**The Working Principle and Application of Noise Meters / Sound Level Meters**
LA-3260, LA-3560, LA-3570, LA-1410, LA-1440, LA-4440 – Japanese Ono Noise Meters / Sound Level Meters!
Guangzhou Chengmin Electronic Technology Co., Ltd. specializes in supplying high-quality imported and domestic industrial noise meters and sound level meters. We offer a wide range of products at competitive prices. Welcome to inquire and place your order:
Contact: Liu Gong – 15915719483
Phone: [Insert Phone Number]
Fax: [Insert Fax Number]
QQ: [Insert QQ Number]
**How Do Noise Meters / Sound Level Meters Work?**
A sound level meter measures sound by converting sound pressure into an electrical signal. The microphone captures the sound wave and transforms it into a voltage signal. This signal is then processed through a preamplifier to match the impedance, followed by an attenuator and amplifier for signal adjustment. After frequency weighting (via a network or external filter), the signal is sent to an RMS detector, which calculates the average sound level and displays it on the meter’s indicator. **Key Components of a Sound Level Meter:**
1. **Microphone**: Converts sound pressure into an electrical signal. Common types include crystal, electret, moving coil, and condenser microphones.
- **Moving Coil Microphone**: Consists of a diaphragm, coil, magnet, and transformer. When sound waves hit the diaphragm, it vibrates, causing the coil to move within the magnetic field and generate an induced current. The strength of this current corresponds to the sound pressure level.
- **Condenser Microphone**: Made up of a metal diaphragm and a nearby electrode, forming a capacitor. Sound pressure causes the diaphragm to vibrate, changing the capacitance and producing a voltage signal. These microphones are known for their accuracy and stability, but require a preamplifier due to their high output impedance.
2. **Amplifier**: Amplifies weak signals using two stages—input and output amplifiers. Input and output attenuators adjust signal levels to ensure accurate readings on the display. Most meters operate within a 70dB range.
3. **Weighting Network**: Simulates human hearing sensitivity across different frequencies. Common weightings include A, B, and C. - **A-weighting** is most common, mimicking human ear sensitivity at low sound levels (below 55dB). - **B-weighting** is used for medium levels (55–85dB), and **C-weighting** for high levels (above 85dB). - A-weighting is widely used in environmental and industrial noise measurements due to its close alignment with human perception. However, newer standards like NR and NC are gaining popularity.
4. **Detector and Indicator**: Converts AC signals into DC for measurement. Types include peak, average, and RMS detectors. RMS is most commonly used in noise measurements, as it reflects the effective sound level over time. - **Slow** mode (1000ms) for steady-state noise. - **Fast** mode (125ms) for fluctuating sounds like traffic. - **Pulse** mode (35ms) for long-duration impulses. - **Peak Hold** mode (<20ms) for short, sharp sounds like gunshots or explosions.
For more information or to purchase our high-quality noise meters, feel free to contact us today! **Visit:** http://news.chinawj.com.cn **Image Source:** http://i.bosscdn.com/blog/11/04/36/593987.jpg **Editor:** Hardware Business Network Information Center **Source:** http://news.chinawj.com.cn
LA-3260, LA-3560, LA-3570, LA-1410, LA-1440, LA-4440 – Japanese Ono Noise Meters / Sound Level Meters!
Guangzhou Chengmin Electronic Technology Co., Ltd. specializes in supplying high-quality imported and domestic industrial noise meters and sound level meters. We offer a wide range of products at competitive prices. Welcome to inquire and place your order:
Contact: Liu Gong – 15915719483
Phone: [Insert Phone Number]
Fax: [Insert Fax Number]
QQ: [Insert QQ Number]
**How Do Noise Meters / Sound Level Meters Work?**
A sound level meter measures sound by converting sound pressure into an electrical signal. The microphone captures the sound wave and transforms it into a voltage signal. This signal is then processed through a preamplifier to match the impedance, followed by an attenuator and amplifier for signal adjustment. After frequency weighting (via a network or external filter), the signal is sent to an RMS detector, which calculates the average sound level and displays it on the meter’s indicator. **Key Components of a Sound Level Meter:**
1. **Microphone**: Converts sound pressure into an electrical signal. Common types include crystal, electret, moving coil, and condenser microphones.
- **Moving Coil Microphone**: Consists of a diaphragm, coil, magnet, and transformer. When sound waves hit the diaphragm, it vibrates, causing the coil to move within the magnetic field and generate an induced current. The strength of this current corresponds to the sound pressure level.
- **Condenser Microphone**: Made up of a metal diaphragm and a nearby electrode, forming a capacitor. Sound pressure causes the diaphragm to vibrate, changing the capacitance and producing a voltage signal. These microphones are known for their accuracy and stability, but require a preamplifier due to their high output impedance.
2. **Amplifier**: Amplifies weak signals using two stages—input and output amplifiers. Input and output attenuators adjust signal levels to ensure accurate readings on the display. Most meters operate within a 70dB range.
3. **Weighting Network**: Simulates human hearing sensitivity across different frequencies. Common weightings include A, B, and C. - **A-weighting** is most common, mimicking human ear sensitivity at low sound levels (below 55dB). - **B-weighting** is used for medium levels (55–85dB), and **C-weighting** for high levels (above 85dB). - A-weighting is widely used in environmental and industrial noise measurements due to its close alignment with human perception. However, newer standards like NR and NC are gaining popularity.
4. **Detector and Indicator**: Converts AC signals into DC for measurement. Types include peak, average, and RMS detectors. RMS is most commonly used in noise measurements, as it reflects the effective sound level over time. - **Slow** mode (1000ms) for steady-state noise. - **Fast** mode (125ms) for fluctuating sounds like traffic. - **Pulse** mode (35ms) for long-duration impulses. - **Peak Hold** mode (<20ms) for short, sharp sounds like gunshots or explosions.
For more information or to purchase our high-quality noise meters, feel free to contact us today! **Visit:** http://news.chinawj.com.cn **Image Source:** http://i.bosscdn.com/blog/11/04/36/593987.jpg **Editor:** Hardware Business Network Information Center **Source:** http://news.chinawj.com.cn
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