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13.2. TV & CATV Special Functions
For Terrestrial and Cable TV HD PRO TAB provides some specific tool able to verify the
correctness of the aerial and cables installation. One of those tools is the
Buzzer and Noise
Margin
already described in the preceding paragraph. The other tools are:
ATTENUATION TEST (TV):
When a signal distribution system is installed it is often necessary
to verify that all ends receive the same signal strength, to be sure that there are no leaks or
other propagation issues. Typically, the technician switches on at one end a small carrier
generator which injects three CW tones having known level.
The meter's attenuation test, activated at another end of the distribution, starts doing a
frequency sweep to detect those carriers and record their frequencies and signal levels as
reference (
calibration mode
). Once the calibration has finished, the user could store those
carriers in a special PLAN (MANUxx) that can be later recalled in the measurement interface to
perform comparative measurements at the other ends of the distribution system.
LEAKAGE (CATV):
Aim of this test is to provide a tool with which a technician can verify the
presence of any signal leak in a distribution system. The user can configure the antenna type,
the antenna gain, the distance between the meter and the distribution system under test and
the threshold above which the measured signal should be considered as a leak:
Summary of Contents for HD PRO TAB
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