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

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

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

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.

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SDA-5000 SERIES STEALTH DIGITAL ANALYZER

Tilt mode performs automatic tilt calculations

between any two of nine designated carriers

Limit checks can be instantly viewed after identifying

channel of interest with a marker in Scan mode

display

In-service carrier-to-noise