Video Triggering
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–129
Figure 3–70: Video Trigger Menu — TV Delay Mode
To select the NTSC, PAL, or SECAM field to trigger on:
Press the TRIGGER MENU
➞ Scan (main) ➞ Odd, Even, or All (side) (see
Figure 3–71).
If you choose Odd, the digitizing oscilloscope always triggers on the start of the
odd field in an interlaced frame.
If you choose Even, the digitizing oscilloscope always triggers on the first line of
the even field in an interlaced frame.
If you choose All, the digitizing oscilloscope alternates between triggering on the
start of the odd and even fields.
If you select Custom in the Class menu, the Scan Rate & Interlace option lists
several frequency range options (see Figure 3–72). Precise setting of the Scan
Period is only required if the video class is Custom and you use video line
cursors; however, adjusting the period also selects the appropriate scan rate.
Also, choosing a scan rate incompatible with the current scan period setting
forces the scan period to the minimum period implied by the selected rate.
By toggling the button next to the Interlaced option, you can trigger on
interlaced field one, interlaced field two, or both fields noninterlaced.
To Select TV Fields
To Set the Scan Rate &
Interlace Mode
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