Converting a $3 / 30v Voltmeter to A 45 v Voltmeter.

The impedance is 100k Ω. Put a 50 kΩ resister in series with the voltmeter and map out the correction.

On Wed, 06 Apr 2022 02:42:21 +0100, Bret Cahill <bretcahill@aol.com> wrote:

> The impedance is 100k &Omega;. Put a 50 k&Omega; resister in series with the voltmeter and map out the correction.

I never would have thought of that.  You should get a Nobel prize!

On 4/5/2022 11:07 PM, Commander Kinsey wrote:
> On Wed, 06 Apr 2022 02:42:21 +0100, Bret Cahill <bretcahill@aol.com> 
> wrote:
>
>> The impedance is 100k &Omega;. Put a 50 k&Omega; resister in series with the 
>> voltmeter and map out the correction.
>
> I never would have thought of that.&nbsp; You should get a Nobel prize!

 &nbsp;I guess, They did give one to the guy that invented the knock knock joke!

BTW, I invented that idea 51 years ago when I built a voltmeter. Oh 
wait, maybe
that whole idea was in the text book for my 11th grade electronics class.
Let's see Basic Electricity Third Edition Paul Zbar, Copyright 1956. 
Hmm, must have been
a decent teaching book as we got new copies in 1972, so it was around a 
long time.
 &nbsp; Oh geez, it wasn't me or Paul, Jacques-Ars&egrave;ne d'Arsonval and Marcel 
Deprez
developed a meter with a stationary permanent magnet and a moving wire coil
in 1882. I'll bet it didn't take them long to figure out how stop the 
meter from pegging. :-)

 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Mikek

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Not as easy as it sounds if you don't have a 40k =CE=A9 resistor.=20

Solution:

Put _two_ voltmeters in series!

It werks up to 32.8 volts.

They LIED to me.

I just had a few shots of the good stuff and am feelin adventurous wif a fire extinguisher.

I gonna see how fur I kin git!

On Sat, 16 Apr 2022 04:08:58 +0100, Bret Cahill <bretcahill@aol.com> wrote:

> It werks up to 32.8 volts.
>
> They LIED to me.
>
> I just had a few shots of the good stuff and am feelin adventurous wif a fire extinguisher.
>
> I gonna see how fur I kin git!

Don't drink all the shots.  Sparks can ignite it for great fun.

On Sat, 16 Apr 2022 04:05:47 +0100, Bret Cahill <bretcahill@aol.com> wro=
te:

> Not as easy as it sounds if you don't have a 40k =CE=A9 resistor.
>
> Solution:
>
> Put _two_ voltmeters in series!

An excellent money saving idea!