Agilent 4155C/4156C User’s Guide Vol.1, Edition 11 2-39
Installation
Mounting Connectors
NOTE Low-Noise Coaxial Cable
For the extended measurement paths over the connector plate, use low-noise coaxial
cable (Agilent part number 8121-1191). This cable can maximize the guard effects
and minimize the impression of the external noise.
Following figure shows the cutting example of this cable. Key point is the isolation
between the conductive layer and the center conductor. So, cut and trim the end of
the cable as shown in this figure by using a cutter and so on.
CAUTION Never connect the Guard terminal to any output, including circuit common, chassis
ground, or any other guard terminal. Doing so will damage the SMU.
WARNING Potentially hazardous voltages, up to ±100 V (±200 V for HPSMU), are present
at the Force, Sense, and Guard terminals.
To prevent electrical shock, do not expose these lines.
Before turning the 4155C/4156C on, connect the Intlk terminal to a switch that
turns off when the shielding box access door is opened.
Before you touch any connections to these terminals, turn the 4155C/4156C off,
disconnect the power cable, and discharge any capacitors.
Insulator (black)
Outer conductor
(for Guard signal)
Insulator (clear)
Conductive layer (black)
Center conductor
(for Force/Sense signal)
approx. 10 to 15 mm
min 2 mm
Cover here using sleeve
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