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11.4.3
Thresholds
Predefined thresholds are used to assess if the measurement is pertinent.
min 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
been tested (i.e. <10
7849B – 7859B – 7817B
Standard
Terrestrial analog TV
DVB-C/C2
DVB-T/T2
DAB-DAB+
FM, Carrier
Satellite analog TV
DVB-S, DSS
DVB-S2
-8
8
means that 10
bits have been tested).
Min
Max
57
74
57
74
35
70
35
70
50
66
47
77
47
77
47
77
max threshold
p.
52
-X
bits have
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