Keysight Technologies B1500A Self-Paced Training Manual page 24

Module 1
Introduction
The GSWU must be connected to the outer conductors of the manipulators/positioners connected to
the Force1/CMUH and Force2/CMUL connectors of the SCUU. And the GSWU control cable must
be connected between the GSWU and the SCUU.
When the SMU paths are available for the manipulators/positioners, the GSWU opens between the
outer conductors. However, when the MFCMU paths are available, the GSWU shorts them together
to make the return path of measurement current. This will reduce the signal path impedance. And this
is effective for the accurate capacitance measurement.
By using the EasyEXPERT software, cable length between the CMU and the SCUU is automatically
detected, and the GSWU switch control is automatically performed. Also, capacitance error
compensation is also automatically performed if the compensation data are available.
The GSWU is effective for
•reducing the residual inductance of the measurement cable
•stabilizing the residual inductance when measurement cable distance is changed (moved)
It's roughly 1/10 to 1/30 when used with two 80 cm cable.
Note:
When the SMU paths are available for the manipulators/positioners, the connection between the
outer conductors must be broken because they are connected to the SMU guard terminals separately
and the guard terminals must be opened at the end of the extension.
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