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G

gsteinba52@aol.com

Sun, Nov 13, 2011 4:56 PM

  Hi Joe,

Please keep us in the loop for this continuing story. Free (!) Repair/Cal, eh - maybe I should send my unit in before they figure things out...

What sort of environment do you have. Most gear, and particularly one at this performance level, is cal'ed at a specific ambient temperature/humidity. If you're using it as a transfer standard you should take this into account.

Jerry

Message: 1
Date: Sat, 12 Nov 2011 22:25:06 -0600
From: "J. L. Trantham" <jltran@att.net>
To: "'Discussion of precise voltage measurement'" <volt-nuts@febo.com>
Subject: [volt-nuts] Solartron 7081 Calibration Update
Message-ID: <20E160D1FE004171B107EA1F7C4D2684@S0028384766>
Content-Type: text/plain; charset="US-ASCII"

Having shipped my 7081 to AMETEK in Oak Ridge, TN, on Thursday September 29,
it returned Friday November 11, having completed it's trip to England and
back. It survived the trip without incident, left via FedEx and returned
via UPS.

The 'AS FOUND' was within spec except for the 1000 Kohm range (119% of Tol)
and the 100V and 1000V DC ranges (223% and 113% of Tol respectively).
Battery B1 was replaced (B401 had been replaced recently) along with three 1
K resistors and the front connector which was a problem to begin with.
Also, the front panel where the connector and CAL switch are located was
either replaced or redone. It was a bit scratched up when it left but is
pristine now. The 'AS LEFT' errors were typically single digit % of TOL
though the 1 V AC @ 100 kHz was 54% of Tol.

When it returned, I removed the 'CAL Sticker' over the CAL switch, put it in
the CAL position and downloaded the CAL DUMP. The numbers are different
from what I found before I sent it for calibration, as expected, but the
Zener Current Token Value was the same at 081. I suspect that this means
that the reference is now 'stable'. The 10.000000 V 'REFERENCE' was found
at 9.999856 V (72% of TOL) and was left at 9.999993 V (16% of TOL).

I used the 7081 to measure my 'standards' then used that data to calibrate
my 3458A. I then archived the DS1220Y 'CALRAM' data from the 3458A. Next
on the agenda will be sending the 3458A to Agilent for calibration.
Somewhere in there, I am going to have to learn to 'read' the data from the
3458A via HPIB.

So far the repair and calibration were free. I haven't seen a charge on the
AmExp card yet. The quoted price was $900 for calibration and alignment.
Battery replacement, repairs, and connector will be extra, not to mention
the shipping.

Joe

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End of volt-nuts Digest, Vol 27, Issue 18

Hi Joe, Please keep us in the loop for this continuing story. Free (!) Repair/Cal, eh - maybe I should send my unit in before they figure things out... What sort of environment do you have. Most gear, and particularly one at this performance level, is cal'ed at a specific ambient temperature/humidity. If you're using it as a transfer standard you should take this into account. Jerry ---------------------------------------------------------------------- Message: 1 Date: Sat, 12 Nov 2011 22:25:06 -0600 From: "J. L. Trantham" <jltran@att.net> To: "'Discussion of precise voltage measurement'" <volt-nuts@febo.com> Subject: [volt-nuts] Solartron 7081 Calibration Update Message-ID: <20E160D1FE004171B107EA1F7C4D2684@S0028384766> Content-Type: text/plain; charset="US-ASCII" Having shipped my 7081 to AMETEK in Oak Ridge, TN, on Thursday September 29, it returned Friday November 11, having completed it's trip to England and back. It survived the trip without incident, left via FedEx and returned via UPS. The 'AS FOUND' was within spec except for the 1000 Kohm range (119% of Tol) and the 100V and 1000V DC ranges (223% and 113% of Tol respectively). Battery B1 was replaced (B401 had been replaced recently) along with three 1 K resistors and the front connector which was a problem to begin with. Also, the front panel where the connector and CAL switch are located was either replaced or redone. It was a bit scratched up when it left but is pristine now. The 'AS LEFT' errors were typically single digit % of TOL though the 1 V AC @ 100 kHz was 54% of Tol. When it returned, I removed the 'CAL Sticker' over the CAL switch, put it in the CAL position and downloaded the CAL DUMP. The numbers are different from what I found before I sent it for calibration, as expected, but the Zener Current Token Value was the same at 081. I suspect that this means that the reference is now 'stable'. The 10.000000 V 'REFERENCE' was found at 9.999856 V (72% of TOL) and was left at 9.999993 V (16% of TOL). I used the 7081 to measure my 'standards' then used that data to calibrate my 3458A. I then archived the DS1220Y 'CALRAM' data from the 3458A. Next on the agenda will be sending the 3458A to Agilent for calibration. Somewhere in there, I am going to have to learn to 'read' the data from the 3458A via HPIB. So far the repair and calibration were free. I haven't seen a charge on the AmExp card yet. The quoted price was $900 for calibration and alignment. Battery replacement, repairs, and connector will be extra, not to mention the shipping. Joe ------------------------------ _______________________________________________ volt-nuts mailing list volt-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts End of volt-nuts Digest, Vol 27, Issue 18 *****************************************

JL

J. L. Trantham

Sun, Nov 13, 2011 11:28 PM

Jerry,

I really doubt the calibration and alignment will be free. I am going to
email Alan Highton (UK) and Lea Ann Cox (USA) to see if I can get a copy of
the invoice. All that came with unit was the calibration report and the
left over parts.

The calibration was to 'BS EN ISO9001:2008' standards. I scanned the report
and can send you a copy if you would like to take a look at it. It's my
first ever sending anything out for calibration. Kind of makes me feel like
my 'hobby' is moving up a step. Also gives me confidence now that I can
make accurate adjustments on some power meters, etc.

Joe

-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of gsteinba52@aol.com
Sent: Sunday, November 13, 2011 10:56 AM
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Solartron 7081 Calibration Update

  Hi Joe,

Please keep us in the loop for this continuing story. Free (!) Repair/Cal,
eh - maybe I should send my unit in before they figure things out...

What sort of environment do you have. Most gear, and particularly one at
this performance level, is cal'ed at a specific ambient
temperature/humidity. If you're using it as a transfer standard you should
take this into account.

Jerry

Jerry, I really doubt the calibration and alignment will be free. I am going to email Alan Highton (UK) and Lea Ann Cox (USA) to see if I can get a copy of the invoice. All that came with unit was the calibration report and the left over parts. The calibration was to 'BS EN ISO9001:2008' standards. I scanned the report and can send you a copy if you would like to take a look at it. It's my first ever sending anything out for calibration. Kind of makes me feel like my 'hobby' is moving up a step. Also gives me confidence now that I can make accurate adjustments on some power meters, etc. Joe -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of gsteinba52@aol.com Sent: Sunday, November 13, 2011 10:56 AM To: volt-nuts@febo.com Subject: Re: [volt-nuts] Solartron 7081 Calibration Update Hi Joe, Please keep us in the loop for this continuing story. Free (!) Repair/Cal, eh - maybe I should send my unit in before they figure things out... What sort of environment do you have. Most gear, and particularly one at this performance level, is cal'ed at a specific ambient temperature/humidity. If you're using it as a transfer standard you should take this into account. Jerry

JL

J. L. Trantham

Sun, Nov 13, 2011 11:38 PM

Forgot to mention. My workshop is a room I added off the garage when we did
a house renovation about 10 years ago. It has Heat and A/C, wired with lots
of outlets and sits about 25 to 26 degrees C year round. Right now, it's
25.0 degrees C. If I moved my shop temp to 22 degrees C, I think I would be
too cold.

The calibration was at 22 degrees C, 50% humidity. I'll have to get a
'barometer' for the shop to add the rest of the data points.

Joe

-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of gsteinba52@aol.com
Sent: Sunday, November 13, 2011 10:56 AM
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Solartron 7081 Calibration Update

  Hi Joe,

Please keep us in the loop for this continuing story. Free (!) Repair/Cal,
eh - maybe I should send my unit in before they figure things out...

What sort of environment do you have. Most gear, and particularly one at
this performance level, is cal'ed at a specific ambient
temperature/humidity. If you're using it as a transfer standard you should
take this into account.

Jerry

Forgot to mention. My workshop is a room I added off the garage when we did a house renovation about 10 years ago. It has Heat and A/C, wired with lots of outlets and sits about 25 to 26 degrees C year round. Right now, it's 25.0 degrees C. If I moved my shop temp to 22 degrees C, I think I would be too cold. The calibration was at 22 degrees C, 50% humidity. I'll have to get a 'barometer' for the shop to add the rest of the data points. Joe -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of gsteinba52@aol.com Sent: Sunday, November 13, 2011 10:56 AM To: volt-nuts@febo.com Subject: Re: [volt-nuts] Solartron 7081 Calibration Update Hi Joe, Please keep us in the loop for this continuing story. Free (!) Repair/Cal, eh - maybe I should send my unit in before they figure things out... What sort of environment do you have. Most gear, and particularly one at this performance level, is cal'ed at a specific ambient temperature/humidity. If you're using it as a transfer standard you should take this into account. Jerry

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Re: [volt-nuts] Solartron 7081 Calibration Update