Mode com MC-2050 Manual de instrucciones

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MC-377 INSTRUCTION MANUAL
LEVEL METER FOR ANALOGUE AND
DIGITAL TV
MC-377
1 GENERAL
1.1 Description
The
MC-377
is a compact, light-weight, portable instrument which offers installers
all the basic functions needed to guarantee the good operation of
analogue and digital
TV
installations.
The instrument covers
television bands, hyperband, cable television S channels
as
well as the
satellite
intermediate frequency band in K/C, up to 2050 MHz.
The
MC-377
has two main operation modes:
Monitor
mode and
Spectrum Analyser
mode:
The
Spectrum Analyser
mode enables all the signals present in a band to be viewed
on the monitor. The bandwidth represented in the spectrum mode can be selected as
either the complete band or a bandwidth defined by the user (from approximately 1/3
of the band in use to almost zero).
In the
Monitor
mode the instrument demodulates the analogue TV signal, which
enables a terrestrial or satellite television channel to be identified and its reception
observed. The signal level in monitor mode is represented by an analogue bar at the
top of the image whose length varies in proportion to the power received. In addition it
enables the line synchronism pulse to be observed, overlaid on the top centre of the
screen.
The
MC-377
enables you to easily take the following measurements:
analogue
signal levels
,
digital channel power
and
Carrier to Noise ratio (C/N)
in analogue and
digital channels.
The instrument can also supply the voltage needed to power external units: aerial
pre-amplifiers and LNBs with 13 or 18 V, together with a 22 kHz signal superimposed
onto the voltage for the commutation of polarisation, band or signal switches.
September 1999 Page 1
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Indice de contenidos

Pagina 1 - DIGITAL TV

MC-377 INSTRUCTION MANUALLEVEL METER FOR ANALOGUE ANDDIGITAL TVMC-3771 GENERAL1.1 DescriptionThe MC-377 is a compact, light-weight, portable instrumen

Pagina 2 - 1.2 Specifications

MC-377 INSTRUCTION MANUAL3.1.1 Selecting the mains operating voltage This equipment requires a mains power source of 110-125-220 or 230/240 V AC50 to

Pagina 3

MC-377 INSTRUCTION MANUAL3.2 Operating on the batteryThe MC-377 is a portable device powered by a 12 volt internal battery. Before takingany measureme

Pagina 4

MC-377 INSTRUCTION MANUALPage 12 September 1999

Pagina 5

MC-377 INSTRUCTION MANUAL4 OPERATING INSTRUCTIONS4.1 Description of the controls and elementsFront panelFigure 2.- Front panel.[1]MONITOR[2]Noise Limi

Pagina 6 - Page 6 September 1999

MC-377 INSTRUCTION MANUAL[5]MON./SPEC Operating mode selector:Pressed key (MON.): Monitor Mode. The monitor [1] shows the demodulated TVsignal corres

Pagina 7 - 2 SAFETY RULES

MC-377 INSTRUCTION MANUAL[19]SATSatellite IF RF input and external unit powering (LNB) 0/13/18 V + 22 kHz.[20]DRAINLuminous indicator showing the exte

Pagina 8 - 2.2 Specific precautions

MC-377 INSTRUCTION MANUAL[27]Audio control and activation of the measurement information over theimage: Pressed control: Selects television sound demo

Pagina 9 - 3 INSTALLATION

MC-377 INSTRUCTION MANUAL4.2 Using the level meter4.2.1 Start-upPress the I/O control [3]. The frequency counter display [22] will show the tunedfrequ

Pagina 10 - CAUTION

MC-377 INSTRUCTION MANUAL4.2.3 Spectrum Analyser operating modeThe Spectrum Analyser operating mode enables you to be easily and quickly informedon th

Pagina 11 - IMPORTANT

MC-377 INSTRUCTION MANUALIn the complete band Spectrum Analyser mode (MAX, with the SPAN/MAX key [6]released) a white horizontal line will appear on t

Pagina 12 - Page 12 September 1999

MC-377 INSTRUCTION MANUAL1.2 Specifications TUNINGVHFLOW VHF band (VLO) from 48.25 to 168.25 MHzHIGH VHF band (VHI) from 175,25 to 447.25 MHzUHFUHF ba

Pagina 13 - 4 OPERATING INSTRUCTIONS

MC-377 INSTRUCTION MANUAL4.2.4 Monitor operating modeIn the Monitor operating mode the MC-377 works like a conventional television. Inaddition, when t

Pagina 14 - MC-377 INSTRUCTION MANUAL

MC-377 INSTRUCTION MANUAL4.2.5.1 Measuring the level of analogue signalsTo measure the level of an analogue signal, proceed as described below:- Selec

Pagina 15

MC-377 INSTRUCTION MANUALEXAMPLE A. Measuring the level of an analogue signalTake the following figure as an example, showing a television channel: th

Pagina 16 - CH POWER

MC-377 INSTRUCTION MANUAL4.2.5.2 Measuring the power of digital channelsThe main characteristic of digital signals is that they distribute their energ

Pagina 17 - 4.2.2 Preliminary adjustments

MC-377 INSTRUCTION MANUALEXAMPLE B.- Measuring the power of a digital signalTake the following figure as an example, showing a digital signal: Measure

Pagina 18

MC-377 INSTRUCTION MANUAL4.2.5.3 Measuring the C/N ratio of analogue and digital signalsMeasuring the Carrier/Noise ratio provides us with information

Pagina 19

MC-377 INSTRUCTION MANUALEXAMPLE C.- Measuring the C/N ratio of an analogue signalTake the following figure as an example, showing an analogue televis

Pagina 20 - 4.2.5 Taking measurements

MC-377 INSTRUCTION MANUAL4.2.5.3.2 Measuring the C/N ratio of digital channelsThe C/N ratio of digital channels is measured in a similar way to analog

Pagina 21 - VERY IMPORTANT

MC-377 INSTRUCTION MANUALPage 28 September 1999

Pagina 22

MC-377 INSTRUCTION MANUAL5 MAINTENANCE 5.1 Operating recommendationsOne of the more common causes of breakdowns in TV signal level meters is thegenera

Pagina 23

MC-377 INSTRUCTION MANUALScales range60 dB for TV analogue signals45 dB for TV digital signals40 dB for SAT analogue signals30 dB for TV digital signa

Pagina 24

MC-377 INSTRUCTION MANUAL5.3 Battery replacementThe battery should be replaced when you notice that its capacity, once it has beencharged, has decreas

Pagina 25

MC-377 INSTRUCTION MANUAL5.4 Cleaning recommendationsCAUTIONTO CLEAN THE COVER, TAKE CARE THE INSTRUMENT IS DISCONNECTED.CAUTIONDO NOT USE SCENTED HYD

Pagina 26

MC-377 INSTRUCTION MANUALPage 32 September 1999

Pagina 27

MC-377 INSTRUCTION MANUALAPPENDIX A. DIGITAL TV SIGNALSTerrestrial Digital Television (abbreviated as TDT) uses COFDM modulation (CodedOrthogonal Freq

Pagina 28 - Page 28 September 1999

MC-377 INSTRUCTION MANUALMEASURING THE POWER OF DIGITAL CHANNELSAs we have already mentioned, digital signals distribute their energy uniformly across

Pagina 29 - 5 MAINTENANCE

MC-377 INSTRUCTION MANUALTABLE OF CONTENTS1 GENERAL... 11.1 Description ...

Pagina 30 - 5.3 Battery replacement

MC-377 INSTRUCTION MANUALSpectrum Analyser ModeBandwidthMAX modeSpectrum of the entire selected band, with amarker on the tuned frequency.SPAN modeFre

Pagina 31 - 5.4 Cleaning recommendations

MC-377 INSTRUCTION MANUALOPERATING ENVIRONMENTAL CONDITIONSAltitudeUp to 2000 mTemperature marginFrom 5 ºC to 40 ºCMax. relative humidity80% (up to 31

Pagina 32 - Page 32 September 1999

MC-377 INSTRUCTION MANUALPage 6 September 1999

Pagina 33

MC-377 INSTRUCTION MANUAL2 SAFETY RULES 2.1 General* Use this equipment connected only to devices or systems with their negative ofmeasurement connect

Pagina 34

MC-377 INSTRUCTION MANUAL* Symbols related with safety:DIRECT CURRENTALTERNATING CURRENTDIRECT AND ALTERNATINGGROUND TERMINALPROTECTIVE CONDUCTORFRAME

Pagina 35 - TABLE OF CONTENTS

MC-377 INSTRUCTION MANUAL3 INSTALLATION The MC-377 level meter is designed for use as a portable device. A carrying caseis supplied to simplify transp

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