HP 54616B User And Service Manual page 72

Delay in TV line units hint
The oscilloscope has the ability to display delay in TV-line units. Using the TV
field trigger mode activates this line-counting feature. When Field 1 or Field 2 is
selected as the trigger source, delay can be set in terms of time or line number.
Both-fields triggering in the oscilloscope hint
The oscilloscope can trigger on the vertical sync pulse in both TV fields at the
same time. This allows you to view noninterlaced video signals which are
common in computer monitors. To trigger on both sync pulses, press Field 1 and
Field 2 at the same time.
TV trigger operating hints
The color burst changes phase between odd (Fields 1 and 3) and even (Fields 2
and 4). It looks double-triggered. Increase the holdoff to greater than the frame
width to fine tune your trigger stability. For example, use a holdoff value of
around 63 ms for NTSC, and around 76 ms for PAL.
When looking at live video (usually a field), use peak detect to improve the
appearance of the display.
When making cursor measurements, use Autostore since you are usually
looking for pulse flatness and extremes.
When using line trigger, use minimum holdoff to display all the lines. Due to the
relationship between the horizontal and vertical sync frequencies the display
looks like it is untriggered, but it is very useful for TV waveform analysis and
adjustment because all of the lines are displayed.
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