HP 54710A User's Reference Manual page 297

Trigger Menu
Mode
Standard TV
The standard TV menu enables the oscilloscope to trigger on clamped TV
signals that use the 525 lines/60 Hz, 625 lines/50 Hz, 875 lines/60 Hz
standards.
Standard Softkey The standard softkey allows you to select between
the three most common TV standards: 525 lines/60 Hz (NTSC) is the
standard used in the United States, 625 lines/50 Hz (PAL ) is the
standard used in most European and countries, and 875 lines/60 Hz is the
high-definition TV standard used by Zenith in the United States.
Field The field softkey allows you to set the oscilloscope to trigger on
either field 1 and field 2 of the interlaced TV signal.
Line The line softkey allows you to select which of the lines within the
chosen field you want the oscilloscope to trigger on. The trigger is
generated on the selected line. The range of lines you can choose from
depends on what the standard and field softkeys are set to.
When the standard softkey is set to 525 lines/60 Hz (which is compatible
with broadcast standard M), field 1 allows a range of lines from 1 to 263 and
field 2 allows a range of lines from 1 to 262. When the standard softkey is
set to 625 lines/50 Hz (which is compatible with broadcast standards B, C, D,
G, H, I, K, K1, L, and N), field 1 allows a range of lines from 1 to 313 and field
2 allows a range of lines from 314 to 625. When the standard softkey is set
to 875 lines/60 Hz, field 1 allows a range of lines is from 1 to 438 and field 2
allows a range of lines from 1 to 437.
Sync Polarity The Sync polarity softkey allows you to trigger on
either a positive or negative sync pulse in the TV signal.
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