G.R.A.S. Sound and Vibration Model 45CA Hearing Protector Test Fixture


The G.R.A.S. Hearing-Protector Test Fixture Type 45CA is for testing the performance of hearing-protection devices such as ear plugs and ear muffs (supra-aural as well as circumaural). It conforms with ISO 4869-3 and can be used with one1 or two2:

  • WS1P or WS2P microphones respectively 1-inch or ½-inch (with adapter, e.g. RA0017)
  • IEC 60318 Ear Simulators (RA0039)

It can also be fitted with IEC 60711 Ear Simulators (RA0045) and a range of moulded-rubber Ears for testing ear plugs.
The Test Fixture is mounted on a resilient base which reduces the noise floor to a minimum in a typical test situation.
Download PDF Data Sheet: pd_45CA_ver_29_june_2012

1 For monaural measurements
2 For binaural measurements
3 Minimum required as in Figure 1 of ISO/DIS 4869-3


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