Keysight Technologies DSO-X 2002A, Руководство пользователя

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138 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide
10
Triggers
• Field1 and Field2 — Trigger on the rising edge of the first serration pulse of
field 1 or field 2 (interlaced standards only).
• All Fields — Trigger on the rising edge of the first pulse in the vertical sync
interval.
• All Lines — Trigger on all horizontal sync pulses.
• Line: Field1 and Line:Field2 — Trigger on the selected line # in field 1 or field 2
(interlaced standards only).
• Line: Alternate — Alternately trigger on the selected line # in field 1 and field 2
(NTSC, PAL, PAL-M, and SECAM only).
9 If you select a line # mode, press the Line # softkey, then rotate the Entry knob
to select the line number on which you want to trigger.
The following table lists the line (or count) numbers per field for each video
standard.
Video Triggering
Examples
The following are exercises to familiarize you with video triggering. These exercises
use the NTSC video standard.
•
“To trigger on a specific line of video" on page 138
• “To trigger on all sync pulses" on page 140
• “To trigger on a specific field of the video signal" on page 140
• “To trigger on all fields of the video signal" on page 141
• “To trigger on odd or even fields" on page 142
To trigger on a specific line of video
Video triggering requires greater than 1/2 division of sync amplitude with any
analog channel as the trigger source. Turning the trigger Level knob in Video
trigger does not change the trigger level because the trigger level is automatically
set to the sync pulse tips.
Video standard Field 1 Field 2 Alt Field
NTSC 1 to 263 1 to 262 1 to 262
PAL 1 to 313 314 to 625 1 to 312
PAL-M 1 to 263 264 to 525 1 to 262
SECAM 1 to 313 314 to 625 1 to 312