KYORITSU 3131A - Manual (Page 9)

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5. Preparation for Testing
5-1 Removing the Cover
Model 3131A has a dedicated cover to protect against an impact from
the outside and prevent the operation part, and the connector socket
from becoming dirty.
Remove the cover and put it on the back side of the main body to make
measurements.
5-1-1 Method of removing the cover
5-1-2 Method of housing the cover
Fig.2
Fig.3