BK Precision 2560B Series, Руководство пользователя

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Trigger
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9.2.4 Video Trigger
Video triggering can be used to capture the complicated waveforms of most standard analog video signals. The trigger
circuitry detects the vertical and horizontal interval of the waveform and produces triggers based on the video trigger
settings you have selected.
The oscilloscope supports standard video signal field or line of NTSC (National Television Standards Committee), PAL
(Phase Alternating Line) HDTV (High Definition Television) and custom video signal trigger. To select
Pulse Trigger
type:
1. Press the Setup key or use the touchscreen controls to enter the Trigger Menu .
2. Use the touchscreen to select Type .
3. The window shown in figure 9.3 will appear.
– Use the touchscreen to Video .
4. Use the touchscreen to select Standard , select the desired video standard. ( 9.2 .)
Standard Type Sync Pulse
NTSC Interlaced BI-level
PAL Interlaced BI-level
HDTV 720P/50 Progressive Tri-level
HDTV 720P/60 Progressive Tri-level
HDTV 1080P/50 Progressive Tri-level
HDTV 1080P/60 Progressive Tri-level
HDTV 1080iP/50 Progressive Tri-level
HDTV 1080i/50 Progressive Tri-level
Custom
Table 9.2 Video Standards
The parameters of Custom Video Trigger are shown in table 9.3 .
Frame Rate 25 Hz, 30 Hz, 50 Hz, 60 Hz
Of Lines 300 to 2000
PAL 1, 2, 4, 8
HDTV 720P/50 1:1, 2:1, 4:1, 8:1
Trigger Position Line Field
(line value)/1 1
(line value)/2 1,2,3,4,5,6,7,8
(line value)/3 1,2,3,4,5,6,7,8
(line value)/4 1,2,3,4,5,6,7,8
(line value)/5 1,2,3,4,5,6,7,8
(line value)/6 1,2,3,4,5,6,7,8
(line value)/7 1,2,3,4,5,6,7,8
(line value)/8 1,2,3,4,5,6,7,8
Table 9.3 Custom Video Trigger Parameters
Line value: The number of lines set in the Of Lines (300 2000).
Table 9.4 explains the relation between Of Lines , Of Fields , Interlace , Trigger Line and Trigger Field using an
Of Lines value of 800.