Quality assurance

AN4428

6/18

DocID025706 Rev 1

1.1.13

Air compression

This test consists of applying high-pressure air into the sound inlet of the microphone. This

application of compressed air is repeated five times for 1 sec from different distances. The

test is performed using an air gun and its purpose is to check the robustness of the MEMs

membrane. The device passes the test if there is no variation of the sensitivity.

Figure 1. Air compression test