> Thanks for clarifying this issue! I may use references with close-in PN > (1Hz-1kHz) 10 dB noisier than the DUT, however as you said it may > require an overnight run for 1 Hz offset, which isn't the nice part... I > assume then that speeding up the measurement process can only be > obtained using references sources at least quieter than the DUT.
A 10-dB deficit may not be too bad, since the performance improvement isn't linear with time. If your instrument takes 8 hours to drop the measurement floor by 20 dB, for instance, it will only take 4 hours to achieve 18.5 dB of improvement, or 2 hours for 17 dB. So if each of the references is 10 dB noisier than the DUT, their effect will be mostly gone after 2 hours. -- john, KE5FX Miles Design LLC _______________________________________________ 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.
