1. Mic digital current test: read the current value directly from the tester（ μ A)；

2. Test of microphone sensitivity: first calibrate the sound pressure level of the tester with a standard microphone to 94db, then put the mic to be tested on the calibrated sound cavity port, test the two poles of mic with the test probe (pay attention to the direction of the two probes), pay attention to the working voltage and load resistance of MIC, so as to directly read the sensitivity of 70hzhe and 1kHz from the tester;
3. Directivity test: it shall be conducted in the anechoic room, with B & k2012 tester and B & K rotary table;
4. Test of frequency response curve: it shall be carried out in the anechoic room with B & k2012 tester and B & K rotating table;
5. For S / N test, first test the sensitivity of MIC, and then test the noise of MIC in the anechoic room under the same conditions. Pay attention to the use of dry battery to reduce the test error caused by the use of other power sources, and then calculate: S / N = sensitivity level / noise level, expressed in logarithm;
6. For the test of loud pressure level, use B & k2012 tester to test in the anechoic room, gradually increase the loud pressure level, and observe the distortion value. When the distortion value is equal to 3%, the sound pressure level at this time is the loud pressure level, which is recorded as maxspl. It shall be greater than 115 dbspla.