1735 HD High Definition Waveform Monitor
4–1
Theory Of Operation
The Theory of Operation section is divided into three parts. First is the Instru-
ment Overview, followed by the Block Diagram Overview that describes the
architecture of the 1735 HD in function blocks. Last are the Circuit Descriptions
of the schematic diagrams.
Instrument Overview
The 1735 HD is a multi-standard, six input waveform monitor. It is designed for
component or composite format HDTV, medical, computer graphics, or machine
video applications with analog bandwidths of up to 30 MHz. Special line rate
applications include standards development in HDTV systems, video monitoring
in medical x-ray and CAT scanning systems, monitoring of computer graphics
video, and monitoring of high-bandwidth video used in precision machine
positioning.
Full line-select capability, with on-screen identification of selected rate and
field/line, is provided for every field/line rate.
The 1735 HD can be operated from AC mains over the range of 90–250 V,
48–66 Hz without operator adjustment.
Block Diagram Overview
The discussions in this section rely on the main Block Diagram and the
individual schematic diagrams, located on foldout pages in the Diagrams section
of the manual. A simplified block diagram of the 1735 HD is also shown in
Figure 4–1.
On the main Block Diagram, the microcontroller signal names are identified
using upper case ITALIC type. Circuit blocks are accompanied by a number in
the following format: <1>, <2>. This number indicates which foldout schematic
diagram details that circuit block.
The 1735 HD has six identical video input amplifiers, arranged in two banks of
three. Each amplifier has its own back-porch clamp, with clamp timing specific
for each of the video line rates supported by this instrument. These amplifiers
may be in fast clamp mode, slow clamp mode, DC coupled mode, or input
grounded. All six of the video input amplifiers must operate in the same mode,
with the same clamp timing.
Vertical
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