Daily Fault Analysis and Solutions of Noise Meter
No display on the monitor
(1) Internal battery wiring disconnected or poor battery contact: Weld the wiring and replace the battery contact piece.
(2) Battery damage: Replace the battery.
The measurement reading is significantly low or cannot be calibrated to 94.0dB during calibration
(1) The sensitivity of the microphone is too low or damaged: replace the microphone and recalibrate it.
(2) The contact between the preamplifier and the microphone is not good: clean the contact.
(3) The plug of the preamplifier is not in good contact with the host socket: replace the plug socket.
The reading is too high during low sound level measurement
(1)
Tighten the outer sleeve.
Poor ground contact of preamplifier
Tighten the outer sleeve.
There are three standard weighting networks for frequency in noise meters: A, B, and C.
The A network simulates the response of the human ear to a 40 square pure tone in an equivalent sound curve, and its noise meter curve shape is opposite to the 340 square equivalent sound curve, resulting in significant attenuation in the middle and low frequency bands of the electrical signal;
B network simulates the response of the human ear to 70 square pure tones, which causes a certain attenuation in the low-frequency range of electrical signals;
The C network simulates the response of the human ear to 100 square tones, with a nearly flat response across the entire audio frequency range.
