108 Keysig ht N9923-90001 User’s GuideCalibration for NA, CAT, and VVM Modes—When your DUT has high return loss such as the reject band of a filter.Then measuring the load improves accuracy. Even with the optionalLoad, phase accuracy begins to degrade when the return loss isgreater than about 20dB.— Press Skip Step in all other cases and when making DTF measurements.Measuring a load would do little to improve accuracy.Connect THRU (Not used for 1-port cals)— Connect port 1 to port 2, either by mating the connectors that attach to theDUT (Flush THRU), or by using a short jumper cable. Learn more aboutFlush THRU in “Calibration Type” on page 114. Then press Measure.— Press Finish.CAL ON Q is shown on the screen for all displayed measurements that arecorrected with QuickCal.Using QuickCal with a Long Jumper CableQuickCal requires a sufficient frequency span to adequately characterize thejumper cable (the cable between the instrument port and the DUT). If a ‘CalFailed’ error appears and you connected the optional Load standard, thenincrease the frequency span of the measurement until the error no longerappears. After the calibration, you can then decrease the frequency span asneeded and rely on interpolation. Learn more about Interpolation in“Interpolation *” on page 119.QuickCal is also limited in how much jumper cable loss it can tolerate. IfQuickCal without the Load is failing, then measure the Load during theQuickCal to see if that resolves the issue.Mechanical CalMechanical Calibration is performed using discrete standards from a Cal Kit.Several Cal Kit definitions are built into the FieldFox. To learn about Cal Kitdefinitions, refer to the Application Note, “Specifying Calibration Standardsand Kits for Keysight Vector Network Analyzers,” available online athttp://literature.cdn.keysight.com/litweb/pdf/5989-4840EN.pdfMechanical Cals are extremely accurate when performed using the correct CalKits with standards that are clean and in good repair, and when using correctconnection procedures.How to perform a Mechanical Cal— Disconnect the DUT from the FieldFox.Visit www.keysight.com/find/fieldfoxsupport to see a complete list ofsupported Cal Kits. Also at this website, download Data-Link software thatallows you to edit Cal Kit definitions or add a new Cal Kit.
