[volt-nuts] Solartron 7081 Calibration Problem

[J. L. Trantham]

Mickle,

Thanks for your response.  How is your 7081 doing that you were making PCB
modifications to?

I guess I missed that somewhere in the manual.  They just said connect to
the input.  I missed the 'reference' to reference input.  I will need to get
a proper connector.  So, if I understand, short the front panel input and
apply 10 VDC to the Reference input.

Also, what do you use for a 'short circuit plug'?  I just made up a
connector connecting pin 2 to pin 4 (HI to LO) and left the other pins open.
Is that correct?

I also, just now, noted that I missed a few steps in the resistance
calibration.

Back to the drawing board, so to speak.

Thanks again.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Ìèõàèë (Mickle)
Sent: Sunday, September 02, 2012 11:33 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 Calibration Problem


Joe,
'CALIBRATE REFERENCE' command refers to RATIO/REFERENCE input channel
calibration, located on the back side of 7081. It isn't calibration of the
internal voltage reference (zener). So, you should apply a +10 V to 'RATIO
HI' input and connect -10 V to 'RATIO LO', 0V and main input LO.

Regards,
Mickle T.

Monday, September 3, 2012, 2:57:28 AM, you wrote:
JLT> I went through the calibration process today, using the manual and 
JLT> my 'new' Fluke 5100B.  I made a 'short circuit plug' by connecting 
JLT> 'HI' to 'LO' only. All was OK until the last step of 'CALIBRATE 
JLT> REFERENCE'.  I kept getting 'FACTOR OUT OF RANGE'.  What am I 
JLT> missing? However, after checking it against my other, Ametek 
JLT> calibrated, 7081, the readings on the various scales are very 
JLT> close, about 10 uV at 10 VDC, for instance, and 2 mV at 10 VAC 
JLT> using a 1 kHz signal and about 36 ohms at 1 MegOhm.  This is a 
JLT> significant improvement from where it started.
JLT>
JLT> Thanks for any help.
JLT>
JLT> Joe



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