...I'll try that, too. Tomorrow. Volker Am 09.03.2014 00:29, schrieb Tom Van Baak: >> Using XREL exposes an additional digit of resolution. Set XREL to 1E7 and >> then you get ascii readings like: >> >> 1.E-4 >> -6.E-5 >> 2.E-4 >> -1.4E-4 >> .0E-6 >> -1.9E-4 > I should clarify. Yes, it appears that when using XREL, one can get ~2.7 ps > timing resolution/granularity for frequency readings <10 MHz. But when the > frequency reading is >10 MHz the timing resolution/granularity is 10 ps. > > For example, here are 1000 measurements using XREL 1E7 (columns are > occurrence, value): > > 1 9999999.999480 > 1 9999999.999510 > 1 9999999.999560 > 1 9999999.999590 > 4 9999999.999620 > 3 9999999.999640 > 9 9999999.999670 > 6 9999999.999700 > 8 9999999.999720 > 22 9999999.999750 > 24 9999999.999780 > 28 9999999.999810 > 50 9999999.999830 > 71 9999999.999860 > 45 9999999.999890 > 73 9999999.999910 > 122 9999999.999940 > 54 9999999.999970 > 294 10000000.000000 > 152 10000000.000100 > 28 10000000.000200 > 2 10000000.000300 > 1 10000000.000500 > > Notice how all the readings less than 10 MHz differ by 20 or 30 uHz (mean > 27), but all the readings greater than 10 MHz differ by 100 MHz. I will > continue to look into this, but my hunch is that this is a bug in the SR620 > firmware; the only solution is using binary mode. > > /tvb > > _______________________________________________ > 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.
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