[volt-nuts] Solartron 7081 Calibration Problem
J. L. Trantham
jltran at att.net
Mon Sep 3 11:44:55 UTC 2012
Thanks for your response. How is your 7081 doing that you were making PCB
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
Back to the drawing board, so to speak.
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
'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.
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> Thanks for any help.
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