[time-nuts] Need to measure frequencies of two sources simultaneously

[Bob Albert]

If the two frequencies are near one another you can measure the difference frequency, which may or may not be helpful.

I know of no counter that can count two signals; that would require two registers.  Use two counters with synchronized time bases.


Bob




On Tuesday, October 22, 2013 9:15 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
 
We have two sources and we want to be able to measure their
frequencies at the same time.  We want to get a time record
of frequency each second.  Apparently, what is meant
by a "two channel" frequency counter is that you get the
frequency of either channel A or channel B but not both
at once.  Some can also measure the ratio of A to B, but
that doesn't work for us.

We seem to be left with using a separate counter for each
source and doing data logging with time stamping.  We can then 
reconstruct the two frequency records after the fact in a spread sheet.
There is the problem of synchronizing the time stamping
clocks in the two counters.

Can anyone on the list point me to a true two channel
counter that would just measure the two sources?  We are
working around 200 MHz, but could possibly prescale.


Thanks

Rick Karlquist N6RK

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