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MTD - QC 功能扩展选件
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Multi-Tone Distortion (MTD)
Optional Modules for the KLIPPEL QC Framework
功能特点
Multi-tone stimulus and spectrum
Multi-tone distortion summing harmonic and intermodulation distortion
Analysis of input current or sound pressure
Compliant to IEC60268-21
Dedicated to fast-end-of-line testing
„Fingerprint“ testing of speaker and sound systems
Diagnostics using multi-tone distortion
Ensures overall consistency of production
Optional noise floor check
The Multi-Tone Distortion Task (MTD) is an add-on to the QC end-of-line test system. This module can be inserted as a test step (task) in any existing QC test. It is based on multi-tone test signals. Multi-tone stimuli excite not only harmonics distortion (such as chirp signals used in SPL task) but also inter-modulation distortion that provide a much more comprehensive distortion pattern than harmonics alone. Due to the higher number of excited frequencies it is not possible to separate distinct causes and symptoms which as can be done for harmonics and IM distortion analysis. In fact, multi-tone distortion are used to identify a distortion fingerprint which is a meaningful quality measure of audio products since multi-tone stimuli are quite close to normal music signal properties. A multi-tone test can be applied to acoustic (sound pressure) and electric (input current) signals using a microphone or a Klippel Analyzer hardware (PA, KA3). This allows a separation of symptoms caused by the electro-mechanic part of the audio product (current) or includes in addition also vibration and radiation effects (sound pressure).
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