Coupled Frequency; Cable (Correction) Specifications - Keysight Technologies C Series User Manual

Fieldfox analyzers

DTF (Distance to Fault) Measurements

DTF Measurement Settings

Typically, you will set the frequency range of the measurement to the passband

of the filter. However, you may also want to test the ability of the filter to reject

unwanted frequencies. In this case, set the frequency range to include those

frequencies which the filter may not be adequately rejecting.

How to manually set Frequencies in Bandpass Mode

1. Press Freq/Dist

When the DTF frequencies are set manually, they may not be the optimum

frequencies for measuring the distance to fault. The distance may no longer be

alias-free. Learn more about alias-free range on

These settings specify the minimum and maximum frequencies to be used for

the DTF measurement. These exact frequencies may not be used, but a

narrower frequency range may be used that will still pass through the

bandpass filter.

Coupled Frequency

When a Return Loss & DTF measurement is present, this setting allows you to

have different frequency ranges for each measurement. Learn more in

"Coupled Frequency" on page

By default, the FieldFox does NOT correct DTF measurements to account for

the inherent loss of a cable. However, to make more accurate DTF

measurements, the Cable Loss and Velocity Factor values should be

The following describes Coax Media type. However, you can create or edit

Waveguide Media Standards. Learn how in

Min Start Freq

and type the start frequency to use for the DTF

measurement.

Max Stop Freq

and type the stop frequency to use for the DTF

measurement.

Max Freq Span

and type the frequency range to use for the DTF

measurement.

Center Frequency

for the DTF measurement.

and type the center frequency of the range to use

"Waveguide Calibrations" on

Keysight N9915-90015 User's Guide