Electronics > Metrology

Yokogawa 2558 AC Voltage standard Service Manual?

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Zermalmer:
Hi,
I search for the service manual of the 2558

Looks like it is also a kind of the lost manuals  :palm:

dl1640:
what is wrong with your 2558?

Zermalmer:
Hi,
I wanted to check the adjustment procedure, because the device slowly drifting out of specification.
I think I have to adjust it next year.
Also the 100mV and 1V range are unstable or they where without function. (Can't actually remember).
In this case the not working ranges are not a problem, because the user of the device didn't need them.
But if I go for an adjustment I also want to check if I can fix this two ranges.

add:and the red LED for the state of the output is flickering/stop to light from time to time while switching rotary switch.

Best regards
Andreas

dl1640:
instability may caused by relays in output section, please try to clean or replace them

Zermalmer:
Thanks.
Schematics (if they are in the SM) naturally would make it a little bit easier to search and identify locations in the device.

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