PIM Site Analyzer
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Manual
© Rosenberger 2017 -
www.rosenberger.com/pia
Page 37 of 54
8.4 Fundamental rules for handling fiber optics
Laser Safety must be a concern. Refer to the module's documentation. Infrared Laser light is invisible and
may be harmful for your eyes. Check fiber surfaces only with a video microscope.
•
Make sure, SFP (pluggable module) is compatible with fiber type
•
Do not mix fiber types in a link
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Do not touch connector ferrule
•
Use protection caps whenever a connector or a module is not mated
•
Do not bend or kink optical cables (R ≥ 25 mm)
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Only use suitable cleaning equipment (Reel Cleaner, Click Cleaner)
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Check fiber surface with a video microscope before mating a connector
9 Measurement Examples
The following instructions are only recommendations. The actual requirements of
PIM testing and verification can vary depending on the site operators specifications.
9.1 RF Measurements
Common Checklist for fixing PIM:
1. Tighten RF-Connectors using appropriate torque
2. Cleaning connector interfaces with alcohol, Q-Tip and compressed air
3. Replace components (e.g. feeder connector)
9.1.1 PIM acceptance test
1. Disconnect cable from base station and connect it to the test port of the device
2. Disconnect the antenna and terminate the connection with a Low PIM Load (60Z150-020)
3. Do a 2 Tone measurement, during which you tap on every cable junction to simulate mechanical
stress (e.g. wind)
4. Do a Sweep measurement over the widest possible frequency range
5. If PIM is not within specified limit refer to 9.1.2
6. IF PIM is within specified limit, create test report and save it
9.1.2 Troubleshooting a PIM problem
1. Disconnect cable from base station and connect it to the test port of the device
2. Disconnect the antenna and terminate the connection with a Low PIM Load (60Z150-020)
3. Use the Spectrum Analyzer to evaluate interference signals from external sources (e.g. mobile
phones or other operator creating strong PIM signals) and eliminate them if present
4. Do a Sweep measurement to evaluate if the PIM depends on frequency
1. If no PIM is present do a 2 Tone measurement with a tap test
