Power Supply Group Operation - Agilent Technologies N5242A Service Manual

Theory of Operation

Power Supply Group Operation

Power Supply Group Operation
The A16 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.
WARNING Supply voltages which oscillate between the two normal input
ranges of the autoranging line voltage input will damage the power
supply. In rare cases, this damage has become a user safety concern.
If unstable power levels are expected, the analyzer input power must
be buffered by a line conditioner.
The dc output voltages of the A16 power supply assembly are:
• +15 V analog
• +9 V analog
• +3.3 V analog
• +5.2 V analog
• +15 V standby (always on)
• +32 V analog
• −15 V analog
• −5.2 V analog
• −7 V analog
• +5.1 V standby
• +12 V digital
• +3.35 V digital
• +5.1 V digital
The +15 V standby supply remains on continuously whenever the power supply is plugged
in. This supply is used to provide power to front panel LEDs and CPU components when
the analyzer is turned off.
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PNA Series Microwave Network Analyzers
Service Guide N5242-90001
N5241A/42A