Multifunction DAQ

cancel
Showing results for 
Search instead for 
Did you mean: 

Difference between NI 9230 and NI 9234

I plan to purchase one of these modules NI 9230 or NI 9234. Both seem to have similar configurations except the number of inputs (3 and 4 respectively) and sampling frequencies (12.8 kS/s/ch and 51.2 kS/s/ch respectively) and few other minor differences. I need to acquire data from two accelerometers (at around 0.1-2khz) and an impact hammer. Which of these modules would be suitable since the price difference is about INR 1 lakh.

0 Kudos
Message 1 of 3
(2,825 Views)

@krjp wrote:

I need to acquire data from two accelerometers (at around 0.1-2khz) and an impact hammer.


Per Nyquist, if you want to see a 2kHz signal, you have to sample at least 4kHz.  To actually get a good look of the full bandwidth, you really need to be more around 10x the bandwidth.  This would put you around 20kHz sample rate.  Since you have 3 channels, the 9230 will put you at 12.8/3 = 4.27kHz.  The 9234 would give you a max sample rate of 51.2/3 = 17.07kHz.  So I would go with the 9234 and max out that sample rate just so you can get a decent resolution at the 2kHz frequency.


GCentral
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
"Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5
0 Kudos
Message 2 of 3
(2,822 Views)

By my experience on low shock, you will be happy for every sample.

I even quenstion the 2kHz upper bandwidth until proved by measurements with higher bandwidth 😉 

Even at shock durations of 5ms ore longer, you can have significant energy at frequncies beyond 2 kHz.

So I'm with crossrulz...  get the one with higher bandwidth. 

Greetings from Germany
Henrik

LV since v3.1

“ground” is a convenient fantasy

'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'


0 Kudos
Message 3 of 3
(2,798 Views)