Lux, Jim (337C) wrote: > >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On >> Behalf Of Bruce Griffiths >> >> If the 2 signals are sampled at different times then there is >> incomplete >> cancellation of the phase noise of the offset oscillator. >> This effect increases with the delay between the 2 samples. >> In practice the interchannel sampling delay can be relatively long >> (hundreds of microsec) with a low noise offset oscillator. >> > > > Since the lowest sample rate contemplated (except for my $25 DATAQ) is 44 > kHz, that's 20-25 microseconds maximum offset, even if you use different > digitizers, once you've figured out the alignment (which you could do with a > single sync pulse fed to all channels) > > > You still need to use the same master clock for both channels to ensure that the phase noise contributed by this sampling clocks largely cancel.
Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
