Beckhoff EtherCAT EK112 Series Manual page 42

Commissioning/application notes
Evaluation of a fiber-optic transmission link by means of measurement
A fiber-optic transmission link can be described and evaluated with parameters from data sheets. In order to
obtain a real result for the attenuation over the entire link, however, the link must be measured using an
optical power meter (OPM). The power at the end of the transmission link can be measured with an OPM.
When measuring with an OPM, it is essential to ensure that only the required adapter (FC, SC, ...) is
screwed to the OPM. If several adapters are screwed above one another to the OPM, the distance between
the connector and the detector in the OPM is too large, with the result that lower power values are displayed
(greater attenuation than actually exists).
OPM without adapter
OPM with SC adapter screwed on
42
OPM with FC adapter screwed on
OPM with FC and SC adapter screwed on -
WRONG
Version: 3.6 EK112x, EK15xx