136 Chapter 6
Calibration
B. Calibration for Four-Terminal Pair, 1-m Extension
151.
NOTE When the measurement port is extended by 1 meter with the four-terminal pair
configuration, neither user calibration nor port extension compensation is required for
measurement (they cannot be performed).
Fixture Compensation When the 16451B is Used
When you perform only the fixture OPEN compensation and fixture SHORT
compensation, follow the normal fixture compensation procedures described in “Fixture
Compensation” on page 151.
If you perform the LOAD compensation in addition to the OPEN and SHORT
compensations, set the standard values as described below in accordance with the
procedures in “Defining the standard values for fixture compensation” on page 153.
Furthermore, when you perform the fixture OPEN compensation measurement, use
the LOAD key for the OPEN data measurement, and when you perform the fixture
LOAD compensation measurement, use the OPEN key for the LOAD data
measurement.
These irregular settings are required because the standard value of the Agilent
4294A is
defined as a series circuit model of resistance (R) and inductance (L) as shown in Figure
6-9 on page 153, while the 16451B usually requires a parallel circuit of capacitance (C)
and conductance (G) for LOAD compensation.
Softkey for Compensation Data Definition Setting Value
OPEN CONDUCT(G) Definition of equivalent parallel conductance
value for LOAD
standard
OPEN CAP(C) Definition of equivalent parallel capacitance
value for LOAD
standard
SHORT RESIST(R) Definition of equivalent series resistance value
for SHORT standard (usual definition)
SHORT INDUCT(L) Definition of equivalent series inductance
value for SHORT standard (usual definition)
LOAD RESIST(R) Definition of equivalent series resistance value
for OPEN
standard (set to maximum setting
value 100 GW)
LOAD INDUCT(L) Definition of equivalent series inductance
value for OPEN
standard (set to 0 H)
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