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Calibration and Compensation
Calibration and Compensation Functions
Calibration and Compensation Functions
The following describes the calibration and compensation functions of the Agilent
Technologies 4287A.
Types of calibration and compensation functions
The Agilent 4287A has four calibration and compensation functions as shown in Table 6-1.
Table 6-1
Overview of Agilent 4287A RF LCR calibration and compensation functions
Type of calibration and
compensation functions
Open/short/load calibration
Low-loss capacitor
calibration
Compensation of port
extension
(Fixture selection)
Open/short compensation
116
Procedures
Connect each of three standards
(open/short/load calibration
standards) to the desired reference
plane (terminal) and measure all of
*1
the calibration data
. This reference
plane is called a calibrated reference
plane.
Connect a low-loss capacitor
reference plane for calibration and
measure calibration data (immediately
after open/short/load calibration).
This is possible only when a 7-mm
terminal is used as a reference plane
for calibration.
Use numerical values to enter the
electrical length data from the
calibration reference plane subjected
to open/short/load calibration through
to the connection plane of the DUT.
Electrical length data for dedicated
test fixtures are already registered in
the 4287A, so you can set the required
electrical length by simply selecting
the model number of the test fixture to
be used.
To connect the DUT to the terminal
extended from the calibration
reference plane subjected to
open/short/load calibration, keep the
DUT connection terminal open and
measure the open compensation data.
Then, short out the terminal and
measure the short compensation
*1
data.
Effect
Removes the error factors from the
measuring instrument through to the
calibration reference plane. To
perform calibration at the terminal
connected with the DUT, no other
calibrations or compensations are
necessary.
*2
Reduces measurement error of high Q
to the
(low dissipation factor) at the
frequency band of 1 GHz or more
where reduction is difficult when
done only by open/short/load
calibration.
Corrects additional errors resulting
from the phase shift occurring
between the calibration reference
plane and the connection plane of the
DUT. When the test head coaxial
terminal is used as a reference plane
for calibration, this additional
compensation must be performed.
Removes error factors from the
calibration reference plane to the
plane subjected to open/short
compensation. When the test head
coaxial terminal is used as a
calibration reference plane, this
additional compensation must be
performed.
Chapter 6
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