[volt-nuts] Solartron 7081 Calibration Problem

[J. L. Trantham]

Mickle,

I have re-read the manual (again), reading the description of the
'Reference' input.

If I understand correctly, the positive side of 10 VDC goes to the HI
Reference input and the negative side goes to three terminals, the Reference
LO input, the Reference 0V input, and the main LO of the front panel input.

Correct?

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of J. L. Trantham
Sent: Monday, September 03, 2012 6:45 AM
To: 'Ìèõàèë'; 'Discussion of precise voltage measurement'
Subject: Re: [volt-nuts] Solartron 7081 Calibration Problem


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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