Paolo,
Look at the power input pins on the transformer. If it was designed for
120/240 volt operation, it should have 2 primary windings. They would
be connected in parallel for 120 VAC operation, and series for 240 VAC
operation. For 240 volt operation, the two center pins of the group of
4 will probably be connected.
No harm would be done if you supply 120 VAC to a meter wired for 240.
However, the other way around would destroy in in an instant.
Deciphering it your self will take a lot less time than trying to find
specs on obsolete components. It may have even been an OEM component
that was re-badged with the microwave meter's manufacturer's name. In
that case, finding any docs would be nearly impossible.
I have boxes of old Analogic DPMs that I can no longer find data for.
They have been relatively easy to figure out. This one should be, as well.
Dave
On 2/11/2016 1:41 PM, Paolo Cravero wrote:
Thank you Dave for the excellent walkthrough procedure.
It was used in a 220 VAC country and the input side of the transformer
looks like it has 4 pins. Looks like...
Anyway, the original device most probably was a General Microwave
Power Meter 475B. The online picture from an auction looks pretty much
like the panel meter I've got.
Off to look for some kind of documentation... it's easier to look up
online during few spare moments than reverse engineer a PCB in a hurry.
Paolo
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