DIN IEC 60444-4:1992-11
Отменен
Measurement of quartz crystal unit parameters by zero phase technique in a <pi>-network; part 4: method for the measurement of load resonance frequency f<(Index)L>, load resonance resistance R<(Index)L> and the calculation of other derived values of quartz crystal units, up to 30 MHz; identical with IEC 60444-4:1988
