Functional Overview

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 displayed 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 requirement 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.

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1740A/1750A Series Waveform/Vector Monitor User Manual