[time-nuts] Troubleshooting Fluke PM6681
Ole Petter Ronningen
opronningen at gmail.com
Mon Aug 17 03:33:59 EDT 2015
Fantastic, just what I needed. Thank you!
On Sun, Aug 16, 2015 at 9:16 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:
> 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.
> On 08/16/2015 12:20 PM, Ole Petter Ronningen wrote:
>> 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
>> - the cost of calibration will not be refunded if the instrument can not
>> 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
>> 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?
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