USER’S MANUAL. PROMAX-10
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Page 32
11/2008
4.2.3.2.3 Digital
Mode
In this mode, you can make two types of measurements. To switch between
them, you must press the rotary knob. The measurements are:
-
Input Channel Power
The digital mode shows the power level of the input channel. It is represented
by a bar graph and in numeric value (dB
µ
V). It also measures the BW (bandwidth) and
the C/N ratio (carrier / noise).
CHANNEL POWER 71dBuV
BW=9.1MHz C/N= 27dB
INTEGRATING ...
20
60
40
80 100 120
C02
CCIR
50.50MHz
Figure 31.-
- Constellation
Diagram
In this mode is shown the Constellation Diagram and other related measures
(Fig. 32).
- QAM modulation type.
- Encoding type detected.
- Symbol rate (SR).
- Error rate obtained for the Post-BER digital signal (BER after FEC) indicated
by BER
- Error rate obtained for the Pre-BER digital signal (BER before FEC) indicated
by
BER.
- Error rate of modulation (MER).
- Quadrant shown
- Locked / Unlocked
639.25MHz
QAM 32/DVB
SR= 6.875
BER: 4.8E-8
BER : 4.7E-7
MER= .28 dB
ALL Locked
Figure 32.-
To switch to the Input Channel Power, press fast and twice the rotary knob.
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