[volt-nuts] Solartron 7081 Calibration Problem

[J. L. Trantham]

Steve,

I thought of that and tried a voltage that was within about 10 uV of 10 VDC
as measured by my other, Ametek calibrated, 7081 and it still did not help.

Has me puzzled.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Steve Krull
Sent: Sunday, September 02, 2012 7:15 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 Calibration Problem

Joe,

What was the exact value of the DC reference voltage you were applying? 
I wonder if the 7081 has a limit built in so that if you're not using a 
reference that is pretty close to 10 vdc it will generate the error 
you're seeing? Just something to try - adjust your 10 vdc reference 
source a couple of millivolts each way and see what you get.

Steve


On 9/2/2012 5:57 PM, J. L. Trantham wrote:
> I went through the calibration process today, using the manual and my
'new'
> Fluke 5100B.  I made a 'short circuit plug' by connecting 'HI' to 'LO'
only.
> All was OK until the last step of 'CALIBRATE REFERENCE'.  I kept getting
> 'FACTOR OUT OF RANGE'.  What am I missing?
>
>   
>
> However, after checking it against my other, Ametek calibrated, 7081, the
> readings on the various scales are very close, about 10 uV at 10 VDC, for
> instance, and 2 mV at 10 VAC using a 1 kHz signal and about 36 ohms at 1
> MegOhm.  This is a significant improvement from where it started.
>
>   
>
> Thanks for any help.
>
>   
>
> Joe
>
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