Acquiring transient signals

[david1 145]

Dear Labview Experts

I would like to know what is the best method to acquire some transient signals (5ms period an 2Vpp). I was trying to use AI Acquire waveform VI and scanning continuously for 3 sec (in order not to miss the signal). However when I try to get that signal within that period of time I can not see it !. When I connect a direct signal from the function generator 2Vpp 5Khz there is no problem getting that signal. I have a guts feeling that I should use the trigger VI module.

Any suggestions?

Thanks in advance for any advice

David1

[Mike Manzheliy]

Hi David,
do you see a constant signal, I mean 10v?
If yes, than I think your signal grounding isn't right.
Please check it
Mike

david1 wrote:

> Dear Labview Experts
>
> I would like to know what is the best method to acquire some transient
> signals (5ms period an 2Vpp). I was trying to use AI Acquire waveform
> VI and scanning continuously for 3 sec (in order not to miss the
> signal). However when I try to get that signal within that period of
> time I can not see it !. When I connect a direct signal from the
> function generator 2Vpp 5Khz there is no problem getting that signal.
> I have a guts feeling that I should use the trigger VI module.
>
> Any suggestions?
>
> Thanks in advance for any advice
>
> David1

[david1 145]

Hello Mike

Thanks for your prompt reply; I forgot to say that before I try to get this transient signal I monitor first the background level of the input signal which is almost zero then probably there is not an offset 10V signal. Because when I try to monitor this transient signal I can see the background level but no the real signal.

Today trying again to solve this problem I notice that this transient signal is there but some time is out of the window where I want to have it.

Thanks again for your advice

David