Hysteresis and niScope Fetch Measurement.vi

[VI_Joe]

Sometimes I get a pulse width measurement in the order of a few microseconds when I'm expecting 30ms.  I'm wondering if this isn't a result of noise.  I have niScope Fetch Measurement.vi set to measure Positive Width.  From what I understand, the default value of hysteresis is 2 per cent of the Vertical Range setting for the digitizer.  Is there a way to calculate the peak-peak level of noise that will result in a false measurement for a given Vertical Range?  This assumes that the noise appears on the rising edge of the waveform.

Thanks in advance.

[EEsRULEtheWORLD]

Hey VI Joe,

What scope model are you using to make this measurement?  Can you post a screen capture of the signal that you are trying measure? 

How are you using the "niScope Fetch Measurement.vi?"  Is this in an example VI in the Example Finder?  If it is not, try using the niScope Fetch Forever example VI.  Is the same noise experienced when using this example VI?