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Comprehensive Testing

Comprehensive testing

The KLIPPEL QC simplifies testing using flexible sequences for the comprehensive assessment of all kinds of audio devices such as transducers, active, wireless and passive systems, amplifiers and multi-channel products. Third party audio interfaces and KLIPPEL multiplexers enable testing of any analog or digital, single or multi-channel devices. Hardware and software interfaces are used to communicate with intelligent devices or the production environment.

Linear Measurements

  • Magnitude and phase of fundamental frequency response
  • Windowed impulse response
  • Polarity (acoustic phase) at selected frequencies
  • Sensitivity in specified frequency range
  • SPL of selected frequencies or bands
  • Variety of test signals: sine sweep, noise, single + multi-tone, WAVE file
  • Sweep amplitude profile to ensure optimal SNR

Distortion Measurements

  • Harmonic Distortion: 2nd - 5th harmonic, THD, HI-2 (weighted harmonics), HOHD (high-order harmonic distortion)
  • Impulsive Rub & Buzz distortion analysis superior to steady state measurement
  • Sweep with speed profile – spend test time in critical frequency range
  • Incoherence

Parameter Measurement

  • Thiele/Small parameters: RefsQtsQesQms
  • Other linear parameters: LeCmesLcesRes
  • Vented box parameters: Qb, fb
  • Thiele/Small parameters by added mass technique or laser displacement measurement (TSX add-on): BlMmsVasKmsCmsRms

Application to a Wide Range of Test Objects

  • Any kind of transducer (moving coil, electro-static, piezo, balanced armature)
  • Drivers mounted in sealed or vented enclosures, horns, car bodies, ...
  • Audio electronics (amplifiers, DSP)
  • Single to multi-channel loudspeaker system
  • Stand-alone playback devices (smart phone, smart speaker)
  • System with digital and acoustical delay (Bluetooth speaker)
  • Passive and active systems with analogue and digital interface (USB headphone)
  • Microphones, Headsets
  • 0.5 Ω up to 20 kΩ impedance: (automotive, 100 V PA speaker)
  • 1 mW to 1kW power (telecommunication, professional application)
  • 1 mA to 15 A current (microphone, shakers)
  • 5 Hz … 90 kHz frequency range (subwoofer, high-end tweeter)