Keysight N5221A/22A Service Guide 4-41
Troubleshooting
Measurement System Troubleshooting
— A25, A26, A27, or A28 receiver coupler
— A34, A35, A36, or A37 source step attenuator
— A38, A39, A40, or A41 bias tee
— A29, A30, A31, or A32 test port coupler
Equipment Used for These Tests
To determine which assembly is defective, check the signal at each available
measurement point in the signal path from the output of the source board to
the output port.
Set the network analyzer for an S
11, S22, S33, or S44,
measurement for Port 1, 2,
3, or 4 respectively, with a CW frequency of 800 MHz.
Perform the following checks in the order presented.
Checking the A25, A26, A27, and A28 Receiver Couplers
1. Locate the appropriate semirigid cable at the output of the receiver
coupler to be checked:
— Options 200 and 400
— Port 1; W11 of A25
— Port 2; W23 of A28
— Port 3; W15 of A26
— Port 4; W19 or A27
— Options 219 and 419
— Port 1; W71 of A25
— Port 2; W83 of A28
— Port 3; W75 of A26
— Port 4; W79 of A27
2. Using a 5/16-inch torque wrench, disconnect the semirigid cable at the
receiver coupler.
3. Connect the spectrum analyzer to the open receiver coupler connector.
Set the spectrum analyzer to measure a signal at 800 MHz.
Equipment Type Model or
Part Number
Alternate Model or Part
Number
Spectrum analyzer 8565E
856xE
a
a. Must be capable of measuring a signal at 1 GHz.
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