IS 7957-1976

百检网 2021-07-17
标准号:IS 7957-1976
发布日期:1976/7/1 12:00:00
实施日期:1999/12/31 12:00:00
适用范围: This standard specifies a simple method of measurement of resonance frequency and equivalent series resistance of quartz crystal units in the frequency range of 1 MHz to 125 MHz with a fractional frequency accuracy ranging between 10-6 and 10-8 depending on the type of crystal and an accuracy on the equivalent series resistance of ±2 percent to ±5 percent depending on the accuracy of the voltage measurement by a zero phase technique in a 7r-network.Note — The electrical characteristics of the π-nctwork are fully specified.

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