[volt-nuts] Calibration Sources for Solartron 7081

J. L. Trantham jltran at att.net
Sun Jun 24 04:17:44 UTC 2012


I made it through the DC Cal steps this evening and I was reading about the
Ohms calibration.

What resistance standards are needed?  10000 ohms and 1000 ohms?  4 wire or
2?

Thanks,

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Jean-Louis Noel
Sent: Friday, June 22, 2012 9:25 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Calibration Sources for Solartron 7081


Hi J. L.

From: "J. L. Trantham" <jltran at att.net>

> However, AC promises to be a problem.  I guess I will try using a 
> signal generator and an amplifier to see what output level and 
> stability I can achieve.
You have to link the amplifier to your DC standard to have the stability
needed.
 
> But still, what frequency?  60 Hz?  1 kHz?
The 'basic' calibration is usually performed at 400Hz.
With check at higher frequencies (40KHz and 400KHz for the 7081) to know if
it's still properly compensated.

Bye,
Jean-Louis

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