All OTDR and iOLM products
What can I do if I frequently receive a message similar to the one below when using my OTDR or iOLM instrument?
"Injection level is low or reflectance is high at the unit's port."
This most often occurs when the optical port connector is dirty or damaged. A troubleshooting guide can be found here.
If after following the steps in the troubleshooting guide, you are unsuccessful, then your instrument should be sent for a Connector Replacement and Calibration service.
You will find here, the process for sending an instrument for calibration.