I read in !emc-pstc that [email protected] wrote (in
<[email protected]>) about 'Low Leakage
Variac', on Wed, 30 Jan 2002:

>Can anyone provide me with the manufacturer and model of a variac that they
>have used that does not add leakage to their product test results.  

Someone may have already produced one that has lower leakage, but you
won't get near-zero leakage, which is due to capacitance between the
winding and the core, unless you can get one with the core not grounded.

You can reduce the leakage with a grounded core by increasing the
thickness of insulation between the winding and the core. Not difficult.
-- 
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk 
After swimming across the Hellespont, I felt like a Hero.
PLEASE do NOT copy news posts to me by E-MAIL!

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