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Basic Operations for RF Devices Measurement
STEP 3. Calibration
STEP 3. Calibration
After turning the power ON, be sure to connect the 0 S (OPEN), 0 Ω (SHORT), 50 Ω
(LOAD), and low-loss capacitor (optional) to the calibration reference plane and perform
calibration. The calibration reference plane of the E4991A is usually the 7-mm terminal of
the test head. This step is done to ensure that the calibration reference plane meets the
specified measurement accuracy.
Calibration and fixture compensation data are measured at either fixed frequency points
(initial setting) and user-defined points. When selecting fixed frequency point calibration,
the types of power points at which data are measured include fixed power points and
user-defined power points (Table 3-7). In this section, calibration is performed at fixed
frequency/fixed power points.
Table 3-7
Types of measurement points for calibration/fixture compensation data
Measurement points for
calibration/fixture compensation data
Fixed power points
Fixed
frequency
User-defined power
points
points
User-defined frequency/user-defined
power points
NOTE
When performing oscillator level sweep and dc bias sweep, calibration and fixture
compensation at the fixed frequency/user-defined power points cannot be selected.
The basic procedure for the calibration is illustrated in Figure 3-26.
Figure 3-26
Basic flow for calibration
60
Calibration/fixture compensation data
when sweep conditions are changed
Valid
Valid (except when the OSC level setting
is changed)
Invalid
Time required
Accuracy of
to measure
measurement
data
Good
Long
↑
Good
Better
Short
Chapter 3
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