AP301-FULL-HD_rev.09_UK
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8.
CONSTELLATION
This feature allows to display of the constellation diagram that refers to the modulation of
the tuned signal. Looking at the constellation can be a first qualitative assessment of the
signal.
The measure of signal quality is shown in numerical form in dB of the MER (Modulation
Error Ratio).
For a complete analysis of the signal in the screen of constellation, are found the
measurement of the MER and other quality parameters such as BER and Noise Margin.
8.1.
Use of constellation
To display the constellation diagram is need to lock the signal in digital measurements
mask.
The display of the constellation is activated as follows:
⇒
from digital measurements mask (DIGI), press the "MENU".
⇒
select the "CONST" from list of features, press "ENTER" to activate function. The
diagram of the constellation is displayed on the monitor.
⇒
pressing the "MENU" open the functions:
I.
EXIT: returns to the digital measurements mask.
II.
QUAD: choice of a single quadrant with zoom of the same.
Turn the shaft encoder to select the desired function and press "ENTER".
If you select the QUAD function, the message flashes. Turn the shaft encoder to select
the desired quadrant of: 1,2,3,4, ALL (to see the whole of the constellation), then press
"ENTER" to confirm the selection.
