Instruction/ maintenance manual of the product NI 9237 National Instruments
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OPERATING INSTRUCTIONS AND S PECIFICATIONS NI 9237 4-Channel, 24-Bit Half/Full- Bridge Analog Input Module ni.com/manuals Deutsch Français.
NI 9237 Operating I nstruction s and Specificati ons 2 ni.com This doc u ment describes ho w to u se the National Instr u ments 9 237 and incl u des specif ications and pin assignments for the NI 9237. Vi s i t ni.com/info and enter rd s oftwarever s ion to determine which software yo u need for the mod u les yo u are u sing.
© National Inst ruments Corp. 3 NI 9237 Operating Instructi ons and Specific ations Safety Guidelines Operate the NI 9237 only as described in these operating instr u ctions. Hot Surface This icon denotes that the component may be hot. T o u ching this component may res u lt in bodily inj u ry .
NI 9237 Operating I nstruction s and Specificati ons 4 ni.com Caution S u bstit u tion of components may impair s u itability for Class I, Division 2. Caution For Zone 2 applications, install the system in an enclos u re rated to at least IP 54 as defined b y IEC 60529 an d EN 60529 .
© National Inst ruments Corp. 5 NI 9237 Operating Instructi ons and Specific ations Special Conditions fo r Marine Appli cations Some mod u les are Lloyd’ s Re gister (LR) T ype Approved for marine applications. T o verify Llo yd’ s Register cert ification, visit ni.
NI 9237 Operating I nstruction s and Specificati ons 6 ni.com Connecting the NI 9237 The NI 9237 has fo u r RJ-50 receptacles that pro vide connections for fo u r half or f u ll bridges.
© National Inst ruments Corp. 7 NI 9237 Operating Instructi ons and Specific ations When yo u connect a half bridge to the NI 9237, yo u m u st connect the AI+, EX–, and RS– signals, b u t yo u do not connect the AI– signal. When yo u connect a f u ll bridge, yo u m u st connect the AI+, AI–, EX–, and RS– si gnals.
NI 9237 Operating I nstruction s and Specificati ons 8 ni.com The NI 9237 has a fo u r- terminal e xternal e xcitation v oltage so u rce connector . Y o u can u se the EX+ and EX– terminals on the connector to connect one e x ternal e xcitation voltag e so u rce to the mod u le.
© National Inst ruments Corp. 9 NI 9237 Operating Instructions and Specific ations 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.
NI 9237 Operating I nstructions and Specifications 10 ni.com Each channel on the NI 9237 has an independent 24-bit ADC and an inp u t amplifier that enable yo u to sample signals from all fo u r channels sim u ltaneo u sly . The NI 9237 is isolated from earth gro u nd.
© National Inst ruments Corp. 11 NI 9237 Operating Instructions and Specific ations Wiring TEDS Cha nnels Ens u re that neither the TEDS da ta (T+) nor the TEDS ret u rn (T–) signal is tied in common to any AI signals on the NI 9237. The NI 9237 connects all the T– signals together internally .
NI 9237 Operating I nstructions and Specifications 12 ni.com circ u it. Refer to Fig u re 3 for an ill u stration of ho w to connect remote sense wires to the NI 9237.
© National Inst ruments Corp. 13 NI 9237 Operating Instructions and Specific ations The act u al bridge e xcitation voltage is smaller than the v oltage at the EX+ and EX– leads. If yo u do not u se remote sensing of the act u al bridge voltage, the res u lting gain error is: for half-bridge sensors and for f u ll-bridge sensors.
NI 9237 Operating I nstructions and Specifications 14 ni.com sensors beca u se th ere may be signif icant resistance in the wiring to the activ e resistor in the bridge. The NI 9237 sh u nt calibrati on circ u itry consists of a precision resistor and a software-controlle d switch.
© National Inst ruments Corp. 15 NI 9237 Operating Instructions and Specific ations Excitation Voltages Altho u gh the sensor ind u stry does not recognize a single standard excita tion v oltage le vel, e xcitation v oltage le vels of between 2.5 V and 10 V are common.
NI 9237 Operating I nstructions and Specifications 16 ni.com The 150 mW limit allows yo u to po wer half and f u ll bridges as follows: •F o u r 350 Ω half bridges at 5.0 V •F o u r 350 Ω f u ll bridges at 3.3 V •F o u r 120 Ω half bridges at 2.
© National Inst ruments Corp. 17 NI 9237 Operating Instructions and Specific ations or signals that ha ve been f iltered by at least the amo u nt of the stopband rejection. Passband The signals within the passband have freq u enc y-dependent gain or atten u ation.
NI 9237 Operating I nstructions and Specifications 18 ni.com Figure 4. Typical Passband Flat ness for the NI 9237 Stopband The filter signif icantly atten u ates all signals abo ve the stop band freq u ency . The primary goal of the f ilter is to prev ent aliasing.
© National Inst ruments Corp. 19 NI 9237 Operating Instructions and Specific ations rate. The stopband rejection is the minim u m amo u nt of att en u ation applied by the filter to all signals with freq u en cies within the stopband.
NI 9237 Operating I nstructions and Specifications 20 ni.com The follo wing eq u ation provide s the a vailable da ta rates of the NI 9237: f s = where n is any inte ger from 1 to 31. Howe ver , the data rate m u st rema in within the appropriate data rate range.
© National Inst ruments Corp. 21 NI 9237 Operating Instructions and Specific ations s u pport for sleep mode. If the chassis s u pports sleep mode, refer to the software help for information abo u t enabli ng slee p mode. V isit ni.com/info and enter c s erie s doc for information abo u t C Series doc u mentation.
NI 9237 Operating I nstructions and Specifications 22 ni.com T ype of ADC ..... ........... ........... ......... . De lta-Sigma (w ith analog prefiltering) Sampling mode . ........... ........... .......... Sim u ltaneo u s Internal master timebase ( f M ) Freq u ency .
© National Inst ruments Corp. 23 NI 9237 Operating Instructions and Specific ations Overv oltage protection between any two pins .......... ............. . ±30 V Acc u racy Gain drift ...... ........... ......... ............ ..... 10 ppm/°C max Offset drift 2.
NI 9237 Operating I nstructions and Specifications 24 ni.com Channel-to-channel ma tching (calibrated) Phase nonlineari ty f in = 0 to 1 kHz ....... ........... ......... . < 0.001° f in = 0 to 20 kHz.............. ........... . ±0. 1° Inp u t delay .
© National Inst ruments Corp. 25 NI 9237 Operating Instructions and Specific ations Rejection at o versa mple rate 1 f s = 10 kS/s........ ............ ........... ... 60 dB @ 640 kHz f s = 50 kS/s........ ............ ........... ... 90 dB @ 3.2 MHz Common-mode vo ltage, all signals to earth gro u nd .
NI 9237 Operating I nstructions 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 .............. ......... .
© National Inst ruments Corp. 27 NI 9237 Operating Instructions and Specific ations Sh u nt calibration Resistance .............. ......... ............ 100 k Ω Resistor acc u racy 25°C .............. .................. ..... ±110 Ω –40 to 70°C .
NI 9237 Operating I nstructions and Specifications 28 ni.com Physical Characteristics If yo u need to clean the mod u l e, wipe it with a dry to wel. W eight .......... ........... ............ .............. 152 g (5.4 oz) Safety Safety Voltages Connect only v oltages that are within the follo wing limits.
© National Inst ruments Corp. 29 NI 9237 Operating Instructions and Specific ations meas u rements of voltages from spec ially protecte d secondary circ u its.
NI 9237 Operating I nstructions and Specifications 30 ni.com Safety Standards This prod u ct meets the req u irements of the following standards of safety for electrica l eq u ipment for meas u rement.
© National Inst ruments Corp. 31 NI 9237 Operating Instructions and Specific ations Note For the standards applied to assess the EMC of this prod u ct, refer to the Online Product Certification section. Note For EMC compliance, operate this de vice with shielded cabling.
NI 9237 Operating I nstructions and Specifications 32 ni.com Shock and Vibration T o meet thes e specifications, yo u m u st panel mo u nt the system. Operating vibration Random (IEC 60068-2-64)......... 5 g rms , 10 to 500 Hz Sin u soidal (IEC 60068-2-6) .
© National Inst ruments Corp. 33 NI 9237 Operating Instructions and Specific ations Operating h u midity (IEC 60068-2-56)....... ........... ............ 10 to 90% RH, noncondensing Storage h u midity (IEC 60068-2-56)....... ........... ............ 5 to 95% RH, noncondensing Maxim u m altit u de.
NI 9237 Operating I nstructions and Specifications 34 ni.com Waste Electrical and Electronic Equipment (WEEE) EU Customers At the end of the life c ycle, all prod u cts must be sent to a WEEE re c ycling center . For more information abo u t WEEE recycling ce nters and National Instr u ments WEEE initiati ves, visit ni.
© National Inst ruments Corp. 35 NI 9237 Operating Instructions and Specific ations Where to Go for Support The National Instr u ments W eb site is yo u r complete reso u rce for technical s u pport.
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An important point after buying a device National Instruments NI 9237 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought National Instruments NI 9237 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data National Instruments NI 9237 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, National Instruments NI 9237 you will learn all the available features of the product, as well as information on its operation. The information that you get National Instruments NI 9237 will certainly help you make a decision on the purchase.
If you already are a holder of National Instruments NI 9237, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime National Instruments NI 9237.
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