Service Guide E8364-90038 5-33
PNA Series Microwave Network Analyzers Theory of Operation
E8362C, E8363C, E8364C Power Supply Group Operation
Power Supply Group Operation
The A4 power supply assembly is a switching power supply operating at 103 kHz switching frequency. The
input power ranges for the power supply are 90 to 132 Vac or 195 to 250 Vac. The power supply
automatically senses the input voltage and switches between these two ranges.
The dc output voltages are:
•+5.2 V
• ï€5.2 V
•+9 V
•+15 V
• +15 V standby (always on)
• ï€15 V
•+22 V
• VCC (5.2 V for the A15 CPU board)
• VDL (3.3 V to the A15 CPU board)
The +15 V standby line remains on continuously whenever the power supply is plugged in. This line is used
to provide power to front panel LEDs and CPU components when the analyzer is turned off.
An additional +32 V supply line is generated on the A14 system motherboard from the +22 V supply line.
NOTE If the power supply senses an over-voltage or over-current condition on any of the supply
lines, the power supply will cycle on and off at a low voltage level (burp mode).
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