Hello,
I would like to calculate the uncertainty of a measurement using a counter (pulseweight measurement or period).
I'm reading N samples and sum them at the end to know my total test time. I supposed in this way my uncertainty must be high (Uncertainty times N samples ...).
This is why I'm looking for several information I didn't find on the NI website.
1) The counter resolution is 32 bits, but what is its range voltage input ? I would like to know the minimum timing change detectable.
2) How can I know the accuracy in % of the measure time ? 50 ppm on a 80 MHz clock ok, but there must have a relation with the measured time too no ?
3) What is the clock deviation in time ? (calibration will be necessary but it's to have an idea)
4) I saw a numeric filter in my channel settings too, but I don't know how it's supposed to work and what can be the impact on the uncertainty of my measurement ?
Thank you all in advance 