The complete article "Quality of noise emission data: An experimental verification for outdoor equipment" can be downloaded at the website of the Sociedad Española de Acústica (SEA) (charges may apply).
F. Heisterkamp, I. Arendt, Y. Büdding:
Quality of noise emission data: An experimental verification for outdoor equipment.
in: Inter-Noise 2019. Noise control for a better environment. Proceedings of Internoise 2019. The 48th International Congress and Exposition on Noise Control Engineering. June 16-19, Madrid Madrid: Sociedad Española de Acústica (SEA) 2019. pages 12