Keysight 1143A, User'S And Service Manual

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provides a positive offset in the probe. The output of the probe goes
negative.
•
The offset voltage must be referenced to the appropriate (Probe 1 or
Probe 2) offset common of the remote input connector.
•
To eliminate offset when using remote, the remote offset input must be set
to 0.0 V, disconnected, or grounded.
To minimize dc offset errors and potential noise coupling caused by ground
loops, electrically isolate all connections between the remote input connector
and the controlling system.
Operating the Power Module
Remote Offset Input
15