Data Harvest 1145 Manuel - Page 11

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1145 - Wireless Sound Level Sensor

points from left to right and the energy is also transferred from left to right. It's these vibrating air

molecules that cause the human eardrum to vibrate, which the brain interprets as sound.

The amplitude of a wave is the maximum displacement of a particle from rest. The louder the sound,

the larger the amplitude wave.

Wavelength is defined as the distance between two successive particles that are at exactly the same

point in their paths and are moving in the same direction (same phase). It is given the symbol λ and is

measured in metres.

The frequency of a wave is the number of complete cycles or oscillations of disturbance each second.

The SI unit of frequency is Hertz (Hz).

Pitch depends on the frequency of the sound waves. Making the pitch higher increases the

frequency.Different musical instruments playing the same note can produce different waveforms.

Conversion to Pascals

Sound pressure is the difference between the instantaneous pressure at a point in the presence of a

sound wave and the ambient atmospheric pressure. The SI unit of sound pressure is the pascal (Pa).

To find the value of the pressure wave that caused the sound (approx.), record data using the mV (or

the amplitude) range. Find the maximum amplitude and divide this by 7.9433 to convert to pascals (Pa).

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