Selecting The Measurements - Promax US TV EXPLORER II Manual De Uso

5.14

Selecting the Measurements

The types of measurements available depend on the operating band (terrestrial or
satellite) and the type of signals (analogue or digital).
Terrestrial band - Analogue channels:
Level
Video / Audio
C/N
FM Deviation
Terrestrial band - Digital channels (ITU-T J.83/B (QAM Annex-B) and ATSC (8-VSB)):
Channel power
MER
SER
VBER
BER
C/N
:
NOTE The VBER measurement shown by default (when PRN-23 BER option from
Preferences menu is set to OFF) yields an estimated value calculated using
the MER measurement. In order to obtain a more accurate BER
measurement value, the PRN-23 BER option from Preferences menu must be
set to ON and a PRN-23 signal pattern must be used through the RF signal
input [30].
If the input signal is like PRN-23 or a video signal, the BER and VBER
measurement are considered as acceptable when BER/VBER ≤ 3*10E-6 and
SER-ERR/s ≤ 2 being SER value the number of wrong packets taken as
reference measurement.
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Level measurement of the currently tuned carrier.
Video carrier to audio carrier ratio.
Ratio between the modulated signal power and the equivalent
noise power for a same bandwidth. (according to TV standard)
Measure the frequency peak deviation for any modulated
analogue carrier in FM.
Channel power is measured assuming that power spectral
density is uniform throughout channel bandwidth.
Modulation error ratio measurement.
(only for ATSC) MPEG wrong packets measurement, which
have not been corrected by means of the FEC.
(only for ATSC) BER (Bit error rate) measurement for the digital
signal after the error correction (BER after Viterbi).
(only for ITU-T J.83/B and DVB-C) BER (Bit error rate)
measurement for the digital signal after the error correction
(BER after Viterbi).
Out-channel measurement. Noise level is measured at f noise =
f tuning ± ½*Channel BW. To measure it correctly digital
channel must be tuned at its central frequency.
USER'S MANUAL. US TV EXPLORER II
11/2013