Measurement of quartz crystal unit parameters by zero phase technique in a pi-network - Part 3: Basic method for the measurement of two-terminal parameters of quartz crystal units up to 200 MHz by phase technique in a pi-network with compensation of the parallel capacitance Cₒ (IEC 60444-3:1986); German version EN 60444-3:1997
Edition 1997-10

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 60444-4:1988); German version EN 60444-4:1997
Edition 1997-10

Measurement of quartz crystal unit parameters - Part 5: Methods for the determination of equivalent electrical parameters using automatic network analyser techniques and error correction (IEC 60444-5:1995); German version EN 60444-5:1997
Edition 1997-10

Measurement of quartz crystal unit parameters - Part 6: Measurement of drive level dependence (DLD) (IEC 60444-6:2021); German version EN IEC 60444-6:2021
Edition 2023-11

Measurement of quartz crystal unit parameters - Part 7: Measurement of activity and frequency dips of quartz crystal units (IEC 60444-7:2004); German version EN 60444-7:2004
Edition 2004-11

Measurement of quartz crystal unit parameters - Part 8: Test fixture for surface mounted quartz crystal units (IEC 60444-8:2016); German version EN 60444-8:2017
Edition 2017-11

Measurement of quartz crystal unit parameters - Part 9: Measurement of spurious resonances of piezoelectric crystal units (IEC 60444-9:2007); German version EN 60444-9:2007
Edition 2007-12

Measurement of quartz crystal unit parameters - Part 11: Standard method for the determination of the load resonance frequency fL and the effective load capacitance CLeff using automatic network analyzer techniques and error correction (IEC 60444-11:2010); German version EN 60444-11:2010
Edition 2011-06

Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors (IEC 60445:2021); German version EN IEC 60445:2021
Edition 2023-02

Basic and safety principles for man-machine interface, marking and identification - Actuating principles (IEC 60447:2004); German version EN 60447:2004
Edition 2004-12