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1740A/1750A/1760 – Series Service Manual
3–1
Block Diagram Description
The 1740A–Series of Waveform/Vector Monitors has the typical composite
displays used to monitor video quality. The 1750A–Series adds SCH phase
measurements. The 1760–Series provides both composite and component
analog capabilities. Option SC added to the 1760–Series provides SCH phase
measurements.
The block diagrams that are discussed here are located in the Diagrams and
Circuit Board Illustrations, at the rear of this volume. There are three block
diagrams. Circuits shown on a diagonal patterned background are not present in
the 1740A–Series instruments; these are the unique circuits for the 1750A–Series
and the 1760–Series.
Signal flow, microprocessor-generated levels, and feedback lines are shown as
solid lines. Control lines are shown as dashed lines. Signal flow is from left to
right on these diagrams.
Block Diagram 1
Input and Waveform Monitor
There are eight identical clamped input amplifiers. Their gain is approximately
unity. They are of the bridging loop-through type and are compensated for 75
characteristic input impedance. All inputs are active and a multiplexer is used to
select signals for display. All three instrument series can accept both composite
and component inputs. Input coupling can be either ac or dc as selected from the
Configure menu. Clamp timing and clamping point are selected in the same
manner. Coupling and clamping selections are for all inputs; they can not be
individually changed.
The Input Multiplexer provides the means to select the input signal for display.
Selection of signals is controlled by the Line Rate Controller in response to front
panel switch selections. The choices are a single input, parade of three inputs
(A1 – A3 or B1 – B3), or an overlaid display of the same three inputs that can be
selected for parade display. Overlay display is at the selected line or field rate.
Parade display is three consecutive lines or fields beginning with the A1 or B1
input signal followed by A2 or B2 and A3 or B3.
Input Amplifier, Clamp,
and Input Selection
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Содержание 1740A Series
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