> 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
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