Looking for a circuit diagram/manual for NTP 177-880A PPM

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Thanks! I think (=hope) the 80A means it is a meter in a table top enclosure.
I get it today to repair. The problem is that the display gets crazy after a couple of minutes.
Might be a supply voltage issue, had this problem before.
I have a 177-800 here, so it might be possible to exchange sub-boards to check things.
 
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