[time-nuts] SR620 binary dump
Volker Esper
ailer2 at t-online.de
Sat Mar 8 21:29:13 EST 2014
...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
>
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