[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.
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
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!
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?
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