Theory of Operation
TDS 340A, TDS 360 & TDS 380 Technical Reference
3–5
The A20 Low Voltage Power Supply is a switching power converter. It supplies
power to all the circuitry in the oscilloscope.
The Low Voltage Power Supply does not have a main power switch. The
ON/STBY switch, located on the front panel, controls all the power to the
oscilloscope except the standby circuits in the Low Voltage Power Supply.
The fan provides forced air cooling for the oscilloscope. It connects to a 12 V
connector on the Low Voltage Power Supply.
Low Voltage Power Supply
Fan
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