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Microphone Testing
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The NTi Audio microphone test system is a comprehensive test solution with short test cycle times. The turnkey system is based on the high-speed FX100 Audio Analyzer and the dedicated production test software "RT-Microphone". It provides a comprehensive set of measurements for the total quality control of microphone components or final assembled products, such as mobile phones, vocal microphones, headsets or MEMS microphones.
Schematic Setup:
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Analog Generator
| Test Signals |
Sinusoidal, StepSweep, GlideSweep, White Noise
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| Level Range |
10 μV to 12.45 V (–100 dBV to +21.9 dBV)
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| Level Accuracy |
±0.04 dB @ 1 kHz (balanced, output load > 2 kΩ) |
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Level Flatness
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≤ ±0.01 dB @ (–80 dBV to +21.9 dBV), (10 Hz to 20 kHz)
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Frequency Range
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5 Hz to 80 kHz |
| Residual THD+N |
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–104 dB @ 1 kHz, 0 dBV (typical) |
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≤ (–101 dB + 0.8 μV) @ BW 22 kHz |
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Analog Analyzer
Measurement
Functions |
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Frequency |
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Level (selective and wideband) |
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FFT |
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Gain
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THD |
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THD+N |
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Harmonic Distortions k2-k35 |
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Crosstalk |
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Phase |
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DC-Level |
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DC-Impedance |
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PureSound™ Rub&BuzzDetection (optional)
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| Sweeps |
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StepSweep: Frequency Sweep, Time Sweep, Level Sweep, Table Sweep |
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GlideSweep: Frequency Sweep |
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| GlideSweep Speed |
Down to 100 ms for frequency response (20 Hz to 20 kHz)
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| Level Range |
< 1.0 μV to 141 V (max 200 Vp), channel independent auto ranging |
| Level Accuracy |
±0.04 dB @ 1 kHz |
| Level Flatness |
< ±0.015 dB (20 Hz to 20 kHz) |
| Frequency Range |
DC, 5 Hz to 80 kHz |
| Residual THD+N |
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≤ (–104 dB + 0.5 μV) @ 22 kHz BW |
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–108 dB @ 1 kHz, 0 dBV (typical) |
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| Residual Noise |
≤ 1.7 μV (20 Hz to 20 kHz bandwidth) |
| Filters |
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A-weighting, C-message
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Lowpass: 3.4 kHz, 8 kHz, 15 kHz, 20 kHz Brickwall (AES 17), 22.4 kHz, 40 kHz
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Highpass: 10 Hz, 22.4 Hz, 100 Hz, 300 Hz, 400 Hz |
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| Residual XTalk |
≤ (–125 dB + 1 μV) @ 10 Hz to 20 kHz |
| Input Bias Supply |
2 VDC or 48 VDC Phantom Power, ICP®
DCR measurement current 100 μA or 1.6 mA |
| Input Coupling |
DC or AC (< 3 Hz) |
General
| Channels |
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2 or 4 Parallel Independent Inputs/Outputs Analog |
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XLR and BNC connectors, Binding post
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| Extension Slots |
3 empty slots @ Base Unit FX100 for modular extensions |
| Interfaces |
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USB 2.0 Communication to PC |
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Headphone connector for audio out, 1/4”Jack Stereo |
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LAN (prepared for later firmware extension) |
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| Pass/Fail Result |
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Built in DIO-Interface controls external peripherals |
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Dual color display with green/red indication |
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| FX-Control Suite |
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PC Software with full access to all audio analyzer features |
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Parallel measurements with internal/external triggering |
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Calculation panels for mathematical processing of measurement data |
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Result reporting: txt-files, csv-files or xlsx-files |
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Full tolerance handling and hardware wiring diagram |
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| Programming |
Supports .NET Assembly (e.g. C#.NET, Visual Basic.NET) |
| Design |
Desktop use or ½ size 19’’ rack mounting |
| Mains Power |
100 - 230VAC / 50 - 60 Hz |
| Calibration interval |
1 year recommended |
| Dimensions |
W x H x D: 215 x 132 x 429 mm (8.5" x 5.25" x 16.9"), 3 rack units high |
| Weight |
Base unit 5.12 kg, 11.3 lbs |
| Operating Temperature |
+5°C to +45 °C (+41°F to +113°F) |
| Relative Humidity |
< 90 % non condensing |
All information is subject to change without notice.
FLEXUS, FX100, FX-Control and PureSound are trademarks of NTi Audio.
ICP® is a registered trademark of PCB Piezotronics.
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