NTI AUDIO MINIRATOR MR2 (01) PDF Document

To avoid danger of electric shock, never connect the instrument to a power output. Non-compliance could result in damage to persons or property that is not covered by the warranty.

To avoid damage through dampness, do not use the instrument in damp environments. The instrument can be permanently damaged by the penetration of water.

Never open the instrument. The instrument can be damaged if the housing is opened, and your warranty will be invalid.

To insert batteries into the instrument, follow these steps:

1. Open the battery cover.

2. Insert three AA-LR6 batteries with the same state of charge, paying attention to the +/- marking in the battery compartment.

3. Close the battery cover once the batteries have been inserted.

Only use batteries from the same manufacturer. Replace discharged batteries with new ones and do not mix used and new batteries. The instrument can also be used with rechargeable batteries.

Yes, you can connect the instrument to a mains socket with a DC power supply unit. It is recommended to leave the batteries inside the instrument. It is recommended to use the manufacturer’s mains power adapter to avoid increased noise at the unbalanced output connector.

If using a different DC power supply unit, observe the following specifications:

1. Electrically-isolated, non-earthed linear DC power supply unit.

2. 2.1 x 5.5 x 9.5 mm plug.

3. Connection polarity: Negative (-) Center, Positive (+) Sleeve.

4. Voltage from 5 to 9 volts and a current of at least 500 mA.

ESC: Terminates an entry, jumps to the top menu level, or closes an open window.

Rotary Wheel: Slow turning allows precise setting of values. Rapid turning sets values in larger steps.

Enter: Confirms a selection.

Wave: Selects the test signal.

Freq: Sets the output frequency. Provides a direct jump to the “PARAM” menu with “SWEEP” and “CHIRP” test signals.

Mute: Switches off the output signal. Mute is indicated on the display and by a flashing mute button. The button lights up continually during pauses of “PNoise” and “Chirp” signals.

On/Off: Switches the instrument off if held down for one second. Switches the back-lighting on and off.

Sens: Changes the sensitivity steps of the frequency and level settings.

Level: Sets the output level. You can set the output signal in dBV, dBu, or V units. On the MR-PRO model, dBF (dB referred to Full Scale) and % units are available when playing back Wave files.

The instrument has two outputs wired in parallel: an unbalanced RCA output and a balanced, non-earthed XLR output.

XLR Connection: Connect the instrument to your audio device using an XLR cable. Note that the locking pin of the plug must be located on the lower side of the instrument.

RCA Connection: Connect the instrument to the input of the unit to be tested using an RCA cable.

Important: Do not use both outputs at the same time. Simultaneous use could lead to a short-circuit in one of the generator outputs in the connected instrument.

To switch the instrument on, press the “On/Off” button. The display lighting will switch on.

To switch the instrument off, press the “On/Off” button and hold it down for one second.

You can select a test signal using either the direct buttons or the rotary wheel.

Using direct buttons: Ensure that GENERATOR is selected in the menu bar. Press the “Wave” button to open the selection menu. Select the desired test signal with the rotary wheel and press “Enter”.

Using the rotary wheel: Ensure that GENERATOR is selected in the menu bar. Select “WAV” with the rotary wheel and press “Enter”. Select the desired test signal with the rotary wheel and press “Enter”.

Using direct buttons: Press the “Level” or “Freq” button to select the desired parameter. Turn the rotary wheel to set the parameter and confirm with the “Enter” button.

Using the rotary wheel: Turn the rotary wheel so the selected parameters are marked with a black bar. Confirm with the “Enter” button, causing the parameter display to blink. Turn the rotary wheel to set the parameter and confirm with the “Enter” button.

1. Select Level or Frequency with the rotary wheel.

2. Hold down the “Sens” button. The current sensitivity of the rotary wheel will be displayed.

3. Turn the rotary wheel to set up the desired sensitivity.

4. Release the “Sens” button to accept the desired sensitivity.

To adjust system settings, switch to “SYSTEM” in the menu bar using the rotary wheel and confirm with “Enter”.

Power Save: Use the rotary wheel to select the Power Save function and confirm with “Enter”. The display will blink. Turn the rotary wheel to set the desired time for the instrument to switch off if no button is pressed. Confirm with “Enter”.

Contrast: Hold down the “ESC” button and turn the rotary wheel until the desired contrast is obtained.

Backlight: In the System menu, select the Backlight function with the rotary wheel and press “Enter” to toggle between “Auto” and “Manual”.

– Auto: Backlight switches on automatically during operation and off after a period of time.

– Manual: Press the “On/Off” button to switch the backlight on and off.

Storing Configurations:

1. Use the rotary wheel to select “CONFIG” in the menu bar and confirm with “Enter”.

2. Select “STORE” and confirm with “Enter”.

3. Select a memory location with the rotary wheel and store your configuration by confirming with “Enter”.

Recalling Configurations:

1. Use the rotary wheel to select “CONFIG” in the menu bar and confirm with “Enter”.

2. Select “RECALL” and confirm with “Enter”.

3. Select the desired configuration in the Selection menu and confirm with “Enter”.

Configurations are stored in the CONFIG folder and can be renamed by connecting the instrument to a computer via USB.

The Sweep signal generates a sequence over a freely selectable frequency range. To use it:

1. Select “SWEEP” as the test signal.

2. Configure the signal parameters such as Output Level.

3. Select the “START” symbol with the rotary wheel to begin the sweep. You can interrupt a running sweep via the “STOP” symbol.

Using the “MODE” symbol, you can choose “Once-only” (plays once) or “Continuous” (repeats after an adjustable pause).

The MR-PRO supports a cable test function based on impedance measurement. To test a cable:

1. Select the “Cable test” function in the menu.

2. Plug the XLR cable into the XLR output.

3. Plug the other end into the XLR input.

The screen will display “NO XLR CABLE” if not connected properly, “OK” if the cable is correct (Pins 1:1), or error messages like “2-3 CROSSED” if the cable is defective. For long cables already in place, an optional Cable Test Plug adapter can be used at the far end.

Impedance: Using the “SINEWAVE” operating mode, the instrument measures the load connected to the output between PIN 2 and 3. The measured values are displayed by selecting “RL” with the rotary wheel.

Phantom Power: In the Generator mode, select the DC function with the rotary wheel to localize faulty voltage sources. Unequal phantom voltages on Pin 2 and Pin 3 of the XLR cable indicate an error and are displayed by a blinking phantom voltage display (DC).

Firmware updates are carried out by connecting the instrument to a computer via USB. To check the current version, select “System” in the menu bar and confirm with “Enter”.

Instructions:

1. Connect the instrument to a computer via USB.

2. Run the “MR_Up-date” software (downloaded from the manufacturer’s support page).

3. If updating for the first time, install the software. If already updated before, switch the computer online and run the software to automatically check for new firmware.

4. Follow the instructions shown in the “MR_Up-date” software.

1. Connect the instrument to the computer and create a new folder named “Screen” in the memory.

2. Remove the instrument from the computer and power it on.

3. Adjust the required settings or perform a measurement.

4. Press the “On/Off” button and the “Enter” button at the same time shortly.

The screenshot will be stored in the device memory.

The Wave File Player allows playback of test sequences (WAV files). Ideally, use 48 kHz sampling frequency, Mono/Stereo, 16 Bit resolution.

1. Select the Symbol folder with the rotary wheel and confirm with “Enter” to change the playback folder.

2. Use the rotary wheel to select the Symbol file and confirm with “Enter”.

3. Select the desired WAV file with the rotary wheel and confirm with “Enter” to play it.

To load your own files, connect the instrument to a computer via USB, open the “WAVE” sub-folder, and copy the desired files into the appropriate folders.

If the instrument reacts unexpectedly, a reset to factory settings might solve the problem. Switch the instrument off, then hold down the “ESC” button and simultaneously operate the “On/Off” button.

Refer to the following table for specific faults and corrections: