Manuale d’uso / di manutenzione del prodotto NI 9234 del fabbricante National Instruments
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OPERATING INSTRUCTIONS AND S PECIFICATIONS NI 9234 4-Channel, ± 5 V, 24-Bit Software-Selectable IEPE and AC/DC Analog Input Module ni.com/manuals Deutsch Français.
NI 9234 Operating I nstruction s and Specificati ons 2n i . c o m This doc u ment describes ho w to u se the National Instr u ments 9 234 and incl u des specif ications and con nector assignments for the NI 9234. V isit 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 Instruments Corp. 3 NI 9234 Operating Instructi ons and Specific ations Safety Guidelines Operate the NI 9234 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 9234 Operating I nstruction s and Specificati ons 4n i . c o m 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 Instruments Corp. 5 NI 9234 Operating Instructi ons and Specific ations Special Conditions fo r Marine Ap plications Some mod u les are Lloyd’ s Register (LR) T ype Approv ed for marine applications. T o verify Llo yd’ s Register cert if ication, visit ni.
NI 9234 Operating I nstruction s and Specificati ons 6n i . c o m Connecting the NI 9234 The NI 9234 has fo u r BNC connectors that pr ovide connections to fo u r sim u ltaneo u sly sampled analog inp u t channels.
© National Instruments Corp. 7 NI 9234 Operating Instructi ons and Specific ations Each channel has a BNC connector to which yo u can connect a signal so u rce. Y o u can also enable excita tion c u rrent on a per-channel basis to connect Integr at ed Electronics Pi ezoelectric (IEPE) sensors.
NI 9234 Operating I nstruction s and Specificati ons 8n i . c o m Refer to Fig u res 2 and 3 for ill u strations of connecting gro u nded and floating signal so u rces to the NI 9234.
© National Instruments Corp. 9 NI 9234 Operating Instructi ons and Specific ations Figure 3. Connecting a Floating Signal Source to the NI 9234 The NI 9234 can also provide an IEPE excitation c u rr ent for ea ch channel to meas u re gr o u nd-referenced or floati ng IEPE sensors.
NI 9234 Operating I nstruction s and Specificati ons 10 ni.com NI 9234 Circuitr y The NI 9234 analog inp u t channels are referenced to chass is gro u nd thro u gh a 50 Ω resistor . T o minimize gro u nd noise, make s u re the chassis gro u nd is connected to earth gro u nd.
© National Instruments Corp. 11 NI 9234 O perating In structions and Specificat ions Figure 4. NI 9234 Input Cir cuitr y for One Channel The NI 9234 u ses common-mode bias c u rrent to bias the c u rrent-limiting diodes when IEPE c u rrent is t u rned off.
NI 9234 Operating I nstruction s and Specificati ons 12 ni.com Figure 5. Measurement Error Introduced by Common-Mode Bias Current The NI 9234 also has TEDS circ u itry .
© National Instruments Corp. 13 NI 9234 O perating In structions and Specificat ions Understanding NI 9234 Filtering The NI 9234 u ses a combination of anal og and digita l f iltering to provide an acc u rate representation of in-band signals whi le rejecting o u t-of-band signals.
NI 9234 Operating I nstruction s and Specificati ons 14 ni.com Figure 6. NI 9234 T ypical Passband Flatness F requency/Data Rate 0.5 0.4 0.025 0.000 –0.
© National Instruments Corp. 15 NI 9234 O perating In structions and Specificat ions Stopband The filter signif icantly atten u ates all signals abo ve the stop band freq u ency . The primary goal of the fi lter is to pre vent aliasing. Therefore, the stopband freq u ency scales precisel y with the data rate.
NI 9234 Operating I nstruction s and Specificati ons 16 ni.com Understanding NI 9234 Data Rates The freq u ency of a ma ster timebase ( f M ) controls the data rate ( f s ) of the NI 9234. The NI 9234 incl u des an int ernal master timebase with a freq u ency of 13.
© National Instruments Corp. 17 NI 9234 O perating In structions and Specificat ions of 13.1072 MHz, the res u lt is da ta rates of 51.2 kS/s, 25.6 kS/s, 17.067 kS/s, and so on do wn to 1. 652 kS/s, depending on the v al u e of n . When u sing an external timebase with a fre q u ency other than 13.
NI 9234 Operating I nstruction s and Specificati ons 18 ni.com Specifications The follo wing specif ications are typical for the rang e – 40 to 70 °C u nless otherwise noted. Input Characteristics N u mber of channels .................. ........ 4 a nalog inp u t channels ADC resol u tion .
© National Instruments Corp. 19 NI 9234 O perating In structions and Specificat ions Data rate range ( f s ) u sing external master timebase Minim u m ...................... ......... ..... 0.391 kS/s Maxim u m ....................... ............ 52.
NI 9234 Operating I nstruction s and Specificati ons 20 ni.com AC c u tof f freq u ency response F requency (Hz) 10 4 0.5 0.0 –0.5 –1.0 3 2 1 09 8 7 6 5 Gain (dB).
© National Instruments Corp. 21 NI 9234 O perating In structions and Specificat ions Inp u t range ...... ........ ............ ........... ... ±5 V AC v o l t a g e f u ll-scale range Minim u m .. ........ ............ ......... ..... ±5 V pk T ypi cal .
NI 9234 Operating I nstruction s and Specificati ons 22 ni.com IEPE compliance voltage .......... ........ 19 V ma x If yo u are u sing an IEPE sensor , u se the following eq u ation to make s u re yo u r config u ration meets the IEPE compliance v oltage range.
© National Instruments Corp. 23 NI 9234 O perating In structions and Specificat ions Acc u racy 1 1 Refer to the NI 9234 Circuitry section for informat ion regarding gro u nded signal so u rces and meas u rement acc u racy .
NI 9234 Operating I nstruction s and Specificati ons 24 ni.com Gain drift T ypi cal . ........... ......... ........... ........ 0.14 mdB/°C (16 ppm/° C) Maxim u m ......... ............ ........... ... 0.45 mdB/°C (52 ppm/°C) Offset drift T ypi cal .
© National Instruments Corp. 25 NI 9234 O perating In structions and Specificat ions Alias-free bandwidth ..... ......... .......... 0.45 · f s Oversample rate ......... ........... ......... ... 64 · f s Crosstalk (1 kHz) ........... ......... ...
NI 9234 Operating I nstruction s and Specificati ons 26 ni.com T otal harmonic distortion (THD) Intermod u lation distortion (–1 dBFS) DIN 250 Hz/8 kHz 4:1 amplit u de ratio ......... ............ –80 dB CCIF 11 kHz/12 kHz 1:1 amplit u de ratio ..
© National Instruments Corp. 27 NI 9234 O perating In structions and Specificat ions Power Requirements Power cons u mption fr om chassis Activ e mode .............. ............ ..... 900 mW max Sleep mode .......... ......... ........... ... 25 μ W max Thermal dissipation (at 70 °C) Active mode .
NI 9234 Operating I nstruction s and Specificati ons 28 ni.com Safety Safety Voltages Connect only v oltages that are within the follo wing limits. Channel-to-earth gro u nd .............. ..... ±30 V max, Meas u rement Category I Isolation Channel-to-channel .
© National Instruments Corp. 29 NI 9234 O perating In structions and Specificat ions Hazardous Locations U.S. (UL) .......... ......... ........... ......... ... Class I, Division 2, Gro u ps A, B, C, D, T4; Class I, Zone 2, AEx nA IIC T4 Canada (C-UL) .
NI 9234 Operating I nstruction s and Specificati ons 30 ni.com Electromagnetic Compatibility This prod u ct meets the req u irements of the follo wing EMC standards for electrical eq u ipment for meas.
© National Instruments Corp. 31 NI 9234 O perating In structions and Specificat ions CE Compliance This prod u ct meets the essent ial req u irem ents of app licable E u ropean Directi ves as follows.
NI 9234 Operating I nstruction s and Specificati ons 32 ni.com Shock and Vibration T o meet these 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 Instruments Corp. 33 NI 9234 O perating In structions and Specificat ions Operating h u midity (IEC 60068-2-56)....... ........... ............ 10 to 90% RH, noncondensing Storage h u midity (IEC 60068-2-56)....... ........... ............
NI 9234 Operating I nstruction s and Specificati ons 34 ni.com Waste Electrical and Electronic Equipment (WEEE) EU Customers At t he end of their lif e cycl e, 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 Instruments Corp. 35 NI 9234 O perating In structions and Specificat ions 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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