Introduction to the use method and fault analysis of sound level meter
How to use the sound level meter
Whether the sound level meter is used correctly or not directly affects the accuracy of the measurement results. Therefore, it is necessary to introduce the use of sound level meters.
1. Precautions
.Read the instruction manual before use to understand the use method and precautions of the instrument.
.Pay attention to the polarity when installing the battery or external power supply, do not reverse the connection. The battery should be removed when not in use for a long time, so as not to damage the instrument due to leakage.
. Do not disassemble the microphone, prevent throwing it, and place it properly when not in use.
.The instrument should not be placed in a place with high temperature, humidity, sewage, dust, air or chemical gas with high content of hydrochloric acid and alkali.
.Do not disassemble the instrument without authorization. If the instrument is abnormal, it can be sent to the repair unit or the factory for inspection.
2. Calibration of sensitivity
In order to ensure the accuracy of the measurement, it should be calibrated before and after use.
Fit the sound level calibrator on the microphone, turn on the calibration power, read the value, adjust the sensitivity potentiometer of the sound level meter, and complete the calibration.
3. Measurement method
When measuring, the instrument should select the correct gear according to the situation, hold both sides of the sound level meter flat with both hands, and the microphone points to the sound source to be measured. Extension cables and extension rods can also be used to reduce the impact of the appearance of the sound level meter and the human body on the measurement. . The position of the microphone should be determined according to relevant regulations.
Analysis and Repair of Common Faults of Sound Level Meter
1. There is no display on the monitor
(1) The internal battery connection is disconnected or the battery contact is not good: solder the connection and replace the battery contact piece.
(2) The battery is damaged: replace the battery.
2. The measurement reading is obviously low or the calibration is less than 94.0dB
(1) Microphone sensitivity is too low or damaged: replace the microphone and recalibrate.
(2) The contacts of the preamplifier are not in good contact with the microphone: clean the contacts
(3) The plug of the preamplifier is not in good contact with the host socket: replace the plug socket.
3. High readings when measuring low sound levels
