Precautions for use of sound level meter
1. 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 appearance of the sound level meter and the measurement of the human body. Impact. The use position of the sound level meter shall be determined according to relevant regulations.
2. The sound level meter is powered by batteries. Check whether the battery voltage meets the requirements: the function switch of the ammeter is set to the "battery" position, and the "attenuator" can be set arbitrarily. At this time, the indication on the ammeter should be within the rated battery voltage range, otherwise The battery needs to be replaced. Pay attention to the polarity when installing the battery or external power supply, and 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.
3. Read the instruction manual before use to understand the use method and precautions of the instrument. Preheat according to the preheating time specified in the instruction manual of the sound level meter (for example, 10 minutes).
4. When the voltage of the battery used by the sound level meter is insufficient, it should be replaced.
5. Calibrate the amplifier gain: set the function switch of the ammeter to "0" and set the "attenuator" switch to "calibration". At this time, the pointer of the ammeter should be at the red line position, otherwise the sensitivity potentiometer needs to be adjusted.
6. When you don't know how big the measured sound level is, you must put the "attenuator" at the maximum attenuation position (for example, 120dB), and then gradually adjust it to the attenuation position required by the measured sound level during measurement to prevent the sound level from being measured. The sound level exceeds the range and damages the sound level meter
7. Do not disassemble the microphone, prevent it from being thrown, and place it properly when not in use. 8. The sensor is an extremely delicate and easily damaged relatively expensive part, so handle it with care during the entire experiment. After the experiment, remove the sensor and put it in the designated place.
9. 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.
10. 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.
