El funcionamiento principio de medir ruido con a sonido nivel medidor.
There are three standard weighting networks in sound level meters: A, B, and C. The A network simulates the response of the human ear to a 40 square pure tone in the equivalent response curve. Its curve shape is opposite to the 340 square equivalent response curve, resulting in significant attenuation in the middle and low frequency bands of the electrical signal. The B-network simulates the response of the human ear to 70 square pure tones, which attenuates the low-frequency range of electrical signals to a certain extent. The C network simulates the response of the human ear to 100 square pure tones, with a nearly flat response throughout the entire audio frequency range. The sound pressure level measured by the sound level meter through a frequency weighting network is called the sound level. Depending on the weighting network used, it is called the A sound level, B sound level, and C sound level, with units recorded as dB (A), dB (B), and dB (C).
(1) Lento. El tiempo constante de el metro cabeza es 1000 ms, usualmente usado para medir estado-estacionario ruido, y el valor medido es el efectivo valor.
(2) Rápido. El tiempo constante de el metro cabeza es 125ms, que es generalmente usado a medidor inestable ruido y transporte ruido con significativo fluctuaciones. El rápido engranaje aproximaciones el humano oído's respuesta a sonido.
(3) Pulso o pulso mantener. El aumento tiempo de el reloj aguja es 35ms , usado para medir pulso ruido con más largo duración , tal como punzonado máquinas , prensa martillos , etc. El medido valor es máximo efectivo valor.
(4) Peak Hold. The rising time of the watch needle is less than 20ms. It is used to measure pulse sounds with a short duration, such as guns, guns, and explosions. The measured value is the peak value, which is the maximum value.
The sound level meter can be connected to an external filter and recorder for spectral analysis of noise. The domestically production ND2 precision sound level meter is equipped with an octave bandpass filter, which is easy to carry to the site and perform spectral analysis.
Sonido nivel metros puede ser dividido en precisión sonido nivel metros and ordinario sonido nivel metros basado en precisión. El medidor error de a precisión sonido nivel meter es about 1dB, while that of a regular sound level meter is about 3dB. Sound level meters can be divided into two categories according to their purpose: one is used to measure steady-state noise, and the other is used to measure instable noise and and pulso ruido.
An integral sonido nivel metro es usado a medidor el equivalente sonido nivel de inestable ruido sobre un periodo de tiempo. A ruido dosímetro es también an integral sonido nivel metro, principalmente usado a medidor ruido exposición.
Pulso sonido nivel medidores son utilizados para medir pulso ruido , que corresponden a la respuesta de humano oído a pulso sonido y el promedio tiempo de humano oído 's respuesta a pulso sonido.
