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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.
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
How to manually set Frequencies in Bandpass Mode
— Press Freq/Dist.
— Then
measurement.
— Then
measurement.
— OR
— Press More.
— Then
measurement.
— Then
for the DTF measurement.
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.
To see the frequencies that are used in the DTF measurement, press Meas
Setup 4 then
frequencies determine the exact frequency range being used.
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
3-11.
Keysight N9912-90001 User's Guide
Bandpass Mode
(Default setting) The frequency range of a DTF
measurement is set manually. Use Bandpass mode when the DUT
contains a diplexer or other filtering device which does not pass
some frequencies.
Min Start Freq
and type the start frequency to use for the DTF
Max Stop Freq
and type the stop frequency to use for the DTF
Max Freq Span
and type the frequency range to use for the DTF
Center Frequency
and type the center frequency of the range to use
Settings
then
Next
page
4-26.
Page. The calculated Start and Stop
4- 21
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