[Boatanchors] DC Voltmeter Calibration

[WA5CAB at cs.com]

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

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