Assuming the AC signals in the measurement are very small, the power ratings of the ports limit the absolute maximum DC voltage that can be measured to approximately 5V. Most POL applications are 3.3V or lower, so that this is not a problem for the output side of the POL. However, many POLs operate at input voltages above 5V, which would damage the front end of the analyzer if we directly connected the input voltage to the analyzer. In this case, the PDN measurement can still be performed, though some adjustment to the setup is needed.
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