[Test-Equipment] Bridge Megger Tester. Series 2. 500 Volt.

[John Crighton]

Hello All,
I am looking for an instruction booklet or
any repair information for the 
Bridge Megger Tester.  Series 2.  500 Volt.
Made by Evershed and Vignoles.

I am guessing that this model is approximately
30 years old.

Insulation Test  is fine.

Resistance measurement in Bridge mode
works but not accurate. I'll look into that.

Varley Test   I know nothing.   Any one heard
of Varley Tests?

Regards,
John Crighton
Sydney