NTi Audio
Microphone Test Solution

Microphone Testing

The turnkey microphone test solution provides an extensive test with short test cycle times. The solution is provided by the FX100 and operated via the RT-MicFX software. It provides a comprehensive set of measurements for the quality control of microphone components or assembled products, such as mobile phone microphones, headsets or pro audio microphones.

  • Accurate and repeatable measurements
  • Turnkey solution with flexible user interface in selectable languages English, Chinese, Japanese, Korean and German
  • Short test cycle time, typically < 2 seconds
  • Dedicated for R&D and automated production lines
  • Scalable test architecture with dual channel measurements and optional switchers for sequential testing of one or more microphones
  • Built-in Phantom power and ICP supply

Polar Plot

The polar plot analysis with the NTi Audio precision turntable complements the microphone measurement system to an all-in-one solution. The polar diagram displays the directional characteristic related to the measurement frequency of the microphone. For detailed analysis, the measurement angles can be set to a resolution of less than 1°.

The high-speed FX100 Audio Analyzer generates a series of fast sweep signals, covering the complete audio band from 5 Hz – 80 kHz, and turns the microphone to the configured angles between the sweeps. The measurement time is halved by choosing the 180° mode, which mirrors the polar image. The polar plot graphics can be adjusted after the completed measurement, thus the microphone test system offers full flexibility for post-processing.

FX100 Microphone Test Software Polarity Plot

Turn-key Solution

The design of the FX100 Audio Analyzer follows the key requirements for production testing: Flexibility, speed and ease of integration.


The scalable hardware concept allows customization of the FX100 hardware according to the individual requirements. Plug-in options offer full flexibility such as additional measuring channels, input and output switchers or impedance measurement modules. The audio analyzer grows with the application for manually-operated and fully-automated production lines.

Measurement Speed

Fast GlideSweeps obtain all relevant measurement results from one short stimulus, typically less than a second. The FX100 has been optimized for factory noise immunity and high volume production. The sequence mode provides automated measurement of customized test sequences including Pass/Fail decision.

Ease of Integration

The FX100 Audio Analyzer bridges the demands of QC engineering for using the same instrument in R&D, sample inspection and on the production floor. Individual application projects may be transferred around the globe for fast setup.


All measurement data may be logged for detailed manufacturing control. The built-in digital I/O interface connects to peripheral devices, such as a foot switch or a stack light.

Flexible Parameter and Tolerance Setting

Microphone production naturally has an error rate. Sorting out faulty devices at an early production stage is important to increase the overall yield, reduce waste material and optimize the quality of the manufactured goods. Important for a modern, state-of-the-art microphone test system are reproducibility, automation, speed and simplicity. The FX100 Audio Analyzer offers the microphone test solution.

Measurement Functions:
  • Frequency response in-axis, off-axis
  • Sensitivity
  • Distortion
  • Signal-to-noise ratio S/N
  • Detection of audible imperfections
  • Directivity, polar plot
  • Polarity
FX100 Microphone Test Software Project Setup

Calibration and Recording of Reference Data

The automated calibration (i.e. equalization of the reference speaker) is carried out with the NTi Audio measurement microphone M2010. Thereafter the smart “learn-mode” simplifies tolerance definition by feeding the system with a representative set of one or more “Golden Samples”. The flexible tolerance management automatically derives its tolerance Pass/Fail criteria. The system also supports up to five different quality clusters, which may be user-defined, such as “Excellent”, “OK”, “Acceptable”, “Class 3” and “Reject”. This allows the manufacturer to distinguish among quality classes.

System integration into existing production lines and the connection to host controllers is very simple. The extremely short test cycle time allows the microphone test system to easily cope with high volume production lines.

FX100 Microphone Test Software Reference Mode

Microphone Test Production Mode

The patented measurement algorithms have been optimized for factory noise immunity. This maximizes production line yield and allows the same measurement tests used in R&D to be applied to the production floor. In the production mode the measurement results are compared with the defined tolerances. The individual results of each measured parameter are summarized into a class results pass/fail. The measurement may be triggered by
  • Operator, using the keyboard
  • Serial number barcode reader
  • DIO Input (e.g. PLC trigger signal or foot switch)
The measurement results are shown on the PC-screen, indicated at the digital I/O Output (e.g. driving red/green lamps or bin-sorter) and directly logged into a Microsoft Excel report.

FX100 Microphone Test Software Passed/Failed Testing

Order Information

Flexus FX100 Audio Analyzer

Microphone Test Systems

Standard Microphone Test System
  • Flexus FX100 Audio Analyzer
  • Measurement Microphone M2010
  • RT-Microphone for Flexus Software
Microphone Test System with Directivity Measurements
  • Flexus FX100 Audio Analyzer
  • Measurement Microphone M2010
  • RT-Microphone for Flexus Software
  • RT-MicFX Directivity Option
Microphone Test System for digital MEMS Microphones
  • Flexus FX100 Audio Analyzer
  • Measurement Microphone M2010
  • RT-Microphone for Flexus Software
  • MEMS Mic Interface Box
  • Environmental Sensor
  • Precision Microphone Calibrator 94/114 dB
  • Auxiliary IO connection board
  • Stack Light (red/orange/green)
  • Footswitch
  • Rack Mount Set

Get more Information

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Reference Customers

18 Sound • 3M • AAC • ACO • AKG Acoustics • Amphenol • Atlas Copco Airpower NV • Audi AG • Audyon • Austrian Center of Competence in Mechatronics • Azden • Beyma • Blaupunkt • BMW Group • Bombadier • BYD • CableX, Slovenia • Clair Bros. • Continental Automotive GmbH • Cooper MEDC • DEKRA • Dynatech, China • e.solutions GmbH • ebm-papst • Edifier, China • Ehmann, Germany • Electrovoice (Bosch) • Eminence • EM-Tech, Korea • EuroTel, Italy • Fane • Ferrari SpA • Fischer Amps, Germany • Flextronics • Foster • Foxconn • Fuji Films • G+M Electronics, Switzerland • GE Wind Energy GmbH • Goertek • Hama GmbH & Co KG • Hamilton Video & Sound • Harman • Hi-P • Hochiki, Japan • Honeywell • Hosiden Besson Ltd • Hyundai Rotem USA Corporation • IATEC, Argentina • IMAX • Janus Donguan, China • Klipsch • KLM Group • Knowles • Lab126 • Laird • Laney, UK • Lautsprecherlabor Berlin • LOM • Maxim Semiconducters • Meyer Sound • Microsoft • Miracle, India • M-Microphone, Russia • Molex • Morel, Israel • Motorola • Multichoice, South Africa • Municipal Utilities of Düsseldorf • Munro, UK • Neutrik • Nokia • Nortel • Northrop Grumman • Osram • Panasonic • Perlos • Phoenix Contact Electronics GmbH • Plantronics • Polizei Basel-Landschaft • Porsche Engineering Services GmbH • Pulse • Rasco, Germany • Rode, Australia • Samsung • Sandia National Labs, USA • Sanken, Japan • Semco Maritime • Sennheiser • Shure Distribution GmbH • Sica • Siemens • Sikorsky Aircraft • Sipe • Skype Technologies OY (Microsoft Corp) • Sonavox • Sony • Tannoy • TCL-IMAX, China • Tokyo Acoustics • Tools4music • Vitus Audio, Denmark • Walton, Bangladesh • Western Australia Police • Wisconsin Department of Health WMHI • Yamaha Music (Asia) Private Limited • ZF Friedrichshafen AG

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Testing of

Contact NTi Audio

NTI Americas Inc.
Tigard, Oregon
Thomas E. Mintner
+1 503 684 7050

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