[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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