Promax TV EXPLORER II Manual De Instrucciones página 161

USER'S MANUAL. TV EXPLORER II/II+
As well as the video carrier / noise level ratio (C/N) (40.1 dB in previous figure), the
frequency or channel (depending on the tuning mode selected) and the level of the video
carrier and video/audio ratio are also shown. When representing the spectrum by means
of pressing [13] key, the NOISE cursor is automatically positioned to a side of the
carrier tuned. That is, the cursor will indicate the point where the value of the noise is
lower, whenever the C/N(AUTO) option is selected from the PREFERENCES
menu. If the C/N(MANUAL) option has been activated the frequency where noise level
will be measured will correspond to the position of the vertical discontinuous green-
coloured cursor that appears in the spectrum graph
In order to modify this frequency, press the measurement configuration
key, to accede to the CONFIGURATION menu. By turning the rotary selector [1], locate
the NOISE cursor on the position of the marker using
(see section "5.16.1 Markers") or directly enter the value of the new noise frequency by
means of option.
NOISE FREQ
70
60
50
40
30
CH:
Figure 27.- NOISE cursor. C/N (MANUAL)
When measuring channels in the satellite band or digital channels, to measure the
C/N ratio correctly, the bandwidth of the channel must be defined previously, using the
Channel BW option on the Measurements Configuration menu that appears when
pressing the [17] key.
12/2013
[13].
NOISE FREQ. TO MARKER
FREQ: 650.00
C/N REF: 16.5 dB
43 SPAN:
[22]
[17]
option
MHz
32 MHz
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