Agilent Technologies N5242A Service Manual page 109

PNA Series Microwave Network Analyzers
N5242A
• 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
Equipment Type
Spectrum analyzer
a. Must be capable of measuring a signal at 1 GHz.
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
respectively, with a CW frequency of 1 GHz.
Perform the following checks in the order presented.
Checking the A25, A26, A27, and A28 Bridges
1. Locate the appropriate semirigid cable at the output of the bridge 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, 224, 419, and 423
— 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 bridge.
3. Connect the spectrum analyzer to the open bridge connector. Set the spectrum analyzer
to measure a signal at 1 GHz.
4. If the 1 GHz signal is not present and the analyzer has source bypass switches, continue
testing at "Checking the A46, A47, A48, and A49 Source Bypass Switches" on page
5. If the 1 GHz signal is not present and the analyzer does not have source bypass
switches, replace the bridge. Refer to
and Bridge Mounting Brackets" on page
6. If the 1 GHz signal is present and the analyzer has source attenuators and bias tees,
Service Guide N5242-90001
Model or Alternate Model or
Part Number Part Number
8565E
856xE
S S or S measurement for Port 1, 2, 3, or 4
11, 22, 33, 44,
"Removing and Replacing the A25–A28 Bridges
7-36.
Measurement System Troubleshooting
a
Troubleshooting
4-36.
4-35