Jisho

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周波数
Wikipedia definition
1. Frequency counterA frequency counter is an electronic instrument, or component of one, that is used for measuring frequency. Frequency is defined as the number of events of a particular sort occurring in a set period of time. Frequency counters usually measure the number of oscillations or pulses per second in a repetitive electronic signal. Such an instrument is sometimes referred to as a cymometer, particularly one of Chinese manufacture.
Read “Frequency counter” on English Wikipedia
Read “周波数カウンタ” on Japanese Wikipedia
Read “Frequency counter” on DBpedia

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