Re: [TCML] Panel Meters

["DC Cox" <resonance@xxxxxxxxxxxx>]

They don't have to withstand any high voltage.  That's what the divider or
series hi-meg resistors do.  With the anti-parallel diodes the max voltage
across the meter is less than 10 Volts.

In summary, the DC mA meter, when used in series with a high-meg value
resistor, is shorting the HV to ground thru the meter movement.  Under these
short circuit conditions, with a current limiting xmfr such as a nst, there
is no voltage rise due to the short.  only a few Volts develop across the
meter.

Any standard DC mA meter works fine --- use diodes for rectification or use
an AC mA meter.

Dr. Resonance




On Wed, Jun 25, 2008 at 7:49 PM, Phillip Slawinski <pslawinski@xxxxxxxxx>
wrote:

> Will these current meters withstand several kV?
>
> On Wed, Jun 25, 2008 at 8:18 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
>
> > And yes, shunts can be home-brewed easily. I did this with a couple
> meters
> > that required external shunts. I used thin brass sheets and drilled two
> > holes to match the meter bolts. I then used scissors to cut out the
> shunts.
> > I measured current with a digital meter on a load and then hooked up the
> > meter with the homebrew shunt and cut and filed away at the strip of
> brass
> > sheeting until the current matched the meter. Pretty easy to do.
> >
> > Take care,
> > Bart
> >
> >
> > William Noble wrote:
> >
> >> I have a pile in my garage - if you can make your own shunts/dividers I
> >> may be able to help - contact me off the list> Date: Tue, 24 Jun 2008
> >> 23:53:28 -0500> From: pslawinski@xxxxxxxxx> To: tesla@xxxxxxxxxx> CC: >
> >> Subject: [TCML] Panel Meters> > Does anyone know a good source for
> >> [analogue] panel meters?>
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