Tektronix VM700T - Manual (Page 12)

Measurement methods
The following paragraphs specify
the methods for each Option 11
measurement. Where appropriate,
reference is made to the relevant
CCIR recommendation.
Line blanking timing measurements
Color Burst Duration: Measured
between the half-amplitude
points of the burst chrominance
envelope. Result expressed as
the number of cycles between
the half-amplitude points. See
duration “h’’ in waveform
diagram. CCIR Report 624-1.
Front Porch Duration: Measured
from the half-amplitude point
between peak white-level and
blanking to the half-amplitude
point of the leading edge of sync.
See duration “c’’ in waveform
diagram. CCIR Report 624-1.
Line Blanking Interval: Mea-
sured from the half-amplitude
point between peak white-level
and blanking at the front
porch to the half-amplitude
point between blanking-level
and peak white level at the
back porch. See duration “a’’
in waveform diagram. CCIR
Report 624-1.
Line Sync Rise and Fall Time
(Build-up Times): Measured
between the 10% point and
the 90% point of the line-syn-
chronizing pulse leading edge
(Rise Time) and trailing edge
(Fall Time).
Line Sync Width: Measured
between the half-amplitude
points on the leading edge and
trailing edge of sync. See dura-
tion “d’’ in waveform diagram.
CCIR Report 624-1.
Sync-to-Start of Burst: Mea-
sured from the half-amplitude
point of the leading edge of
sync to the half-amplitude
point of the leading edge of the
burst chrominance envelope.
See duration “g’’ in waveform
diagram. CCIR Report624-1.
Field blanking timing measurements
Equalizing Pulse Duration:
Measured between the
half-amplitude points of the
leading edge and trailing edge
of the equalizing pulse. See
duration “p’’ in waveform dia-
gram. CCIR Report 624-1,
Figure 2-1 (a), (b), and (c).
Broad Pulse Duration:
Measured between the
half-amplitude points of the
leading edge and trailing
edge of the broad pulse. See
duration “q’’ in waveform
diagram. CCIR Report 624-1,
Figure 2-1 (a), (b), and (c).
Line Blanking Timing Waveform Measurements.
Field Blanking Timing Waveform Measurements.
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