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Sound Pressure Task (SPL)

Task of the QC STANDARD Software and optional module for the R&D System

Features and Benefits

  • Measurement module for the Klippel Analyzer System
  • Optimized for quality control applications, such as end-of-line testing
  • Included in the Klippel QC Standard Software package
  • Fast testing with high sensitivity: amplitude and speed shaping (testing from 200 ms for full bandwidth)
  • Production noise detection to avoid false rejects
  • Limits, grades for all measures
  • Online yield, Cpk/Ppk, control rules
  • Comprehensive analysis based on chirp / sine sweep for acoustic, mechanical and electrical signals according to IEC 60286

    • Amplitude frequency response, opt. windowing
    • Average level, multiple band level
    • Phase, polarity, time delay
    • Harmonic distortion (THD, 2nd-5th)
    • Track down defects: Rub&Buzz, HOHD, air leakage noise

The Sound Pressure Task (SPL) is a universal measurement task optimized for QC applications for all kinds of electrical, mechanical and acoustical signals in the time and frequency domain. The excitation signal is a logarithmic chirp that allows very fast testing of the most important acoustic characteristics over the full bandwidth in no more than 200 ms according to IEC standard 60268-5 and 21. The chirp signal provides a dense excitation spectrum, giving higher frequency resolution than a stepped sine sweep.
The SPL offers outstanding sensitivity for all kinds of distortion caused by undesired dynamics (e.g. rocking modes), manufacturing problems and defects (e.g. Rub & Buzz). Detecting defects with the highest sensitivity requires robustness against any external noise from production (EoL) or in a lab environment (RnD) which is included in this task.


Optional Extensions

Options operate as plug-ins and extend the functionality of this task. 
No additional test time is required, all options use or modify the excitation of this task. 

Add-Ons (to purchase):
Meta Hearing Technology (MHT):
  Defect detection beyond human hearing
Production Noise Immunity (PNI):
  Coping with noisy environment
External Synchronization (SYN):
  Synchronize digital audio (e.g. Bluetooth) and trigger open-loop tests
Air Leak Detection (ALD):
  Detect air leaks in transducers and audio systems
Spectrogram 3D Limits (3DL)
  Powerful and intuitive defect (Rub&Buzz) analysis based on auditory time/frequency (spectrogram) analysis
Dynamic DC Check (DCX):
  Measurement of AC/DC displacement with laser (DC input modification of Production Analyzer hardware
• Hi-2 Distortion Measurement (Hi-2):
  Blat-Distortion (free)
• Perceptive Metrics based on the Human Ear (QC-EAR)

Features Libraries (free of charge):
Calculate SPL Resonances
Provides resonance frequency and peak value for peaks in definable bands. 
  Can be checked against limits.
Sequence Control: 
   Repeats or skips measurement tasks with or without user interaction.
Square Wave Stimulus: 
Provides square wave chirp instead of sine chirp.


Test Hardware (capture and/or playback hardware)
KLIPPEL Analyzer (KA3)
Production Analyzer (PA) or 3rd party audio interface (sound card)

License Dongle (USB)

Included in QC Standard from version 1.0
Not available for QC Basic
Available as module for R&D Software 210 or higher (+SPL license)

Power Amplifier
    - KA3 QC Card or Amp Card (opt.) or 
    - External, 3rd party Amplifier

Related Information

Other Modules of the QC System
Sound Pressure and Impedance (SPL-IMP):
   Combined measurement of acoustic and electric characteristics based on sine sweep chirp
Spectrum Analysis (SAN)
   FFT spectrum, frequency response, A-weighted SPL and distortion with/without noise generator or 
   user-defined stimulus for noise & vibration or audio system testing
Match Speaker Tool (MSP):
   Find best matching pairs from a pool of speakers
Statistics (STAT):
   Statistical overview of Klippel measurement data (1D and 2D data), poolbased visualization of measures allows 
   quick assessment of variances and comparisons between test object groups

Related Products
Transfer Function Measurement (TRF):
   Measurement of transfer function and harmonic distortion
Time Frequency Analysis (TFA):
   3D visualization tool vs. time and frequency for impulse and time responses using wavelets, filter-bank or STFT
Live Audio Analyzer (LAA):
   Long-term monitoring of 5 signals simultaneously, examine time and frequency data, heating and ageing,
   measure distortion with music or arbitrary stimulus

Examples of Typical Applications
Driver Test Setup 
Passive System Test Setup
Active 2.1 System with Electrical and Acoustical Testing
5.1 System with Electrical and Acoustical Testing
Microphone Test Setup
Alternate Test Setup
Headphone Testing 


Consumer Electronics Association 
CEA-CEB19, CEA-803 R200X, CEA-2006-A, CEA-2019, CEA-2031, CEA-2034 (ANSI)

International Electrotechnical Commission
IEC 60268-1, IEC 60268-3, IEC 60268-4, IEC 60268-5, IEC 60268-7, IEC 60268-16, IEC 60268-21, IEC 60268-22, IEC 61094-5, IEC 61305-5, IEC 61842, IEC WD 63034

European Standards 
BS EN 54-24, BS EN 50332

Audio Engineering Society 
AES2-1984, AES2-1984, AES17-2009, AES56-2008, AES X223, AES X241

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

International Organization for Standardization 
ISO 266:1997, ISO 4869-3

Telecommunications Industry Association 
TIA-470, TIA-810, TIA-920

American Society for Testing and Materials 
ASTM F2504-05