Nor279 er en trinnlydsball utviklet for trinnlydmåling i lave frekvenser (31,5Hz-500Hz), i henhold til ISO 16283-2 vedlegg A.2 og ISO 10140-5 vedlegg F.2.
- To be used as the “Rubber Ball “ alternative to the Tapping Machine Excitation method in accordance with the ISO 16283-2 Appendix A.2 and the ISO 10140-5 Appendix F.2
- Fulfill the requirements for a “standard heavy impact source” as given in the Japanese JIS A 1418-2:2019 Standard for impact sound insulation
- Hollow sphere ball
- Outside diameter 178mm and thickness 32mm
- Silicone rubber material
- Equivalent mass 2,5 kg (+/- 0,1kg)
- Coefficient of restitution at 0,8 (+/- 0,1)
- Rubber hardness 40o (+/- 5o)
Rubber raw material: Silicon rubber
Shape: Hollow sphere, diameter 178 ±1 mm, wall thickness 32 mm
Equivalent mass: 2.5 ±0.1 kg
Restitution coefficient: 0.8 ±0.1
Rubber hardness: 40º ±5º
Impact force characteristics: Impact force waveform (Example)
