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NTi Minirator MR1

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Minirator - Portable Audio Signal Generator


Minirator MR1 is a powerful analog Audio Generator providing a comprehensive set of analog audio test signals required in professional audio environments. Convenient, reliable and well optimized - it fits into your pocket as well as your budget.

This handy Audio Generator enables you to stimulate any analog device with a broad range of appropriate signals for performance checking, maintenance and repairs. Battery powered from 2 AA cells with a lifetime > 20h.

Sine Output
A pure sinusoidal waveform is required for almost every audio measurement. The wide level range from -76dBu up to +6dBu and selectable frequencies over the full audio band allow the MR1 to replace any signal source

In the sweep mode the output signal is sequentially stepped through all available frequencies. Analyzers like the Minilyzer can automatically trigger to this signal and record the frequency response of a device under test.

The saw-tooth waveform of the polaritytest signal is an ideal stimulus with only moderate stress to speakers. Minilyzer ML1 takes advantage of this and correctly analyzes the polarity of the incoming signal.

Pink Noise
Pink Noise is the most important test signal in conjunction with a RTA analyzer as it features equal power per octave, providing a flat response curve. The MR1 Pink Noise signal has a very low crest factor.

White Noise
White Noise is the most important test signal in conjunction with FFT Analyzers as it has an equal power per Hertz between 20Hz and 20kHz. It is therefore the ideal test signal for the Acoustilyzer AL1 Zoom FFT function.

Square Wave
The square wave has many harmonics and is sometimes used for aural system testing. The MR1 has a bandwidth of 20Hz to 20kHz, a perfect 50% duty cycle and is DC offset free.

Power Save
In the configuration section MR1 offers selectable level units (dBu, dBV, Volt) and features programmable Auto-Power-Off function. The stepping speed of the sweep is also pre-programmable between 50ms and 5s per step.


  • Outputs: Balanced XLR, unbalanced RCA, phantom power resistant

  • Waveforms: Sinusoidal, Square, White Noise, Pink Noise, Polarity

  • Frequency Range:20 Hz - 20 kHz in 31 steps (Sine)20 Hz - 5 kHz in 25 steps (Square)

  • Sweep:Frequency Sweep: Level as function of frequency.Time Sweep: Measurement of level, THD+N and frequency as function of time.

  • Sweep Capabilities: 20 Hz - 20 kHz with sinusoidal signals

  • Sweep Speed: 0.05, 0.5, 1, 2, 3, 4, 5 seconds per step

  • Units: dBu, dBV, V selectable

  • Level Ranges:Waveform: Sine, Square, White Noise, Sweep:Range: -76 dBu to +6 dBuSteps: 42Inc.: 2 dBuRange: -78 dBV to +4 dBVSteps: 42Inc.: 2 dBVRange: 0.13 mV to 1.6 VSteps: 42Inc.: +/- 23 %Waveform: Pol Test:Range: -76 dBu to +4 dBuSteps: 41Inc.: 2 dBuRange: -78 dBV to +2 dBVSteps: 41Inc.: 2 dBVRange: 0.13 mV to 1.25 VSteps: 41Inc.: +/- 23 %Waveform: Pink Noise:Range: -56 dBu to -4 dBuSteps: 27Inc.: 2 dBuRange: -58 dBV to -6 dBVSteps: 27Inc.: 2 dBVRange: 4 mV to 500 mVSteps: 27Inc.: +/- 23 %

  • Flatness: +/- 0.5 dB

  • Accuracy: +/- 0.5 dB

  • THD+N:< -72 dB (0.025 %) typical @ 6 dBu< -55 dB (0.18 %) or 100 V over all max.

  • White Noise: 20 Hz - 20 kHz, Crest factor = 2.12

  • Pink Noise: 20 Hz - 20 kHz, Crest factor = 3.27

  • Output Impedance: 200 Ohm balanced & unbalanced

  • Auto Power Off: 10, 30, 60 minutes or OFF

  • Batteries:2 x AA batteries (alkaline)Typical battery lifetime > 20

  • Dimensions: 140 x 74 x 25 mm (5.5" x 2.9" x 1.00")

  • Weight: 170 g (6 oz) incl. batteries

  • Temperature: 0 to +45 C (32 to 113 F)

  • Humidity: 90 % R.H., non condensing


Q & A

Minirator MR1
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