Theory of Operation
4–6
1735 HD High Definition Waveform Monitor
Sync Switch (for internal sync).
The 1735 HD can use sync from the video on
CH 1A or CH 1B, or from EXT SYNC on the rear panel. Sync from CH 1A is
enabled by a current-mode switch. Common-base amplifier Q35 converts the
video from CH 1A to a current signal. A TTL low signal at the base of Q36
shunts this current to ground. A TTL high signal switches the video signal
current to Q37. Q38, Q39, and Q40 form an identical switch for CH 1B.
Video Switch and Pix Mon.
Multiplexer U50 selects a signal from one of its eight
video inputs, controlled by the three select signals VMUX0, VMUX1, and
VMUX2. The video switch has unity gain. The driver gain is 1.78, and the video
gain from the rear panel to the driver output (U38, pin 6) is approximately 2.
U21 provides a 75
W
back-terminated PIX MON output for the rear-panel BNC.
The PIX MON output signal consists of the video switch output signal with a
brightup strobe added. When /STROBE is low, U19B adds approximately
400 mV to the 2X video at U21, pin 6.
Video Multiplexer /
Vertical Gain
Diagram <4>
Summary of Contents for 070-8462-03
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