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Test condition makes the impact on the sensitivity of microphone

 

Generally speaking, the sensitivity of the microphone will increase when we raise the impedance at 2.2K of RL, the results as the graph 1 & 2.

The sensitivity also rises if we give higher voltage to the microphone, graph 3 & 4.

testing circuit

RL = 2.2K / 3.0K

microphone testing 1

RL = 2.2K / 1.0K

microphone testing 2

Voltage = 2V / 4.5V

microphone testing 3

Voltage = 2V / 1.2V

microphone testing 4

Equipment : B&K 2012 + B&K 4227

Microphone : 6.0mm x 2.7mm -42+/-3 dB