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Moes

Can i measure a 10ms Pulse cDaq-9178 & NI9237

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Hello everyone,

i would like to use a stain gauge weighcell (wheatstone bridge, 1~2mV/V, 350Ohms) on my hardware to capture a pulse that is 20ms to 5ms  long

 

Is it possible to reach such low timeframes with labview running on my windows pc?

I know an average of 10ms is not much for measurement systems but mine is more a dataquisition..

 

 

My Hardware:

cDaq 9178

SLOT 3: NI 9237 Staingauge Input

SLOT 6: NI 9425 Digital in from a 24V Lightbar

 

Labview 2017 Student Edition

Edited by Moes

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Assuming your pulse is a pulse on the strain gauge itself and not the lightbar, the specifications of the hardware you selected should be capable of capturing a pulse in that range.  I would recommend taking buffered measurements with a Windows system.  If you need to react to this pulse as it occurs, you may need a real-time system instead.

The NI 9237 can capture at 50 kS/s (or 20 us per sample) - http://www.ni.com/pdf/manuals/374186a_02.pdf.  This is more than enough to detect your pulse without aliasing (>2 times the frequency) and to give a decently accurate representation of the signal (>10 times the frequency - http://www.ni.com/white-paper/13655/en/).

The NI 9425 is less clear, but it appears to be able to measure down to 8 us per sample - http://www.ni.com/pdf/manuals/373782b_02.pdf.  However it may not be capable of buffered measurement (https://forums.ni.com/t5/Digital-I-O/Can-NI-9425-DI-be-buffered/td-p/3368527).

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Help:

 

I have digital in module: DI 9425 and i would like to use it as trigger source, start with "DAQmx" rising edge but it is not working :-/ always says wrong description.

In my german labview version it just says the 9425 was not chosen right (which input and so on)..

 

Is it possible that the 9425 digital in can't be used as a trigger for a daqmx task?

Edited by Moes
Another question popped up Digital In 9425 as Trigger Source!

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