A photoelectric coupler is a device that converts optical signals into electrical signals. It is widely used in industrial control, instrumentation, communication equipment, automation equipment and other fields. This manual mainly introduces the basic structure, working principle, characteristic parameters, application circuits, typical products and selection suggestions of photoelectric couplers.
This manual introduces CETC's optical couplers, which integrate a light emitter and detector in a single package to provide electrical isolation and signal transmission. It describes the unique characteristics, such as ground‑loop suppression, signal amplification, high‑speed operation, and compact packaging.
The document lists common parameters, typical waveforms, and replacement part equivalents for many GH‑series models, and provides guidance on selecting and using the couplers in various circuits and applications. This manual is written in Chinese.
It combines a light emitter and a light detector in one package to transmit signals optically while providing electrical isolation.
They suppress ground‑loop noise, eliminate interference, provide high‑speed signal transmission, and have compact dual‑row packages with single, dual, or multi‑channel options.