Voltage threshold selector / discriminator in labview.

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Spoiler

I have a NI pCI 6024e daq card which im usinf with labview 2010 and daqmx. 

I have a system which outputs pulses which i have to count using my counter. 


But the signal has noise in the sense that alongside the REAL pulses (which i have to count) there are some small voltage  pulses as well. 

The issue is that when i try to count the pulses using the counter in my daq card it also counts the low voltage pulses and therefore gives a false reading. 

How can i specify a voltage level threshold (like a discriminator) so that only the pulses above a specific  voltage level are counted. 
Any help would be much appreciated 

[santo_13 · Accepted solution]

Voltage thresholds for counter input are fixed and documented in the datasheet.

You need to use external circuit to achieve adjustable threshold. One way is to use a OPAMP or Comparator in the path of the signal and set the threshold value using a potentiometer or make it programmable using one of the AO channels.

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Thanks alot