Atec Wavetek-SDA-5000-5500-5510 - Manual (Page 6)

Carrier-to-Noise Measurement: In-Service
Taking carrier-to-noise measurements (on a non-scrambled
channel) is easy. There is no need to remove modulation from
the video carrier, and a tunable preselector filter is not needed.
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Hum Measurement: In-Service
Measuring hum on a channel (non-scrambled) is as simple as
pressing the "HUM" key. Since the instrument is battery pow-
ered, the measurement is independent of ground loops and is,
therefore, isolated from the line (mains). Hum is revealed as as
either a single (60 Hz) or double (120 Hz) horizontal bars
across the video screen. The level of either can be measured.
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Modulation Measurement
Includes NTSC, PAL, and SECAM formats. Demodulation
of the audio is done for both AM and FM. FM is used to
hear audio distortion on the FM radio channels or the
sound of the TV program. AM is used to recognize short-
wave interference signals in the reverse band.
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Local Amplifier Alignment w/Loopback Tests
The SDA loopback tests allow the technician to quickly per-
form frequency response measurements of active or passive
field devices using a single meter. Either a CW or sweep sig-
nal may be generated from the SDA unit and injected to the
input of a device under test. The DUT output can then be
measured by the SDA, providing valuable information such
as gain, loss, roll-off, or frequency response. The CW loop-
back test is available on the SDA-5000 when ordered with
OPT 1. The CW loopback and sweep loopback features are
available on the SDA-5000 when ordered with OPT 2.
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Extensive Automated Test Capability
Automated tests can be scheduled to perform either 24-hour
FCC compliance tests, or initiated immediately to log perfor-
mance at individual nodes, amplifiers, or other testpoints. A
wide range of tests can be performed automatically, includ-
ing signal levels, C/N, hum, and depth of modulation. The
operator designates which tests to perform on which chan-
nels. Because these tests are non-intrusive, it is easy to test all
parameters on all channels at anytime.
After a test is performed, the results can be displayed on the
SDA screen. A pass/fail indication on a variety of limits can
be set for FCC/CENELEC or other government standards,
or to system preferences. Data taken during any automated
test, or sequence of automated tests, can be viewed immedi-
ately with a pass/fail indication for each of the limits.
Specific stored measurement results may be viewed on
demand. Automated test results can be printed directly to a
serial printer or uploaded to a PC using StealthWare to
store and include in custom reports.