User guide

47
Chapter 4 Fault Location Mode
Fault location identifies the position of impedance discontinuities
(reflections) within the antenna/feeder system. The measurement
results are displayed on an x-y graph. Distance from the Site Analyzer
is shown on the x-axis, while relative magnitude of the discontinuity is
shown on the y-axis.
Before you make a fault location measurement, be sure that you have
the following items and information:
• A Bird Calibration Combination (Cal Combo) calibration unit
• All necessary cables and adapters of the correct size and con-
nector type.
• The velocity of propagation for the cable type you will measure
(obtain from the cable manufacturer)
• Number of data points to use in making the distance to fault
measurement (user choice)
This chapter describes how to make a fault location measurement and
provides step by step instructions. In addition, this chapter also
describes how to set and move markers. For information and instruc
-
tions to save and recall traces, refer to Save and Recall, page 79.
To make a fault location measurement, follow the procedures in this
chapter in the order they are presented.
Determine the Power of the Component Being Tested
Use a service monitor, power meter, or spectrum analyzer to check that
the component being tested does not have power greater than +22 dBm.
CAUTION
+22 dBm max. input
Do not apply RF power to the Antenna Test Port.
Exceeding the maximum input will damage the Site
Analyzer.