Promax 10 SE, Руководство пользователя

Страница: 78 / 154

USER’S MANUAL. PROMAX-10 Premium
Page 18 11/2008
j) BER RESOLUTION
•
LOW : BER measurements every 2s. The minimum measured BER for a
signal at 64QAM and a SR at 6875 Ks/s is 10
-7
•
HIGH : BER measurements every 20 s. The minimum measured BER for a
signal at 64QAM and a SR at 6875 Ks/s is 10
-9
•
CONTINUOUS : Continuous measurements up to 30 minutes. The minimum
measured BER for a signal at 64QAM and a SR at 6875 Ks/s is 10
-11
.
The resolution selected in the configuration, applies also in the measurements
done in LOGGER mode, with the exception of the CONT mode that measures time of
20 s (in HIGH mode).
k) SW
The lower line of the screen shows the version of the unit control software
(7.06 in previous figure).
IMPORTANT
To leave the global configuration menu, just press the key of the operating mode
you wish to access.
4.2.2 SCAN operating mode
The SCAN operating mode shows, in a single screen, the signal level of all the
active channels in the channel plan by means of a bar-graph. In addition, the exact level
of any particular channel may be measured by simply placing the marker over it (the
measurement is calibrated only for analogue channels; for digital channels refer to the
note at the end of the section).
To access this mode of
operation you should press the SCAN
[11] key. At first, the field channel (C44
in the figure) will appear shaded, indicating that is
selected and modifiable. Next to the channel, it
appears the frequency (655.25 MHz in the figure)
and the level (65 dBµV in the figure) of the channel
where the marker is pointing. The marker is moved
by using the rotary knob [9].
To change the span
(bandwidth represented on the
screen), first select it by pressing the
rotary knob until you see the "sp" shade (at the
middle bottom of the screen). Then turn the rotary
knob [9]. If you rotate clockwise the span will
increase and if you rotate anti-clockwise it will
decrease.
Span can acquire the following values:
10, 30, 100, 300 MHz and full span .
Figure 8.- SCAN mode, full span .
Figure 9.- SCAN mode, span 100 MHz .