Microwave Preselector Bypass (Option Mpb) - Keysight Technologies X Series Service Manual

RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting

Microwave Preselector Bypass (Option MPB)

Allows the YTF to be bypassed, improving amplitude accuracy.
Assure start frequency is 3.6 GHz or greater. Press Amplitude, uW Path
Control, uW Preselector Bypass.
When the bypass switches Switch 1 and Switch 2 change state you will hear a
click. Depending on the signal source connected, you may see many "signals"
appear on screen because without pre-filtering, the analyzer will display image
and multiple responses. The real input signal should not change amplitude
when you switch the uW Preselector Bypass on and off.
202 Keysight N9010A EXA Service Guide