Theory of Operation
4–2
1735 HD High Definition Waveform Monitor
Figure 4–1: Simplified basic block diagram of the 1735 HD High Definition Waveform Monitor
A one-of-eight video switch (multiplexer) selects a video input, or a sequence of
video inputs, to provide overlaid or parade displays, or a vertical calibration
display. The output of this video switch is available at the rear-panel PIX MON
OUT, with a brightup strobe added for the line select displays. If subtract mode
is enabled, the video from CH 1B can be subtracted from the output of the
one-of-eight video switch at the input to the filter switch. The filter select switch
selects full bandwidth or reduced bandwidth to remove high frequency noise.
The gain cell sets the vertical gain, and if the vertical VAR gain is enabled, it
provides front panel control of vertical gain.
The front-panel vertical position control is a backlash potentiometer, which has
two ranges of adjustment. When the limits of the fine adjustment are reached, a
coarse adjustment is activated to change the positioning window of the fine
adjustment.
When overlaid or parade displays are selected, positioning of all vertical signal
elements is required. The vertical level shift combines these vertical positioning
signals with the video from the filter switch.
When the vertical X5 magnifier is enabled, the vertical limiter provides a five
times gain increase. The vertical limiter clips the portions of the positioned
vertical signal that would be far off-screen, reducing the dynamic range and
power dissipation required in the vertical deflection amplifier.
The vertical deflection amplifier is a differential cascode amplifier that drives the
capacitive load of the CRT vertical deflection plates. The differential amplitude
Summary of Contents for 070-8462-03
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