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Triggering
on
a
Selected
Line
of
a
Video
Picture
Field
You can trigger on a TV picture carrier signal. This example enables you to
view a test signal transmitted during vertical retrace when the TV screen is
blanked.
1. Press
[PRESET].
2. Set the frequency of a picture carrier signal to center frequency.
3.
Press (TRIG) and TV TRIG If the spectrum analyzer is in a nonzero span,
TV
TRIG sets the amplitude scale to linear, places a marker on the signal
peak, moves the marker to the reference level, changes the detector to
sample, sets the sweep time to 100
ps,
sets the resolution bandwidth
to 1 MHz, and sets the span to 0 Hz. The TV line number is the active
function. The preset function sets the spectrum analyzer to trigger on an
odd field of a video format and TV line number 17.
The sweep time of 100
,DS
allows you to view two TV lines, line 17
and part of line 18. The multiburst is on TV line number 17, and the
composite is on TV line number 18.
fb
MKR
85
000
vsec
I
CENTER
67.250
MHZ
SPAN
0
HZ
IRE5
BW
I
MHz
VBW
300
kHz
#SWP
100
Lsec
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Figure 5-13. Triggering on an Odd Field of a Video Format
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