230 Chapter 3
Mode
Distance To Fault
Mode
Units
Use this key to specify whether all your measurement distances are given in meters or in
feet.
Meas
In the Stimulus Response mode, Meas accesses a menu of keys associated with the
Stimulus Response mode. This section describes the menu keys available with
Distance to
Fault
measurement.
To configure measurement settings, select
Distance to Fault and then press Meas Setup.
Use
Control/Sweep to restart the currently selected measurement and change the sweep
points. To select between continuous or single measurements, press the
Cont or Single
front-panel keys. For information about controlling sweep, refer to “Control/Sweep” on
page 98.
Making Distance to Fault Measurements
Measuring Distance to Fault A signal is transmitted from the RF OUTPUT connector of the
spectrum analyzer to the cable-under-test. The signals reflected from faults in the cable
are received by the spectrum analyzer.
In performing this measurement, the spectrum analyzer uses frequency domain
reflectometry. The changing interference of the transmitted and reflected signals contains
information about the distance to one or more faults. This information can be used to find
the physical distance to the faults. The distance displayed on the spectrum analyzer is the
physical distance to the probable faults, corrected for the cable loss and propagation factor
of the cable.
Measured Distance - the Effects of Frequency and Points It is not always obvious how
frequency range affects measured distance and resolution, and it often appears to be
counter-intuitive. If you are new to making Distance to Fault measurements, this section
will help clarify what is happening.
Mode Stimulus / Response
Range Feet | Meters
Key Path
FREQ/Channel, Units
Mode Stimulus / Response
Range Two Port Insertion Loss | One Port Insertion Loss | Return
Loss | Distance to Fault
Key Path Front-panel key
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