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

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.

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

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

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.

4

SDA-4040D STEALTH DIGITAL ANALYZER

The Navigator user interface, common on all JDSU

SDA meters

The single-channel level display shows both video and

audio levels (either single or dual sound/NICAM) and

the difference between the two

Digital channel average power measurements can be

made using the digiCheck™ feature

Tilt mode performs automatic tilt calculations

between any two of nine designated carriers