Miguel,
please check more carefully the age of your instrument, and please
indicate precisely what's printed on the SnapHat batteries!
Agilent branded 3458A were made from about 2000 onwards only, and the
newer A5 board even later, so your batteries can't be from 1999 or 1994.
Please check in your unit, compared to here:
https://xdevs.com/fix/hp3458a/#a5rev, what the date code on U110, or
U111-U113 is. That's more probably the age of your unit, or of the A5
board, I strongly assume it's from 2004.
The date code on the ST SnapHat batteries is decoded like '99 YMM'.
If you have something like 4xx for this D.C., then it's probably 2004.
This Guy M.J. Lorton in his video
https://www.youtube.com/watch?v=loQYTtrFqKY completely confused the
decoding of his freshly bought SnapHats. 741 were his original
batteries, which probably decodes into 2007, CW41
He then bought new batteries in 2016 and these were all either 429, or
452. These batteries were all from 2014, not 2004, as he assumed, not
thinking about a probable 10 years wrap around of the D.C.
New batteries with 8xx or 9xx should be fine, being from 2018 or 2019.
Frank
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