Minilyzer ML1
User Manual
NTI CONTACT
Headquarter:
NTI AG
Im alten Riet 102
9494 Schaan
Liechtenstein, Europe
Tel
+423 - 239 6060
Fax
+423 - 239 6089
E-mail info@nt-instruments.com
Home www.nt-instruments.com
© NTI AG
All rights reserved.
Subject to change without notice.
Release 3.11 / Jan 2005 / Software V3.11
Minilyzer, Minirator, MiniSPL and Minstruments are registered
trademarks of NTI AG.
TABLE OF CONTENTS
1. INTRODUCTION ...............................................................1-01
1.1
1.2
1.3
1.4
1.5
CE Declaration of Conformity........................................... 1-01
International Warranty and Repair ................................... 1-02
Warnings .......................................................................... 1-03
Overview .......................................................................... 1-04
Battery Replacement........................................................ 1-05
2. BASIC OPERATION..........................................................2-01
2.1
2.2
2.3
2.4
2.5
2.6
2.7
Power ON/OFF - Backlight............................................... 2-02
Escape ............................................................................. 2-02
Enter / Cursor Control ...................................................... 2-03
Display Mode ................................................................... 2-03
Menu Bar.......................................................................... 2-04
Inputs and Monitor Output................................................ 2-08
Music Detection................................................................ 2-08
3. MEASUREMENT FUNCTIONS ..............................................3-01
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
Level RMS........................................................................ 3-01
Level Relative................................................................... 3-02
Level SPL ......................................................................... 3-03
THD+N ............................................................................. 3-10
vu+PPM............................................................................ 3-11
Polarity ............................................................................. 3-13
Signal Balance Error ........................................................ 3-15
Sweep .............................................................................. 3-16
1/3rd Octave RMS ............................................................. 3-20
1/3rd Octave SPL .............................................................. 3-21
Scope ............................................................................... 3-23
4. INDUCTION LOOP MODE ....................................................4-01
5. TROUBLESHOOTING .........................................................5-01
5.1
5.2
System Break Down......................................................... 5-01
Low Level Measurements ................................................ 5-01
6. ACCESSORIES ................................................................6-01
6.1
6.2
6.3
6.4
6.5
MiniSPL ............................................................................ 6-01
MiniLINK........................................................................... 6-01
ML1 Adapter -20dB .......................................................... 6-02
Pouch ............................................................................... 6-02
Minstruments System Case ............................................. 6-02
7. TECHNICAL SPECIFICATION ...............................................7-01
7.1
7.2
Technical Data General Functions ................................... 7-01
Technical Data Acoustic Functions................................... 7-03
Introduction
1.
INTRODUCTION
Congratulations and thank you for buying NTI’s Minilyzer ML1, a
product specially suited for professional audio applications. The
Minilyzer offers advanced analysis functions, expected only in much
larger and more expensive systems. We are convinced you will enjoy
using it!
NTI products are manufactured in compliance with the highest quality
standards and marked with the CE sign.
In order to avoid any damage to the unit, we strongly recommend to
read the entire manual before you start using the instrument.
1.1
CE Declaration of Conformity
We, the manufacturer
NTI AG
Im alten Riet 102
9494 Schaan
Liechtenstein, Europe
hereby declare that the product Minilyzer ML1, released in 2000,
conforms to the following standards or other normative documents.
EMC-Directives:
Harmonized Standards:
89/336, 92/31, 93/68
EN 61326-1
This declaration becomes void in case of any changes on the product
without written authorization by NTI.
Date:
01.04.2000
Signature:
Position of Signatory:
Technical Director
1-01
Introduction
1.2
International Warranty and Repair
International Warranty
NTI guarantees the Minilyzer and its components against defects in
material or workmanship for a period of one year from the date of
original purchase, and agrees to repair or to replace at its discretion
any defective unit at no cost for either parts or labor during this
period.
Restrictions
This warranty does not cover damages caused through accidents,
misuse, lack of care, the attachment or installation of any components
that were not provided with the product, loss of parts, connecting the
instrument to a power supply, input signal voltage or connector type
other than specified, or wrongly polarized batteries. In particular,
no responsibility is granted for special, incidental or consequential
damages.
This warranty becomes void if servicing or repairs of the product are
performed by any party other than an authorized NTI service center
or if the instrument has been opened in a manner other than specified
in this manual.
No other warranty, written or verbal, is authorized by NTI. Except as
otherwise stated in this warranty, NTI makes no representation or
warranty of any kind, expressed or implied in law or in fact, including,
without limitation, merchandising or fitting for any particular purpose
and assumes no liability, either in tort, strict liability, contract or
warranty for products.
Repair of your Minilyzer ML1
In case of malfunction, take - or ship prepaid - your NTI Minilyzer
packed in the original box, to the authorized NTI representative in
your country. For contact-details please see the NTI web page:
www.nt-instruments.com
Be sure to include a copy of your sales invoice as prove of purchase
date. Transit damages are not covered by this warranty.
1-02
Introduction
1.3
Warnings
In order to avoid any problems during the operation of the instrument,
follow the rules listed below:
• Read this manual thoroughly before you operate the
instrument for the first time.
• Use the instrument for the intended purpose only.
• Never connect the instrument to a high voltage output such
as a power amplifier, mains power plug, etc.
• Do not disassemble the instrument.
• Never use the instrument in a damp environment.
• Remove the batteries as soon as they are flat or if the
instrument is not intended to be used for a longer period
of time.
1-03
Introduction
1.4
Overview
The Minilyzer ML1 is a sophisticated audio test instrument, supporting
a wide range of useful measurement functions. The results are
displayed on a large LCD with backlight:
• Level RMS, Relative or SPL (Sound Pressure Level)
• THD+N (Total Harmonic Distortion + Noise)
• vu-Indicator and PPM (Peak Program Meter)
• Frequency
• Polarity Test (in combination with NTI’s Minirator MR1)
• Signal Balance Error
• Sweep recording with respect to frequency or time
• 1/3rd Octave Spectrum RMS or SPL
• Scope
Additionally, several input filters are available, depending on the active
measurement function:
• A-weighting acc. IEC 61672
• C-message acc. CCIR 468-4
• 22 Hz Highpass acc. DIN 45045, -120 dB / dec.
• 60 Hz Highpass acc. DIN 45045, -120 dB / dec.
• 400 Hz Highpass acc. DIN 45045, -120 dB / dec.
• Voice Bandpass acc. ITU-T P.48
• C-weigting acc. IEC 61672
• X-Curve-1 acc. ISO 2969
The X-Curve-1 filter is especially applicable for the recording,
monitoring and play-back of wide range soundtracks in indoor
theatres, review rooms or cinemas. To measure the acoustic
response in such rooms e.g. the Minirator MR1 shall be used with
the pink noise signal selected. Via the Minilyzer the 1/3rd octave
spectrum has to be recorded using the X-Curve-1 filter. According
the ISO-norm the result shall be a flat graph (a continuous noise
spectrum having constant energy per 1/3rd octave bandwidth).
A setup screen allows to adjust four settings according to the specific
demands of the user:
• Auto power off duration
• Auto backlight off duration
• LCD contrast
• Multiple setup (individual settings for up to 4 users)
1-04
Introduction
1.5
Battery Replacement
After unpacking, insert three (3) pcs. 1.5 V alkaline batteries, type AA,
LR6, AM3 into the ML1 battery compartment as shown in Fig 1 and Fig
2. The typical life-time for a set of alkaline batteries is 16 hours.
Fig 1.1 Open Battery Compartment
NOTES
Fig 1.2 Inserted Batteries
• We do not recommend to use rechargeable NiCd- or
NiMH-batteries.
• Do not insert batteries of different types.
• Note the correct polarities of the inserted
batteries.
• Remove the batteries as soon as they are flat and
change all batteries at the same time.
1-05
Basic Operation
2.
BASIC OPERATION
Despite the wide range of available measurement functions and
optional setups, the operation of the Minilyzer is almost selfexplanatory.
Fig 2.1 Display & Control Elements
The LCD is divided in the menu bar on top (measurement function,
filter, setup and running / low battery) and the results displayed below
are showing various information’s about the current status.
The cursor control keys and the escape button allow straightforward
navigation through the available features to quickly get the required
information’s like
• Actual setup (measurement function, filters)
• Status of the unit / batteries
• Measurement results (numerical values and bargraph).
2-01
Basic Operation
2.1
Power ON/OFF - Backlight
The yellow, oval-shaped key on the right hand side has the following
functions:
• Device on, press and hold it for at least one second to turn the
unit on.
• Backlight, press it shortly to activate the backlight.
• Device off, press and hold it for at least two second to turn the
unit off.
The Minilyzer will start up in the same mode (e.g. measurement
function) and with the same settings as it was switched off the last
time. In case the setup screen has been selected at switching off the
unit, the previous measurement function will be entered.
The backlight may be activated at any time, without affecting the
settings of the unit.
Please note that the ML1 has independent auto power off functions
for main power and the backlight. These may be adjusted separately
(see 2.5.c Setup).
2.2
Escape
The yellow key on the left-hand side labeled ESC, activates the
escape (exit) function and may be selected at any time. Depending
on the instrument status, pressing the ESC-key performs the following
functions:
• No menu is open, the cursor returns to its default position (top
left field).
• A selection menu is open, the menu gets closed, resetting the
unit to the status in which it was opened.
• In the SETUP mode, the executed changes are saved and the
previous measurement mode is recalled.
In other terms, by pressing the ESC-key maximum twice, the unit
is reset to the last active status and the cursor returns to its default
position.
2-02
Basic Operation
2.3
Enter / Cursor Control
The cursor is the core control element of ML1, providing access to
its menus and to the current instrument settings. The cursor position
is represented by an inverted display (white on black) of the field
holding the cursor.
The cursor may be moved from menu to menu by using the four gray
arrow keys ï, ð, ñ and ò. The enter key (↵) has to be pressed to
enter a submenu or to confirm the current selection.
To modify the menu status execute the following procedure:
• Move the cursor to the field of interest and press the enter key.
• Scroll to the required menu option by using the arrow keys.
• Confirm your selection by pressing the enter key.
Please note that in certain selection modes, the measurement result
will be updated with the new selection even before the enter key has
been pressed for confirmation.
For instance, if a new level unit is selected - but not yet confirmed - the
display will instantly update to the newly selected unit even before the
enter key has been pressed for confirmation.
In case of an unwanted change of any menu, the old status may be
re-established by pressing the ESC-key.
2.4
Display Mode
Giving a better readability the display mode determines the rapidity of
following up input signal changes. The available modes are:
• SLOW
3 sec. averaging
• NRM
1 sec. averaging
• FAST
no averaging
If averaging is active, measurements are smoothed in an exponential
way (exponential time constant) before being displayed.
2-03
Basic Operation
2.5
Menu Bar
The menu bar, located at the top of the LCD, allows the user to select
the measurement function, to activate a filter or to enter the setup
screen. The field on the right hand side displays the battery voltage
status of the unit.
To make any selection move the cursor to one of the menu bar fields
and press the enter key.
a.
Selection of Measurement Function
Fig 2.2
Example of Function Submenu
The entries of the pull down menu (Fig 4) are the following:
• LEVEL RMS
• LEVEL REL - the RMS input level relative to a user-defined
reference level
• LEVEL SPL - sound pressure level
• THD+N - total harmonic distortion and noise
• vu + PPM - volume indicator and peak program meter, selectable
standards are Type I, Type IIA, Nordic
• POLARITY - analysis function corresponding to the Minirator MR1
polarity test signal, acquired either by direct cable connection or
through the built-in microphone of ML1
• BALANCE - the signal balance error quantitatives the level
deviation between pin 2 and pin 3 of the XLR input connector
• SWEEP - sweep recording with respect to frequency or time
• 1/3rd OCT. RMS - one third octave spectrum of line input signal
• 1/3rd OCT. SPL - one third octave spectrum of microphone input
signal, sound pressure level
• SCOPE - the time graph of the input signal
2-04
Basic Operation
b.
Selection of Filters
Fig 2.3 Example of Filter Submenu
There are two sets of filters with the following characteristics
available:
Set 1:
FLAT
A-WTD
C-MESS
HP22
HP60
HP400
VOICE
Flat frequency response (no filtering)
A-weighting filter acc. IEC 60651
C-Message filter acc. CCIR Rec. 468-4
Highpass 22 Hz acc. DIN 45045, -120 dB/dec.
Highpass 60 Hz acc. DIN 45045, -120 dB/dec.
Highpass 400 Hz acc. DIN 45045, -120 dB/dec.
Voice band filter acc. ITU-T P.48
Set 1 filters are applicable with the measurement functions LEVEL
RMS, LEVEL REL, THD+N and SWEEP.
Set 2:
FLAT
A-WTD
C-WTD
X-CRV-1
Flat frequency response (no filtering)
A-weighting filter acc. IEC 60651
C-weighting filter acc. IEC 60651
inverted X-Curve filter acc. ISO 2969
Set 2 filters are applicable with the measurement functions LEVELSPL and 1/3rd OCT., whereby the X-CRV-1 filter is enabled in the
1/3rd OCT. mode only.
Any selected filter will stay active until it is disabled by the user.
However, if the filter is not supported by the measurement function,
it will be disabled automatically.
2-05
Basic Operation
c.
Setup
The setup screen allows to customize basic settings of the Minilyzer
ML1 by the following procedure:
• Move the cursor to the corresponding field and press enter
• Select the required status by using the arrow keys
• Press the enter key to confirm
Fig 2.4 Setup Screen
AUTO POWER OFF defines the time after the ML1 is switched OFF
automatically after the last key-press. The available settings are
3 MIN, 10 MIN, 30 MIN, 60 MIN and DISABLE. In case DISABLE
is selected, the user has to turn the unit off manually or it will run
until the batteries are discharged.
AUTO LIGHT OFF defines how long the backlight stays on after being
activated. Possible selections are 3 SEC, 10 SEC., 60 SEC. and
DISABLE. In the latter case, the backlight will stay on, until the unit
is switched off. The longer the backlight is turned on, the shorter is
the lifetime of the batteries.
LCD CONTRAST adjusts the contrast of the display. Alternatively,
press the ESC and up/down arrow key simultaneously in any
measurement panel.
MULTIPLE SETUP allows four users to store their individual settings.
To enable the multiple setup mode, set the corresponding entry to
ENABLE and confirm. At the next the Minilyzer is switched on, the
user will have to select the individual setup-ID (1, 2, 3 or 4) in the
startup screen (Fig 7). All parameter settings in all measurement
modes are now stored under this ID at switch off.
IND. LOOP MODE allows to activate the AFIL measurement mode to
measure & verify hearing aid installations.
2-06
Basic Operation
Fig 2.5 Multiple User Startup Screen
NOTE
d.
Only the last recorded sweep curves will be stored
independent on the selected user setup.
Low Battery Indicator
The "MEM" field is displayed in the right hand field of the ML1 menu
bar.
Alternatively, if the inserted batteries
are almost exhausted, this field
will show a battery-low indicator
(Fig 2.6).
NOTE
As soon as the batteries
are discharged, they
must be removed from
the ML1, in order to
avoid damage due to
leakage.
Fig 2.6 Low Battery Indicator
2-07
Basic Operation
2.6
Inputs and Monitor Output
On top of the ML1, three connectors as well as the internal microphone
are located (Fig 2.7):
• The XLR and RCA inputs allow to feed a signal to the ML1.
• A 3.5 mm (1/8“) jack monitor output allows the connection of a
headphone. Thus, the user may hear the input signal.
• The internal microphone provides the possibility to test the polarity
of an acoustical signal if the NTI’s Minirator MR1 polarity check
signal is played back. This especially serves to check the polarity
of loudspeakers.
Fig 2.7 Inputs and Outputs of ML1
NOTE
2.7
Never connect the XLR- and the RCA input at the same
time!
Music Detection
Automatic gain control is applied to the input signal before being
analyzed and made audible from the monitor jack. In this mode, the
monitor signal behaves similar like a compressor output, whereby the
user hears an almost constant sound pressure level. For input levels
lower -20 dBu the gain is set to +20 dB.
NOTE
The automatic music detection is only available in
the measurement functions LEVEL RMS, LEVEL REL,
THD+N, POLARITY, BALANCE, SWEEP and SCOPE.
2-08
Measurement Functions
3.
MEASUREMENT FUNCTIONS
3.1
Level RMS
LEVEL RMS reflects the absolute level of the line input signal.
Measurement
Function
Active
Filter
Frequency
Signal
Balance
Bargraph
Zoom
Mode
Level RMS
Result and
Unit
Bargraph
Zoom
Control
Display
Filter
Bargraph with Scaling Information
Fig 3.1 Level RMS Meter Panel
To enter the LEVEL RMS mode, select LEVEL -> RMS in the
measurement functions submenu.
Signal Balance: This indicates the deviation from level-match of the
incoming balanced signal between pin 2 and pin 3 in percent (%).
The position of the arrow indicates the following:
• Arrow in center, the input signal is balanced.
• Arrow out of center, linear indication of a balancing problem, e.g.
arrow moves left nearer to the number 2 shows the signal level
on pin 2 is higher than on pin 3.
• Left or right end, the signal balance error is 33% or higher. 33%
equals a difference in the signal level of 6 dB.
• UNBAL, the signal balance symbol changes to UNBAL at the
signal balance error exceeding 90%.
Result and Unit: Level RMS. The units dBu, dBV, V are selectable.
Bargraph: The bargraph provides an analog display of the RMS level.
The scaling may be controlled automatically or manually.
• Select manual (M) or automatic (A) scaling by the bargraph zoom
mode field.
• Within the manual scaling (M) select the bargraph zoom control,
press enter and the left/right keys to scroll through the
3-01
Measurement Functions
actual range or the up/down keys to increase or decrease the
range (sensitivity) of the bargraph scale.
• Press enter to confirm your setting.
Display Filter: see 2.4. Display Mode
NOTES • For balanced input levels higher than +20 dBu, the
ML1 Adapter -20dB may be applied. (for details see
Accessories).
• The LEVEL RMS function is also available in the
SWEEP mode (see 3.8) and in 1/3rd OCT. RMS mode
(see 3.9).
3.2
Level Relativ
This function measures the input RMS level, relative to a user-defined
reference level (Fig 3.2).
Reference Level
The reference level has to be
defined in the following way:
• Select the LEVEL REL
mode
• Apply the intended
reference level to a
ML1 input connector.
• Move the cursor to the
REF field below the main
result line and press the
enter key
Fig 3.2 Level Relative Meter Panel
This stores the applied level as the current reference level for all further
level relative measurements until a new reference level is set. The
level relative is indicated in dBr (dB relative) or %.
The level relative function may be used to measure the signal-to-noise
ratio (S/N) of a device under test (DUT) in the following manner:
• Set the unit of the level relative measurement to dBr.
• Connect the DUT output to the ML1 and mute the DUT output.
• Adjust the reference level to this signal as described above. By
this, the ‘noise’ signal of the DUT is acquired.
• Enable the DUT, thus applying the signal to the ML1. The resulting
level relative value reflects the S/N ratio in dB.
3-02
Measurement Functions
3.3
Sound Pressure Level
In the LEVEL SPL mode the Minilyzer measures the integratedaveraging level over time, the actual, minimum and maximum sound
pressure level.
NOTES
• For this function a self powered microphone is
required. NTI does recommend to use the accessory
MiniSPL (for details see Accessories).
• Prior the first measurement the Minilyzer has to
be calibrated to the microphone specifications.
As default the ML1 is calibrated according the
MiniSPL.
• No phantom power is available on the XLR-input.
a. Sound Pressure Level Panel
Pause
Clock
Equivalent
Continious
Sound
Pressure
Level
Calibration
Minimum,
Maximum or
Actual SPL
Time
Weighting
SPL Bargraph with manual ranging
Fig 3.3 Sound Pressure Level Panel
To enter the LEVEL SPL mode (Fig 3.3), select LEVEL -> SPL in the
measurement functions submenu.
For most of the ML1 applications, the sound pressure level
measurements require the use of the A-weighting filter. To prevent
wrong filter settings, causing wrong non-usable test results, the default
filter setting of the “LEVEL->SPL” mode is A-weighting (A-WTD).
Note:
Each time the LEVEL SPL mode is selected the
A-weighting filter is pre-set by default.
3-03
Measurement Functions
Start of measurement: The sound pressure level measurement is
re-started every time
• The LEVEL SPL screen is entered
• The filter selection is changed.
• The clock is reset.
• The time weighting selection is changed.
• The bargraph range selection (RNGE) is changed.
Sound Pressure Level: The equivalent continuous sound pressure
level (also time-averaged sound level) is indicated in dBLeq, dBLAeq,
dBLCeq, depending on the selected filter in the filter menu.
Example:
• select in the main menu the filter A-WTD
• the measurement unit is changing to dBLAeq and the minimum,
maximum and actual sound pressure level readings below are
A-weighted.
Below the time-averaged SPL reading one of the following values
may be displayed (select with the cursor keys):
• ACT: actual sound pressure level (SPL)
• MIN: minimum sound pressure level acquired during the
measuring time indicated by the clock. The minimum value is
stored until a new lower reading has been taken.
• MAX: maximum sound pressure level acquired during the
measuring time indicated by the clock. The maximum value is
stored until a new higher reading has been taken.
Pause: The Leq and min./max. measurement may be freezed for a
user defined time.
• Select the pause symbol and press the enter key.
• The pause symbol is flashing.
• The actual SPL reading is continuously displayed and not
freezed.
• Select the pause symbol and press the enter key to continue the
measurement, visible by the continuing counting clock.
Clock: Duration in hours:minutes:seconds of the actual measurement;
select the clock and press the enter key to reset the time and restart
the measurement.
3-04
Measurement Functions
Time weighting: All sound pressure level measurements include
time weighting. A change in sound pressure level is read out on
the display with a shorter or longer response time.
Available response times, corresponding to IEC 60651, are
• SLOW (long attack- and release time)
• FAST (short attack- and release time)
• IMP (=impulse, very short attack and long release time)
Bargraph: The bargraph provides an analog display of the actual
sound pressure level.
Available bargraph ranges are:
• 20 - 100 dBSPL
• 40 - 120 dBSPL
• 60 - 140 dBSPL
The selected bargraph range complies to the measurement range
of the instrument. To achieve accuracy of the measurement within
the specified tolerances the proper range must be selected, called
primary indicator range. The two range indicator arrows assist to
set the Minilyzer to the optimal range. As soon as the indicated
bargraph value is found lower than the primary indicator range, the
down arrow symbol below RNGE will start to move, symbolizing the
actual bargraph reading is inaccurate. The lower bargraph range
needs to be changed manually by selecting the moving left arrow
symbol and pressing the enter key.
Fig 3.4 SPL Panel with Overload
3-05
Measurement Functions
By exceeding the primary indicator range four overload arrows
replacing the dBLeq reading and no reading below is shown (see
Fig. 13). Select the right arrow below RNGE and press enter to
change to the next higher bargraph range. In case signal clipping
has occurred the term OVL is flashing above the RNGE field as long
as this peak, is significant influencing the integrating sound pressure
level reading. For example an SPL peak for 0.1 sec. will have effects
to the Leq reading for several seconds but it’s contribution can be
neglected after ten minutes.
b. SPL/LEQ Logging
The Minilyzer together with the optional MiniLINK USB PC interface
enables the data logging of all test results.
Note:
The logging function is a free add-on to the
MiniLINK, available after the registration of your test
instrument
The Minilyzer can record the SPL/LEQ curve flow, e.g. during an
event, for many hours. The results can then be loaded to a PC and
visualized as a level diagram using e.g. Microsoft Excel.
The stored results remain within the Minilyzer memory even in the
event of a battery failure during the recording session.
Start SPL/LEQ logging
After the ML1 is successfully
registered, you will find
the additional "LOG AS ...“
function in the LEVEL SPL
memory menu. This feature
enables you to record the
following test results:
• Actual SPL and LEQ
value
Fig 3.5 SPL Logging Start
• LEQ Overload
• At each recording interval:
SPL averaged, minimum
and maximum
3-06
Measurement Functions
Setting of recording time
The maximum recording time
(END) of the sound pressure
level logging depends on the
remaining memory and the
selected test interval period
(T). The logger may record a
maximum of 1500 points over
a custom defined time.
Fig 3.6 SPL Logging Setting
The test interval period (T) can
be defined by the user in the
format hh:mm:ss.
Review logging records
When checking the recorded
data in the memory overview,
the “SPL/LEQ LOG DATA“
screen is displayed. The
result table is stored together
with this screenshot and can
be read out by using the
MiniLINK PC software.
Fig 3.7 SPL/LEQ Memory
Note:
During the ML1 SPL/LEQ logging the change of
settings is not possible.
3-07
Measurement Functions
c. Calibration Panel
The Minilyzer ML1 enables the calibration of microphones, such as
the MiniSPL.
Fig 3.8 Calibration Panel
Select CALIB. in the LEVEL SPL panel field. Press the enter key and
the calibration screen SET SENSITIVITY ... will be displayed (Fig 14).
The following three calibration modes are available:
TO DEFAULT MINISPL-MIC: All MiniSPL are factory calibrated to a
sensitivity of 20.0 mV/Pa. Reset to default setting:
• Select the GO! field on the left.
• Press the enter key to start.
• OK! is shown to confirm the completed calibration.
USING EXT. REF.: The sensitivity may be adjusted with an external
calibrator to produce a certain calibrated sound pressure level.
• Select the dBSPL-value, press the enter key and adjust with the
cursor keys the sound pressure level generated by the calibrator.
Use up/down keys for 1.0 dBSPL steps and left/right keys for 0.1
dBSPL steps. The setting range 80 - 140 dBSPL is supported.
• Confirm the setting with the enter key.
• Produce the specific reference signal with the calibrator to the
microphone attached.
• Press the left cursor key to select the GO! field and press enter to
execute the calibration, whilst the reference signal of the calibrator
is still present.
• The frame WORKING ... followed by the frame CALIBRATION
FINISHED! is shown centered on the calibration screen if all
has been found in good order (see Fig 15). Otherwise various
3-08
Measurement Functions
error indications may be displayed to inform the user about the
detailed
• The new sensitivity is calculated by the Minilyzer and shown
below USING EXT. REF.: in mV/Pa.
• Press the ESC button to exit the calibration mode and return to
the LEVEL SPL screen.
• Check the calibration by applying the reference signal again to the
attached microphone. The sound pressure level of the calibrator
shall be shown to confirm the calibration is carried out in good
order.
Error indications will appear during the calibration caused by
low/high input level or the calculated sensitivity is out of the range
2 - 80 mV/Pa.
Fig 3.9 Calibration Finished
MANUALLY:
• Select the setting value xx.x mV/Pa.
• Press enter and select with the cursor keys the sensitivity
according to the attached microphone, use up/down keys for
1.0 mV/Pa steps and left/right keys for 0.1 mV/Pa steps. The
setting range 2 - 80 mV/Pa is supported.
Simply press the ESC button to exit from the calibration screen
back to the LEVEL SPL screen. The new measurement is started
immediately.
3-09
Measurement Functions
3.4
THD+N
In this mode the Minilyzer measures the THD+N (Total Harmonic
Distortion + Noise) and the k2 - k5 harmonic distortion.
Input Level
(RMS)
Fig 3.10 THD+N Meter Panel
The measurement is carried out in the band from 10 Hz - 20 kHz,
expressed in dB or in %. Simultaneously, the LCD shows the actual
RMS input level or the 2nd, 3rd, 4th & 5th harmonics distortion below
the THD+N result.
NOTE
The THD+N results are calculated using a restricted
measuring bandwidth of 10 Hz - 20 kHz.
Besides checking the linear purity of a sine signal - e.g. measuring
amount of harmonic distortions - this measurement mode is
particularly suited to get a quick idea whether unwanted disturbances
like hum are present.
3-10
Measurement Functions
3.5
vu + PPM
ML1 provides vu + PPM (Peak Program Meter) measurement results,
following IEC60268.
Numerical
Peak-Hold
Reference
Level
Graphical
Peak-Hold
Integration Time Reference Indicator
Fig 3.11 vu + PPM (Type I) Panel
The PPM may be measured according to three standards:
•
Type I
•
Type IIA
•
Nordic standard
One of these standards has to be selected when entering the vu+PPM
mode through the measurement functions menu.
The following chapters describe the different entry fields and indicators
of the vu+PPM display.
a.
Reference Level & Indicator
The reference level indicates the RMS level of a 1 kHz sine wave that
defines the value of the reference indicator. The reference level may
be defined by the user in a range of -20 dBu to +14 dBu.
The default reference level depends on the selected standard
•
+4 dBu for the vu-meter
•
+6 dBu for the PPM standards Type I and Nordic
•
+8 dBu for the PPM standard Type IIA.
3-11
Measurement Functions
The following examples explain the correlation between the reference
level and the reference indicator.
Example 1
Given vu-meter reference level set to +4 dBu
Input signal = steady-state sine wave of +4 dBu
Result
vu meter level = 0 (reference indicator level)
Example 2
Given vu-meter reference level set to 0 dBu
Input signal = steady-state sine wave of +4 dBu
Result
vu-meter level = +4 (+4 dB above reference indicator)
Example 3
Given PPM Nordic standard, reference level set to +12 dBu
Input signal = steady-state sine wave of +6 dBu
Result
b.
PPM level = TST (-6 dBu below reference indicator level)
Peak Hold
There are two different types of peak hold on the vu+PPM screen:
• Two numerical peak hold indications, located above the right
hand end of the vu and the PPM bargraph.
The numerical peak hold indicates the all-time max. input level
since the vu+PPM mode has been entered. It may be reset by
placing the cursor to it and pressing the return key.
To reset the two numerical peak-hold simultaneously, simply
re-enter the vu+PPM mode.
• Two graphical peak hold indications, represented by a vertical line
in each bargraph. The graphical peak hold display has a decay
time of approximately one second.
c.
Integration Time
The PPM display provides an additional entry field to select the attack
and release times between NRM (normal) and FAST.
• In the NRM mode, the value of the integration time is given by the
corresponding standard (Type I: 5 ms; Type IIA: 10 ms; Nordic:
5 ms)
• In the FAST mode, the integration time is 1 ms for all
standards.
3-12
Measurement Functions
3.6
Polarity
The polarity test function detects the correct cable and speaker polarity
in combination with the Minirator MR1. The Minilyzer provides the
following test configurations:
a. Speaker polarity test
Feed the speaker system with
the polarity-test signal of the
Minirator and adjust the level
(at MR1 or amplifier) that the
test signal is good to hear.
Minilyzer settings:
Fig 3.12 Speaker Polarity Panel
• IN:MIC (INT), using the
internal mic of the Minilyzer
ML1
• IN:XLR/RCA, using an
external mic, such as the
MiniSPL
Choose the polarity test
frequency range:
Fig 3.13 Woofer Polarity Panel
Note:
• FULL/MID, for tests with
wide band speakers
• WOOFER, for tests with
woofers
Please note the polarity testing is a simplified
measurement of a very complex signal phasing.
Drivers, speakers and cross-overs cause severe
phase shifts of the audio signal.
The polarity of various speakers within the same
cabinet can be different. This is not a problem nor
caused by bad speaker design.
Polarity testing is useful for checking the correct wiring
of similar speaker systems.
3-13
Measurement Functions
An overrange indicator appears for levels exceeding the instruments
operating range. In this case increase the distance between
microphone and loudspeaker or reduce the volume.
b. Cable polarity test
Use the polarity test signal of the Minirator to feed the cable under
test. The Minilyzer analyzes the signal polarity at the other end of
the cable.
Minilyzer settings:
• IN: XLR/RCA,
• Mode: Cable
Fig 3.14 Cable Polarity Panel
The following problems may be detected quickly and easily in this
way:
• Wrong polarity, caused by wrong or defective wiring inside the
cable
• Cable problems
unsymmetrical signals, displayed with the balance indicator, can
lead to the accurate detection of various cable problems, such
as
• “–UBAL–“ leads to a broken internal wire at a symmetrical XLR
cable
• The balance indicator out of center leads to other cable
problems as explained in detail in the NTI application note
“Signal Balance“ (available for download at the NTI website
www.nt-instruments.com/minilyzer).
The level measurement is very useful for applications, such as
testing of multicore cables, providing additional information about
the cable quality.
3-14
Measurement Functions
3.7
Signal Balance Error
The signal balance error reflects the deviation from the perfect
balance status. No signal balance error indicates that the absolute
levels at XLR-pin 2 and pin 3 relative to pin 1 (ground) are identical
and opposite in polarity.
Frequency of Signal Balance Balance Indicator
Input Signal
Error
XLR-pin 2,3
Bargraph
Zoom Mode
Input
Level-RMS
Bargraph
Zoom
Control
Bargraph with Scaling Information
Fig 3.15 Signal Balance Error Screen
In the BALANCE mode, the signal balance error is shown in a numerical
value, which is the deviation from the optimum in percent.
Balance Indicator: The direction of the deviation is indicated by the
arrows like 2 < 3 or 2 > 3, whereby the numbers 2 and 3 represent
the signal at XLR-pin 2 and pin 3.
In the Level, THD+N and Polarity (electrical input only) measurement
function, the Minilyzer permanently monitors the balance of the input
signal by a graphical indicator. This enables e.g. to check whether
cable connections are made correctly.
Bargraph: The bargraph shows an analog display of the signal
balance error. The scaling may be controlled automatically or
manually.
• Select manual (M) or automatic (A) scaling by the bargraph zoom
mode field.
• Within the manual scaling press the left/right keys to scroll through
the actual range or the up/down keys to increase or decrease the
range (sensitivity) of the bargraph scale.
• Press enter to confirm your setting.
3-15
Measurement Functions
3.8
Sweep
ML1 supports two sweep modes:
• LEVEL RMS as function of frequency
• LEVEL RMS, THD+N and Frequency as function of time
The required sweep mode may be selected through the SWEEP entry
of the measurement function submenu.
a.
Frequency Sweep
During a frequency sweep, ML1 records the LEVEL RMS of every
input signal that has a stable frequency and level, provided that the
frequency is higher than the one of the previous sample (otherwise
the sample will be neglected).
Measurement Mode
Filter
Arrow Mode
Control
Y-Scale
Zoom Mode
REC /Stop
Control
Arrow Readout
Fig 3.16 Frequency Sweep Graph
Within a graph, every recorded sample is connected by a straight
line approximation to the previous/next sample, thus building the
displayed curve (Fig 3.16).
In practice, the following steps are required / available for the execution
of a frequency sweep.
• To enter the frequency sweep mode, select in the measurement
function submenu SWEEP -> FREQ.
• If required activate a filter through the corresponding menu.
3-16
Measurement Functions
• Arm the sweep recording process by moving the cursor to the
REC field and press the enter key. Make sure that the signal
generator is at its lowest sweep frequency when the recording
process is starting.
• The unit detects the start tone (315 Hz or 1 kHz) of an external
sweep and as soon the frequency changes the recording is
automatically started. This status is indicated by the flashing
REC field.
Alternatively, the sweep recording may be started manually
by pressing the enter key with the cursor on the ARM field.
Consequently, ML1 records every incoming signal with a higher
frequency than the previous sample.
• The sweep recording will be stopped as soon as an input signal
with a lower frequency occurs, or as soon as the enter key is
pressed with the cursor on the flashing REC field.
• In order to analyze the sampled curve more detailed, activate the
arrow mode by placing the cursor to the corresponding symbol,
press the enter key, and move the arrow to the sample(s) of
interest by using the left / right keys.
• To zoom in/out the Y-axis, move the cursor to the zoom mode
field, press enter and use the left / right keys.
• To scroll through the Y-axis, move the cursor to the zoom mode
field, press enter and use the up / down keys.
The last recorded sweep curve will be stored internally, even after
leaving the sweep mode or switching off the Minilyzer. As soon as
the frequency sweep mode is re-entered, the curve will re-appear on
the graph, until a new frequency sweep is started.
NOTES
• As soon as the sweep mode is entered, the filter
that has been active during the recording of the last
curve will be re-activated.
• The auto power off is disabled during a frequency
sweep recording.
3-17
Measurement Functions
b.
Time Sweep
In the TIME SWEEP mode, ML1 records a user-defined number of
measurements in selectable time intervals.
Curve
Arrow Mode
X-Axis Scroll
Indicator
REC / Stop
Control
Mean /
Min-Max
Mode
Y-Axis
Zoom Mode
Scaling refers
to this line
Readout Line
Arrow Readout
Fig 3.17 Time Sweep Graph
Thereby, the unit simultaneously records the mean and the min-max
values of:
• LEVEL RMS and
• THD+N and
• Frequency
The curves of these measurement functions are stored in individual
graphs. Within a graph, every sample is represented by a single dot
only, thus building the displayed curve (Fig 3.17).
In practice, the following steps are required / available for the execution
of a time sweep:
• To enter the time sweep mode, select the entry SWEEP → TIME
in the measurement function submenu.
• If required, activate a filter through the corresponding menu.
• To select the curve to be displayed (LEVEL RMS, THD+N or
Frequency) move the cursor to the curve entry, press enter key,
use the arrow keys and confirm with the enter key.
• To select the mean / min-max mode, move the cursor to the
corresponding field, press enter and the arrow keys.
The curve and the mean/min-max mode can also be
selected after the sweep recording is completed.
• Move the cursor to the REC field and press enter.
3-18
Measurement Functions
A dialog box will open (Fig
3.18) on the graph, where the
sweep duration (min. 60 sec
- max. battery lifetime) and the
recording interval (≥ 1 sec) have
to be entered. Please note that
the number of samples must be
between 60 - 1600.
Fig 3.18 Time Sweep Setup
• To start the sweep recording, move the cursor to the GO! field
and press enter.
• The time sweep automatically stops when the defined duration
has expired. Alternatively, the sweep may be stopped manually
by pressing enter with the cursor on the REC field.
• To display the mean or the min-max values of the recorded sweep,
place the cursor to the corresponding field and select the required
mode by using the enter and the arrow keys.
• In order to analyze the sampled curve more detailed, activate the
arrow mode by placing the cursor to the corresponding symbol
and pressing the enter key. Move the readout line to the sample(s)
of interest by using the left / right keys, or press the up/down keys
to zoom out/in the X-axis.
• To zoom in/out the Y-axis, move the cursor to the zoom mode
field, press enter and
- use the up/down keys to zoom out/in the Y-axis
- use the left/right keys to scroll through the Y-axis.
The last time sweep recording will be stored internally, even after
leaving the sweep mode or switching off the Minilyzer. As soon as the
time sweep mode is re-entered, the last displayed curve will appear
on the graph, until a new time sweep recording is started.
NOTES
• As soon as the sweep mode is entered, the filter
that has been active during the recording of the last
curve will be re-activated.
• If a running time sweep is stopped due to empty
batteries, the recorded data will not be lost.
• The auto power off is disabled during a time
sweep.
3-19
Measurement Functions
3.9
1/3rd Octave RMS
The 1/3rd OCTAVE RMS screen shows the signal frequency spectrum
of the line-in signal, divided into 31 bands.
Arrow Readout
1/3rd Octave
Spectrum
Arrow
Mode
Run/Pause
Scaling
of Y-Axis
Zoom
(Y-Axis)
Time
Constant
Bargraph of Level-RMS (fullband)
Fig 3.19 1/3rd Octave RMS Screen
To enter the 1/3rd OCTAVE RMS mode (Fig 3.19), select 1/3rd OCT.
-> RMS in the measurement functions submenu.
Arrow Readout: The arrow readout displays the frequency and
the level of the 1/3rd octave band that it points to. The arrow
automatically points to the highest level in the 1/3rd octave spectrum,
or, alternatively may be controlled manually.
Arrow Mode: The arrow readout may be moved manually to a certain
specific 1/3rd octave band.
• Select the arrow mode field and press the enter key.
• Move the arrow to any frequency by using the left/right keys.
Run/Pause: The 1/3rd octave spectrum may be freezed.
• Select the run/pause field and press the enter key.
• The1/3rd octave spectrum is freezed.
• The arrow mode or zoom symbol may be selected for the detailed
read out of the 1/3rd octave spectrum.
• At selecting any other field the measurement will be continued.
• Press the enter key again to continue the measurement.
3-20
Measurement Functions
Zoom (Y-Axis): The scaling of the spectrum’s Y-axis (sensitivity) is
fixed and may be adjusted manually.
• Select the zoom (Y-axis) field and press the enter key.
• Use the up/down keys to scroll the displayed level along the Yaxis and the left/right keys zoom out/in the Y-axis, e.g. alter the
resolution of the division.
Time Constant: The time constant corresponds to the integration time
of the 1/3rd octave recording. It may be set to five value: 0.2 / 0.5 /
1.0 / 2.0 / 5.0 seconds. A lower time constant results in a quicker,
more ‘nervous' display, whilst a higher time constant ‘averages’
more samples, thus providing a more stable spectrum.
Bargraph: Below the spectrum, the fullband input RMS level (20 Hz
- 20 kHz) is indicated by a bargraph without auto ranging. Select the
different indication ranges by moving the cursor to the left or right
arrow below RNGE and press enter. The available ranges are:
• -120 to -20 dBu, residual noise of ML1 < -120dBu (<1µV), enables
measurement of low signal levels
• -100 to 0 dBu
• -80 to +20 dBu, please note in this range the residual noise of
ML1 is gained by 20 dBu.
3.10 1/3rd Octave SPL
The 1/3rd OCTAVE SPL screen shows the signal frequency spectrum
of the acoustic signal, divided into 31 bands.
Arrow Readout
1/3rd Octave
Spectrum
Arrow
Mode
Run/Pause
Scaling
of Y-Axis
Zoom
(Y-Axis)
Time
Constant
Bargraph of Level SPL
Fig 3.20 1/3rd Octave SPL Screen
3-21
Measurement Functions
To enter the 1/3rd OCTAVE SPL mode (Fig 3.20), select 1/3rd OCT. ->
SPL in the measurement functions submenu.
Arrow Readout: The arrow readout displays the frequency and
the level of the 1/3rd octave band that it points to. The arrow
automatically points to the highest level in the 1/3rd octave spectrum,
or, alternatively may be controlled manually.
Arrow Mode: The arrow readout may be moved manually to a certain
specific 1/3rd octave band.
• Select the arrow mode field and press the enter key.
• Move the arrow to any frequency by using the left/right keys.
Run/Pause: The 1/3rd octave spectrum may be freezed.
• Select the run/pause field and press the enter key.
• The1/3rd octave spectrum is freezed.
• The arrow mode or zoom symbol may be selected for the detailed
read out of the 1/3rd octave spectrum.
• At selecting any other field the measurement will be continued.
• Press the enter key again to continue the measurement.
Zoom (Y-Axis): The scaling of the spectrum’s Y-axis (sensitivity) is
fixed and may be adjusted manually.
• Select the zoom (Y-axis) field and press the enter key.
• Use the up/down keys to scroll the displayed level along the Yaxis and the left/right keys zoom out/in the Y-axis, e.g. alter the
resolution of the division.
Time Constant: The time constant corresponds to the integration time
of the 1/3rd octave recording. It may be set to five value: 0.2 / 0.5 /
1.0 / 2.0 / 5.0 seconds. A lower time constant results in a quicker,
more ‘nervous' display, whilst a higher time constant ‘averages’
more samples, thus providing a more stable spectrum.
Bargraph: Below the spectrum, the actual sound pressure level is
indicated by a bargraph. Select the different indication ranges by
moving the cursor to the left or right arrow below RNGE and press
enter. The available bargraph ranges are:
• 20 - 100 dBSPL
• 40 - 120 dBSPL
• 60 - 140 dBSPL
3-22
Measurement Functions
3.11 Scope
To activate the SCOPE mode, select the entry SCOPE in the
measurement functions menu.
Measurement
Function
Y-Axis
Scale
X-Axis Scale
Fundamental
Frequency
Fig 3.21 Scope Screen
The SCOPE screen visualizes the waveform of the input signal. It
automatically triggers to the fundamental frequency and selects the
scaling of the X-axis (time) and Y-axis (level) accordingly.
Furthermore, the input signals fundamental or most dominant
frequency is displayed near the lower right corner of the scope
screen.
NOTE
The scaling of the SCOPE display cannot be changed
manually.
3-23
Induction Loop Mode
4.
INDUCTION LOOP MODE
The Minilyzer simplifies verifications and adjustments of AFILS (Audio
Frequency Induction Loop Systems). AFIL systems are used in public
buildings to increase the speech intelligibility for users of hearing aids.
Most hearing aids have a built in magnetic coil receiving audio signals
generated by induction loop systems. AFIL systems consist of a wire
loop and a current amplifier generating a magnetic field into the hearing
aid, modulated by the audio input signal, e.g. voice.
Adjustment and verification of AFIL systems is described in the IEC
60118 standard. The Minilyzer, together with an induction loop receiver,
is an ideal tool to accomplish the necessary measurements.
Induction Loop Receivers
There are various induction loop receivers available from different
AFILS components manufactures. All known types work together with
the ML1. Some receivers have a built in A-weighting filter, which must
be disabled to prevent measurement errors.
Activation of the Induction Loop Mode
• Enter the setup page of the
ML1
• Change the position “Ind.
loop mode” to “ENABLE”
• Press ESC key to exit the
setup page
Fig 4.1 Setup Induction Loop Mode
After this the ML1 restarts in the induction loop measurement mode. To
return to the common ML1 measurement mode, disable the induction
loop mode in the setup page again.
4-01
Measurement Functions
Induction Loop Measurement Menu
The Minilyzer restarts with an specific new AFILS measurement
menu including
• Level, fast weighted
• Level, slow weighting
• Level, PPM
• THD+N
• F-Sweep, frequency sweep
• 1/3rd oct. spectrum analyzer
• Scope
• Calibrate
Fig 4.2 Induction Loop Menu
Units mA/m, dBL
The magnetic field strength is measured in A/m (Ampere per meter).
AFIL systems use 400mA/m as a reference level. The logarithmic unit
of the magnetic field strength is dBL (dB Loop) and has a reference
level of 400mA/m.
dBL1 = 20 * log Magn. field strength
400mA/m
The designator of the unit dBL is not standardized jet - but resulted
of IEC 60118 committee members recommendations.
1
4-02
Induction Loop Mode
Calibration
An induction loop receiver transforms a magnetic field strength to an
electrical level. The receiver sensitivity is specified within the technical
data. Before a valid measurement can be started the ML1 sensitivity
setting must be adjusted accordingly.
Fig 4.3 Calibration Panel
Filters
The ML1 has a built-in A-weighting and a HP400 (high pass 400Hz)
filter, which may be activated using the filter menu. For detailed test
requirements please refer to the IEC 60118 standard. The HP400 filter
has an excellent rejection of mains frequencies, which sometimes is a
dominant part of the signal received by the induction loop receiver.
Fig 4.4 SInduction Loop Filters
4-03
Measurement Functions
Level Fast, Level Slow
Level of the magnetic field strength measured in accordance to
IEC60804 (sound pressure level time weighting) with different
integration times:
Fig 4.5 Level Fast: 125ms
Fig 4.6 Level Slow 1s
Level PPM
Level of the magnetic field
strength measured with a ppm
like peak detector (type IIa).
• Integration time: 10 ms
• dBLp = dB Loop peak
Fig 4.7 Level PPM Screen
THD+N
Total harmonic distortion +
noise
Please refer to the earlier pages
for more details.
Fig 4.8 THD+N Screen
4-04
Measurement Functions
FSweep
Frequency Sweep recording;
Please refer to the earlier
pages for more details.
The frequency tracking will
not work if mains frequency
components dominate the
input signal. Activating the
HP400 filter will attenuate all
main frequency components
and a frequency recording is
possible.
Fig 4.9 F-Sweep Screen
1/3rd Octave
1/3rd octave
analyzer
spectrum
This function shows the
spectrum of the input signal
in 1/3 octave bands. The ML1
input ranging is not necessary
in the induction loop mode and
therefore not included. Please
refer to the earlier pages for
more details.
Fig 4.10 1/3rd oct. Screen
Scope
Time domain of the input
signal in A/m
Please refer to the earlier
pages for more details.
Fig 4.11 Scope Screen
4-05
Troubleshooting
5.
TROUBLESHOOTING
5.1
System Break Down
• Switch the device off.
• Reset the ML1 to the default status by pressing the ESC button
and switching the Minilyzer on simultaneously.
• Release the ESC button.
• The below screenshot, Fig 26, shall appear on the display, stating
on the bottom line LOADING DEFAULT SETUP.
• Verify the correct operation.
Fig 5.1 Start Up Screen Loading Default Setup
In case you find system breakdowns happening several times or your
device is malfunctioning please contact the local NTI representative
in your country. For contact-details please see the NTI web page:
"www.nt-instruments.com".
5.2
Low Level Measurements
The Minilyzer does automatically
recognize the actual input (XLR
or RCA) in use. To measure low
level audio signals (< 70 dBu)
the balanced input shall be used
only. Unbalanced signals need
to be connected to the XLRinput via an XLR/RCA-adapter.
1
2
Hot
3
6-01
Fig 5.2 XLR/RCA Adapter
Accessories
6.
ACCESSORIES
6.1
MiniSPL
The MiniSPL is the perfect accessory
for acoustical measurements.
Together with the Minilyzer ML1 a
comprehensive integrating sound
level meter is formed.
The MiniSPL is a self contained omni
directional 1/2" measuring microphone
with built in impedance converter,
pre-amplifier and power supply. It is
battery powered and the XLR-output is
balanced. The MiniSPL is classified as
type 2 in accordance with IEC 60651.
Fig 6.1 MiniSPL
6.2
MiniLINK
MiniLINK allows documentation and
data acquisition of all ML1 functions
in conjunction with the easy to use
MiniLINK PC software.
MiniLINK is an upgradeable kit for all
existing and new Minilyzers. It consists
of a small plug-in USB interface board
that can be easily installed without any
tools. MiniLINK allows
• Storing measurement results and
screenshots into the ML1 flash
memory
• Logging on-line measurement
results onto the PC
Fig 6.2 MiniLINK
6-01
Accessories
6.3
ML1 Adapter -20dB
The ML1 Adapter -20dB may be applied
for balanced input levels higher than
+20 dBu. This passive adapter extends
the balanced input range of your
Minilyzer up to +40 dBu.
Starting April 2004 this adapter is
supplied with pin1-fuse for safe
operation in combination with the USB
Fig 6.3 ML1 Adapter -20 dB
interface MiniLINK.
6.4
Pouch
The soft pouch protects your
Minstrument against shocks, dust and
water. With its convenient belt-clip you
can keep your Minstrument close to
you even when you need both hands
for other tasks.
6.5
Fig 6.4 ML1 Pouch
Minstruments System Case
Store your valuable Minstruments
test system consisting of the
Minirator MR1, the Minilyzer ML1
and the MiniSPL adequately in
the compact system case which
gives you extra space for cables,
connectors and other accessories
you may wish to bring along when
you are ‘out in the fields’ checking
audio systems.
6-02
Fig 6.5 System Case
Technical Specification
7.
TECHNICAL SPECIFICATION
7.1
Technical Data General Functions
Measurements
- Frequency
- Level-RMS, Level-Relative
- THD+N
- vu+PPM
- Polarity Test
- Signal Balance Error
- Sweep, Frequency Sweep, Time Sweep
- 1/3rd Octave Spectrum
- Scope
Frequency
Range
Resolution
Accuracy
10 Hz to 20 kHz
4 digits
< ± 0.1 %
Level
Units
Resolution
Accuracy
Bandwidth
Flatness
dBu, dBV, VRMS
3 digits (dB-scale) or 4 digits (V-scale)
± 0.5 % @ 1 kHz
20 Hz to 20 kHz
± 0.1 dB
THD+N (Total Harmonic Distortion + Noise)
Meas. Bandwidth 10 Hz to 20 kHz
Resolution
3 digits (dB-scale) or 4 digits (%-scale)
Residual THD+N balanced < -85 dB @ -10 dBu to +20 dBu
unbalanced < -74 dB @ 0 dBu to +14 dBu
vu+PPM (vu-Indicator and Peak Program Meter)
according to IEC 60268 and DIN 45406.
PPM Type I, IIa and Nordic.
Both meters with adjustable reference and
with analog & numerical peak-hold readout.
Polarity Test (with MR1 test signal)
Positive / Negative detection through internal
microphone or XLR/RCA connector. Checks
polarity of tweeters, midrange-speakers,
woofers, sub-woofers and cables. Down to
10 dB S/N ratio of input signal.
7-01
Technical Specification
Signal Balance Error Indication range 0.0 % to 100 %
Deviation from perfect balance in % or *1
Sweep
Frequency Sweep: Level as function of
frequency.
Time Sweep: Measurement of level, THD+N
and frequency as function of time.
1/3rdOctave
Spectrum acc. IEC 1260, class II and ANSI
S1.11-1976, class II from 50 Hz to 20 kHz,
Bargraph for LevelRMS 20 Hz to 20 kHz
Scope
Auto triggering, auto ranging, auto scaling
Filters
Linear, A-weighting, C-weigting, C-message,
Highpass 22 Hz / 60 Hz / 400 Hz, X-Curve-1,
Voice bandpass
Input Connectors
XLR balanced, RCA unbalanced
Input Impedance
40 kOhm balanced, 20 kOhm unbalanced
Input RMS1 ( upper meas. limit )
balanced
+20 dBu (7.75 VRMS)
unbalanced +14 dBu (3.8 VRMS)
Max. DC Input
± 50 VDC
Residual Noise
< 12 µV, XLR-input shorted
Microphone Input (for Polarity measurement only)
Omnidirectional
Monitor Output
Jack 3.5 mm (1/8“), suitable for all common
headsets
Display
Graphic LCD 64 x 100 pixel, with backlight
Batteries
3x AA package dry batteries (alkaline)
Typical battery lifetime > 16 hrs
Dimensions (L x W x H)
163 x 86 x 42 mm (6.4“ x 3.38“ x 1.63“)
Weight
300 g (10.5 oz) incl. batteries
Temperature
0° to +45° C (32° to 113° F)
Humidity
< 90 % R.H., non condensing
1
for input levels > 20 dBu (balanced) the ML1 Adapter -20 dB is
available
7-02
Technical Specification
7.2
Technical Data Acoustic Functions
Measurements
- Sound Pressure Level
- 1/3rd Octave Spectrum
Acoustical Functions
in accordance with IEC61672, Class 2
• Instantaneous Sound Pressure Level (Lp)
• Maximum/Minimum Sound Pressure Level (Lmax/Lmin)
• Time Response selectable
• Weighting Filters
• Equivalent Continuous Sound Pressure Level (Leq)
• Pause- and Continue Function
Sound Pressure Level
Units
dBSPL, dBLeq, dBLAeq, dBLCeq
Resolution
3 digits
Display Ranges
20 - 140 dBSPL in 3 bands 20 - 100 dBSPL
40 - 120 dBSPL
60 - 140 dBSPL
Bandwidth
20 Hz to 20 kHz
Flatness
According to class 1
Time Response
Selectable fast, slow, impuls
Weighting Filters
Selectable A, C, linear,
X-Curve-1 (for 1/3rd octave spectrum only)
Integration
Pause- and Continue Function
1/3rdOctave Spectrum
31 octave band display 20 Hz to 20 kHz
Sensitivity
Selectable default value (MiniSPL),
calibration to external source,
editable sensitivity value
7-03
Test & Calibration Certificate
This is to certify the Minilyzer ML1 is fully tested to the manufacturer’s
specifications.
NTI recommends to calibrate this test instrument one (1) year after
purchase. Thereafter the calibration- and adjustment interval is subsequently one (1) year.
Quick Guide
Minilyzer ML1
E
On / Off (2 sec)
Measurement Function Menu:
LEVEL
THD+N
VU+PPM
POLARITY
RMS
REL
SPL
TYPE I
TYPE IIA
NORDIC
BALANCE
SWEEP
FREQUENCY
TIME
1/3rd OCTAVE
RMS
SPL
SCOPE