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Discussion of precise voltage measurement

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Looking for SCPI configuration of a 3457A/44492A

RB
Reginald Beardsley
Sun, Jan 12, 2020 2:24 AM

I recently had the good fortune to get a good deal on one to use for logging my voltage references which spares me the need to build a multiplexer from 44421A cards for a 34401A.

I thought I'd ask if anyone has SCPI configuration examples for the setup they are willing to share.  I'd much prefer to focus on the math, rather than the boilerplate.

My interest is the aging function.  It looks to me to be of the form a+bexpf(x)).  That is very difficult to fit, but I've had a lot of practice and have done fits where the exponent, f(x), was a 4th or 5th order polynomial of x.

As I have not been able to get machine readable historical data from anyone I'll have to collect my own.  Somewhat annoying to have to wait 3-5 years or longer to collect the data for an afternoon experiment in fitting an empirical function to the data. But I don't seem to have a choice.

Reg

I recently had the good fortune to get a good deal on one to use for logging my voltage references which spares me the need to build a multiplexer from 44421A cards for a 34401A. I thought I'd ask if anyone has SCPI configuration examples for the setup they are willing to share. I'd much prefer to focus on the math, rather than the boilerplate. My interest is the aging function. It looks to me to be of the form a+b*exp*f(x)). That is very difficult to fit, but I've had a lot of practice and have done fits where the exponent, f(x), was a 4th or 5th order polynomial of x. As I have not been able to get machine readable historical data from anyone I'll have to collect my own. Somewhat annoying to have to wait 3-5 years or longer to collect the data for an afternoon experiment in fitting an empirical function to the data. But I don't seem to have a choice. Reg