[Boatanchors] DC Voltmeter Calibration

[hwhall at compuserve.com]

This is similar to what Mark Twain said about a man with more than one watch not knowing what time it really was. Without an absolutely reliable standard, who knows which meter is nearest to right?
 

 Wayne
WB4OGM

 

-----Original Message-----
From: D C _Mac_ Macdonald <k2gkk at hotmail.com>
To: WA5CAB, Robert Downs <wa5cab at cs.com>
Cc: boatanchors <boatanchors at mailman.qth.net>
Sent: Thu, Jan 7, 2016 11:38 am
Subject: Re: [Boatanchors] DC Voltmeter Calibration

I'd bet you'd get a lot closer than what you have already 
by using a cheap (sometimes even free) digital meter 
from Harbor Freight as a "standard for comparison." 
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* Oklahoma City, OK * 
* USAF, Ret'd 61-81 * 
** FAA, Ret'd 94-10 * 
* * * * * * * * * * * 
 
 


> Date: Thu, 7 Jan 2016 13:02:11 -0500
> To: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] DC Voltmeter Calibration
> From: boatanchors at mailman.qth.net
> 
> A quick and dirty way that will get you a lot closer than +/- 45 VDC would 
> be to rig up a VR-150 running at about 20 mA.
> 
> In a message dated 01/07/2016 10:25:07 AM Central Standard Time, 
> dhallam at knology.net writes: 
> > I obviously need to calibrate my DC voltmeters.  I was setting the 300 
> > VDC B+ on my signal generation after some repairs.  I used 3 voltmeters 
> > and got a spread of 45V among the 3 of them, low 285V and high330V.  The 
> > low was a VTVM and the high  DVM.  What is a good standard to use that 
> > won't break the bank to acquire?  I used to have some mercury batteries 
> > but they are a no, no any more.
> > 
> > David
> > KW4DH
> 
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
 		 	   		  
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