Re: [CAD_CAM_EDM_DRO] panel meters

That's what I said, perhaps not clearly enough:
-----%<------
Most of the meters you encounter will be 0-200mvDC, so you'll need some
precision resistors to divide down your input voltage, for example, 900
000, 90 000, 9 000 ohms and 1 000 ohms in series. 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.
----->%-----

+ term -----900 000----90 000----9 000------1 000----- gnd term

The meter goes across the 1 000 ohm resistor.

-----%<------
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
------
20

Which would be a 0.01 ohm resistor. (such as Digikey # 15FR010-ND) So
you would put the resistor in series with the supply and load, and
connect the meter across the resistor. Negative on the meter goes to
the more negative side of the resistor.
----->%----

load ----- 0.01 ------ power supply
with the meter across the 0.01 resistor.

Regards,
JJ

On Tuesday, Mar 9, 2004, at 18:59 US/Eastern, wanliker@... wrote:

> In a message dated 3/9/2004 12:31:18 PM Mountain Standard Time,
> JanRwl@... 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.
> Excuse me, in parallel they will have the same voltage. I think you
> meant in
> series
> .
> In a meter circuit for measuring voltage the resistor in series drops
> the
> voltage the meter sees. and is usually a fairly "large" value.
> For measuring current a resistor "shunt" is placed in parallel with the
> meter, and is usually a very small value. Sometimes in the shape of a
> flat piece
> of metal, or heavy wire. Trim away metal from the sides until the
> meter is
> calibrated
> bill
>
>
> [Non-text portions of this message have been removed]
>
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