STANFORD RESEARCH SR540 OPTICAL CHOPPER CONTROLLER w/ SR541

The SR540 is an optical chopper controller made by Stanford Research Systems (SRS). It is designed to modulate continuous light sources by periodically interrupting the light beam at precise frequencies — a key technique in optical experiments and signal recovery systems, especially in conjunction with lock-in amplifiers and spectroscopy setups.

New and in the orjinal box.Not used.

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