Circuit
Description
Low Voltage Power
Supply
Fan
3-8
Switches A4
<9
The front-panel switches and menu switches are arranged
in
an
array of 9
rows and 8
columns. The switch scanner sets the nine row lines low in
sequence and performs
an
eight column scan to check for any changes
in
state and reports these changes to the host processor. When a switch
is
closed, one row
is
connected to one column line through
an
isolation diode
and the
column line
is
pulled low indicating a switch closure.
The
low voltage power supply
is
a switching power converter. It supplies
power to
all
oscilloscope circuitry.
The
POWER switch, located on the front panel, controls all power to the
oscilloscope including the power supply.
The fan provides forced air cooling for the oscilloscope.
It
connects
to
+ 12 V
on the A63 Power Supply board.
Theory
of
Operation
•
•
•
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