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National Instruments NI 9235 Operating Instructions Manual

Manual is about: National Instruments Bridge Analog Input Operating Instructions and Specifications

Summary of NI 9235

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    Operating instructions and specifications ni 9235/9236 8-channel, 24-bit quarter-bridge analog input module ni.Com/manuals deutsch français.

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    Ni 9235/9236 2 ni.Com this doc u ment describes how to u se the national instr u ments 9235 and national instr u ments 9236 and incl u des specifications and terminal assignments. In this doc u ment, the ni 9235 and ni 9236 are referred to incl u sively as the ni 9235/9236. Visit ni.Com/info and ent...

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    © national instruments corp. 3 ni 9235/9236 safety guidelines operate the ni 9235/9236 only as described in these operating instr u ctions. Hot surface this icon denotes that the component may be hot. To u ching this component may res u lt in bodily inj u ry. Safety guidelines for hazardous location...

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    Ni 9235/9236 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 by iec 60529 and en 60529. Caution for zone 2 applications, connected signals m u st...

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    © national instruments corp. 5 ni 9235/9236 special conditions for marine applications some mod u les are lloyd’s register (lr) type approved for marine applications. To verify lloyd’s register certification, visit ni.Com/certification and search for the lr certificate, or look for the lloyd’s regis...

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    Ni 9235/9236 6 ni.Com connecting the ni 9235/9236 the ni 9235/9236 has a 24-terminal detachable spring-terminal connector that provides connections for 8 analog inp u t channels. Figure 1. Ni 9235/9236 terminal assignments exc0 ai0 rc0 exc2 ai2 rc2 exc4 ai4 rc4 exc6 ai6 rc6 exc1 ai1 rc1 exc3 ai3 rc3...

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    © national instruments corp. 7 ni 9235/9236 yo u can connect a q u arter-bridge sensor to each channel. Each channel has an exc terminal that provides the excitation voltage stim u l u s, an ai terminal that meas u res the bridge voltage, and an rc terminal that provides the q u arter-bridge complet...

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    Ni 9235/9236 8 ni.Com connecting wires to the ni 9235/9236 connector use a flathead screwdriver with a blade smaller than 2.3 × 1.0 mm (0.09 × 0.04 in.) to connect wires to the detachable spring-terminal connector. Insert the screwdriver into a spring clamp activation slot and press a wire into the ...

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    © national instruments corp. 9 ni 9235/9236 wiring for high-vibration applications if an application is s u bject to high vibration, national instr u ments recommends that yo u u se the ni 9965 backshell kit to protect the connections. Refer to fig u re 4 for an ill u stration of the ni 9965 connect...

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    Ni 9235/9236 10 ni.Com ni 9235/9236 circuitry the ni 9235/9236 is isolated from earth gro u nd. However, the individ u al channels are not isolated from each other. The exc terminals all connect internally to a common excitation s u pply. Yo u m u st connect each exc terminal to only one gage to mai...

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    © national instruments corp. 11 ni 9235/9236 figure 5. Input circuitry for one channel of the ni 9235 exc ai rc + – bridge completion re s i s tor filtered differenti a l amplifier 2.0 v bridge excit a tion 120 Ω 50 k Ω sh u nt re s i s tor + – adc ni 9235.

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    Ni 9235/9236 12 ni.Com figure 6. Input circuitry for one channel of the ni 9236 the ni 9235/9236 also incl u des filters to prevent aliasing. The filters on the ni 9235/9236 filter according to the sampling rate. Refer to the understanding ni 9235/9236 filtering section for more information abo u t ...

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    © national instruments corp. 13 ni 9235/9236 q u arter-bridge meas u rements are inherently sensitive to acc u racy degradation d u e to the lead resistance of wiring from the sensor to the meas u rement device. For a given change in the gage resistance, the total effective resistance changes slight...

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    Ni 9235/9236 14 ni.Com sh u nt calibration sim u lates strain inp u t by changing the resistance of an arm in the bridge by a known amo u nt. By sh u nting, or connecting, a large resistor across one arm of the bridge, a specific change occ u rs in the bridge voltage ratio. With the connected sensor...

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    © national instruments corp. 15 ni 9235/9236 understanding ni 9235/9236 filtering the ni 9235/9236 u ses a combination of analog and digital filtering to provide an acc u rate representation of in-band signals while rejecting o u t-of-band signals. The filters discriminate between signals based on t...

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    Ni 9235/9236 16 ni.Com figure 7. Typical passband response for the ni 9235/9236 fre qu ency (khz) 5 4 0.025 0.000 –0.025 –0.050 3 2 1 0 g a in (db).

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    © national instruments corp. 17 ni 9235/9236 stopband the filter significantly atten u ates all signals above the stopband freq u ency. The primary goal of the filter is to prevent aliasing. Therefore, the stopband freq u ency scales precisely with the data rate. The stopband rejection is the minim ...

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    Ni 9235/9236 18 ni.Com the mod u les m u st share a single master timebase so u rce. Refer to the software help for information abo u t config u ring the master timebase so u rce for the ni 9235/9236. Visit ni.Com/info and enter c s erie s doc for information abo u t c series doc u mentation. The fo...

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    © national instruments corp. 19 ni 9235/9236 sleep mode this mod u le s u pports a low-power sleep mode. S u pport for sleep mode at the system level depends on the chassis that the mod u le is pl u gged into. Refer to the chassis man u al for information abo u t s u pport for sleep mode. If the cha...

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    Ni 9235/9236 20 ni.Com specifications the following specifications are typical for the range –40 to 70 °c u nless otherwise noted. The specifications are the same for the ni 9235 and the ni 9236 u nless otherwise noted. Input characteristics n u mber of channels.......................... 8 analog in...

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    © national instruments corp. 21 ni 9235/9236 data rate range ( f s ) u sing internal master timebase minim u m.................................... 794 s/s maxim u m ................................... 10 ks/s data rate range ( f s ) u sing external master timebase minim u m.............................

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    Ni 9235/9236 22 ni.Com acc u racy, ni 9235 stability, ni 9235 gain drift.............................. 6 ppm/°c offset drift............................ 2.2 μ v/v/°c measurement conditions percent of reading * (gain error) percent of range †, ‡ (offset error) 30 days after cal. ( ±5 °c) 1 year after...

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    © national instruments corp. 23 ni 9235/9236 acc u racy, ni 9236 stability, ni 9236 gain drift.............................. 6 ppm/°c offset drift............................ 1.7 μ v/v/°c measurement conditions percent of reading * (gain error) percent of range †, ‡ (offset error) 30 days after cal....

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    Ni 9235/9236 24 ni.Com channel-to-channel matching (calibrated) phase nonlinearity f in = 0 to 1 khz............................ ±0.002° f in = 0 to 4 khz............................ ±0.1° inp u t delay ........................................ 38.2/ f s + 11 μ s passband freq u ency ...................

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    © national instruments corp. 25 ni 9235/9236 alias-free bandwidth ........................ 0.45 · f s oversample rate ................................ 64 · f s rejection at oversample rate 1 (f s = 10 ks/s) ..................................... 80 db @ 640 khz inp u t noise f s = 1 ks/s ni 9235 .......

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    Ni 9235/9236 26 ni.Com crosstalk ( f in = 1 khz) ...................... –100 db common-mode voltage, all signals to earth gro u nd................. ±60 vdc cmrr ( f in = 0 to 60 hz) ni 9235....................................... 120 db ni 9236....................................... 110 db mtbf ........

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    © national instruments corp. 27 ni 9235/9236 shunt calibration characteristics sh u nt calibration acc u racy resistance ni 9235....................................... 50 k Ω ni 9236....................................... 100 k Ω o u tp u t val u e ni 9235....................................... –599...

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    Ni 9235/9236 28 ni.Com excitation characteristics excitation type .................................. Constant voltage excitation val u e ni 9235....................................... 2.0 v ± 1% ni 9236....................................... 3.3 v ± 1% maxim u m o u tp u t c u rrent ni 9235............

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    © national instruments corp. 29 ni 9235/9236 thermal dissipation (at 70 °c) ni 9235 active mode ......................... 735 mw max sleep mode........................... 25 μ w max ni 9236 active mode ......................... 675 mw max sleep mode........................... 25 μ w max physical cha...

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    Ni 9235/9236 30 ni.Com isolation channel-to-channel .................... None channel-to-earth gro u nd contin u o u s ........................... 60 vdc, meas u rement category i withstand ............................. 1,000 v rms , verified by a 5 s dielectric withstand test meas u rement category...

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    © national instruments corp. 31 ni 9235/9236 safety standards this prod u ct is designed to meet the req u irements of the following standards of safety for electrical eq u ipment for meas u rement, control, and laboratory u se: • iec 61010-1, en 61010-1 • ul 61010-1, csa 61010-1 note for ul and oth...

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    Ni 9235/9236 32 ni.Com environmental national instr u ments c series mod u les are intended for indoor u se only b u t may be u sed o u tdoors if installed in a s u itable enclos u re. Refer to the man u al for the chassis yo u are u sing for more information abo u t meeting these specifications. Op...

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    © national instruments corp. 33 ni 9235/9236 shock and vibration to meet these specifications, yo u m u st panel mo u nt the system and u se the ni 9965 backshell to protect the connections. Operating vibration random (iec 60068-2-64)......... 5 g rms , 10 to 500 hz sin u soidal (iec 60068-2-6) .......

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    Ni 9235/9236 34 ni.Com note for emc compliance, operate this device with shielded cabling. Ce compliance this prod u ct meets the essential req u irements of applicable e u ropean directives, as amended for ce markings, as follows: • 2006/95/ec; low-voltage directive (safety) • 2004/108/ec; electrom...

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    © national instruments corp. 35 ni 9235/9236 for additional environmental information, refer to the ni and the environment web page at ni.Com/environment . This page contains the environmental reg u lations and directives with which ni complies, as well as other environmental information not incl u ...

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    Ni 9235/9236 36 ni.Com calibration yo u can obtain the calibration certificate and information abo u t calibration services for the ni 9235/9236 at ni.Com/ calibration . Calibration interval ........................... 1 year where to go for support the national instr u ments web site is yo u r comp...

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    © national instruments corp. 37 ni 9235/9236 and follow the calling instr u ctions or dial 512 795 8248. For telephone s u pport o u tside the united states, contact yo u r local branch office: a u stralia 1800 300 800, a u stria 43 662 457990-0, belgi u m 32 (0) 2 757 0020, brazil 55 11 3262 3599, ...

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    © 2008 national instruments corp. All rights reserved. 374645a-01 jun08 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 co...