NTI Audio MR Pro Minirator

Analogue Audio Signal-Generator

  • With sine, pink and white noise
  • Delay test signal
  • Polarity test signal
  • Sweep signal for every frequency range
  • Cable test function
  • Impedance and power measurement
  • Phantom power test
  • Load independent output level
  • 512 MB Flash-Memory with USB terminal ( for storage of wave files and configurations )
  • Graphical back-lit display
  • Inputs: XLR and USB
  • Outputs: XLR and RCA
  • Operates with 3x 1.5 v AA batteries (not included)
  • Including bumper, USB cable and hand loop
  • Separately available accessories: Belt bag, power supply and cable test plug
  • Optional PSU: Art.240762

Further information

Cable Tester No
Level Meter Yes
Speaker Tester Yes
Software Yes

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4.9 / 5.0
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9 written ratings Read all reviews

MrFreekie, 04.09.2014
Love it, Use it most days when working, useful for checking equipment.
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Solid tool, highly recommended

I had to buy the device, because I had to measure the impedances of the transformers for a troubleshooting in a 100 Volt ELA.
At first I was quite skeptical because of the not so low price.

My skepticism gave way when unpacking.
The NTI Minirator MR Pro looks sturdy on its own, if the protective frame is added, you have the feeling of holding an almost indestructible device in your hand.
The controls are sensibly arranged and have clearly tactile snap and push points, which is a real advantage in poorly lit live situations.

The delivery does not include a measuring adapter. This is not really dramatic, because in the printed (!) Manual, the wiring of the sockets is well described.
Furthermore, there is also the circuit diagram of the XLR cable test adapter. The money for additional adapters can thus be saved if you know how to handle the soldering iron.

Curse batteries (3 x AA Mignon) pure and switched on.
Then test-connected a 8 ohm PA speaker with an XLR speaker cable and it could start measuring.

The operation can only be described as intuitive, but if you want to search something, the well-written manual gives information.

It is very nice that just at the moment of impedance measurement you can set different frequencies at which the measurement should be made. On the one hand, this helps to create an impedance curve, and on the other hand, it shows just how much speaker (or transformer) is scattering in impedance, especially during troubleshooting. This can quickly become a killer with stadium sound reinforcement, because it is becoming more and more fashionable to play bass-heavy music in the team line-up, and music is also often played when goals are scored. And especially at low frequencies falls in many transformers, the impedance, so that the amplifier power is exceeded quickly times ...

Speaking of performance:
In the impedance measurement mode, you can switch the measurement to power measurement. Then you can adjust the operating voltage of the speaker system in small but practical steps.
In addition to the impedance (shown on the lower edge of the display), the device then displays the power taken from the system as the main measurement. So no more calculation.

But please do not be alarmed at the impedance measurement, because you hear the set frequency during the measurement, sometimes quite loud. So output power is available. ;-)

Interesting is the possibility to load via USB own WAV files in the device memory. That is enough to save several voice announcements and test tones. You can either play it once, or in continuous loop. Also not bad for aid organizations, which often have to make voice announcements in emergency situations in a loop.
Or, you play a theatrical gong that you can then record for announcements from the console. So, the imagination is almost limitless, because the memory holds "only" 512 KB.

Various measurement parameters can be stored. So you have your favorite exhibition settings always ready.

The signal generator provides clean signals, an oscilloscope brought to light.
Delay measurements are not feasible without additional hardware, but test tones for delay measurement have already been loaded with other NTI devices.

You can also test XLR cables. Simply plug the cable into the existing test sockets and select the XLR cable test. For this one does not necessarily need the additional adapter. This is only needed if you want to check fixed lines, the ends of which you can not connect at the same time. For this you put the adapter then on the remote end of the line to be tested, and the beginning of the line in the meter itself.

Note on the edge: The device is not protected against external voltage. So always perform measurements only when the loudspeaker system is de-energized.
There is a measuring adapter for measurements that prevents external voltage from the device.
But even here you can save, if you simply basically disconnects the system from the grid before the measurement.

Only point, which moves me with the features to a star deduction:
Measured values ??are only displayed, you can not save them.
This is a shame insofar as one uses all adjustable frequencies in an impedance measurement in a row, you have to write down quite a few readings, a memory function would be a real plus!

After registering the device on the manufacturer's website, you have the option of updating the firmware or downloading further test files as * .wav.

Conclusion: Absolutely useful, practical device that should not be missing from any PA or ELA technician.
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545 €
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