Panasonic VP-7721A Manual page 24

Floating/unfloating selector switch
Slide switch to select floating or unfloating input arrangement
of the measurement section.
Input connectors A and B
Floating connection can be made using two BNC receptacles, INPUT
A and B, with the slide switch
(is)
in its left position.
With the slide switch (l6j in its right position, unfloating
connection can be made using only the INPUT A receptacle. The
input supplied to the INPUT B receptacle is disconnected from the
internal circuit in this arrangement.
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