Keysight N9010B - Page 225

Keysight N9010B EXA Signal Analyzer Service Guide 225
RF Section Troubleshooting (Millimeter-Wave Analyzers)
Troubleshooting
To verify calibrator switch operation, connect external signal source set to
4.8 GHz and −25 dBm to the RF input connector of analyzer under test. Press
Input/Output, RF Calibrator, Off. If the signal level at the attenuator output is
now correct, suspect the A9 Attenuator cal switch or a faulty control signal
from the A15 Front End Controller assembly.
Attenuation Check
Set the signal source connected to the analyzer input port to 0 dBm. On the
analyzer, press Amplitude, Attenuation, Mech Atten and change input
attenuation to 0 dB. The measuring spectrum analyzer connected to A10
Attenuator output port should indicate a 0 dBm level. Change the input
attenuation on the analyzer under test to 2 dB (if Option FSA is present), or to
10 dB (if Option FSA is not present).
See the chart below for expected measurement values at the A10 Attenuator
output port.
Analyzer Under Test
Attenuator Setting (dB)
Power at A10 Output
Port (dBm)
Input Attenuator Being
Tested
0 0 dBm (reference) Both set to through path
2
a
a. These settings only available if Option FSA is installed.
−2A9
4
a
−4A9
6
a
−6 A9
8
a
−8A9
10 −10 A10
20 −20 A10
30 −30 A10
40 −40 A10
50 −50 A10
60 −60 A10