Keysight Technologies N5224A Service Manual page 113

Troubleshooting
Measurement System Troubleshooting
Checking Port 1, 2, 3, or 4 Power Outputs (A, B, C, or D Signals)
The object of this check is to verify the power of the output signal across the
entire frequency range. Perform this test if there is an observed problem only
with one receiver trace. The ten second sweep is slow enough to allow you to
observe the output power on the power meter as the sweep occurs.
1. Connect the power sensor to the suspect port.
2. Set the trace to measure S
port.
3. Observe the power reading on the power meter as the sweep occurs on
the analyzer.
4. The measured output power on the power meter should be at least the
preset power level ±1 dB over the entire frequency range.
— If the measured power is correct, go to
— If the measured power is not correct, go to
Checking the Signal through the Signal Separation Path
For all of the following checks, refer to the block diagrams at the end of this
chapter and to any of the following that are appropriate:
— "2-Port Configuration, Option 200" on page 6-22
— "Bottom RF Cables, Standard 2-Port Configuration, Option 200" on
page 6-24
— "2-Port Configuration, Option 219" on page 6-47
— "Bottom RF Cables, 2-Port, Option 219" on page 6-49
— "4-Port Configuration, Option 400" on page 6-54
— "Bottom RF Cables, Standard 4-Port Configuration, Option 400" on
page 6-56
— "4-Port Configuration, Option 419" on page 6-84
— "Bottom RF Cables, 4-Port, Option 419 (Ports 1 and 2)" on page 6-86
— "Bottom RF Cables, 4-Port, Option 419 (Ports 3 and 4)" on page 6-89
Trace loss in the signal separation group is due to one or more of the following
assemblies being defective:
— A29, A30, A31, or A32 receiver coupler
— A38, A39, A40, or A41 source step attenuator
— A42, A43, A44, or A45 bias tee
— A33, A34, A35, and A36 test port coupler
Keysight N5224A/25A Service Guide
11
Group" on page 4-43.
through the Signal Separation Path" on page
, S , S , or S , dependent on the suspect
22 33 44
"Checking the Receiver
"Checking the Signal
4-41.
4-41