TM 11-6625-2735-14-1
SWEEP GENERATORS
TIMING AND HORIZONTAL DISPLAY SWITCHING
General
Delaying Sweep Generator
Main Gate Amplifier
Sweep Disconnect Amplifier
Sawtooth Sweep Generator
Sweep Start Amplifier
Output Buffer Amplifier
Delaying Sweep End Difference
Amplifier
Delay Pickoff Comparator
Non-Delaying Sweep Generators
“B” Gate Amplifier
Non-Delaying Sweep Generator
Differences
Mixed Mode Operation
Non-Delaying Sweep End Difference
Amplifier
TIME/DIV Functions (Knobs Unlocked)
HORIZONTAL AMPLIFIER
General
Input Paraphase Amplifier
Gain Setting Amplifier
Output Amplifier
LOW-VOLTAGE POWER SUPPLY
General
Power Input
Secondary Circuit
+50-Volt Supply
+110-Volt Supply
+15-Volt Supply
+5-Volt Supply
–8-Volt Supply
–15-Volt Supply
CRT CIRCUIT
General
High-Voltage Oscillator
High-Voltage Regulator
High-Voltage Rectifiers and Output
Control-Grid DC Restorer
CRT Control Circuits
Z-Axis Amplifier
CALIBRATOR
General
Multivibrator
Output Amplifier
FAN MOTOR CIRCUIT
General
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BLOCK DIAGRAM
General
The following discussion is provided to aid in un-
derstanding the overall concept of the 475 Oscilloscope
before the individual circuits are discussed in detail. A
basic block diagram of the 475 Oscilloscope is shown in
Fig. 3-1. Only the basic interconnections between the
individual blocks are shown on this diagram. Each block
represents a major circuit within the instrument. The
numbered diamond in each block refers to the complete
circuit diagram of that major circuit and this diagram can
be found in the Diagrams Section of this manual.
A complete block diagram is located in the Diagrams
Section of this manual. This block diagram shows the
overall relationship between all of the circuits. Complete
schematics of each circuit are also given in the Diagrams
Section. Refer to these diagrams throughout the following
circuit description for electrical values, waveforms and
relationships of the front panel controls to the individual
stages.
Signals to be displayed on the CRT are applied to the
CH 1 OR X or CH 2 OR Y connectors. The input signals are
then amplified by the Preamplifier circuits. Each
Preamplifier circuit includes separate vertical deflection
factor, input coupling, balance, gain, and variable attenua-
tion controls. The Channel 2 Preamplifier circuit also
contains an INVERT feature to invert the Channel 2 signal
as displayed on the CRT.
The output of each Vertical Preamplifier circuit con-
nects to the Vertical Channel Switching circuit. This
circuit selects the channel(s) to be displayed. An output
signal from this circuit connects to the Z Axis Amplifier
circuit to blank out the switching transients between
channels when in the chopped mode of operation. The
Vertical Channel Switching circuit also provides the
Channel 2 VERT SIG OUT signal (available on the
instrument rear panel) as well as the signals used for
sweep triggering in the NORM, CH 1, and CH 2 positions
of the trigger SOURCE switches and the signal used for X-
axis deflection in the X-Y mode of horizontal operation.
The output of the Vertical Channel Switching circuit
connects to the Vertical Output Amplifier through the
Delay Line. The Delay Line provides a fixed amount of
signal delay through the vertical deflection system to
allow viewing the leading edge of a triggering waveform.
The Vertical Output Amplifier circuit provides the final
amplification for the signal before it is connected to the
vertical deflection plates of the CRT. This circuit includes
the BEAM FINDER switch, which Iimits the vertical and
horizontal deflection to within the viewing area, and sets
the display brightness to a normal viewing level to aid in
locating an off-screen display.
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