Digital Tv: Measuring The Power Of Digital Channels - Promax TV EXPLORER HD ISDB-T/T B Manual De Instrucciones

USER'S MANUAL TV EXPLORER
In order to measure digital channel C/N ratio it is indispensable to tune channel at
its central frequency.
In the case of the presence of adjacent digital channels, these could mask the noise
level measurement.

5.14.6 Digital TV: Measuring the Power of Digital Channels

The TV EXPLORER
measure the power of digital channels. The extrapolated approach makes an
approximation to a specific power value according to some known power values, so that
it measures channel power in the bandwidth of the measuring filter and estimates the
total channel power assuming that the spectrum density is uniform over the entire
bandwidth of the channel. The integrated approach gives the true RMS value for any
signal.
On selecting the CHANNEL POWER measurement mode, the screen displays the
following information:
In addition to the power of the digital channel (67.0 dBμV in previous figure) this
also shows the tuning frequency or channel, depending on the tuning mode selected,
and the offset frequency to calculate the digital channel power and the deviation
frequency of the central tuning calculated by the demodulator, measurement that
indicates the adjustment in the channel tuning.
For the power measurement of a digital channel to be correct it is essential to have
previously defined the channel bandwidth using the Channel BW option, in the
Measurements Configuration menu that appears when pressing
10/2012
HD ISDB-T/T
B
HD ISDB-T/T allows the user to select between two ways to
B
Figure 30.- Digital channel power measurement.
IMPORTANT REMARK
[17] key.
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