Tektronix 1760 - Manual (Page 70)

Functional Overview
1760 Series Component Waveform/Vector Monitor User Manual
3-2
SCH
(Option SC Only)
SCH provides a vector display of the subcarrier-to-horizontal-
sync phase relationship. The burst vector and the phase of
the 50% point of the leading edge of sync are displayed.
Subcarrier-to-horizontal phase and color framing are dis-
played graphically in the polar
SCH display. Sync jitter over
the field is displayed as a moving sync vector dot. Correct
color framing can be verified by the position of the single
sync vector dot, relative to the color subcarrier vector when
the monitor is externally referenced.
The SCH phase of the reference signal is separately sensed to
allow reliable color framing comparison. Using this method
of determining relative color framing eliminates the require-
ment for a precise horizontal timing match between the refer-
ence and measured signals.
Waveform
The waveform monitor portion of the instrument provides a
voltage-versus-time display of the video signal. The selected
input can be displayed in one or two line, or one or two field
sweeps. In
LINE SELECT mode, identified lines of any field
can be selected and displayed. Multiple inputs can be dis-
played at the same time, or multiple filters can be applied to
one input for signal analysis.
TIME and VOLTAGE cursors can
be activated and positioned for reference or measurement.
LINE SELECT is discussed on page 3-16 and CURSORS are
discussed on page 3-10.
Audio
Audio amplitude and phase is monitored using a calibrated
X/Y Lissajous display. The operator can verify that the pro-
gram audio will be properly reproduced on both monaural
and stereo receivers. Correct phasing between two audio
channels is quickly verified by the direction of the display.