Measure Fan Speed Rotation by HIOKI (source code)

= Measure Fan Speed Rotation by HIOKI
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https://www.hioki.com/global/learning/applications/detail/id_113354

Manufacturer application description: a non-contact tachometer illuminates reflective tape on a rotating fan and counts the reflected-light pulses. The indexed primary page verifies that apparatus and pulse-counting principle. Direct page retrieval returned HTTP 403; no unavailable manual details or current performance specification are inferred.