"This standard details methods for testing components@ equipments and other electrotechnical products (hereinafter referred to as ""specimens"") which in service can be subjected to pulsating or oscillating forces of short duration caused@ for example@ by seismic or explosive phenomena or by vibration in machinery. In this test the specimen is excited at fixed frequencies with a preset number of sine beats. These fixed test frequencies are predetermined frequencies@ critical frequencies identified by means of a sinusoidal vibration test (IEC 68-2-6) or both. Pauses are provided between the individual sine beats in order to allow decay of the free response of the specimen. Specification writers will find in clause 12 a list of details to be considered for inclusion in specifications and@ in annex A@ the guidance."