In message <BC736E8BA2F94F0CB78739D7E04E9D07@KITCHEN>, "new" writes:

>If the cal constants are in the RAMs and the RAM batteries go dead,
>the 3458 needs to go back to Loveland, right?

The CALRAM can trivially be backed up via GPIB.

The backup can either be written into new NVRAM chips using a programmer
or it can with some difficulty be written back via GPIB.

I've explained the details in previous emails to the list (see archives)
and there is software to do the backup in my "Pylt" github project.

In the meantime, keeping it power on means the battery only drain
by their self-discharge.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
[email protected]         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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