Digital Tv: Measuring Mer - Promax US TV EXPLORER II Manual De Uso

MPEG-2
Correct detection of a MPEG-2 signal.

5.14.8 Digital TV: Measuring MER

Once determined the suitable parameters for 8-VSB, QAM Annex-A ,QAM
Annex-B or QPSK/8QPSK signal reception, it will be possible to measure MER, press
[12] key until it appears the MER measurement screen.
0
FREQ:
CH:
MPEG-2
Figure 44.- Screen of MER measurement of ATSC (8-VSB) signals.
First of all, you will see the modulation error ratio measurement: MER.
Following, it appears the Noise Margin (NM) measurement (in the figure value
8.4 dB). It indicates a safety available margin according to the MER level measured that
allows signal degradation until arriving to the TOV (Threshold of Visibility) or QEF (quasi
error free) limit value.
0
FREQ:
DL-Ku:
CH:
MPEG-2 TS
Figure 45.- DVB-T/H (COFDM) signals MER measurement screen.
Page 62
10 20
57.00 MHz C/N:
-3 kHz POWER:
A02 » MER:
SER:
VBER:
10 20
1527.97 MHz C/N:
-637 kHz POWER:
11278.0 MHz » MER:
4 CBER:
LBER:
USER'S MANUAL. US TV EXPLORER
NM: 8.4 dB
30 40
>21.3 dB
55.8 dBµV
19.5 dB
1.0E-5
1.0E-8
LM: 2.3 dB
30 40
12.4 dB
56.8 dBµV
9.2 dB
1.5E-2
<1.0E-8
II
11/2013