Somewhat OT Knob & Tube wiring (was Re: Power and the RA82)
zmerch at 30below.com
Tue Jul 12 14:51:26 CDT 2005
Rumor has it that Vintage Computer Festival may have mentioned these words:
>On Tue, 12 Jul 2005, Curt @ Atari Museum wrote:
> > Still burns and leaves the God-awefullest metal taste in your mouth when
> > you get hit with a ring surge, You sure its AC? Doesn't make sense,
> > but voltage on my meter would jump up from 48-52vdc to around 78-80vdc
> > on the DVM
>Yes, it's AC. That's why it hurts. DC would feel strange perhaps but not
>like AC. The reason you saw voltage at 80VDC is because your digital
>meter samples slowly.
Or -- some meters when set to DC and fed AC will measure the RMS [kinda
DC-equivalent value] voltage of the AC...
100+V AC * .707 = 70+V DC.
The equation for figuring RMS voltage on sine-wave AC is:
(I've seen up to 110V AC myself [more on hand-cranked military handsets],
so that would get awfully close to the 80V the OP saw...)
Just a thought,
Roger "Merch" Merchberger
Roger "Merch" Merchberger | Anarchy doesn't scale well. -- Me
zmerch at 30below.com. |
SysAdmin, Iceberg Computers
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