FIELD METERS MCT 080 / 081 / 082 / 085 USER MANUAL
p.
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10.5 Thresholds
Predefined thresholds are used to assess if the measurement is pertinent.
Standard
Min
Max
Analogical terrestrial TV
57
74
DVB-C/C2, J83B
57
74
DVB-T/T2
35
70
DAB-DAB+
35
70
FM, carrier
50
66
Analogical satellite TV
47
77
DVB-S, DSS
47
77
DVB-S2
47
77
min threshold max threshold
Decision thresholds are used to display the measures « Power Level » and « Measurement Map »:
10.6 Digital measurements
In digital standards, in addition to the
RF
level and to the
C/N
hereabove, the appliance also displays :
-
different BER (Bit Error Rate): ratio false bits / transmitted bits
-
the Packet Error Rate (PER): ratio false packets / transmitted packets
-
the MER (Modulation Error Ratio): digital signal-to-noise ratio
-
LKM (Link Margin): difference between measured MER and MER before unlocked
(this is the margin available before unlocking.)
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.
