Promax 10 SE, Руководство пользователя

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Premium USER’S MANUAL. PROMAX-10
11/2008 Page 35
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Press CONFIG again to CONFIGURATION next page 2/2.
ANNEX ITU-T : System used according to the
country. Possible values are
DVB, B or C.
CONFIG QAM: 2/ 2
QAM Modulation : It is the QAM modulation used.
Selectable values are 16, 32,
64, 128 or 256.
Figure 37.- CONFIG QAM .2/2.
Symbol Rate : It is the rate of symbols
sent. The range is from 1000 to 7000.
Attenuation : It is the level of attenuation applied on the output. It could
work in automatic mode or in a range from 0 to 60 dB.
Quadrant : To select what constellation quadrant you want to view: ALL,
Q1, Q2, Q3, Q4, Q1+, Q2+, Q3+, Q4+.
Remark: When switching from frequency to channel, if the tuned frequency does
not correspond to any channel, the PROMAX-10 Premium will search for
the channel nearest to this frequency and will stay tuned to this
channel. This operation may take a few moments.
4.2.4 SPECTRUM ANALYSER operating mode.
Pressing the key the unit switches to the SPECTRUM ANALYSER mode.
This function has 4 different operating modes (SPECT, MAX, MIN and TRANS), which are
selectable through the spectrum mode configuration menu (see section 4.2.4.5).
Figure 38.- SPECT mode.
4.2.4.1 SPECTRUM operating mode.
In the SPECTRUM mode, the PROMAX-10 Premium provides a spectral
analysis of the band; the span and the reference level are variable. The spectral
analysis can be done in the
forward band or in the
return path as it is selected in the spectrum
configuration menu (section 4.2.4.5); this menu also
allows to select the
detector used for the
representation of the spectrum between peak and
average .
The marker frequency is displayed in the
higher left hand corner of the screen
(650.00 MHz) and, to its right, the frequency signal level (34 dBµV). To alter the marker
frequency turn the rotary selector [9].