Tektronix 1740A/1750A - Manual (Page 57)

Functional Overview
1740A/1750A Series Waveform/Vector Monitor User Manual
3-2
can be activated and positioned for reference or measure-
ment.
LINE SELECT is discussed on page 3-14 and CURSORS
are discussed on page 3-8.
Audio
Audio amplitude and phase is monitored using a calibrated
X/Y Lissajous display. The operator can verify that the
program 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.
SCH
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
reference and measured signals. An external color-field
identification input is also required.
Picture
The PICTURE mode allows the operator to verify the signal
source. In PICTURE mode with LINE SELECT on, a bright-up
marker identifies the selected line in the picture.