Re: Merc-o-Tronic 172 Peak Kilovolt meter – History?

[legendre]

I took a moment to test it out, and it seems to be in working order. Using a pair of 9V batteries for power, the 6V, 60V and 600V scales respond roughly as expected with a 10V (DC) input to the PV jacks. The "set" knob also zeroes the meter, as it should.

Presently, the working assumption is that PV = Primary Voltage and KV = Kilovolt (Secondary) Voltage.. which if correct would mean they were very loose with their ‘standard’ nomenclature.

One thing really doesn’t make sense, though. Take a look at the back side of the panel.. both sets of jacks are wired in parallel! They’re swapped for polarity / phase, but otherwise, they are hard-wired together. Why would they need to do that?

ETA: No replies of this writing. Not surprising, as the Google doesn’t know anything about the mdl. 172. There are references to other Merc-o-Tronic instruments, but they concern a tachometer or two, and a couple other basic instruments.

Otherwise, it’s like the 172 never even existed.. 😉