Noise monitoring instruments are core equipment for environmental noise monitoring. The accuracy of their measurement data directly affects noise enforcement and management decisions. Regular calibration and maintenance are essential to ensure proper operation.
I. Calibration Interval
Suggested Calibration Interval:
New device: Calibration required before use
Normal use: Calibrate every 6 months.
Frequently used: Calibrate every 3 months
Law Enforcement Monitoring: Perform acoustic calibration before each use
2. Calibration Method
1. Sound Calibrator Calibration Method
This is the most common calibration method, using a standard acoustic calibrator to calibrate the noise monitor.
Calibration Steps:
Place the sound calibrator over the microphone.
Enable the sound calibrator to generate 94 dB or 114 dB standard sound pressure.
Read noise monitor display value
Adjust the instrument gain until the displayed value matches the standard value.
Record deviation values before and after calibration
2. Pistonphone Calibration Method
The pistonphone generates more precise reference sound pressure levels for high-accuracy calibration.
Calibration Steps:
Connect the pistonphone to the microphone.
Activate the pistonphone to generate 25 Hz and 12 dB SPL.
Read noise monitor display value
Calculate and correct deviations
3. Comparison calibration method
Compare measurements using a standard noise monitor and the instrument to be calibrated.
Calibration Steps:
Place both instruments in the same location.
Simultaneously measure the same noise source
Compare measurement results from both instruments
Calculate and correct deviations
3. Daily Maintenance
1. Microphone Maintenance
The microphone is the core component of the noise monitor and requires special care during maintenance:
Periodically clean the microphone surface by gently brushing away dust with a soft brush.
Avoid touching the microphone diaphragm with your bare hands.
Prevent moisture and water damage to the microphone.
Regularly inspect the windscreen and replace it if damaged.
2. Host Maintenance
Regularly check battery level; charge or replace as needed.
Keep the device dry. Do not use in rain.
Regularly clean the display and buttons
Check data storage functionality and back up data promptly.
3. Attachments Maintenance
Check if the tripod is stable
Check if the cable is damaged.
Check that the rain cover is intact.
Clean carrying case regularly
IV. Common Troubleshooting
Fault 1: Abnormally high or low measured value
Cause: Microphone contamination or damage
Action: Clean or replace the microphone
Error 2: Device won't turn on
Reason: Battery depleted
Action: Charge or replace battery
Error 3: Failed to save data
Reason: Memory card is full or corrupted.
Resolve: Clear storage space or replace the SD card
Error 4: Communication failed
Cause: Damaged communication cable or loose connector
Troubleshooting: Check communication lines and interface connections
5. Maintenance Record Management
Maintaining comprehensive maintenance records helps track equipment status:
Calibration Date and Results
Maintain projects and content
Replacement Parts List
Incident Resolution Log
Next Maintenance Schedule