Theory of Operation
4–24
1735 HD High Definition Waveform Monitor
Controls.
A set of variable controls consisting of the horizontal position, vertical
position, vertical calibration, scale and focus controls select a DC voltage level
b11.8 V and –11.8 V.
The INTENSITY control operates in conjunction with the Z-Axis control circuit
on Diagram 12. DC levels for Intens 1, Intens 2, and Intens 3 depend on the
operating mode selected, which dictates the level on each of the leads.
The low voltage power supply converts the mains line voltage (between 90 and
250 volts) to supply the power requirements of the instrument. The low voltages
supplied from the central power supply are +40 V, +15 V, +5 V, and –15 V.
Line Rectifier and Filter.
The input line voltage is filtered in the rear-panel
connector to prevent AC line noise from affecting instrument performance, and
to prevent any noise generated within the waveform monitor from getting back
to the AC line. R125 and R131 provide surge protection, limiting initial turn-on
current through the rectifier and capacitors.
Low Voltage Power Supply
Diagram <14>
Summary of Contents for 070-8462-03
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