104 Keysig ht N9923-90001 User’s GuideCalibration for NA, CAT, and VVM Modes— A THRU standard is used during some calibration steps to connect PORT 1to PORT 2 in place of the DUT. A Flush THRU connection can be madewhen cables that connect with the DUT can mate with each other. Learnmore in “Mechanical Cal” on page 108. Otherwise, any reasonably shortcable can be used as a THRU standard.Calibration Reference Plane is the point (or points) at which the DUT and calstandards are connected during a calibration. This can be at the FieldFox testport connectors, or at the end of jumper cables or adapters.CalReadyEvery FieldFox contains a factory calibration that was performed at the port 1and port 2 connectors, with -15 dBm input power, over the entire frequencyrange of the FieldFox using a number of data points that allows reasonableinterpolation over the FieldFox frequency range.This calibration, known as CalReady, allows you to immediately makemeasurements of a DUT that is connected directly at the test ports (PORT 1and/or PORT 2). CalReady corrects measurements when the FieldFox is turnedON and when a measurement is created with no other correction in place.When measuring a DUT using a jumper cable or adapter - NOT a directconnection to a test port connector – then a QuickCal or Mechanical Cal isrecommended. CalReady can also be used to check the integrity of the jumpercable that is attached to the test ports.CalRdy is shown when a measurement is corrected using CalReady.You can change the properties of the CalReady calibration. Learn more in“CalReady” on page 104.Learn how to see when your factory CalReady calibration was performed in“System Information” on page 235.How to Perform a CalibrationIn CAT, NA, or VVM Mode, press Cal 5.Press Esc at any time to end the calibration process.
