[volt-nuts] Solartron 7081, other meters, and some voltage standards

[gbusg]

To invoke 'ACAL ALL':

1. Press "Auto Cal"
2. Press the 'down' arrow to scroll thru menu, stopping at "ACAL ALL"
3. Press "ENT"
4. Wait a couple of minutes while ACAL automatically re-generates new ACAL 
correction constants.

Note: The 'down' arrow is below the LCD display area.

ACAL generates new temporary cal constants based on internal measurements. 
For example it re-generates a digital correction constant for DCV gain so 
that, despite DC circuit gain drift over time, the meter once again "sees" 
the internal zener reference voltage as equal to the voltage it measured the 
last time a Cal Lab performed digital adjustment (of your 3457A against 
external standards including a precision voltage reference). In other words, 
immediately after ACAL, your 3457A error at 10Vdc will mostly be a function 
of the drift of its internal zener voltage reference. Drift due to other 
causes will mostly be subtracted-out during ACAL.

ACAL is invoked by (and is the responsibility of) the end-user.

Digital Calibration (against external standards) is a different thing, not 
to be invoked unless one has access to the right, precision standards.

Now that we know you didn't invoke ACAL yet, it will be interesting to see 
how different the results are. (They will be different.)

Let us know.

Greg


----- Original Message ----- 
From: "J. L. Trantham" <jltran at att.net>
To: "'Discussion of precise voltage measurement'" <volt-nuts at febo.com>
Sent: Friday, September 02, 2011 8:28 PM
Subject: Re: [volt-nuts] Solartron 7081, other meters,and some voltage 
standards


I have not yet read the manual.  Can you educate me about the 'ACAL ALL'?

I presume that the 'calibration' standards loaded at the last official
calibration are stored and can be 'reloaded' when needed.  Correct?

Thanks,

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of gbusg
Sent: Friday, September 02, 2011 6:52 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081, other meters,and some voltage
standards


Hi Joe,

.........

After several hours warm-up, be sure to run "ACAL ALL".

..........



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