5a-16
Theory of Operation
A12 Reverse Power Protection(8648B/C/D)
A12 Reverse Power Protection(8648B/C/D)
The reverse power protection assembly is designed to protect the instrument from power
applied to the RF output from an external source. It opens the RF path when an excessive
power level is detected. When it is tripped the front panel indicates that RF power is off. To
reset the RPP assembly, just turn the RF power on again.
Calibration EEROM on the motherboard contains calibration data specific to this
assembly. It needs to be updated whenever the RPP assembly is replaced.
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