[AMRadio] Component ID please


John Coleman ARS WA5BXO wa5bxo2006 at pctechref.com
Mon Dec 11 23:36:07 EST 2006


	Well then that proves that the movement is indeed a 1ma movement.
Now you need to remove the 500K ohm if you are going to be using it with an
external 5Meg else you will be 10 percent off in measurments.  You could
also leave the 500K inside, and replace the external 5 meg with a 4.5 meg.

	The total resistance needs to be 5 meg to use a multiplier of 10 on
the scale. 

	If you leave the total resistance a 5.5 meg (5 meg +500K) then you
will need to multiply the meter reading by 11 instead of just 10. That's too
difficult. 

	If you want a full scale reading of 2KV (multiply the scale by 4)
then the total resistance should be 2 MEG.

John

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jack Schmidling
Sent: Monday, December 11, 2006 9:55 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Component ID please

John E. Coleman (ARS WA5BXO) wrote:
> Jack,
>  Check the meter with another meter and see if it is reading 1ma and is
> accurate enough. 

Actually, with the new 500k in the meter, it reads 10v with 10v in. 
Couldn't think of anything with a higher DC voltage to calibrate with 
but at least is is functioning and in the ball park.

js

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