Anritsu MG3641A - Manual (Page 6)

For Safety
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CAUTION
This equipment uses a Poly-carbomonofluoride lithium battery to backup
the memory. This battery must be replaced by service personnel when
it has reached the end of its useful life; contact the Anritsu sales section
or your nearest representative.
Note: The battery used in this equipment has a maximum useful life of
7 years. It should be replaced before this period has elapsed.
This instrument is designed for an industrial environment.
In a residential environment this instrument may cause radio interference
in which case the user may be required to take adequate measures.
Replacing Memory
Back-up Battery
Use in a residential
environment