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 <rich...@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.