Design And Operation Overview; Principle Of Operation; Component Arrangement - Planar IT-100 Operating Manual

Multisystem tv analyzer

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signal level, DVB-C/T/T2/S/S2 and ITU-T J.83 annex A,B,C digital and analog signal

parameters. It also enables measurements of optical signal power and fiber-optic cable

network parameters.

The Analyzer can be used both in laboratory, powered by an external power source,

and in field, powered by batteries.

2.6. Design and Operation Overview

The IT-100 Multisystem TV Analyzer is basically a TV signal receiver demodulating

signal to MPEG transport stream. If the transport stream is encrypted, it is restored by a

CAM-module and decoded into TV picture and sound. The input tuner is a double-

conversion superheterodyne receiver with manual and automatic frequency adjustment.

Modulation error ratio MER and constellation diagram are measured during demodulation

of quadrature signal based on vector analysis. Bit error ratio BER in digital transport

stream is measured by means of analysis of operation of noise immune convolutional

codecs. Radio signal measurement is performed by means of conversion of analog RF

signal into digital sequence using ADC and its further processing using signal processor

based on discrete Fourier transformation. The principle of operation of spectrum analyzer

is based on serial or parallel method of analysis with spectrum indication on display.

The resulting image is displayed on LCD in the measurement mode of digital and

analog TV signals reception quality parameters and is basically numerical values and

graphical representation of measured digital parameters (modulation error ratio and bit

error ratio). The constellation diagram mode features vector structure of quadrature

components of demodulated signal with digital modulation in the phase plane. The

spectrum analyzer mode displays the tested signal amplitude to frequency dependence

chart. The TV channel radio signal level measurement mode displays numeric value of

signal level, video carrier to audio carrier level ratio and carrier to noise ratio in the

distribution channel for analog channels or signal power in the channel band for digital

modulation signals.

The IT-100 Analyzer is implemented in plastic shockproof sectional housing with

rubber-coated protective elements and includes printed and three-dimensional wiring.

The front panel of the Analyzer consists of a keypad, a graphical display and battery

charge and external power source status indicators (figure 2.2). A loudspeaker (1) and a

fold-out support (2) are located on the rear panel (figure 2.3) of the Analyzer.

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