IS 7957-1976

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.