Operational "How to" Guides
Summary
What does it mean when there is a big discrepancy between the readings of the OTDR link loss and my light source/power meter readings?Description
A power meter source measurement correctly done is the more accurate of the loss readings. You should always measure the loss from both sides with an OTDR and take the average of the 2 measurements. Lastly, the source/power meter measurement takes into account the two end connectors, which the OTDR trace may not. Also, it is important to ensure the wavelengths of both measurements match.