Coupled Frequency; Cable (Correction) Specifications - Agilent Technologies N9913A User Manual

 Press Meas Setup 4
 Then
 Choose one of the following:
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.
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 page 37.
How to manually set Frequencies in Bandpass Mode
 Press Freq/Dist
 Then
 Then
 OR
 Press
 Then
 Then
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 on page 27.

Cable (Correction) Specifications

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 considered.
NOTE The following describes Coax Media type. However, you can create or edit
Waveguide Media Standards. Learn how on page 76.
DTF (Distance to Fault) Measurements
Frequency Mode
The frequency range of a DTF measurement is set
Lowpass Mode
o
automatically based on the Start and Stop Distances. Use Lowpass mode
when the DUT is a cable ONLY.
(Default setting) The frequency range of a DTF
Bandpass Mode
o
measurement is set manually. Use Bandpass mode when the DUT contains a
diplexer or other filtering device which does not pass some frequencies.
and type the start frequency to use for the DTF
Min Start Freq
measurement.
and type the stop frequency to use for the DTF
Max Stop Freq
measurement.
More
Max Freq Span and type the frequency range to use for the DTF
measurement.
Center Frequency
the DTF measurement.
and type the center frequency of the range to use for
33