4-6 Agilent 4155B/4156B User’s Guide Vol.2, Edition 5
Making a Measurement
Connecting DUT
Using Connector Plate
This section provides the information useful for connecting cables and probing
needles to a connector plate.
•“To Reduce Leakage Current”
•“To Measure Low Resistance”
To Reduce Leakage Current
To reduce the leakage current caused by connection cables, the guard technique is
effective. Connect the probing needles to the terminals of the connector plate by
using coaxial cables as shown below:
1. At end of cable, connect coaxial center conductor to force terminal of connector
plate, and connect coaxial outer conductor to guard terminal of connector plate.
2. At another end, connect coaxial center conductor to tail of the probing needle.
Never connect the outer conductor at this cable end.
Extend the outer conductor as close as possible to the probing needle.
WARNING Do not touch the guard terminal with bare hands because you may be shocked
by high voltage. The potential of the guard terminal is equal to the output
voltage.
CAUTION Never connect the guard terminal to any other output, including circuit common,
frame ground, or the terminals of any other unit. Doing so may damage the unit.
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