Theory of Operation
1735 HD High Definition Waveform Monitor
4–27
Over-Voltage Protection.
Over-voltage protection is provided to protect the
instrument from damage if the supply fails to regulate. If the +5 V supply rises to
approximately 5.8 V, VR1 conducts, causing Q11 to conduct and ground the
+5 V supply. This forces the supply into current limit and shuts the controller
down.
Voltage Reference and Error Amplifier.
The internal reference for U3A is 0.2 V.
R79 (Rf) and R77 (Ri) set the reference output to 2.5 V. U3B is a comparator.
R70 is the 5 V ADJ, which allows variations in the 5 V supply to modulate the
secondary of T3 and generate the waveform sampled by the peak detector circuit.
C41 and R76 dampen high frequency oscillations.
The High Voltage Power Supply generates the heater, cathode, control grid, focus
anode, and post accelerating potentials required to display the outputs of the
Vertical and Horizontal Output Amplifiers.
High Voltage Power
Supply
Diagram <15>
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