On Dec 13, 2012, at 4:57 AM, Hal Murray <hmur...@megapathdsl.net> wrote: > Suppose I want to compare the PPS outputs of 2 GPS units. The problem is > that I don't know which one will happen first. > > If I feed them into the start/stop inputs of a typical timer/freq box, I > don't know which is which. If I get them wrong, the answer will be > 0.999999xx seconds rather than the -0.000000xx that I want. > > [...] > > Do any of the counter/timer boxes have a mode for this? If so, is there > a buzzword I've overlooked? > Counters like the Agilent 53230 actually WILL output negative delays in this case as long as the delta is still small. This is a quite useful feature in such cases...
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