User Calibration In Cat And Na Modes; Factory Calibration; Quickcal - Agilent Technologies FieldFox N9923AN Service Manual

RF Vector Network Analyzer
N9923AN

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 N9923AN FieldFox RF Vector Network Analyzer User's Guide (Part Number
N9923-90006) "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
Indicator
Cal Rdy Preset (factory) calibration is active
Cal ON Q QuickCal calibration is active
Cal ON U User Calibration is active
Cal OFF Calibration is inactive
No calibration available to activate
Cal OFF*
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

QuickCal

The QuickCal function mathematically "extends" the preset calibration to the end of a
cable or adapter. It is a firmware only function; it does not involve analyzer hardware.
Service Guide N9923-90005
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.
Theory of Operation
Chapter 8.
5-21