Precautions to be taken when testing products in a silent testing room
When conducting product testing in a soundproof testing room (anechoic chamber), in order to ensure the accuracy and reliability of the test results, the following key points need to be noted:
1. Environmental preparation
1. Keep quiet: Before testing, ensure that there are no external noise sources in the soundproof room. Turn off all devices that may produce sound, such as air conditioning, ventilation systems, computers, etc.
2. Temperature and humidity control: The temperature and humidity inside the soundproof room should be kept stable to avoid affecting the test results. It is usually recommended to control the temperature between 20-25 ° C and the humidity between 40% -60%.
3. Clean the environment: Before testing, thoroughly clean the floor, walls, and equipment surfaces in the soundproof room to avoid dust or other debris from interfering with the test.
2. Equipment calibration
1. Calibration of acoustic equipment: Before use, calibrate all acoustic testing equipment (such as sound level meters, spectrum analyzers, etc.) to ensure that their measurement accuracy meets relevant standards (such as GB/T 3785 "Sound Level Meters").
2. Calibration standards: Use a standard sound source for calibration and record the calibration data to ensure the traceability of measurement results.
3. Product installation and fixation
1. Stable installation: Install the product to be tested firmly on the test bench in the soundproof chamber to avoid affecting the test results due to vibration or shaking.
2. Vibration reduction measures: If the product generates significant vibration during operation, vibration reduction pads or suspension devices should be used during installation to reduce the impact of vibration on test results.
3. Simulate actual usage environment: Based on the actual application scenario of the product, simulate its load, speed and other parameters in the real usage environment.
4. Precautions during the testing process
1. Ensure product operation status: Before testing, ensure that the product is in normal operation and reaches stable working conditions (such as temperature, speed, etc.).
2. Avoid interference: During the testing process, avoid any possible sources of interference. Testers should keep quiet and avoid walking or talking.
3. Multi point measurement: In order to comprehensively evaluate the noise characteristics of the product, multiple measurement points (such as front, side, rear, etc.) are arranged in the soundproof room to measure the sound pressure level and frequency components at different positions.
4. Record measurement data: Detailed records of the parameters measured each time (such as measurement distance, sound pressure level, frequency components, etc.), and indicate the operating status of the product (such as speed, load, etc.).
5. Repeated measurement: In order to improve the reliability of the measurement results, it is recommended to conduct multiple measurements and take the average as the final result.
5. Data processing and analysis
1. Subtract background noise: Subtract the background noise value of the anechoic chamber from the measurement results to obtain more accurate noise measurement results.
2. Spectrum analysis: Conduct spectrum analysis on the measured noise signal to determine the main frequency components and their distribution of the noise.
3. Result comparison: Compare the measurement results with relevant standards or specified values to evaluate whether the noise performance of the product meets the standards.
4. Noise source localization: Determine the main noise source of the product by analyzing the spatial distribution and frequency characteristics of the noise signal.
6. Safety measures
1. Hearing protection: When conducting tests in high noise environments, testers should wear earplugs or other hearing protection devices.
2. Equipment safety: Avoid equipment damage or personnel injury caused by improper operation. Special attention should be paid to safety when operating heavy or high-temperature equipment.
3. No eating and smoking: Eating and smoking are prohibited in the soundproof room to avoid affecting the testing environment and measurement results.
7. Report and Summary
1. Write a test report: Organize the testing process, measurement data, and analysis results into a detailed test report.
2. Propose improvement suggestions: Based on the analysis of noise sources, propose corresponding noise reduction measures and optimization suggestions.
3. Archiving and filing: Archive and file the test report and related data for future reference and retrieval.
8. Regular maintenance and updates
1. Equipment maintenance: Regularly inspect and maintain the sound-absorbing materials, testing equipment, etc. in the soundproof room to ensure that they are in good working condition.
2. Technical updates: With the development of technology, timely update and upgrade testing equipment and analysis software to improve testing efficiency and accuracy.
9. Comply with relevant standards and regulations
1. Adhere to standards: During the testing process, strictly follow the relevant acoustic measurement standards (such as GB/T 4214 "Methods for Testing Noise from Household and Similar Electrical Appliances").
2. Compliance with regulatory requirements: Ensure that the test results comply with national or regional noise emission standards and regulatory requirements.
10. Teamwork and Communication
1. Team collaboration: During the testing process, multiple parties need to collaborate, such as testers, technicians, data analysts, etc., to ensure smooth connection between each link.
2. Timely communication: Any abnormal situations or problems found during the testing process should be communicated in a timely manner and corresponding measures should be taken.
By strictly implementing the above precautions, conducting product noise testing in a silent testing room can obtain accurate and reliable measurement results, providing strong support for product optimization design and quality control.
