[Boatanchors] Voltage Calibration with 1000 ohm/volt vs 20000 ohm/volt me...

[J. Forster]

If you have a 20,000 ohm/volt meter and need a 1000 ohm/volt meter, why don't
you just put a resistor in parallel with the meter.  For example:

On a 250 Volt scale:

1000 ohm/volt x 250 V =  250 K
20,000 ohm/volt x 250 V = 5,000,000 ohms.

So, what R do you need to parallel a 5,000,000 with to get 250K?

R par = ( R1 x R2 ) / (R1 + R2)  ===>    so   Rpar x (R1 + R2) = R1 x R2

Rpar = 250,000
R1 = 5,000,000

Solve for R2, the resistor you want to put in parallel with the meter.

-John


Flowertime01 at wmconnect.com wrote:

> Hi All
>
> I want to calibrate my TV7-U tester and want to know
> how much of a differance in voltage reading would I
> get using a 1000 ohm/volt mster (called for and dont
> have) vs a simson 260 @ 20000 ohm/volt meter. I have
> seen this a lot with the older receivers also
>
> Mike