CATV Measurements
2715 User Manual
5–69
To view field modulation, press [1]. The center frequency is set to the visual
carrier frequency of the selected channel, zero span is enabled, the sweep rate is
set to 2 ms/division, the resolution bandwidth is set to 1 MHz, and the readouts
are turned off.
You should see at least one field of the video signal.
This operation allows you to view one line of demodulated video for the current
channel in the analog mode.
The setup is the same as for field modulation except that the 2715 sets the sweep
time to 10
µ
s/div and the trigger mode to TV Line trigger.
The line to trigger on is set to the VITS line specified in the channel table. If no
VITS line is specified, then line 17 is selected.
The FREQ/MKRS knob is assigned to video line. This lets you select the line to
trigger on. Thus you can display any line in the field for viewing by using the
knob.
To view line modulation, press [CATV/APPL] [2]. The center frequency is set
to the visual carrier frequency of the selected channel, zero span is enabled, the
sweep rate is set to 10
µ
s/division, the resolution bandwidth is set to 5 MHz, and
the readouts are turned off.
If a VITS line is specified in the channel table, you should see that VITS line. If
a VITS line is not specified, then you should see line 17 of the video signal. If
you wish to change the displayed line, press [READOUT] and turn the
FREQ/MKRS knob to select the desired line; then turn off the readouts.
View Picture provides demodulation of the video carrier on the current channel.
The instrument sets up for the video demodulation mode on the current channel
with the following settings:
Frequency
1.5 MHz above Visual Carrier
Reference Level
Set for viewable picture
Span/Div
Zero Span
Sweep Time
5
m
s/Div
Resolution Bandwidth 5 MHz
Both NTSC and PAL video channels are supported. The instrument stays in this
mode until the mode is deselected, the channel is changed, or another test is run.
Item 3 in the DEMOD menu (BROADCAST <AM> VIDEO) is displayed as
ON any time VIEW PICTURE is enabled.
Line Modulation
View Picture
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