Solartron 7081
Joe,
...Correction to my previous statement regarding HP 3457A ACAL:
Being so used to the HP 3458A's ACAL functions, I think I incorrectly
attributed some 3458A ACAL features to the 3457A. Although the 3458A ACAL
re-generates new "temporary" digital correction constants for DCV gain,
apparently the 3457A ACAL does not do that.
According to the 3457A Service Manual, its ACAL routine adjusts DC offsets
of its AC amplifier, adjusts its AC attenuator flatness, and adjusts its
ohms precharge amplifier.
So, apparently the only time 3457A DCV gain is adjusted is during actual
"real" calibration against external voltage standards.
This being the case, I assume your 3457A's 10Vdc reading will not change
immediately after ACAL ALL.
Let us know if that's the case?
-Greg
----- Original Message -----
From: "J. L. Trantham" jltran@att.net
To: "'Discussion of precise voltage measurement'" volt-nuts@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@febo.com [mailto:volt-nuts-bounces@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".
..........
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
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and follow the instructions there.
Greg,
I did the 'ACAL' on the 3457A and the reading is basically the same,
10.00005, which, assuming I have my math correct, the 'black face' 731B is
accurate, is about 5 ppm.
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com]On
Behalf Of gbusg
Sent: Saturday, September 03, 2011 6:57 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081, other meters,and some voltage
standards
Joe,
...Correction to my previous statement regarding HP 3457A ACAL:
Being so used to the HP 3458A's ACAL functions, I think I incorrectly
attributed some 3458A ACAL features to the 3457A. Although the 3458A ACAL
re-generates new "temporary" digital correction constants for DCV gain,
apparently the 3457A ACAL does not do that.
According to the 3457A Service Manual, its ACAL routine adjusts DC offsets
of its AC amplifier, adjusts its AC attenuator flatness, and adjusts its
ohms precharge amplifier.
So, apparently the only time 3457A DCV gain is adjusted is during actual
"real" calibration against external voltage standards.
This being the case, I assume your 3457A's 10Vdc reading will not change
immediately after ACAL ALL.
Let us know if that's the case?
-Greg
----- Original Message -----
From: "J. L. Trantham" jltran@att.net
To: "'Discussion of precise voltage measurement'" volt-nuts@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@febo.com [mailto:volt-nuts-bounces@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".
..........
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
Hi Joe,
Yes, that's 5 ppm difference between 3457A and black 731B.
I'm betting that your 731B, 3457A and 7081 are all in great shape at 10Vdc.
Now all you need is the proposed round-robin (or other external cal at a
lab) to know for sure.
The more I read the Solartron 7081 manual, the more interesting it looks to
me. ...Looks like some pretty clever engineering!
--Greg
----- Original Message -----
From: "J. L. Trantham" jltran@att.net
To: "Discussion of precise voltage measurement" volt-nuts@febo.com
Sent: Sunday, September 04, 2011 2:51 PM
Subject: Re: [volt-nuts] Solartron 7081, other meters,and some voltage
standards
Greg,
I did the 'ACAL' on the 3457A and the reading is basically the same,
10.00005, which, assuming I have my math correct, the 'black face' 731B is
accurate, is about 5 ppm.
Joe