[Collins] Bucking Voltage -AC Line voltage

[RJ Mattson]

I have 3 AC panel meters, Simpson 260 and a Senior VoltOhmist among others.
All the above read a different line voltage.
How can I calibrate my meters for the correct AC line voltage?
Bob...w2ami
http://www.qrz.com/callsign/w2ami


----- Original Message ----- 
From: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
To: "David Knepper" <cra@floodcity.net>
Cc: "Bill Haselmire" <bg1@firststep.net>; <collins@mailman.qth.net>
Sent: Thursday, November 20, 2003 10:34 PM
Subject: Re: [Collins] Bucking Voltage


> Those filament windings are rated at 3 amps. Even though the power
> supply has a 4 amp fuse, I suspect 3 amps is about what it draws key
> down CW. Less average on SSB.
> 
> A transformer winding doesn't fail like a fuse at 125% of rated current.
> It just runs hotter. That makes the paper insulation age more rapidly.
> Power companies with oil filled but paper insulated transformers figure
> that intermittent loading to twice their rating only cuts the life to 20
> years from 40 years.
> 
> The up side of dropping the primary winding voltage is that the primary
> current is reduced, and the core losses are reduced. The primary current
> has smaller peaks from core saturation. That's a great benefit towards
> longevity.
> 
> Some only need 5 volts drop, some need 10 volts drop, it depends on the
> local utility and the loading at the time the supply is being used.
> 
> 73, Jerry, K0CQ, Technical Advisor to the CRA.
> 
> -- 
> Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
> Reproduction by permission only.
>