Application Scenarios of BOLYFA BT2.8P Manual Audio Air Tightness Testing Equipment
Small - scale digital products：For in - ear headphones, mini Bluetooth speakers etc, it tests air tightness of casings and internal parts. This ensures good waterproof and dust - proof effects in daily use, extends product lifespan and improves user experience.
Simple mechanical parts：Used for small - scale engine cylinder blocks and simple sealed containers. Checks for significant leakage to guarantee stable operation of related mechanical equipment, preventing malfunctions from leakage that could disrupt production and work.
Educational and scientific research fields：In school experimental teaching, it helps students understand air tightness testing principles and operation, enhancing practical skills and knowledge. In scientific research, for preliminary projects or principle verification with less strict air - tightness needs, it aids researchers in completing tasks.
BT2.8P Manual Audio Air-Tightness Testing Equipment offers a wide range of test items, including frequency response, harmonics, total harmonic distortion (THD), total harmonic distortion plus noise (THD+N), abnormal sounds, debris noise, noise, and signal-to-noise ratio (SNR). Additionally, it can measure the directional characteristics of microphones and display them intuitively in polar coordinate graphs. However, some of the above tests require the corresponding optional software modules to be performed.
Currently, the BT2.8P Manual Audio Air-Tightness Testing Equipment is primarily used for testing the frequency response of the main and secondary microphones, receivers, and earpieces in mobile phone mid-frames and front shells. The specific test items are mainly divided into the following three aspects:
1. Blocked Holes:
◦ When a hole is blocked by more than one-third, the volume of the sound cavity changes, significantly blocking high-frequency sounds in the range of 20Hz to 20kHz, resulting in a sharp attenuation.
2. Burrs (Foreign Objects):
◦ The impact of burrs is similar to that of blocked holes. Although the change in the sound cavity is not significant, it is sensitive to specific frequency ranges. Typically, it can cause resonance (increased sound pressure at that frequency) or sound attenuation, generally within the 20Hz to 20kHz range. The sensitive frequency range is also related to the material.
3. Sound Leakage (Air Leakage):
◦ Poor sealing of the sound cavity can easily lead to sound leakage, reducing the sound pressure in the cavity. This phenomenon is particularly noticeable in low-frequency sounds, with significant changes occurring in the 20Hz to 20kHz range.
Testable Items: Frequency response, harmonics, total harmonic distortion (THD), total harmonic distortion plus noise (THD+N), abnormal sounds, debris noise, noise, and signal-to-noise ratio (SNR). When used in conjunction with the equipment, it can measure the directional characteristics of microphones and display them in polar coordinate graphs.
Test pressure range: 0 - 500kPa
Pressure accuracy: ±0.1kPa, ±0.5kPa, etc.
Audio detection range: 20Hz - 20kHz
Audio sensitivity: -40dB to -60dB
Test time: 5s - 600s
Inflation time: 5s - 30s
Pressure holding rate: over 90%
Interface types: quick - connect fittings, threaded interfaces, etc.
Display resolution: pressure display resolution 0.1kPa, time display resolution 1s, etc.
Equipment dimensions: 300mm×200mm×150mm
Equipment weight: around 5kg
Power requirements: 220V AC or 12V DC, 100W - 300W
