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如何测量电流传输比（CTR）、LED触发电流和输入电流阈值？
请参考东芝应用说明《Glossary of Photocoupler and Photorelay Terms》第2节“Measurement procedure for current transfer ratio, IC/IF(CTR) - Transistor outpu”、第3节“Measurement procedure for threshold input current, IFHL(IFLH) - IC output”，以及第4节“Measurement procedure for trigger LED current, IFT”。
（https://toshiba.semicon-storage.com/cn/semiconductor/knowledge/application-note.html）
例如：电流传输比（CTR）测量电路
（摘自应用说明《Glossary of Photocoupler and Photorelay Terms》第2节“Measurement procedure for current transfer ratio,IC/IF(CTR)- Transistor output”）