Promax PROLINK-4C Manual De Instrucciones página 122

The PROLINK-4C includes the main TV standards: M, N, B, G, I, D, K and L,
adopting, apart from the characteristic parameters of the standard, the correcting
automatic system to obtain in all the cases an accurate measuring of the input signal
level. It admits any TV system (PAL, SECAM and NTSC) and allows the user to work
directly with digital TV signals decoding them, so that the television image may be
viewed, and directly measuring the power, carrier/noise ratio (C/N), the bit error rate
(BER) and the modulation error ratio (MER) of the digital signals. It is also capable of
analysing the MPEG-2 / DVB Transport Stream and identifying received Wrong
Packets. Being a multistandard instrument, it can be efficiently used in any country of
the world. Its accuracy and reliability meet the needs of the most demanding users.
A powerful microprocessor automatically handles a large part of the operations
necessary to optimise the process of measurement; for example, continuous frequency
synthesis, measurement correction, the appropriate selection of the attenuators and the
automatic cut-off after the device has been inactive for a certain period of time.
The signal level measured is indicated numerically in absolute values and,
optionally, on an analogue bar shown superimposed on the monitor image, that
facilitates the detection of the maximum level. Moreover, in the LV sound mode, the
loudspeaker emits a tone whose frequency depends on the level of the signal received,
which is very useful when installing antennas. It is also possible to display on screen the
line synchronism pulse like on an oscilloscope screen.
The Spectrum Analyser mode enables all the signals on a band to be viewed
on the monitor at the same time to measure analogue channels level, C/N ratio
referenced to a noise frequency defined by the user and digital channels power using
an integration method. The bandwidth of the measuring filter can be modified to
improve frequency resolution. This is an indispensable feature, as high channel density
is present on all transmission systems today. Spectrum display can be varied between
full span (the entire band) and 8 MHz terrestrial or 32 MHz satellite. In addition, there
are two markers in order to locate and list frequencies, to read signal level and
frequency difference, and the level between both.
The PROLINK-4C incorporates a specific function to test satellite signals
distribution networks. The use in combination with a IF generator allows to carry out an
easy verification of the installations before the operation beginning.
The selection of sound subcarrier is automatic, depending on the standard, or
tunable between 4 and 9 MHz. When decoding TV sound it is possible to choose
between the NARROW and WIDE filter to obtain the best carrier discrimination. It
includes a NICAM decoder (with BER measurement); the possibility to commute the
channel that is delivered to the loudspeaker enables the user to check the sound stereo
and dual.
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USER'S MANUAL. PROLINK-4C
02/2003