EN 60122-1:2002/A1:2018
BS EN 60122-1:2002+A1:2018. Identical. EN 60444-4:1997. Measurement of quartz crystal unit parameters by zero phase technique in a pi-network - Part 4: Method for the measurement of the load resonance frequency fL, load resonance resistance RL and the calculation of other derived values of quartz crystal units, up to 30 MHz. IEC 60068 …