- Optimal for measurements of transducers and audio systems
- Considers mechanical, electrical, acoustical signals
- Measures voice coil temperature
- Visualizes amplitude compression
- Detects critical speaker distortion
- Assesses maximal output
- Thermal and mechanical protection
- Adjusts voltage at speaker terminals
- Detects amplifier gain automatically
This module performs a series of steady-state measurements by using a single- or two-tone excitation signal varied in frequency and voltage. Two signals may be measured simultaneously (e.g. current, voltage, displacement, SPL). Due to high quality converters and synchronous data acquisition, the spectral components (fundamental, harmonic and intermodulation distortions, DC part) can be obtained with high signal to noise ratio up to 48 kHz signal frequency. After performing the measurement (voltage and frequency sweep), the magnitude of the spectral components is displayed in a 3D or 2D plot versus voltage and frequency of the excitation tone.
The 3D-Distortion Measurement (DIS) provides features especially valuable for transducer measurements. The transducer can be protected against mechanical and thermal overload by pausing the measurement automatically if the total harmonic distortion or the increase of the voice coil temperature violates user defined limits.
DC displacement – dynamic offset the voice coil
Compression of fundamental components
Separated loudspeaker distortion
Voltage and current
Voice coil temperature
Waveform and spectrum
Magnitude and phase response
Far field sound pressure on-axis
Near field measurement
provides all standard measurements according to IEC 60268-5.
provides amplitude modulation distortion in addition to the functionality of the DIS Standard.
The figure illustrates the measurement of the maximal SPL level at a defined THD limit (1, 5 and 10 percent) using DIS measurement and a post-processing module. The DIS module varies the amplitude of the stimulus and protects the transducer under test against mechanical and thermal overload. The post-processing module extracts the measurement results of the DIS automatically and calculates the corresponding SPL limits. An object template is available for this application in dB-Lab called “Max SPL limited by THD; IEC 60268-21".
Operation and/or object templates for this module are available when creating a new operation or object in dB-Lab. This provides application specific setups and standard conforms tests.
Please find details on templates in Application Note AN 1001.
Other Modules of the R&D and QC System
Consumer Electronics Association
CEA-CEB19, CEA-803 R200X, CEA-2006-A, CEA-2019, CEA-2031
International Electrotechnical Commission
IEC 60268-1, IEC 60268-3, IEC 60268-4, IEC 60268-5, IEC 60268-7, IEC 60268-21, IEC 60268-22, IEC 61094-5, IEC 61305-5, IEC 61842, IEC WD 63034
BS EN 54-24, BS EN 50332
Audio Engineering Society
Institute of Electrical and Electronics Engineers
IEEE 269, IEEE 1206, IEEE 1329, IEEE 1652
American National Standards Institute
ANSI S1.15-Part 1, ANSI S1.15-Part 2, ANSI S3.7, ANSI S3.22, ANSI S3.25, ANSI S12.42
International Telecommunication Union
ITU-R Recommendation BS. 775-2, ITU-R Recommendation BS. 1116, ITU-R Recommendation BS. 1534-1, ITU-T Recommendation P.79
Telecommunications Industry Association
TIA-470, TIA-810, TIA-920
American Society for Testing and Materials