[Boatanchors] Dc Voltmeter Calibration

[Howard Weeks]

There are some very accurate zener diodes out there.

Howard K5JCP

On 2/14/2016 1:42 PM, David C. Hallam wrote:
>> 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
>
> After reading the various replies to my post about the accuracy of my
> voltmeters, I will retract my skepticism of the accuracy to DMD's. in
> general and mine in particular.  I bought a  voltage standard on eBay. I
> found my DMM very accurate while my HP 410B, 410C, and RCA WE-77 were
> off by varying amounts.
>
> David
> KW4DH
>