Theory of Operation
Power Converter
The Power Conve
rter receives +12 V power and +5 V standby power from the
main power s upply and generates voltages for the analog and digital c ircuitry on
the Main board. The front panel receives the +5 V standby power, and uses input
from the power switch to turn the oscilloscope on and off.
Front-Panel Board
The Front Panel board contains a microprocessor that reads the front-panel buttons
and controls, and then s ends this information to the processor system on the Main
board. The Front Panel board also generates the probe compensation output signal
and provid
es an interface to the application modules.
4 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual
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