Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 95
Self Test
Troubleshooting Self Test 1105
—If the power level is NOT as expected at all frequencies, replace the
A3 RF assembly.
Depending on the interaction of the ALC circuit, the measured output
power may increase as the frequencies increase.
Frequencies above 2 GHz are controlled by the High Band ALC detector
and will not be visible when making measurements in the Low Band ALC
detector range.