Precautions for using a sound level meter
1. When measuring, the instrument should choose the correct gear according to the situation, hold both sides of the sound level meter flat with both hands, and point the microphone towards the measured sound source. Extension cables and rods can also be used to reduce the influence of the appearance of the sound level meter and the human body on the measurement. The location of the sound level meter should be determined in accordance with relevant regulations.
2. The sound level meter is powered by a battery, and the battery voltage should be checked to ensure it meets the requirements: the function switch of the meter should be set to the "battery" position, and the "attenuator" can be set arbitrarily. At this time, the indication on the meter should be within the rated battery voltage range, otherwise the battery needs to be replaced. Pay attention to polarity when installing batteries or external power sources, and do not reverse connect them. If not in use for a long time, the battery should be removed to avoid liquid leakage and damage to the instrument.
3. Before use, it is necessary to read the instruction manual to understand the usage method and precautions of the instrument. Preheat according to the preheating time specified in the sound level meter user manual (e.g. 10 minutes).
4. When the battery voltage used in the sound level meter is insufficient, it should be replaced.
5. Calibrate amplifier gain: Set the meter function switch to "0" and the "attenuator" switch to "calibrate". At this time, the meter pointer should be at the red line position, otherwise the sensitivity potentiometer needs to be adjusted.
6. When the measured sound level is unknown, the "attenuator" must be placed at the maximum attenuation position (such as 120dB), and then gradually adjusted to the required attenuation position during measurement to prevent the measured sound level from exceeding the range and damaging the sound level meter
7. Do not disassemble the microphone to prevent it from falling, and place it properly when not in use. 8. Expensive components with extremely delicate and easily damaged sensors should be handled with care throughout the entire experimental process. After the experiment is completed, remove the sensor and place it in the designated location.
9. Instruments should be avoided from being placed in places with high temperature, humidity, sewage, dust, air or chemical gases containing high levels of hydrochloric acid and alkali.
10. Do not disassemble the instrument without authorization. If the instrument is abnormal, it can be sent to the repair unit or factory for maintenance.
