What is the min pulse width that can be measured using a 32-bit conter?

what is the min pulse width that can be measured using a 32-bit conter?
and also by chnaging the referenced Clock, can we measure as min as 10ns pulse width?

You could measure a 40ns pulse, but not with a great degree of accuracy. Here's a good document on how counter pulse width measurements are handled:
http://zone.ni.com/devzone/conceptd.nsf/webmain/7C77FB9EDC17C3C386256802007B8AB3
With a 40 ns pulse, you'd have 3 counts per pulse so your uncertainty is pretty high (33%). Another way to look at it would be that you would read either 3 counts or 4 counts which would be values of 37.5ns (3*12.5ns) or 50ns depending on where the rising edges fall. So you wouldn't be able to tell the difference between a 40ns pulse and a 42ns pulse, but you would between a 40ns and a 100ns.
Hope this helps,
Andrew S
National Instruments
Message Edited by stilly32 on 09-18-2006 05:04 PM
Getting Started with NI-DAQmx
Measurement Fundamentals

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