– 7871 - 7872 - 7875 - 7876 –
p.
55
Decision thresholds are used to display the measures « Power Level » and « Measurement Map »:
min threshold max threshold
Measure:
red display green display orange display
11.7 Digital measurements
In digital measurement mode, in addition to the
RF
level and to the
C/N
hereabove, the appliance also
displays the various
BER
(Bit Error Rate), the
PER
(Packet Error Rate) and the
MER
(Modulation Error
Ratio) under
DVB-T/T2/T2Lite, DVB-C/C2, DAB/DAB+, DVB-S/S2
or
DSS.
You also get the
LKM:x.xdB
(Link Margin) specification.
This expression in dB is the difference between the measured MER and the limit MER before disconnection
of the image:
it’s the security available before disconnection
.
The bargraphs are displayed with colors depending on the measured error rates:
-
GREEN: good error rates
-
ORANGE: BERo >
10
-4
(QEF : Quasi Error Free) without lost packet
-
RED: lost packets (PER).
An automatic frequency check (AFC) is automatically activated in error rate measurement
mode.
“Sync ?”
displayed on screen means that the signal is absent or unlocked; check its
presence, the modulation parameters, the presence of remote power supply and the LNB
and DiSEqC parameters under satellite band.
The sign
<
before a value or error rate shows that there is no error but that 10
-X
bits have
been tested (i.e. <10
-8
means that 10
8
bits have been tested).
You can shift from terrestrial to satellite mode by:
- Changing the setup frequency
- Changing of standard
- Changing of setup (from a terrestrial to a satellite setup)
