measuring a high current

[satriany]

Hello Every body,

i try to measure a high current in a very short period of time with a
DAQ-Assistent but i have a problem with  triggering the signal to be 
able to measure this high current about( 2KA or 3 KA) in microsendes.
i use a resistance to measure the current as voltage and i connected 
the wire to analog input Dev1/ai0
my device is PXI-6259
i have labview 7.1

i tested this VI with a function generator connected to the analog input 
and it works but with my signal which is very short  ( in microsendes ) it didn't trigger

could you please support me with the best way to prgramm this 
application 
is it right what i did in this DAQ or there is another way to achieve 
this function ? 

 thank you very much
Satriany

[Andre_Saller]

Hello Satriany,

in your DAQ Express Block, you haven´t configured any Trigger-Type, or at least I don´t see it, when I open the VI. You can configure a Analog Trigger, increase the sample rate, so that the Hardware satrts measuring, when the Input-Signal crosses a user-defined voltage-level. I changed your VI accordingly. You have to set the right Trigger Level (you can do this in the DAQ-Assistant Express Block in the "Task-Triggering" tab), as I don´t know how your signal looks like.

Hope this helps!