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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