Instruction manual

11 6 Chapter 6
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
Procedures Effect
Open/short/load calibration Connect each of three standards
(open/short/load calibration
standards) to the desired reference
plane (terminal) and measure all of
the calibration data
*1
. This reference
plane is called a calibrated reference
plane.
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.
Low-loss capacitor
calibration
Connect a low-loss capacitor
*2
to the
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.
Reduces measurement error of high Q
(low dissipation factor) at the
frequency band of 1 GHz or more
where reduction is difficult when
done only by open/short/load
calibration.
Compensation of port
extension
(Fixture selection)
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.
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.
Open/short compensation 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
data.
*1
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.