[volt-nuts] 7081 resistance accuracy issue

m k m1k3k1 at hotmail.com
Sun Jan 20 04:05:57 EST 2013

Hi everyone, 

As part of my checking over of the behaviour of the 7081 I ran "mode,testk" and "nines=8" overnight, the result is a swing larger than I would expect!

max 166.00455
min 166.00040
this means a 25 ppm shift 

The circuit is meant to generate a constant current, so if that constant current can vary by 25ppm over a 20-23 degree house temperature then it is only accurate to 25ppm for resistance measurement except when used as a transfer standard.

anyone else find a similar shift?

M K 

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