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Old 5th May 2012, 08:33 PM   #1
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Default Old HP power transformers... need some wiring advice!

Not sure if I'm making a double post now... but here goes:

I managed to salvage some PAECO power transformers from old HP voltage meters. I believe they all come from model 400D from the early 60's. Seems to be high quality ones - shielded and everything.

The thing is I'm not quite sure how to wire them for 230VAC. There are two 115V windings and instructions in the schematic (bottom of the PDF: http://www.mcmlv.org/Archive/TestEquipment/HP400.pdf). Pin 4+6? Or join 4+6 and then connect mains to 2 & 8? I have to admit I'm a little confused

Thanks!
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Old 5th May 2012, 08:42 PM   #2
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Join pins 4 & 6, then connect mains to pins 2 & 8 for 230 volts. This puts the two windings in series.
(remove jumpers from 2 & 4 and 6 & 8)
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Last edited by HollowState; 5th May 2012 at 08:46 PM.
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