Hi, Sheldon

There's no sample period !

just some µs @the beginning of the command to preset the trigger conditions, and some µs after the end of measure to check end of signal and transfer the result to the variable you've chosen.

I must suppose your question was ... " which is the minimum period pulsin can measure " or " which is the maximum frequency for pulsin use "

please try to explain better what you try or intend to do

Alain