I also
'megger' them
(does that make senze across the Pond? A 'Megger' over here is a
megohmeter that uses a high test voltage (perhaps 1000V) to detect
insualtion breakdown).
Yes. The term applies here as well.
Actually, 'Megger' is a brand name that's become somewhat generic (like
'Hoover' for vaccum cleaner). The original Meggers had a hand-crancked
magneto generator to get the high voltage.
I have one of those, but I tend to use another insulation tester that has
a transistorised oscillator and transformer circuit. That one has
selectable test voltages which can be useful.
My Victor Comptometer* is marked 100-130VAC on the bottom, so I'm OK there.
-ethan
* for the curious, it's a model 12E.523.157C, whatever that means. I
just dismantled the Bakelite plug housing and what I need is similar
to what we have been discussing, but not identical. I have three
round fat (4.5mm?) brass pins in a similar high-middle-low
arrangement, sticking out of the back of the machine. They appear to
be in the pattern N-G-H, based on which one is fused. Every time I
I am not sure what the wiring on the HP9125 is, but it'll be trivial to
work it out.
look at the nameplate, I think of the line from
"Are You Being Served"
where the wife of a couple shopping at the store accuses her
accountant husband of infidelity with "... the girl on the
comptometer. It all adds up!"
This reminds me of a somewhat strange thing I have made by Victor
Comptometer. It came off some scientific instrument (maybe X-ray
diffraction) and is a numerical printer. It consists of the mechanism of
a comptometer (I am not sure how complete it is, there my be no carry
linkages, for example) with solenoids over where the keys would be, and a
metal box over them. I am not sure what I'll ever use it for, but it
seemed to be worth saving.
-tony