SDA-5000 SERIES STEALTH DIGITAL ANALYZER
6
Tilt measurement
Tilt is the easiest and most efficient tool for balancing amplifiers. For cable plants
requiring multiple tilt measurements, such as comparing today’s tilt measurement
with a historical record and then making an additional measurement for a new
wider channel plan, the technician simply uses markers to indicate the tilt
channels that define the new limits with the SDA Series.
Intermodulation distortion
Tilt mode performs automatic tilt calculations
between any two of nine designated carriers
Intermodulation distortion (CSO/CTB) can be automatically measured using the
CTB/CSO mode from the spectrum analyzer. CTB/CSO distortions produced by
intermodulation of analog TV carriers can degrade the signal quality of QAM
modulated signals used by digital video and cable modems.
Scan measurement
The SDA Series Scan mode provides a quick graphical view of the entire channel
plan with bars representing the video level for each channel. Both video and audio
may be displayed.
Carrier-to-noise measurement: in-service
Limit checks can be instantly viewed after identifying
channel of interest with a marker in Scan mode
display
Carrier-to-noise measurements (on a non-scrambled channel) is just as easy with
the SDA Series and there is no need to remove modulation from the video carrier.
No tunable preselector filter is needed.
Hum measurement: in-service
Measuring hum on a channel (non-scrambled) is as simple as pressing the
“HUM” key with the versatile JDSU SDA Series. Since the instrument is battery
powered, the measurement is independent of ground loops and is, therefore,
isolated from the line (mains). Hum is revealed as either single (60 Hz) or double
(120 Hz) horizontal bars across the video screen.
Modulation measurement
In-service carrier-to-noise
SDA Series modulation measurements include 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.
Local amplifier alignment w/loopback tests
The SDA Series’ loopback tests enable the technician to perform frequency
response measurements of active or passive field devices. Either a CW or sweep
signal may be generated from the SDA instrument 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
loopback test is available on the SDA-5000 with option 1. The CW loopback and
sweep loopback features are available on the SDA-5000 with option 2.
JDSU [ JDS UNIPHASE CORPORATION ]
