Test the Ultrasonic Microphone

The sensitivity of the ultrasonic microphone can be measured to test its functionality. The Test microphone readout measures the volume of the incoming signal from the ultrasonic microphone with a bandpass filter applied at 40 kHz. This readout is designed for use with the Wildlife Acoustics Ultrasonic Calibrator.

The Ultrasonic Calibrator has two modes of operation:

• CAL: Calibration mode is used to test the microphone sensitivity at close range.

• CHIRP: Chirp mode is used to test the entire system at a distance. In Chirp mode, the Ultrasonic Calibrator emits loud, 40 kHz pulses to simulate a nearby bat. This mode can be used to verify that the recorder is triggering and generating recordings as expected.