90 Keysight N9923-90001 User’s GuideDTF (Distance to Fault) MeasurementsHow to make DTF MeasurementsHow to make DTF MeasurementsBefore starting, you may need the following:— Jumper cable or adapter to connect the beginning of the DUT to theFieldFox.— LOAD with correct connector type and gender to terminate the end of theDUT (if possible).— The known length and cable type of the DUT. If the cable type is not known,then the Cable Loss (dB/Meter) and Velo city Factor of the DUT are required.1. Connect any necessary jumper cable or adapter to the FieldFox RF OUTport. Do NOT connect the DUT.2. Press Preset then Preset to return the FieldFox to the default settings.3. Then Mode then CAT.4. Then Distance To Fault.5. Press Freq/Dist, then Stop Distance and enter the length of the DUT. Youcan optionally set the Start Distance6. Press Cal 5 and follow the Cal prompts. Learn all about Calibration in“How to Perform a Calibration” on page 104.7. Disconnect any components or antenna that should NOT be measured andconnect a LOAD at the end of the DUT.8. Press Meas Setup 4 then DTF Cable Specifications.9. Either press Recall Coax Cable, or directly enter the Velocity Factor/CableLoss of the DUT using the Velocity Factor and Cable Loss keys.10. Connect the start end of the DUT to the FieldFox.11. Press Meas Setup 4 then Settings then Next Page. If the Alias-free Rangesetting is False, then you may see Alias faults on the screen. Learn moreon page 98.
