Measurement techniques of piezoelectric, dielectric and electrostatic oscillators - Part 1: Basic methods for the measurement (IEC 62884-1:2017); German version EN 62884-1:2017— 66 стр.
Measurement techniques of piezoelectric, dielectric and electrostatic oscillators - Part 3: Frequency aging test methods (IEC 62884-3:2018); German version EN IEC 62884-3:2018— 15 стр.