Re: Tricks and thoughts about the 3457A battery
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I did it ! I replaced the memory battery in my 3457A.
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My used 3457A was built in the late '80s and still had its original lithium battery, with a 1989 date code on it. This battery obviously needed replacement.
Another option is to ignore trying to save the calibration constants, replace the battery and send it to Keysight and let them calibrate it. Then it will be as good as you will get it. I did that, and they replaced the battery. There were before and after measurements - they made no attempt to save the constants. So everything was better after calibration. In contrast if you send it there are calibration constants about right, if it's in spec they will not adjust it. In contrast, by putting them all wrong, everything needs adjustment.?
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Dr. David Kirkby, Kirkby Microwave Ltd