Digital Tv: Measuring Ber; Itu-T J.83/B Signals - Promax US TV EXPLORER 2 User Manual

USER'S MANUAL. US TV EXPLORER II

5.14.7 Digital TV: Measuring BER

The US TV EXPLORER II offers three ways to measure the bit error rate (BER) of
digital signals depending on the type of used modulation.
To select the BER measurement mode:
1) Select digital signals Measurements Configuration pressing
2) Select by means of Signal option from CONFIGURATION menu: ITU-T J.83/B
for the measurement of QAM Annex-B modulated signals, ATSC for the
measurement of 8-VSB modulated signals or DVB-S/S2 or DSS for the
measurement of QPSK/8PSK modulated signals. Available frequency ranges are:
3) Enter the parameters relative to the digital signal which appear in the
measurement CONFIGURATION menu, as described previously.
4) Select the option to exit from measurements CONFIGURATION menu.
5.14.7.1

ITU-T J.83/B signals

Once determined the parameters of QAM Annex-B signal, it will be possible to
measure BER, press the
In the BER measurement mode, the monitor will show a display like the following
one:
-8
FREQ:
CH:
Figure 30.- Screen of BER measurement of QAM Annex-B signals.
The BER measurement before error correction is shown: BER before FEC
(Forward Error Correction).
10/2007
[12] key until the BER measurement display appears.
-7 TOV -5 -4 -3
213.00 MHz C/N: 16.5
-3 kHz POWER: 66.2
A13 MER: 24.7
» BER:
[17] key.
-2
dB
dBµV
dB
5.6E-7
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