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HP54645D looses HPIB address

Question asked by Eric003 on Oct 16, 2020

I have a HP54645D with HPIB module HP54657.

If I set a HPIB address eg. 13 this address is lost over 1 day, if I read the address back I get 10.

From a prior post I learned that it is not unusual that in old RAMs or EEPROMs "stored data files could be corrupted"

My questions:

-- is the HPIB bus address also stored in NV-RAM (buffered by a lithium battery, type STM48Z18) ?

-- are any factory data stored in this NV-RAM which may be lost when the chip is changed ?