[GTALUG] mysterious restarts

[Alvin Starr]

On 06/22/2016 01:25 PM, Jamon Camisso via talk wrote:
> On 2016-06-22 17:46, D. Hugh Redelmeier via talk wrote:
>> Remember, he truncated the values (grep does not round).
>>
>> My best guess:  the average of the readings would be from a
>> distribution centred on 59.996435 (0.005 larger than Lennart
>> calculated).  It could be as low as 59.991435 or as high as 60.991434,
>> assuming six digits of precision in the fraction.  I know nothing
>> about accuracy of the device.
>>
>> Summary: the 60Hz hypothesis is not excluded by the evidence.  Far
>> from it.
>>
>> P.S. "grep -c" eliminates the need for "wc -l".
> and sort/uniq eliminate even more:
>
> cat /tmp/MGC|sort -n |uniq -c
>   16 FREQ value 59.95
>   99 FREQ value 59.96
>  282 FREQ value 59.97
>  464 FREQ value 59.98
>  459 FREQ value 59.99
>  385 FREQ value 60.00
>  302 FREQ value 60.01
>  144 FREQ value 60.02
>   68 FREQ value 60.03
>    3 FREQ value 60.04
> ---
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Another question is how accurate is the device doing the measurements.
If this is a UPS then the monitoring is not designed for accurate
frequency measurements.
Get out your 6+ digit frequency counter and then run the tests.


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Alvin Starr                   ||   voice: (905)513-7688
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