[volt-nuts] 7081 resistance accuracy issue

David C. Partridge david.partridge at perdrix.co.uk
Sun Jan 20 06:13:00 EST 2013

How long had the meter been powered on for when you started the test?  Think days rather than hours to stabilise. 

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of m k
Sent: 20 January 2013 09:06
To: volt-nuts at febo.com
Subject: [volt-nuts] 7081 resistance accuracy issue

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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