Keysight N9923-90001 User’s Guide97DTF (Distance to Fault) MeasurementsDTF Measurement SettingsThe center frequency for the measurement is determined from thecalculated (Stop – Start) frequency values (seen on the second page ofDTF Settings):The Loss value for the measurement is in terpolated from the Freq/Loss pairs atthe Center Freq:The correction for loss at 5 meters in one direction: 0.18 dB/m * 5m = 0.9 dB.All DTF measurements correct for loss for travel down the DUT and back, sodouble the correction: 0.9 dB * 2 = 1.8 dB.Window SettingsWindow settings provide the ability to choose between optimizing DTFmeasurements for resolving closely-spaced faults or for the ability to measurelow-level faults.How to select Window settings— Press Meas Setup 4.— Then Settings.— Then press arrows to move to the Window row.— Thenpress Ed it.— Thenpress Window and choose from the following:—Maximum (Maximum – Optimized for dynamic range) the noise flooris lowered to provide the ability to measure low-level responses.(Default setting)—Med ium – Compromise between Min and Max window settings.—Minimum – Best Response Resolution, providing the ability to resolvebetween two closely-spaced responses.— Thenpress Done Ed it.— Againpress Done.Calculated Start = 2.0 MHzCalculated Stop = 3.598 GHzCenter Freq = 1.80 GHz1 GHz = 0.1 dB/m1.8 GHz = 0.18 dB/m2 GHz = 0.2 dB/m
