User Calibration In Cat And Na Modes; One Port Calibration - Keysight N9912A Service Manual

RF Analyzer
N9912A

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.
Table 5-2. Cal Status Indicators
Indicator
Cal ON Preset (factory) calibration is active
Cal ON Q QuickCal calibration is active
Cal ON U O, S, L calibration is active
Cal OFF Calibration is inactive
No calibration available to activate for this
Cal OFF*
measurement.

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.
The preset calibration should be re-characterized every 12 months to maintain accuracy. This is
accomplished via the Error Terms test/adjustment in the TME. Refer to
Under ideal conditions, a preset calibration and an OSL (open, short, load) calibration should give very
similar results for measurements at the RF OUT port.
Service Guide N9912-90003
Meaning
User Calibration in CAT and NA Modes
Additional Indicators
* = interpolation active
? = Measurement conditions have changed.
* = interpolation active
? = Measurement conditions have changed.
* = interpolation active
? = Measurement conditions have changed.
Chapter 3.
Theory of Operation
5-25