HP 54520 Series - Page 103

Trigger
TV Trigger Mode
Level/Polarity Softkey
The level softkey sets the trigger level (in volts) that is applicable only to
the TV trigger source.
Field Softkey
The field softkey selects field 1 or 2 of the TV video signal.
Line Softkey
The line softkey selects which line the trigger is generated on. This
selection depends upon which field was selected.
If the previous selection is the 60 Hz, 525 line standard (which is compatible
with broadcast standard M), the options available depend upon which field is
selected. If field 1 is selected, the range of lines is from 1 to 263. If field 2 is
selected, the range of lines is from 1 to 262.
If the 50 Hz, 625 line standard is selected (which is compatible with
broadcast standards B, C, D, G, H, I, K, K1, L, and N), the options are also
dependent upon the field selection. If field 1 is selected, the range of lines is
from 1 to 313. If field 2 is selected, the range of lines is from 314 to 625.
Holdoff Softkey
The holdoff softkey enables the oscilloscope to hold off the trigger event
from 40 ns to 320 ms, and is incremented in 20-ns time frames.
5-20