If anyone out there is still trying to use one of these Watt / Volt Meters:
Very Old Westinghouse Wattmeter
You might want the instructions. I’ve scanned and uploaded them here, if you want a print size scanned copy e-mail me and I’d be happy to mail it to you. Then go buy yourself a clamp on multimeter unless you’re using this in a black and white movie 🙂
Westinghouse PY-5 Portable Single Phase Wattmeter Instructions / Parts List
I have one of these that I got a a ham radio fleamarket (hamfest). I am confused as to how to apply the potential. I dont know if 100vac is applied using a variac, or is the 120v mains voltage applied direct? I assume that the 100v terminal would require one to read the 5 kw scale as apposed to the 25 kw scale. Instructions would be nice.
Regards
The instructions I posted in that picture are all I have, I haven’t tried hooking this one up but I had hooked up a different meter with 100V terminals to 120V previously and it was fine, YMMV 🙂