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Robust in a production environment

1st Requirement: Solid hardware

KLIPPEL QC SYSTEM provides a special hardware solution coping with ground loops, electro-magnetic interference, dirty power lines and extreme climate conditions which are typical for a production environment: 

  • XLR balanced inputs and outputs reducing ground loops
  • preamplifiers controlled in 1dB steps to ensure maximal SNR
  • 2 BNC inputs with ICP power for microphone, accelerometers and others
  • 2 speaker terminals to measure tweeter and woofer simultaneously
  • four-wire technique for true voltage and current monitoring
  • galvanically decoupled current sensor with low resistance (0.02 Ohm)
  • current measurement up to 60 Amps 
  • voltage measurement up to 500 V
  • sensor for temperature and humidity for climate monitoring
  • optical decoupled input and output pins (GPIO)
  • voltage control and performance check of external power amplifier
  • self-calibration of the hardware platform.

2nd Requirement: Noise immunity

Testing audio products requires the acoustical measurement of symptoms (Rub & Buzz) which are more than 80 dB below the fundamental component. Production noise can easily exceed those values and produce invalid results. KLIPPEL QC System provides

  • solutions for reliable testing at a high levels of noise
  • high-pressure microphones for near field measurements
  • recommendations for test boxes and shielding.
Noise immunity
KLIPPEL introduced an additional microphone for end-of-line testing which measures the ambient production noise and checks reliably whether the measurement is valid or corrupted by noise.

This information by a novel patent protected technology gives full Production Noise Immunity by performing the following steps:

  • storing the valid parts of each measured response,
  • automatic repetition of corrupted measurement,
  • merging the valid parts of the response,
  • giving a complete valid response eventually.


The module Motor and Suspension Check is completely immune against production noise and dispenses with conventional harmonic distortion measurements.