User`s guide

Triggering on a Selected Line of a Video Picture Field
Note
This application should only be performed using an HP 85913, HP 85933,
HP 85943,
HP
85953, or HP 85963
with
Option 301
(Options
101 and 102
combined).
With Option 301, 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 (j%KY).
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 ,US, 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 ps 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.
b
MKR 85 000 psec
REF 1 492 rn”
aTTE,v I0 d8
302 45 p”
SMPL
i I N
VA SE
SC TS
CORR
CENTER 67.250 MHZ SP/IN 0 HI
CAES BW 1 MHz “BW 300 kHZ XSWP 100 LSBC
Figure 4-13. Triggering on an Odd Field of a Video Format
4. Press TV TRIG EVEN FLD to trigger on an even field of a video format.
Making Measurements
4-l 5