266 Keysig ht N9923-90001 User’s GuideInstrument CalibrationWhat Are My Choices of Instrument Calibration?What Are My Choices of Instrument Calibration?The following types of instrument calibration are available from KeysightTechnologies service center:Keysight Calibration Includes the test data from the calibration and thecertificate of calibration, stating the instrument has beencalibrated and is operating within the publishedspecifications.ANSI Z540CalibrationIncludes the test data from the calibration and thecertificate of calibration, stating the instrument has beencalibrated using a process in compliance with ANSIZ540.1 and is operating within the publishedspecificationsISO 17025CalibrationIncludes the test data from the calibration and the certificate ofcalibration, stating the instrument has been calibrated using a process incompliance with ISO 17025 and is operating within the publishedspecifications.Chapter 5, “CAT (Cable and Antenna Test)Mode”, on page 75