User Calibration In Cat And Na Modes; Factory Calibration - Keysight N9923A Service Manual

Theory of Operation

User Calibration in CAT and NA Modes

User Calibration in CAT and NA Modes
There are two types of calibrations for the CAT and NA modes: one port and
two port. See the N9923A FieldFox RF Vector Network Analyzer User's Guide
(Part number N9923-90001) "Calibration for CAT and NA Modes" section for
specific instructions for performing these calibrations. A calibration performed
in CAT mode will be applied in NA mode and vice versa.
When a user calibration is performed, the full frequency range of the analyzer
is calibrated even though the current state of the analyzer may be less than the
full range. This allows a calibration to be "interpolated" beyond the frequencies
set at the time of calibration (an asterisk "*" on the display indicates
interpolation).
Do not leave cal standards connected to the PORT 2 or PORT 1 ports for more
than three minutes. Heat in the port connectors may affect the accuracy of the
standards.
Table 5-2 Cal Status Indicators
Ind icator Meaning
CalRdy Preset (factory) calibration is active
Cal ON Q QuickCal calibration is active
Cal ON U User calibration is active
Cal OFF Calibration is inactive
Cal OFF* No calibration available to activate for this
measurement.

Factory Calibration

When the analyzer is adjusted at the factory or during annual calibration, a
preset calibration is stored in the analyzer (CalReady).
The preset calibration covers the full frequency range of the analyzer. The
preset calibration is active whenever "CalRdy" is displayed on the left side of
the screen. Presetting the analyzer activates the preset calibration.
The preset calibration provides very good measurement performance at the
PORT 1 and Port 2 connectors when the analyzer has thermally stabilized to
room temperature.
The preset calibration should be re-characterized every 12 months to maintain
accuracy. This is accomplished via the Error Terms adjustment in the TME.
Refer to
5-22
Chapter 3.
Add itional Ind icators
* = interpolation active
? = Measurement conditions have changed.
* = interpolation active
? = Measurement conditions have changed.
* = interpolation active
? = Measurement conditions have changed.
Keysight N9923A Service Guide