SDA-4040D STEALTH DIGITAL ANALYZER
4
Hum measurement: in-service
Measuring hum on a channel (non-scrambled) is as simple as pressing the
“HUM” key and since the instrument is battery powered, the measurement is
independent of ground loops, therefore isolated from the line (mains). Hum
reveals itself as either single (60 Hz) or double (120 Hz) horizontal bars across the
video screen. The level of either can be measured.
Modulation measurement
The Navigator user interface, common on all JDSU
SDA meters
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.
Extensive automated test capability
Automated tests can be scheduled to perform either 24-hour FCC compliance
tests, or initiated immediately to log performance at individual nodes, amplifiers
or other testpoints. A wide range of tests can be performed automatically,
including signal levels, C/N, hum and depth of modulation. The operator desig-
nates which tests to perform on which channels. Because these tests are non-
intrusive, it is easy to test all parameters on all channels at any time.
The single-channel level display shows both video and
audio levels (either single or dual sound/NICAM) and
the difference between the two
After a test is performed, the results can be displayed on the SDA screen. A
pass/fail indication can be set on a variety of limits for FCC/CENELEC or other
government standards, or to system preferences. Data taken during any auto-
mated test, or sequence of automated tests, can be viewed immediately 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.
Data analysis with StealthWare
Digital channel average power measurements can be
made using the digiCheck™ feature
Any stored SDA measurement information can be uploaded to a PC using
StealthWare, a Microsoft® Windows®-based data management package. Stored
sweep, scan, or spectrum screens can be viewed on the PC and analyzed with
marker movement and readout information in just the same way as on the actual
instrument. A sweep graph overlay function enables comparison of multiple RF
response variations over time. StealthWare also allows the operator to build
channel plans and edit site locations, which can be downloaded to multiple SDA
instruments. Additionally, channel plans can be uploaded to the PC, modified in
StealthWare, and then downloaded back to the SDA instrument.
Upgrading the SDA-4040D to the SDA-5000
Tilt mode performs automatic tilt calculations
between any two of nine designated carriers
The JDSU upgrade program is designed to protect customers’ investment in test
equipment. As system requirements change, the SDA-4040D can be upgraded to
the SDA-5000 for forward and reverse sweep capabilities at any of JDSU
worldwide service centers, and model SAM-4040D owners can upgrade to the
SDA-4040D with an in-the-field firmware change only.
JDSU [ JDS UNIPHASE CORPORATION ]
