Checking The Source Group - Agilent Technologies N5230C Service Manual

PNA Series Microwave Network Analyzers
N5230C

Checking the Source Group

Source Group Tests
NOTE A defective test port switch can exhibit the same symptom as a faulty source. Therefore, if it
is determined that the source is functioning properly, you are directed to
Signal Separation Group" on page
Equipment Used for These Tests
Equipment Type
Spectrum analyzer
Power meter
Power sensor, 3.5 mm
RF cable, 3.5 mm (f) to 3.5 mm (f)
Power sensor, 2.4 mm
RF cable, 2.4 mm (f) to 2.4 mm (f)
Getting Ready to Test
Before checking the assemblies, you must open the analyzer.
CAUTION Use an antistatic work surface and wrist strap to reduce the chance of electrostatic
discharge for all of the procedures in this chapter.
1. Turn off the analyzer power.
2. Unplug the power to the analyzer and disconnect all rear panel connections.
3. Remove the covers from the analyzer. Refer to
WARNING Procedures described in this document are performed with power supplied to the product
while protective covers are removed. Energy available at many points may, if contacted,
result in personal injury.
4. With the covers off, plug in the analyzer and turn on the power.
Single vs. Broadband Failure
There are two main types of failures that are related to the source group. The failures are classified as:
• broadband
• single band
Single band failures are indicated by all four channel traces having partial dropouts across the frequency
range or intermittent phase lock problems. Troubleshooting information is provided under "If the traces
faults are band-related," under
Broadband failures are indicated by all four channel traces being in the noise floor. Most often this is due to
problems in the phase lock signal path and will be characterized by a "PHASE LOCK LOST" error message on
Service Guide N5230-90024
4-36.
Models
Used With
All
All
20 GHz models
20 GHz models
40 and 50 GHz models
40 and 50 GHz models
"Removing the Covers" on page
"All Traces" on page 4-27.
Measurement System Troubleshooting
"Checking the
Model or Alternate Model or
Part Number Part Number
8565E None
E4418B/19B E4418A/19A
8485A None
85131C Any
8487A None
85133C Any
7-6.
Troubleshooting
4-29