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Discussion of precise voltage measurement

What's the probability of a random used 3458A passing a Keysight calibration?

Dr. Frank

Tue, Jan 16, 2018 10:39 PM

I also saw this, so at least, they will have adjusted this range.

Yes you're right, the ADC is the A3 board. I confused that with the A5
controller board, which is the only one which had been redesigned to SMT
components.

There's no chance to identify a refurbished or replaced board, other
than opening the case and looking inside.
And even then, it's not evident, that the ADC IC is ok. You only might
do the test according to AN-18.

Replacement boards will have the same part number, which changes only by
redesign.

Frank

I also saw this, so at least, they will have adjusted this range. Yes you're right, the ADC is the A3 board. I confused that with the A5 controller board, which is the only one which had been redesigned to SMT components. There's no chance to identify a refurbished or replaced board, other than opening the case and looking inside. And even then, it's not evident, that the ADC IC is ok. You only might do the test according to AN-18. Replacement boards will have the same part number, which changes only by redesign. Frank

David C. Partridge

Tue, Jan 16, 2018 10:52 PM

Surely the AC errors if any must be associated with the A2 AC Convertor board - 03458-66502?

Dave

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Dr. Frank
Sent: 16 January 2018 22:39
To: volt-nuts@febo.com
Subject: [volt-nuts] What's the probability of a random used 3458A passing a Keysight calibration?

I also saw this, so at least, they will have adjusted this range.

Yes you're right, the ADC is the A3 board. I confused that with the A5 controller board, which is the only one which had been redesigned to SMT components.

There's no chance to identify a refurbished or replaced board, other than opening the case and looking inside.
And even then, it's not evident, that the ADC IC is ok. You only might do the test according to AN-18.

Replacement boards will have the same part number, which changes only by redesign.

Frank

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Surely the AC errors if any must be associated with the A2 AC Convertor board - 03458-66502? Dave -----Original Message----- From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Dr. Frank Sent: 16 January 2018 22:39 To: volt-nuts@febo.com Subject: [volt-nuts] What's the probability of a random used 3458A passing a Keysight calibration? I also saw this, so at least, they will have adjusted this range. Yes you're right, the ADC is the A3 board. I confused that with the A5 controller board, which is the only one which had been redesigned to SMT components. There's no chance to identify a refurbished or replaced board, other than opening the case and looking inside. And even then, it's not evident, that the ADC IC is ok. You only might do the test according to AN-18. Replacement boards will have the same part number, which changes only by redesign. Frank _______________________________________________ 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.