I. Overview
The MegaSig AC 05 is a sound level calibrator designed for field measurements and routine laboratory validation. It was designed to provide engineers with a lightweight (only 140g), intuitive, and adaptable calibration tool.
It features a built-in feedback microphone technology, which can monitor and adjust the output sound pressure level in real time, ensuring a highly stable sound pressure output under different load volumes. The AC 05 supports dual sound pressure levels of 94dB/114dB and dual frequency selection of 250Hz/1kHz , meeting the calibration needs of most sound level meters and electroacoustic measuring instruments.
II. Core Functions and Technological Advantages of the Product
The AC 05 design emphasizes a balance between “multi-functionality” and “stability,” with the following key technical highlights:
1. Dual SPL and Dual Frequency Output
- Sound Pressure Level (SPL): Offers two options: 94 dB SPL and 114 dB SPL . 94 dB is suitable for microphone calibration with general sensitivity, avoiding overload; 114 dB provides a high signal-to-noise ratio, allowing for easy calibration even in noisy factory environments.
- Frequency: Supports switching between 250 Hz and 1000 Hz . Compared to traditional calibrator that only support 1 kHz, the addition of the 250 Hz option allows engineers to check the microphone’s response in the low-frequency range.
2. Wide compatibility
- Size compatibility: The AC 05 is compatible with the full range of microphones, including 1-inch, 1/2-inch, 1/4-inch, and even 1/8-inch microphones , via an adapter . This is extremely convenient for laboratories that have both standard measurement microphones and miniature microphones.
3. Intelligent operation and energy-saving design
- Automatic power off: The device will automatically power off when the calibrator is removed from the microphone.
- Accuracy indicators: sound pressure level accuracy is controlled within ± 0.2 dB , frequency accuracy is ± 0.7%, and total harmonic distortion plus noise (THD+N) is less than 2%, meeting the stringent requirements of precision measurement.
III. Usage Scenarios
- Sound level meter field verification: Before conducting noise regulation measurements, quickly check the sound level meter using the 94dB setting on AC 05 to ensure data validity.
- Microphone sensitivity calibration: When connected to analyzers such as MegaSig PM 6181, the software can automatically calculate and update the microphone sensitivity (Sensitivity, mV/Pa) by using the 1kHz standard audio source input of AC 05 to input the microphone.
- High-noise environment test: In environments with high background noise, such as factories or machine rooms, switch to the 114 dB level to ensure that the calibration signal is much higher than the background noise, thus ensuring calibration accuracy.
IV. Specifications
| Overall parameters | |
| sound pressure level | 94dB/114dB ± 0.2dB (0dB=20μPa) |
| frequency | 250Hz/1000Hz ±0.7% |
| Total Harmonic Distortion | <2% |
| Battery | 1.5V |
| Temperature range | -10℃ – +50℃ |
| relative humidity | 0 – 90% |
| Size (mm) | 94*52*40 |
| net weight | 140g |
V. Conclusion
MegaSig AC 05 is a comprehensive, lightweight, and durable sound calibration tool.
If you need a high-precision calibrator that can provide dual frequency calibration at 250Hz and 1kHz and is compatible with microphones ranging from 1/8 inch to 1 inch, the AC 05 is the most practical and cost-effective choice.
Need further planning consultation for your project? Feel free to contact us anytime for technical discussions.