims for the NI 9237E The end product supplier is ...

Страница 3: ...9237E Operating Instructions and Specifications NI 9237E Dimensions The following figure shows the dimensions of the NI 9237E Figure 1 NI 9237E Dimensions in Millimeters Inches 73 4 2 89 0 0 0 00 26 7 1 05 58 4 2 30 66 0 2 60 0 0 0 00 ...

Страница 4: ... 9237E has four RJ 50 receptacles or a 37 pin DSUB connector that provides connections for four half or full bridges and an external excitation voltage source Figure 2 NI 9237E with RJ 50 Pin Assignments Ch 0 Ch 1 Ch 2 Ch 3 SC AI AI RS RS EX EX T T SC 1 2 3 4 5 6 7 8 9 10 Ch0 Ch3 EX EX EX EX ...

Страница 5: ...NI 9237E with DSUB Pin Assignments 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 RS0 EX0 AI0 SC0 RS1 EX1 AI1 SC1 T Vex RS2 EX2 AI2 SC2 RS3 EX3 AI3 SC3 T RS0 SC0 EX0 AI0 T0 RS1 SC1 EX1 AI1 T1 T Vex RS2 SC2 EX2 AI2 T2 RS3 SC3 EX3 AI3 T3 ...

Страница 6: ...te You can use a quarter bridge with the NI 9237E if you add a resistor externally to create a half bridge You also can use a quarter bridge with the NI 9237E with RJ 50 if you use the NI 9944 or NI 9945 Quarter Bridge Completion Accessory Visit ni com and search for the NI 9944 and NI 9945 Quarter Bridge Completion Accessories for more information about these accessories and how to purchase them ...

Страница 7: ...alf bridge completion resistors and the half bridge sensors which results in a change in the measurement offsets National Instruments recommends performing bridge calibrations of quarter or half bridge sensors after connecting all sensors to the NI 9237E and after removing or attaching any additional sensor Visit ni com info and enter the info code rdw9237 for more information about changes in vol...

Страница 8: ...perating Instructions and Specifications 8 ni com Figure 4 Connecting a Half or Full Bridge to the NI 9237E 1 NI 9237E with DSUB only 2 NI 9237E with RJ 50 only EX EX SC SC RS RS RS SC T T AI AI TEDS NI 9237E 1 2 ...

Страница 9: ...237E to a device that is biased at any voltage within the NI 9237E rejection range of earth ground Refer to the Specifications section for more information about the common mode rejection ratio CMRR You also can connect floating signals to the NI 9237E If you connect floating signals to the NI 9237E National Instruments recommends connecting the EX signal to the earth ground or shield for better n...

Страница 10: ...fo and enter the info code rdteds for more information about TEDS sensors Connection Options to Correct for Resistance Errors Wiring resistance can create errors in bridge circuits The NI 9237E 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 and generally is...

Страница 11: ...nsate for this gain error Connect remote sense wires to the points where the excitation voltage wires connect to the bridge circuit Refer to Figure 5 for an illustration of how to connect remote sense wires to the NI 9237E Figure 5 Connecting Remote Sense Wires to the NI 9237E EX EX RS RS Rbridge Rlead Rlead Rbridge Rbridge Rbridge NI 9237E AI AI ...

Страница 12: ...NI 9237E 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 resistance of both the excitation wiring and wiring in the individual resistors of the bridge Remote sensing corrects for resistances from the EX pins on the NI 9237E to the sensor and shunt calibration corrects...

Страница 13: ...the bridge by some known amount This is accomplished by 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 to the expected voltage value You can use the results to correct gain errors in the entire measurement path or to simply verify general operation ...

Страница 14: ... 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 The NI 9237E automatically reduces internal excitation voltages as needed to stay below 150 mW total power The power consumed by a single bridge is where R is the total resistance of the bridge For a q...

Страница 15: ... more than 150 mW to dissipate across all the bridges connect an external excitation voltage source to the NI 9237E For the NI 9237E with DSUB use the two Vex pins to connect the external excitation source For the NI 9237E with RJ 50 use the two EX and EX terminals on the four terminal external excitation voltage connector to connect one external excitation source You can use the additional EX and...

Страница 16: ...within the passband as quantified primarily by passband flatness and phase nonlinearity All signals that appear in the alias free bandwidth are either unaliased signals or signals that have been filtered by at least the amount of the stopband rejection Passband The signals within the passband have frequency dependent gain or attenuation The small amount of variation in gain with respect to frequen...

Страница 17: ...ational Instruments Corp 17 NI 9237E Operating Instructions and Specifications Figure 6 Typical Passband Flatness for the NI 9237E Frequency Data Rate 0 5 0 4 0 025 0 000 0 025 0 050 0 3 0 2 0 1 0 Gain dB ...

Страница 18: ...bandwidth of the NI 9237E is not an aliased artifact of signals at a higher frequency The alias free bandwidth is defined by the ability of the filter to reject frequencies above the stopband frequency and it is equal to the data rate minus the stopband frequency Understanding NI 9237E Data Rates The frequency of a master timebase fM controls the data rate fs of the NI 9237E The NI 9237E includes ...

Страница 19: ...9237E fs where n is any integer from 1 to 31 However the data rate must remain within the appropriate data rate range Refer to the Specifications section for more information 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 When using an external timebase wit...

Страница 20: ... mode If the chassis supports sleep mode refer to the software help for information about enabling sleep mode Visit ni com info and enter cseriesdoc for information about C Series documentation Typically when a system 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 Specific...

Страница 21: ...ess otherwise noted Input Characteristics Number of channels 4 analog input channels Bridge completion Half and Full Internal Quarter External ADC resolution 24 bits Type of ADC Delta Sigma with analog prefiltering Sampling mode Simultaneous Internal master timebase fM Frequency 12 8 MHz Accuracy 100 ppm max Data rate range fs using internal master timebase Minimum 1 613 kS s Maximum 50 kS s ...

Страница 22: ... 391 S s Maximum 51 36 kS s Data rates1 fs n 1 2 31 Typical input range 25 mV V Scaling coefficient 2 9802 nV V per LSB Overvoltage protection between any two pins 30 V 1 The data rate must remain within the appropriate data rate range Refer to the Understanding NI 9237E Data Rates section for more information fM 256 n ...

Страница 23: ...0 V excitation 0 2 V V per C Measurement Conditions Percent of Reading Gain Error Percent of Range Offset Error Calibrated typ 25 C 5 C 0 05 0 05 Calibrated max 40 to 85 C 0 20 0 25 Uncalibrated typ 25 C 5 C 0 20 0 10 Uncalibrated max 40 to 85 C 0 55 0 35 Before offset null or shunt calibration Applies at a data rate of 50 kS s Lower data rates can have up to 0 20 of reading additional gain error ...

Страница 24: ... Drift 1 5 V V per C Channel to channel matching calibrated Phase nonlinearity fin 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 Input Signal Frequency fin Gain Phase Typical Maximum Maximum 0 to 1 kHz 0 15 0 3 0 125 kHz fin 1 to 20 kHz 0 4 1 1 ...

Страница 25: ...requency 0 55 fs Rejection 100 dB Alias free bandwidth 0 45 fs Oversample rate 64 fs Rejection at oversample rate1 fs 10 kS s 60 dB 640 kHz fs 50 kS s 90 dB 3 2 MHz Common mode voltage all signals to earth ground 60 VDC 1 Rejection by analog prefilter of signal frequencies at oversample rate ...

Страница 26: ...c Distortion THD 1 kHz 20 dBFS 95 dB 8 kHz 20 dBFS 95 dB 1 Measured with a balanced cable on the NI 9237E with RJ 50 and with no cable on the NI 9237E with DSUB Shielded cables that are not twisted pair may be significantly unbalanced which can impact CMRR performance To improve the balance of shielded cables NI recommends twisting together the AI AI pair the RS RS pair and the EX EX pair ...

Страница 27: ...se 100 Vrms Crosstalk not including cable effects fin 1 kHz 110 dB fin 10 kHz 100 dB Excitation Voltage Density nV Vrms per Total fin 0 to 1 kHz nV Vrms Total fin 0 to 25 kHz V Vrms Full Bridge Full Bridge Full Bridge Half Bridge 2 5 V 8 250 1 3 1 6 3 3 V 6 190 1 0 1 2 5 V 4 130 0 6 0 8 10 V 2 65 0 3 0 5 1Hz ...

Страница 28: ...er 150 mW max External voltage 2 V to 10 V Shunt calibration Resistance 100 k Resistor accuracy 25 C 110 40 to 85 C 200 MTBF NI 9237E with RJ 50 603 359 hours at 25 C Bellcore Issue 2 Method 1 Case 3 Limited Part Stress Method NI 9237E with DSUB 704 148 hours at 25 C Bellcore Issue 2 Method 1 Case 3 Limited Part Stress Method ...

Страница 29: ...from chassis Active mode 740 mW max Sleep mode 25 W max Thermal dissipation at 85 C Active mode 740 mW max Sleep mode 25 W max Physical Characteristics Use a dry low velocity stream of air to clean the module If needed use a soft bristle brush for cleaning around components Note For two dimensional drawings and three dimensional models of the C Series module and connectors visit ni com dimensions ...

Страница 30: ...th DSUB 49 g 1 7 oz Safety Safety Voltages Connect only voltages that are within the following limits Between any two pins 30 V max Isolation Channel to channel None Channel to earth ground Continuous 60 VDC Measurement Category I Double insulation Withstand 1 000 Vrms verified by a 5 s dielectric withstand test ...

Страница 31: ...rements include signal levels special equipment limited energy parts of equipment circuits powered by regulated low voltage sources and electronics Caution Do not connect the NI 9237E to signals or use for measurements within Measurement Categories II III or IV Safety Standards This product meets the requirements of the following standards of safety for electrical equipment for measurement control...

Страница 32: ...appropriate link in the Certification column 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 Operating temperature IEC 60068 2 1 IEC 60068 2 2 40 to 85 C Storage temperature IEC 60068 2 1 IEC 600...

Страница 33: ... environment and to NI customers For additional environmental information refer to the NI and the Environment Web page at ni com environment This page contains the environmental regulations and directives with which NI complies as well as other environmental information not included in this document Waste Electrical and Electronic Equipment WEEE EU Customers At the end of the life cycle all produc...

Страница 34: ...mation about calibration services for the NI 9237E at ni com calibration Calibration interval 1 year ᄤֵᙃѻક ᶧ ࠊㅵ ࡲ Ё RoHS Ё ᅶ National Instruments ヺড়Ё ᄤֵᙃ ѻકЁ䰤ࠊՓ ᶤѯ ᆇ 䋼ᣛҸ RoHS Ǆ Ѣ National Instruments Ё RoHS ড়㾘ᗻֵᙃˈ䇋ⱏᔩ ni com environment rohs_chinaǄ For information about China RoHS compliance go to ni com environment rohs_china ...

Страница 35: ... 3504 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 follow the calling instructions or dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 1800 300 800 Austria 43 662 457990 0 Belgium 32 0 2 757 002...

Страница 36: ...fer 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 28 28 Malaysia 1800 887710 Mexico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 328 90 10 Portugal 351 210 311 210 Russia 7 495 783 6851 Sing...

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