Development team optimizes test equipment: New all-rounder for acoustic measuring devices
A glimpse into our development department and its work on the prototype of an optimized pressure chamber calibrator. In the future, it will be possible to measure and calibrate an even wider range of acoustic measuring devices quickly and easily.
In the field of acoustic engineering and measurement, a wide frequency range and high sound level are of paramount importance. The SPEKTRA development team is currently working on a new pressure chamber calibrator for ½” microphones and similar devices, including sound level meters. Building on the success of its predecessor, the SQ-4.2, this optimized and completely redesigned acoustic coupler will offer many advanced features to meet the evolving needs of professionals in the field.
How does an acoustic coupler work?
An acoustic coupler is a test device that can be used to test and calibrate acoustic measuring equipment such as measuring microphones, sound level meters, artificial ears or dosimeters.
It is based on the principle of a pressure chamber, in which the device under test and a reference standard are placed opposite each other in a very small chamber at a short distance from each other. A pressure sound field that is as uniform as possible is generated in this chamber. Since the transmission behavior of the reference standard is known, the sound pressure in the chamber can be deduced from its output voltage and the test specimen can be compared with it at the same time.
What were the key targets for the development?
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High sound pressure level over wide frequency range:
114 dB - 16 Hz ... 20 kHz
145 dB - 16 Hz ... 5 kHz -
Low distortion:
Maintaining signal integrity for precise results -
Compact design:
Efficient handling without compromising on performance
Which measurands can be calibrated?
Our coupler is suitable for various measuring devices, e.g. for ½” microphones, sound level meters or intensity probes.
This results in a wide range of possible applications, which also cover the majority of calibration tasks in the SPEKTRA acoustics laboratory. From the calibration of pressure sensitivity to phase calibration and the characterization of microphones, including the measurement of complex transfer functions and distortions, the newly designed coupler is suitable for various scenarios.
Impressive highlights
- integrated clamping jig facilitating direct fixation and sealing for enhanced stability and accuracy
- variable sealing ring position - adaptable for different protection grills and pressure-balancing capillaries
- fully symmetric electroacoustic topology ensuring a more uniform sound field for reliable results
- electrical insulation, safeguarding the device under test (DUT) and reference device from potential interferences
- compact design of 45 mm × 60 mm
Conclusion
Built in accordance with the international norm IEC 61094-5:2001, our coupler will not only adhere to established standards for pressure calibration of microphones but also pave the way for new challenges - guaranteeing compatibility and reliability.
In conclusion, the future generation of acoustic couplers will represent a leap forward in acoustic measurement technology. With its significantly improved performance, extended use cases and reliability, this promises to empower professionals across industries to achieve precise results more efficiently in their endeavors.
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We are your partner for measurement tasks in acoustics and audiometry.
Phone: +49 351 400 24 0 | Email: sales@spektra-dresden.com
