3-6 Option 100 Fault Location and SRL
Making Fault Location Measurements
How to Make and Interpret Fault Location Measurements
3. Calibrate the Analyzer
When practical, a calibration should be done at the measurement
reference plane using open, short, and load calibration standards to
correct the instrument and optimize accuracy. If calibration standards
are not available, the default instrument calibration can be used.
NOTE Most fault location measurements are made by connecting the cable
under test directly to the analyzer's RF OUT (or PORT 1) test port. In
this case the measurement reference plane would be the analyzer's port
and you would connect calibration standards to the RF OUT (or PORT 1)
test port as shown in Figure 3-1. Fault location measurements may also
be made using a test lead cable. If this is the case, the measurement
reference plane would be the end of the test lead cable as shown in
Figure 4-1 on page 4-5, and calibration standards would be connected to
the end of the test lead cable.
Entering Calibration Parameters
If fault location is already selected as the type of measurement, press
and then enter the velocity factor and cable loss parameters. The
value for cable loss should correspond to the center frenquency of the
range used for the fault measurement.
Band Pass Mode This mode is called bandpass because it works with band-limited
devices. Stimulus frequencies are limited to the range specified by the
setting and the (in
the fault loc frequency menu) setting. For example, bandpass mode
should be selected for measurements on systems which can operate
only over narrow specified frequency ranges.
In this mode, the frequency span for the fault measurement cannot
exceed the setting.
Center Frequency This parameter is only used with band pass mode.
Sweep Time When making fault location measurements, the sweep time is set
automatically based on the stop distance setting you have chosen.
Sweep time may be entered manually, however, using the
key.
Parameter Comments
SWEEP
CAL
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