Audio Generator & Impedance Meter

The Minirator MR-PRO provides a full set of analog audio signals including sine wave, pink noise, white noise, delay test signal, polarity test signal, stepped sweep and continuous sine sweep. Further, a set of wav-files, useful for system optimization, is stored in the internal flash memory. Add your own personal favorites to this set.

The signal balance, phantom power and impedance of the connected load are monitored. The integrated XLR cable tester simplifies trouble shooting tasks.

The workhorse MR2 provides all the basic standard signals at an attractive price point. Both generators are indispensable and proven tools for set-up, maintenance and monitoring of audio equipment of all types. The wide range of functionalities is tailored for measurement tasks in:

• Installed Sound
• Life Safety Systems
• Live Sound
• Broadcast
• Building Acoustics
• Industrial and Aerospace
• Quality Control

Sine

Minirator generates pure sine waveforms at user-selectable frequencies and amplitudes. The frequency steps interval can be set to as low as 0.1Hz.

• Selectable frequencies from 10 Hz to 20 kHz
• Level range from -80 to +18 dBu

---

Sweep

The start/stop frequency, step time and a step resolution as fine as 1/12th octave can be adjusted. Audio analyzers automatically trigger to this signal and record the frequency response of a device under test.

---

Chirp

The chirp signal is a logarithmic or linear gliding sine sweep signal with continuous frequency increase over time. Typical applications are recording of frequency responses, impulse response measurements and acoustic assessment of rooms.

---

Delay Test Signal

This is the designated reference signal to measure the acoustic propagation delay time from speaker to speaker in e.g. churches or auditoriums. It suits the accurate setup of delay line arrangements, thus the directionality of the signal source will be optimized. Testing is carried out in combination with the XL2 Audio and Acoustic Analyzer or Acoustilyzer AL1.

---

Pink & White Noise

Pink or white noise is synthesized with high spectral density, normal amplitude distribution and with infinite cycle duration. The Minirator also generates gated pink noise (on/off cycle 1 - 9 seconds) for convenient RT60 measurements with the XL2 Audio and Acoustic Analyzer or Acoustilyzer AL1 is included.

---

Polarity

Test signal for measuring the polarity of speakers and audio signals. The saw-tooth waveform is an ideal stimulus with only moderate stress to speakers. Testing is carried out in combination with the XL2 Audio and Acoustic Analyzer, Acoustilyzer AL1 or Minilyzer ML1.

---

User Wav-Files *.wav (MR-PRO only)

The Minirator MR-PRO offers a range of additional factory test files, e.g. for speech intelligibility verification. You may store additional user test signals as uncompressed wav-files in the MR-PRO memory. The selected file is seamlessly looped. Wav-file exchange is simplified via the USB port.

• Pre-installed: STIPA, Voice, Music
• User downloads at the support page:
• Third- and Octave Pink Noise
• Square Wave: 10 Hz - 5 kHz
• Sine: 1 Hz - 10 Hz
• Power Test acc. IEC60268-5
• NormSignal acc. EN60065
• Cinema Headroom Test

Measurement Functions in Generator Mode

Providing a detailed view of the connected load for rapid fault finding

• XLR Signal Balance
• Load Impedance
• Phantom Power Voltage

---

Cable Test

The MR-PRO verifies the correct XLR cable wiring, detecting all common XLR wiring faults with a precise description, such as “2-3 Crossed” or “Pin 2 open”. Additionally an optional Cable Test Plug may be used for single ended installations.

---

Impedance and Power Test

MR-PRO measures the impedance, phase and power rating of distributed speaker systems at selectable frequencies. The following parameters of the connected load are shown:

• Impedance and Phase
• Apparent Power and Phase

---

Store Preset Configurations

Up to 10 complete instrument configurations can be stored in the internal flash memory and reloaded for repetitive tasks. The saved settings may also be transferred to other MR-PRO instruments.

---

Compensated Output Stage

The output level corresponds over a wide range of loads to the set output voltage compensating the output impedance of the generator. Possible maximum limits when reaching the output current limit are clearly indicated.

The Minirator is available as the powerful MR-PRO Audio Generator or the basic MR2.

	MR-PRO	MR2
Generator
Output Level maximum	18 dBu	8 dBu
Flatness	+/- 0.2 dB	+/- 0.5 dB
Output Impedance	12.5 Ω	200 Ω
THD+N typical	< -96 dB	< -90 dB
Measurement Functions
Phantom Power	•	-
Impedance and Phase	•
Apparent Power and Phase (for 70V/100V distributed loudspeaker systems)	•	-
Signal Balance	•	-
XLR Cable Tester	•	-
Test Signals
Sine, Sweep and Chirp	•	•
Pink Noise, White Noise	•	•
Polarity and Delay	•	•
User Wav-Files (*.wav)	•	-
Configurations Storage	•	-
Protective Shock Jacket	•	-
Hand Strap, USB Cable	•	•