7849B
– 7859B – 7817B
p.
52
11.4.3
Thresholds
Predefined thresholds are used to assess if the measurement is pertinent.
Standard
Min
Max
Terrestrial analog TV
57
74
DVB-C/C2
57
74
DVB-T/T2
35
70
DAB-DAB+
35
70
FM, Carrier
50
66
Satellite analog TV
47
77
DVB-S, DSS
47
77
DVB-S2
47
77
min threshold max threshold
11.5 Digital measurements
In digital measurement mode, in addition to the
RF
level and to the
C/N
here above, the appliance also dis-
plays 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, 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
.
“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).
