NTI MR-PRO Users Manual
3
NTI Contact Info
NTI AG
Im alten Riet 102
9494 Schaan
Liechtenstein, Europe
Tel.: +423 - 239 6060
Fax: +423 - 239 6089
E-Mail: info@nti-audio.com
Web: www.nti-audio.com
© All rights reserved.
All information subject to change without notice
Version 1.3 / July 2007 / Software 1.10
® MiniLINK, Minilyzer, Digilyzer, Acoustilyzer, Minirator, MiniSPL
and Ministruments are registered trademarks of NTI.
Table of contents
1. Minirator Basics ..............................................................4
Introduction....................................................................4
Notes..............................................................................5
Scope of delivery............................................................. 6
Accessories .....................................................................6
2. Overview of the instrument ..........................................7
Connections....................................................................7
Buttons and operating elements......................................8
The screen display...........................................................9
Power supply ................................................................11
Characteristics of the outputs........................................12
3. Getting Started .............................................................14
Inserting the batteries ..................................................14
Fitting the protective shock jacket (MR-PRO only) ..........15
Attaching the hand strap ..............................................16
Connecting the Minirator ............................................. 17
4. Operation ......................................................................18
Switching the Minirator on and off ...............................18
Navigation in the menu bar........................................... 18
Selecting a test signal is easy.........................................19
Setting the parameters.................................................. 20
Setting the sensitivity of the rotary wheel ......................21
System settings ............................................................. 22
Congurations (MR-PRO only)....................................... 23
5. The Minirator test signals ............................................25
Sine ..............................................................................25
Table of contents
Sweep...........................................................................25
Chirp ............................................................................27
Delay Test......................................................................28
Pink Noise.....................................................................29
White Noise ..................................................................30
Polarity..........................................................................30
Wave File Player (MR-PRO only) .....................................31
6. The measurement functions of the MR-PRO ..............34
Display of impedances...................................................34
Balance display..............................................................35
Measuring phantom voltages........................................36
Testing XLR cables (MR-PRO only).................................. 37
7. Updating the instrument..............................................39
General rmware update: ............................................. 39
MR2: Updating the rmware.........................................39
MR-PRO: Updating the rmware...................................39
Calibration....................................................................40
8. Tips and trouble shooting............................................40
Resetting to the factory settings....................................40
Reloading Wave les (MR-PRO only).............................. 40
Faults and their correction............................................. 41
9. Technical data................................................................ 42
10. Further information....................................................44
Warranty conditions...................................................... 44
Declaration of Conformity............................................. 45
Information regarding disposal and recycling.................45
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5
1. Minirator Basics
Introduction
Basics
Thank you for purchasing the Minirator. The Minirator is a powerful audio generator, offering a wide range of analog test signals
for the calibration, maintenance and repair of professional audio
systems.
The rotary settings wheel combined with surrounding fast access
function keys enables instant and intuitive operation without
compromising ne adjustment capabilities.
While the MR2 has been optimized for “Value at a most attractive
price“, the MR-PRO has been developed with additional innovative functionality for even more demanding applications.
4
The MR-PRO is also equipped with the following functions:
• Integrated measurement functions for impedance, balance
and phantom power voltages
• Playback of WAV les
• Cable tester
• High output level
• True Level output stage
• Shock protection
Notes
Basics
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.
Damage through damp
Do not use the instrument in damp
environments!
The instrument can be permanently
damaged by the penetration of water.
Damage caused by opening the
instrument
Never open the instrument.
The instrument can be damaged if the
housing is opened, and your warranty will be
invalidated.
5
7
Basics
Scope of delivery
The following items are included with the respective model:
MR2: • MR2
• Operating manual
• USB cable
• Hand strap
MR-PRO: • MR-PRO
• Protective shock jacket
• Operating manual
• USB cable
• Hand strap
Accessories
Accessories available for the MR2 / MR-PRO:
• Pouch MR2 / MR-PRO NTI Art.No 600 000 302
• System case NTI Art.No 600 000 020
• EU Power Supply 7.5V NTI Art.No 600 000 301
• Cable test plug NTI Art.No 600 000 311
• Calibration certicate NTI Art.No 600 000 303
You can nd more accessories and additional information on the
Internet under www.nti-audio.com
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2. Overview of the instrument
Connections
The Minirator has the following connections:
Overview
1 2 3 4 5
1
RCA output (unbalanced)
2
XLR output (balanced)
3
DC power socket
4
XLR input for the cable test
(MR-PRO only)
5
USB connection (Mini-B, 5 pin)
7
9
wave
sens
mute
freq
esc
level
Overview
Buttons and operating elements
1 2 3
4
4
Wave Selection of the test signal.
5
Freq Setting the output frequency. Direct jump to
the “PARAM” menu with the “SWEEP” and
“CHIRP” test signals.
6
Mute Switches off the output signal.
Mute is indicated at the lower right corner of
the display.
9
8
1
ESC Terminates an entry and
7
jumps to the top menu level.
2
Rotary
wheel
Slow turning:
Precise setting of the value.
Rapid turning:
Setting the value in larger steps.
3
Enter Conrming a selection.
8
5
The button lights up continually during the
pauses of the “PNoise” and “Chirp” signal
waveforms.
7
On/Off Switches the instrument off if held down for
one second. Switches the back-lighting on
6
8
Sens Changes the sensitivity steps of the frequency
and off.
and level settings.
9
Level Setting the output level. You can set up the
output signal in the following units:
dBV, dBu,V.
With the MR-PRO, dBF (dB referred to Full
Scale) and % units are available when playing
back Wave les.
The screen display
Overview
The main menu
4
1 2
3
1
2
3
4
Menu bar
Battery symbol:
If the battery symbol lights
up the batteries are almost
completely discharged and
must be replaced.
Display of the readings
(MR-PRO)
Settings for signal generation
Settings for signal generation
1 2 3
7
6
5
1
Test signal
2
Start / Stop for certain test
signals
3
Setting up the parameters
4
Single / continuous mode for
certain test signals
5
Output frequency
6
Units for the output level
7
Output level
4
9
11
Display of the measured values (MR-PRO)
1 2 3
1
Phantom voltage
2
Balance
3
Impedance
Overview
10
Power supply
Battery operation
In order to be always able to use the Minirator exibly, we recommend the use of batteries.
Only use AA, LR6 batteries.
You will need 3 batteries for battery
operation.
During operation, the battery temperature
may increase noticeably. This is not a defect.
The Minirator can also be used with
rechargeable batteries.
Operation using the mains socket
You can also connect the Minirator to a mains socket with a
DC power supply unit. To do this, you will need the corresponding DC power supply unit, which you can order from NTI.
Overview
We recommend you use only the NTI DC
supply. But if you want to make use of a
different DC power supply unit, you must
observe the following:
Use an electrically-isolated, non-earthed
linear DC power supply unit.
Do not use a switching power supply.
Unbalanced connections in combination
with a switching power supply can lead to
noise interference and an unpleasantly high
interference level when plugging in and out.
Only use DC power supply units with a
voltage from 5 to 8 volts and a current of at
least 500 mA.
Damage caused by using an inappropriate
external DC supply is not covered by
warranty.
11
13
2
1
3
XLR
RC
A
~
~
100 Ω
MR2
U/2
U/2
U
100 Ω
0.5 Ω
Overview
Characteristics of the outputs
The Minirator has two outputs that are wired in parallel:
An unbalanced RCA output and a balanced, non-earthed XLR
output. Both outputs are resistant to externally applied phantom
power.
Wherever possible, always use balanced (XLR) connections, as
these have much better immunity to interference than unbalanced connections.
Do not use both outputs at the same
time.
The simultaneous use of both outputs could
lead to a short-circuit in one of the generator
outputs in the connected instrument.
MR2 outputs
Both the RCA and the XLR have a balanced output impedance
of 200 Ohm.
The voltage at the MR2 XLR or RCA output
is less than the set voltage U with low
impedance loads. Example:
A balanced 200 Ohm load impedance
matching the 200 ohm output impedance will
result in the expected output drop of 6 dB.
Allocation of the XLR output:
2
12
3
1
1
PIN 1
2
PIN 2
3
PIN 3
2
1
3
XLR
RC
A
~
~
I<10mA
I<10mA
6.3
Ω
6.3 Ω
MR-PRO
U/2
U/2
U
0.5 Ω
MR-PRO outputs (True Level)
Both the RCA and the XLR have a balanced output impedance of
only 12.5 ohms. The level at the XLR output corresponds to the
set source voltage U (à True Level) over a wide range of loads.
Overview
XLR short-circuit between Pin 1 and 3
Commercially available XLR to RCA adapters
short-circuit the XLR Pins 1 and 3.
Do not use such adapters with the Minirator!
The MR-PRO is designed for loads down to
600 Ohm. Depending on the output level
and the output frequency, however, the True
Level is maintained, even with smaller loads.
Behavior with low-impedance loads
The maximum output current of the MR-PRO is 10 mA. If the
connected load consumes more power, the internal regulation
of the MR-PRO reduces the output level. This condition will be
indicated on the screen by the blinking of the output level display:
13
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3. Getting Started
Getting Started
Inserting the batteries
Only use AA, LR6 batteries for the Minirator.
Only use batteries from the same
manufacturer.
Replace the discharged batteries by new
ones.
You can also use rechargeable batteries.
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.
C You have now successfully inserted the batteries.
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Fitting the protective shock jacket
1.
2.
(MR-PRO only)
With the MR-PRO, you can t the supplied protective shock jacket. This will protect the instrument against light impacts without
impairing its easy operation.
Getting Started
1. Push the lower end of your MR-PRO into the lower end of the
protective shock jacket.
2. Push the upper end of the MR-PRO into the protective housing.
C You have now tted the protective shock jacket
Damage through impacts / shocks
The protective shock jacket shields your MRPRO against reasonable impacts that could
occur in normal use.
But do not intentionally subject the
instrument to extreme stress!
Please do not drop the instrument!
Damage caused by dropping or impact is not
covered by warranty.
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