Front Panel and
System Control
High
and
Low
Voltage
Power
Supply
Z-axis
2212 Service Manual
2212 Block Diagram
The front panel circuit together with the system control circuit controls the
operation of the oscilloscope. A micro processor
in
the front panel circuit
reads the closure of bush button and rotational switches and the wiper
position of potentiometers. The front panel processor communicates the
changes
in
front panel settings to the system processor
and
activates the
front panel
LED's
as indicated by the system processor. The system proces-
sor processes the information received from the front panel processor and
generates the correct command data strings to control the circuit throughout
the 2212.
The high and
low
voltage power supply generates the necessary positive
and negative voltages, and the high voltage
in
one switched anode power
supply stage.
The
galvanic isolation from the main
input
accomplished
with a toroid mains transformer, a rectifier bridge
and
a switch mode pre-
regulator circuit. The post acceleration voltage
is
achieved
in
a multiplica-
tion stage.
The Z-axis circuit controls the brightness
and
focus of the
CRT.
During the
retrace the display is blanked. The sweep gate signal received from
the
sweep generator circuit acts as unblanking signal.
The
amplitude of the
unblanking signal is controlled by the intensity control
on
the front panel
and grid bias adjustment.
3-5
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