Keysight Technologies FieldFox N9913A Service Manual

Also see for FieldFox N9913A: User guide Security features and volatility documentation Configuration guide

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Keysight Technologies FieldFox N9913A Service Manual Manual pdf 83 page image

Keysight FieldFox Handheld Analyzers Service Guide 83Theory of OperationUser Calibration in CAT, NA, and VVM ModesUser Calibration in CAT, NA, and VVM ModesThere are three types of calibrations for the CAT, NA and VVM modes:CalReady, QuickCal and Mechanical Cal. See the FieldFox Analyzer User'sGuide (Part Number N9927-90001) "Calibration for CAT, NA and VVM Modes"section for specific instructions for performing these calibrations. Because NA,CAT, and VVM modes are very similar, a calibration that is performed in onemode can also be applied in the other modes.When a user calibration is performed, the full frequency range of the analyzeris calibrated even though the current state of the analyzer may be less than thefull range. This allows a calibration to be "interpolated" beyond the frequenciesset at the time of calibration (an asterisk "*" on the display indicatesinterpolation).Do not leave cal standards connected to the PORT 2 or PORT 1 ports for morethan three minutes. Heat in the port connectors may affect the accuracy of thestandards.Factory Calibration (CalReady)When the analyzer is adjusted at the factory or during annual calibration, apreset calibration is stored in the analyzer (CalReady).The preset calibration covers the full frequency range of the analyzer. Thepreset calibration is active whenever “CalRdy” is displayed on the left side ofthe screen. Presetting the analyzer activates the preset calibration.The preset calibration provides very good measurement performance at thePORT 1 and Port 2 connectors when the analyzer has thermally stabilized atroom temperature.The preset calibration should be re-characterized every 12 months to maintainaccuracy. This is accomplished via the Error Terms adjustment in the TME.Refer to Chapter 3.