[time-nuts] Troubleshooting Fluke PM6681

[Magnus Danielson]

Great news! :)

Cheers,
Magnus

On 08/17/2015 09:33 AM, Ole Petter Ronningen wrote:
> Fantastic, just what I needed. Thank you!
>
> On Sun, Aug 16, 2015 at 9:16 PM, Magnus Danielson <
> magnus at rubidium.dyndns.org> wrote:
>
>> Ole,
>>
>> I checked with a former Pendulum employee, and free off memory, he
>> recommend trimming up the 100 MHz until Error 2 does not show. Sensing it
>> directly can be difficult, FET-probe essentially mandatory. Indirectly a 10
>> MHz is possible. A problem is that trimming with the hood off causes a
>> different thermal setup than when the hood is on. If you dare, make a hole
>> in the hood so that you can trim it with the hood on, that is what they did.
>>
>> CMOS backup battery eventually fails, and then you need to replace it and
>> re-calibrate it. I have the details jotted down, but it seems that this is
>> not your issue.
>>
>> Cheers,
>> Magnus
>>
>>
>> On 08/16/2015 12:20 PM, Ole Petter Ronningen wrote:
>>
>>> Hello.
>>>
>>> I have a Fluke PM6681 that has issues. When I got it, it gave results all
>>> over the place, but after adjusting the 100Mhz multiplier-chain, it seems
>>> to be much better; at least I get std.deviationwell within spec using a
>>> split pulse to input A and B, 100 samples. I'd like to get it
>>> professionally calibrated, but I don't want to send it in with known
>>> issues
>>> - the cost of calibration will not be refunded if the instrument can not
>>> be
>>> calibrated, and I believe it is no longer repairable.
>>>
>>> So, the issue is that it fails the ASIC test (test 6), with err 2.The
>>> service-guide lists a number of signals to be checked in test-mode, but I
>>> am not able to see any of them. Since the counter seems to function, I can
>>> only conclude that the signals are not present due to this error.. (Or
>>> that
>>> I am mistreading the guide and looking in the wrong place, probably at
>>> least as likely..)
>>>
>>> Anyway, I cant seem to find a description of this particular error, does
>>> anyone know what it means?
>>>
>>> Thanks,
>>> Ole
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