ni DMM 4072

[VKP]

Hi

I am unable to acquire 2.5 msec pulse using NI DMM 4072. I am using niDMM Configure Waveform Acquisition , niDMM Read Waveform VI's. After configure start DMM to read wavefrom ( while DMM in acquire mode) I activate a relay ( simulates a button press) using Switch executive VI , while I see the pulse at Oscilloscope but unable to see same pulse at waveform graph window.

Any ideas ?

thanks Vinod

[Norbert_B]

I think that you are better of with a triggered acquisition. My assumption is that your singal is either not yet available when you acquire the requested number of samples or (more likely) you acquire data right away and close the route too late.

Your acquisition time is 5000/1.8M s = 2.7 ms following your default values. Is this what you really need?

Norbert

[vki]

I am not using default selection values , tried acquisition time even upto 5 seconds. When I run in highlight option can see acquisition finishes after closure of switch. So not sure what could be the reason?

[Norbert_B]

Highlight mode is incorrect here. Highlight mode serializes the whole execution hence only one subVI can execute at a time. So reading the DMM cannot execute in parallel to closing the route.

What do you mean by "I am no using default selection values"?

Norbert

[VKP]

Hi , Increasing delay to 500msec before read waveform resolved the issue. Total read period is 2sec , 20,000 points/10,000 S/s