Re: [CAD_CAM_EDM_DRO] panel meters

On Tue, 9 Mar 2004 14:27:45 EST, you wrote:

>In a message dated 3/9/2004 11:12:15 AM Central Standard Time,
>johnatl@... writes:
>Connect the meter
>across the 1 000 ohm resistor. The voltage displayed will be 1/1000 the
>input, i.e. 200V in will put 200mV across the meter.
>
>As far as current, you'll need a very low resistance, precision
>resistor to put in series with your power supply and load. Scaling is
>similar to above. E.g. You have a 0-200mV meter, and you want to
>monitor 0-20A. So, we know we want 200mV out for 20A current, so:
>.200
>In what galaxy???

You buy a shunt, rated for that current, and that voltage drop. May
or may not be readily available, but they do exist. It's common
practice in higher current meters to have an external shunt, rather
than route 200 amps through the meter body.

Harvey