Somewhat OT Knob & Tube wiring (was Re: Power and the RA82)

[plato computer]

> (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...)

was our tester crawling under a tank?

-----Original Message-----
From: Roger Merchberger <zmerch at 30below.com>
To: "General Discussion: On-Topic and Off-Topic Posts" 
<cctalk at classiccmp.org>
Date: Tue, 12 Jul 2005 15:51:26 -0400
Subject: Re: Somewhat OT Knob & Tube wiring (was Re: Power and the RA82)

> 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:
> 1/sqrt(2)
> 
> (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
>