Keysight N9912A - User Calibration in CAT and NA Modes; One Port Calibration

Keysight N9912A Service Guide 5-27
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 FieldFox User’s Guide “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).
When choosing the “Connector Type”, choose the characteristics that
correspond to the cal kit you will use. For the standard FieldFox Tee cal kit, part
number 1250-3607, choose “Type-N–M-”.
Do not leave cal standards connected to the RF IN or RF OUT ports for more
than three minutes. Heat in the port connectors may affect the accuracy of the
standards.
One Port Calibration
One port calibration applies only to 1-port measurements in CAT and NA
modes. When the analyzer is adjusted at the factory or during annual
calibration, a preset calibration is stored in the analyzer.
The preset calibration covers the full frequency range of the analyzer. The
preset calibration is active whenever “Cal ON” 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 RF
OUT connector when the analyzer has thermally stabilized to room
temperature. Operation at other temperature conditions may impact
measurement accuracy when applying the preset calibration.
Table 5-2 Cal Status Indicators
Indicator Meaning Additional Indicators
Cal ON Preset (factory) calibration is active * = interpolation active
? = Measurement conditions have changed.
Cal ON Q QuickCal calibration is active * = interpolation active
? = Measurement conditions have changed.
Cal ON U O, S, L calibration is active * = interpolation active
? = Measurement conditions have changed.
Cal OFF Calibration is inactive
Cal OFF* No calibration available to activate for this
measurement.