Specifications

23. Technical Data XL2All specifications are according to the IEC61672 standard. Other standards are listed the corresponding specifications.
Sound Level Meter
Certified
Product Configurations
Class 1

• XL2 with TA-Option, M2230 Microphone andShroud MXA01 form an integrating sound level
meter with type approval in accordance withclass 1 requirements of IEC 61672 and ANSI S1.4

Product Configurations
Class 1The XL2 is identical to the certified configuration,
just using the latest firmware.

Product Configurations
Class 1This prevents possible acoustic reflections from the
XL2 housing and ensures a high measurement accuracy in accordance with the standards IEC 61672
and ANSI S1.4.

Product Configurations
Class 2

• XL2 with M4261 microphone
Class 2 in accordance with IEC 61672 andANSI S1.4

Conforms
with Standards• IEC 61672:2013, IEC 61672:2003,
IEC 61260:2014, IEC 61260:2003,
IEC 60651, IEC 60804, IEC 61183• SMPTE ST 202:2010, ISO 2969:2015• China: GB/T 3785:2010, GB/T 3241, GB 3096-2008,
GB 50526, GB-T 4959
• Germany:» DIN 15905-5, DIN 45657:2014, DIN 45657:2005,
DIN 45645-2» DIN 45645-1(optional with Extended Acoustic Pack)• Japan: JIS C1509-1:2005, JIS C 1513 class 1,
JIS C 1514 class 0• Switzerland: V-NISSG• UK: BS 4142:2014, BS 5969, BS 6698
• US: ANSI S1.4:2014, ANSI S1.43, ANSI S1.11:2014,
ANSI/ASA S12.60• International IEC standards are adopted as European
standards and the letters IEC are replaced by EN.
XL2 conforms to these EN standards.
• WELL Buildings, LEED Green Building• FGI Facility Guidelines Institute

Weighting• Frequency weighting: A, C, Z (simultaneous)• Time weighting: (simultaneous)» Fast, Slow
» Impulse (optional with Extended Acoustic Pack)• XL2 with M2230 microphone
Class 1 in accordance with IEC 61672 andANSI S1.4• XL2 with M2340 microphone
Class 1 in accordance with IEC 61672 andANSI S1.4• XL2 with M2211, M2215 microphone
Class 1 frequency response in accordance withIEC 61672 and ANSI S1.4
These specifications apply for operation with themicrophone attached using the Shroud MXA01 or
the microphone detached using the ASD cable.

276

Specifications

Level Details• Measurement bandwidth (-3dB): 4.4 Hz - 23.0 kHz• Level resolution: 0.1 dB• Internal noise: 1.3 µV A-Weighted

Audio
Recording• Default» Recording of compressed wav-files(ADPCM - 4 bit, 24 kHz)
» a new wav-file starts every 12 hours(max. wav-file size 512 MB)» Bandwidth: 2.0 Hz - 10.2 kHz• Optional: Extended Acoustic Pack
» Recording of linear wav-files (24 bit, 48 kHz)
» a new wav-file starts every 1 hours(max. wav-file size 512 MB)» Bandwidth: 2.0 Hz - 23.6 kHz• Optional: NoiseScout - Managed Mode
» Recording of compressed wav-files(4 bit, 12 kHz)» Bandwidth: 2.0 Hz - 5.1 kHz» requires activated “NoiseScout 365” or“Data Day Credits”• Audio files include meta data (scaling, time, ...) in
Broadcast Wave Format BWF according to EBUTECH 3285

Measurement
Ranges withdifferent
microphones• XL2+M2230: 17 dB(A) - 137 dB• XL2+M2340: 18 dB(A) - 138 dB• XL2+M2215: 25 dB(A) - 153 dB• XL2+M2211: 21 dB(A) - 144 dB• XL2+M4261: 27 dB(A) - 146 dB@ typical microphone sensitivity

Linear Measurement
Range acc.
IEC61672 /ANSI S1.4• XL2+M2230: 24 dB(A) - 137 dB, 27 dB(C) - 137 dB• XL2+M2340: 25 dB(A) - 138 dB, 28 dB(C) - 138 dB• XL2+M2215: 33 dB(A) - 153 dB• XL2+M2211: 29 dB(A) - 144 dB• XL2+M4261: 33 dB(A) - 146 dB@ typical microphone sensitivity

StabilizationTime< 10 seconds

Integration
Time• Minimum: 1 second• Maximum: 100 hours minus 1 second

Display
Measurement
RangesThree level ranges depending on the microphonesensitivity with manual setting. For example:• M2230, M2340 @ sensitivity = 42 mV/Pa» LOW, lower level range: 0 - 100 dBSPL» MID, mid-level range: 20 - 120 dBSPL» HIGH, upper level range: 40 - 140 dBSPL• M2215 @ sensitivity = 8 mV/Pa» LOW, lower level range: 20 - 120 dBSPL» MID, mid-level range: 40 - 140 dBSPL» HIGH, upper level range: 60 - 160 dBSPL• M2211 @ sensitivity = 20 mV/Pa» LOW, lower level range: 10 - 110 dBSPL» MID, mid-level range: 30 - 130 dBSPL» HIGH, upper level range: 50 - 150 dBSPL• M4261 @ sensitivity = 16 mV/Pa» LOW, lower level range: 10 - 110 dBSPL» MID, mid-level range: 30 - 130 dBSPL» HIGH, upper level range: 50 - 150 dBSPL

277

Specifications

Residual
noise in [dB]@S=
42 mV/Paof XL2
without
measurement
microphone• Frequency weighting A
Level range

Leq

Lpeak

LOW

4

17

MID

18

31

HIGH

43

55

• SPL actual, Lmin, Lmax, Lpeak, Leq, Lp• Gliding LAeq and LCeq with selectable time window from one second to one hour(=running Lxeq or sliding Lxeq with x= A or C)• All measurement results simultaneously available• Correction value measurement wizard based on
LAeq, LCeq and LCpeak• Noise exposure level LEX with post-processing• Logging all data or subsets in selectable intervals• Recording of voice notes• Monitoring of sound levels that exceed limits• Digital I/O interface for external peripherals control

Real-Time
Analyzer
RTA• Conforms with class 1 of IEC 61260:2014 and
ANSI S1.11-2014• 1/1 octave band display: 8 Hz - 16 kHz
sub ranges 8 Hz - 4 kHz or 31.5 Hz - 16 kHz
displayed with A/Z broadband levels at one glance• 1/3 octave band display: 6.3 Hz - 20 kHz
sub ranges 6.3 Hz - 8 kHz or 20 Hz - 20 kHz
displayed with A/Z broadband levels at a glance• Level resolution: 0.1 dB• Measurement Units: Volt, dBu, dBV and dBSPL• Band pass filters (base 10) conform with class 1 of
IEC 61260:2014 and ANSI S1.11-2014» 1/1 octave spectrum: > 16 Hz band» 1/3 octave spectrum: > 16 Hz band
• Wide band levels simultaneously• Frequency weighting: X-Curve @ 500 seats in accordance with SMPTE ST 202:2010 and
ISO 2969:2015 (not available for XL2-TA)• Capturing of a single reading into the internal
memory for comparative measurements• Leq logging• Frequency weighting C
Level range

Leq

Lpeak

LOW

3

16

MID

17

30

HIGH

41

55

• Frequency weighting Z

278

Measurements

Level range

Leq

Lpeak

LOW

7

20

MID

21

34

HIGH

46

58

Specifications

RemoteMeasurement(optional)• Querying measurement data online via the USB
interface of the following functions:» Sound level meter and spectrum analyzer
SLMeter/RTA» FFT analyzer» RT60 reverberation time
» Audio analyzer RMS/THD+N» High-resolution spectral analyzer 1/12 Oct + Tol• Typical response time: 10 ms@ querying the frequency spectrum in SLMeter

Functions ofExtended
Acoustic
Pack(optional)• SLMeter/RTA function» Recording of linear wav-files (24 bit, 48 kHz)a new wav-file starts every 1 hour (max. wav-filesize 512 MB)» Percentiles for wide band, 1/1 and 1/3 octave
spectrum- Flexible setting from 0.1% to 99.9%- Sampling: every 1.3 ms- Wide band: in 0.1 dB wide classes, based on
sampling Lxy (x= A, C or Z, y= F, S or EQ1”)- 1/1 and 1/3 octave spectrum: in 1.0 dB wideclasses, based on Lxy (x= A, C or Z, y= F or S)- Dynamic range: 140 dB
Sound Exposure Level LAE» 100ms logging» RTA logging of Lmin and Lmax
» Event-triggered audio and data recording» Time weighting: Impulse(LxI, LxIeq with x= A, C, Z)» True peak level in 1/1 and 1/3 octave resolution» Clock-Impulse Maximum Level (TaktMax) andvalues as specified in DIN 45645-1» Impulsiveness detection in accordance with
BS4142:2014 and NordTest ACOU 112• FFT function» High-resolution Zoom-FFT with selectable frequency ranges and resolution up to 0.4 Hz in therange of 5 Hz to 20 kHz» Recording of linear wav-files (24 bit, 48 kHz)• RT60 function» Reverberation time in 1/3 octave resolution• 1/12 octave Spectral Analyzer» Recording of linear wav-files (24 bit, 48 kHz)279

Specifications

Functions ofSpectral
Limits
Option(optional)

280• SLMeter/RTA function» True peak level in 1/1 and 1/3 octave resolution• FFT function» High-resolution Zoom-FFT with selectable frequency ranges and resolution up to 0.4 Hz» Sound mode: 5 Hz to 20 kHz» Vibration mode: 1 Hz to 20 kHz• 1/12 octave function» High-resolution RTA function “1/12 Oct + Tol”
» Selectable 1/1, 1/3, 1/6 and 1/12 octave spectral
resolution» Frequency band listening at rear speaker» Sound Mode: 11.5 Hz to 21.8 kHz» Vibration mode: 0.73 Hz to 1.36 kHz• FFT and 1/12 octave function» Capturing of multiple readings into the internal
memory» Comparing measurement results against captures with relative or absolute curve display» Comprehensive tolerance handling with tolerance masks based on captures for passed/failed
measurements» Export and import of tolerance and capture files• Noise Curves» Noise Rating NR according to ISO/R 1996-1971» Noise Criteria NC
in accordance with ANSI S12.2-2019 and -1995» Room Noise Criteria RNC
in accordance with ANSI S12.2-2019» Room Criteria RC
in accordance with ANSI S12.2-1995» Preferred Noise Criteriain accordance with ASA 1971

Reporting and Analysis Software
Data
Explorer(optional)• Enables the import of measurement data into the
Data Explorer software• Powerful data processor for easy and fast analysis
of sound level measurement data on PC

Sound
Insulation(optional)• Enables the import of RTA and reverberation timemeasurement data in 1/3 octave band resolution
into the XL2 Sound Insulation Reporter software• Software provides all tools for fast data analysis
and standardized reporting of airborne, impact andfacade sound insulation measurements on PC• Standards ASTM E336, ASTM E413, ASTM E1007,
ASTM E989, ASTM E966, ASTM E1332, BB93,
DIN 4109, Document E, GB/T 19889, ISO 16283,
ISO 140, ISO 717, ISO 10140, NEN 5077:2019, SIA
181:2006, SIA 181:2020

Room
Acoustics(optional)• Frequency response spectrum and Noise Curves• Room acoustic simulation according to Sabine or
Eyring• Import of own sound absorber database and tolerances• Standards GB 50371, IEC 61260, ANSI/ASA S12.22019, DIN 15996:2020, ISO R 1996-1971, ASR
A3.7:2021, DIN 18041:2016, ISO 3382-1:2009,
ISO 3382-2:2008, ÖNORM B 8115-3:2015, ASTM
C423-17, ISO 354:2003

Specifications

Sound
Power
(optional)• Enables the import of RTA and reverberation timemeasurement data in 1/1 and 1/3 octave band resolution into the Sound Power Reporter software• Software provides all the standard reports forsound power measurements• Standards ISO 3741, ISO 3744, ISO 3746, ANSIASA S12.51, S12.54, S12.56

Acoustic Analyzer
FFT Analysis• Real-time FFT with actual level, Leq, Lmin, Lmax
• Level resolution: 0.1 dB• Frequency Band Ranges: 7 Hz - 215 Hz,
58 Hz - 1.72 kHz, 484 Hz - 20.5 kHz with 143 frequency bins shown on display• Measurement Units: Volt, dBu, dBV and dBSPL• Optional with Extended Acoustic Pack or Spectral
Limits: High-resolution Zoom-FFT with selectablefrequency ranges and resolution up to 0.4 Hz in
the range of 5 Hz to 20 kHz• Optional with Spectral Limits:
Capture and tolerance function with multiple readings for comparative measurements and passed/
failed analysis

Reverberation
Time RT60• Conforms with ISO 3382 and ASTM E2235• 1/1 octave bands results from 63 Hz - 8 kHz,based on T20 and T30• Optional with Extended Acoustic Pack:
1/3 octave bands results from 50 Hz - 10 kHz
based on T20 and T30• Range: 10 ms - 30 seconds• Minimum reverberation time (typical)» < 100 Hz: 0.3 second» 100 - 200 Hz: 0.2 second» > 200 Hz: 0.1 second• Measurement based Schroeder-method• Test signal: Impulse source or interrupted pinknoise generated by the MR-PRO, MR2 or the included NTi Audio Test CD / USB Flash Drive281

Specifications

Polarity• Checks polarity of speakers and line signals• Positive/Negative detection of wideband andindividual 1/1 octave bands through internal microphone or XLR/RCA connector• Test signal: NTi Audio polarity test signal generated by the MR-PRO, MR2 or the included NTi
Audio Test CD / USB Flash Drive

Delay Time

• Propagation delay between electrical reference
signal and acoustic signal using the internal microphone• Range: 0 ms - 1 second (0 m - 344 m)• Resolution: 0.1 ms• Test signal: NTi Audio delay test signal generated
by the MR-PRO, MR2 or the included NTi Audio
Test CD / USB Flash Drive

Noise
Curves• Noise Rating NR according to ISO/R 1996-1971• Noise Criteria NC
in accordance with ANSI S12.2-2019 and -1995• Room Noise Criteria RNC
in accordance with ANSI S12.2-2019• Room Criteria RC
in accordance with ANSI S12.2-1995• Preferred Noise Criteriain accordance with ASA 1971
• Application range of measurement microphones:» M2230: down to NC15
» M2340: down to NC15
» M2211: down to NC20
» M4261: down to NC25

282

1/12 Octave
Analysis(optional)• Actual level, Lmin, Lmax, Leq, Leq1”, Leq4”• Selectable 1/1, 1/3, 1/6 and 1/12 octave spectral
resolution• Measurement Units: Volt, dBu, dBV and dBSPL• Band pass filters (base 10)• Capturing of multiple readings into the internal
memory• Comparing measurement results against captureswith relative or absolute curve display• Comprehensive tolerance handling• Creating tolerance masks based on captures forpassed/failed measurements

CinemaMeter(optional)• Measurements in 1/3 octave resolution in accordance with SMPTE ST 202:2010 and SMPTE RP
200:2012• An interactive assistant guides the user throughdedicated measurement procedures.
• Consists of» Spectral Limits Option
NTi Audio # 600 000 376» Cinema Assistant Option
NTi Audio # 600 000 378

Specifications

STIPA
SpeechIntelligibility(optional)• Measurement in accordance with the standards» IEC 60268-16 (edition 2, 3, 4 or 5)» AS 1670.4» BS 5839-8» CEN/TS 54-32:2015» DIN EN 50849:2017» ISO 7240-16» ISO 7240-19:2007» DIN VDE 0833-4» VDE V 0833-4-32:2016» VDE 0828-1:2017-11» NFPA 72» UFC 4-021-01• Direct measurement method (IEC 60268-16)• Frequency range: 125 Hz - 8 kHz in octave band
• Modulation frequencies 0.63 Hz - 12.5 Hz in thirdoctave resolution• Single value STI and CIS test result• Ambient noise correction• Automated averaging of measurements• Modulation indices and individual band level results with error indicator• Test signal: NTi Audio STIPA signal generated by
the MR-PRO, NTi Audio TalkBox or other audio
players (download wav-file at https://my.nti-audio.
com/support/xl2)

Audio Analyzer
Conforms
with Standards• IEC 61672, IEC 60651, IEC 60804• DIN EN 60065, VDE 0860, IEC 468-4

Level RMS

• True RMS detection in V, dBu, dBV, dBSPL(dBSPL not available for XL2-TA)• Power measurement in Watt W or dBm
with flexible load setting from 1.0 to 9999 Ohm• Range XLR/RCA input: 2 µV - 25 V (-112 dBu to+30 dBu)• Accuracy: ± 0.5 % @ 1 kHz,• Flatness: ± 0.1 dB @ 12 Hz to 21.3 kHz• Bandwidth (-3 dB): 5 Hz to 23.6 kHz• Resolution: 3 digits (dB scale),5 digits (linear scale)or 6 digits (x1 scale)

Real-Time
Analyzer
RTA

Following measurement functions offer audio spectrum in Volt, dBu and dBV• Sound Level Meter• FFT• 1/12 Octave (optional with Spectral Limits)

Frequency• Range: 9 Hz to 21.3 kHz• Resolution: 6 digits• Accuracy: < ± 0.003%

THD+N(Total Harmonic
Distortion +Noise)• Range: -100 dB to 0 dB (0.001% to 100%)• Minimum level: > -90 dBu• Fundamental frequency range: 10 Hz to 21.3 kHz• Measurement bandwidth: 2 Hz to 23.6 kHz• Resolution: 3 digits (dB scale) or 4 digits (linear
scale)• Residual THD+N @ XLR/RCA input: < 2 µV

283

Specifications

Scope

Auto ranging, auto scaling

Filter• Frequency weighting: A, C, Z
• Highpass 100Hz, 400 Hz, 19 kHz,• Bandpass 22.4 Hz - 22.4 kHz in accordance with
IEC468-4

RemoteMeasurement(optional)

Querying measurement data online via the USB
interface of the following functions:• Sound level meter and spectrum analyzer
SLMeter/RTA• FFT analyzer• RT60 reverberation time
• Audio analyzer RMS/THD+N• High-resolution spectral analyzer 1/12 Oct + Tol

Calibration
Free-field
Correction• NTi Audio Class 1 Sound Calibrator» M2230: -0.1 dB» M2340: -0.1 dB» M2211: -0.1 dB» M2215: -0.1 dB• NTi Audio Class 1 Sound Calibrator with
1/4” Calibration Adapter, type ADP 1/4-P» M4260: +0.1 dB» M4261: +0.2 dB

Wind Screen
Correction• 50 mm Wind Screen: +0,12 dB• 90 mm Wind Screen: +0,19 dB• WP30/WP61 Wind Screen 90 mm: +0,19 dB

284

Calibration• Recommended calibration interval: one year
• Microphone calibration with external calibrator
supported• Optional calibration certificate for new instruments available

Vibration Meter
Channels• 1 (Single-channel)

Parameters• Real time measurement in» Acceleration: m/s2, g, in/s2, dB» Velocity: m/s, in/s, dB» Displacement: m, in, dB» Peak particle velocity PPV: mm/s, in/s
» Levels: RMS, Peak, Peak-Peak

VibMeter• Broadband level» Frequency range: 0.8 Hz - 2.5 kHz• Spectral» 1/1 octave band display: 1 Hz - 2.0 kHz
sub ranges 1 Hz - 500 Hz or 4 Hz - 2 kHz» 1/3 octave band display: 0.8 Hz - 2.5 kHz
sub ranges 0.8 Hz - 1.0 kHz, 2.5 Hz - 2.5 kHz» Broadband level measured withbandwidth (- 3dB): 0.7 Hz – 23.6 kHz• Display according to DIN 45669-1:2010» Unweighted velocity v(t)» Maximum absolute velocity ¦v¦max» Averaging duration Tm» Measurement duration TM

Specifications

Filter• Flat (no filter)
Bandwidth (- 3dB): 0.7 Hz – 23.6 kHz• 10 - 1000 Hz according to ISO 2954 with decayrate = 18 dB / octave• 1 - 80 Hz, 1 - 315 Hz acc. to DIN 45669-1:2010
with decay rate = 12 dB / octave

Audio
Recording in
VibMeter• Default» Recording of compressed wav-files(ADPCM - 4 bit, 24 kHz)
» a new wav-file starts every 12 hours(max. wav-file size 512 MB)» Bandwidth: 2.0 Hz - 10.2 kHz• Optional: Extended Acoustic Pack
» Recording of linear wav-files (24 bit, 48 kHz)
» a new wav-file starts every 1 hours(max. wav-file size 512 MB)» Bandwidth: 2.0 Hz - 23.6 kHz

FFT Analysis• Frequency range: 1 Hz - 1.69 kHz• Optional with Extended Acoustic Pack or Spectral Limits: High-resolution Zoom-FFT with selectable frequency ranges and resolution up to
0.4 Hz in the range of 1 Hz to 20 kHz

1/12 Octave
Analysis(optional)• Actual level, Lmin, Lmax, Leq, Leq1”, Leq4”• Selectable 1/1, 1/3, 1/6 and 1/12 octave spectral resolution• Measurement Units» Acceleration: m/s2, g, in/s2, dB» Velocity: m/s, in/s, dB» Displacement: m, in, dB• Band pass filters (base 10)• Frequency range: 0.73 Hz - 1.36 kHz

Maximum Input
Level• 353 m/s2, 36 g @ 20 mV/(m/s2)
with ICP Adapter ASD

Residual Noise(typical) withICP Adapter
ASD• 17 µV @ 0.7 Hz ... 23.0 kHz• 14 µV @ 1 Hz ... 315 Hz• 14 µV @ 1 Hz ... 80 Hz

Referencemeasurement
range

• Mid

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Specifications

Input / Output Interfaces
Audio Inputs

Audio
Outputs• Built-in speaker• Headphone connector» 3.5 mm Minijack» mono monitor wired to both channels of stereo
jack» Linear output signal over a measurement rangeof 57 dB in SLMeter measurement function

USB Interface

USB mini connector for data transfer to PC, XL2
Projector PRO and/or charging of Li-Po battery

Digital I/O

Connection interface to accessories• XL2 Input Keypad• Limit Light• Stack Light• Digital I/O Adapter PCB

TOSLink

24 bit linear PCM audio signal output(prepared for later firmware extension)

286

Memory• XLR balanced» Input impedance = 200 kOhm
» Phantom power: +48 VDC switchable with maximum 10 mA supply current in accordance withIEC 61938» Automated sensor detection for NTi Audio’s ASD
measurement microphones and pre-amplifier
MA220• RCA unbalanced with input impedance >30 kOhm
• Built-in condenser microphone for polarity testing,delay measurements and voice note recording

SD Card included (8 GByte), removable, storingmeasurement data in ASCII format, screen shots,
voice notes and wav-files
Data logging every second offers following noisemonitoring periods:• Logging default noise levels: > 2 years• Additional logging of 1/3 octave data: > 6 month• Additional» compressed audio recording: > 1 week
» linear audio recording: > 15 hours
Optional 32 GB SD Cards are available for longer
monitoring requirements; requires XL2 Firmware
V4.10 or higher.

Power
Supply• Rechargeable Li-Po battery included» Type 3.7 V / 2260 mAh» Typical battery lifetime > 4 hours» Range: 3.3 - 4.5 VDC» Volume energy density = 339 Wh/l
• Dry cell batteries type AA, 4 x 1.5 V» Typical battery lifetime > 4 hours» Range: 3.7 - 6.0 VDC• Linear external power supply 9 VDC» Range: 7.5 - 20.0 VDC @ minimum 6 Watt
» Charges Li-Po battery during operation• USB-Power Supply» for short-term operation < 1 day» charging power is equal or less than power consumption

Specifications

Power
Supply• External battery pack» 22 Ah battery pack: 4 days
» 44 Ah battery pack: 8 days

GeneralClock• Default» Real-time clock with lithium backup battery» Typical life backup battery: 8 years» Return instrument for battery replacement» Drift < 1.7 seconds per 24 hours• Special XL2 edition, NTi Audio # 600 000 356» VCXTO clock» Drift < 0.04 seconds per 24 hours

Mechanics• Tripod or microphone stand mount 1/4”
• Wire stand mounted on rear side
• Display: 160 x 160 pixels grey scale with LED backlight
• Dimensions (L x W x H)
» 180 mm x 90 mm x 45 mm» 7.1” x 3.5” x 1.8”
• Weight: 480 g (1 lb) including built-in Li-Po battery

Temperature-10 °C to +50 °C (14° to 122°F)

Humidity

5% to 90% RH, non-condensing

Static airpressure

65 kPa to 108 kPa

Susceptibility to radio
frequencies

Classification Group X

Electromagnetic Compatibility

CE compliant:
EN 61326-1 Class B, EN 55011 class B
EN 61000-4-2 to -6 & -11

Protection
Rating

IP51

ATEX• For applications in explosive atmospheres withinzone 2 in accordance with IEC 60079• Conforms to 2014/34/EU

287

Specifications

24. Technical Data Microphones

Classification with XL2 according to IEC 61672, ANSI S1.4
Consisting of

M2230

M2340
(with self-test)

Class 1
CertifiedClass 1

PreAmplfier
MA220 + MC230
or MC230A
CapsulePreAmplfier
MA230 +
MC230A
CapsuleMicrophone Type

System Self-test (CIC)

Frequency Response
Class 1
PreAmplfier
MA220 +
Capsule 7052

M4261
Class 2

PreAmplfier
MA220 +
Capsule 7056

1/2” detachable with 60UNS2 thread,type WS2F according IEC 61094-4
MA220

MA230

-

with XL2

Flatness tolerance bands
typicalActual Frequency Response

M2215(high levels)

M4261 microphone withpermanently installed
capsuleOmnidirectional, pre-polarized condenser,
free field microphone

Capsule / Transducer
PreAmplifier Type

M2211

1/4” permanently installed

MA220

-

±1 dB @ 5 Hz - 20 Hz±1 dB @ >20 Hz - 4 kHz±1.5 dB @ >4 kHz - 10 kHz±2 dB @ >10 kHz - 16 kHz±3 dB @ >16 kHz - 20 kHz+1/-4.5 dB @ 5 Hz - 20 Hz±1.5 dB @ >20 Hz - 4 kHz±3 dB @ >4 kHz - 10 kHz±4.5 dB @ >10 kHz - 16 kHz±5 dB @ >16 kHz - 20 kHz

freely available as Excel-data, register product at https://my.nti-audio.com and contact info@nti-audio.com

Frequency Range

5 Hz - 20 kHz

Residual Noise Floor typical

16 dB(A)17dB(A)

21 dB(A)25 dB(A)27 dB(A)Maximum SPL@ THD 3%, 1 kHz, S_typical

137 dBSPL

138 dBSPL

144 dBSPL

153 dBSPL

142 dBSPL

288

Specifications

M2230

M2340
(with self-test)

Sensitivity typical @ 1 kHz-27.5 dBV/Pa ±2 dB(42 mV/Pa)

Temperature Coefficient< -0.01 dB / °C

Temperature Range
Pressure Coefficient

M2215(high levels)

M4261-34 dBV/Pa ±3dB(20 mV/Pa)-42 dBV/Pa ±3dB(8 mV/Pa)-36 dBV/Pa ±3 dB(16 mV/Pa)< ±0.015 dB / °C

< ±0.02 dB / °C

-10°C to +50°C(14°F to 122°F)

0°C to +40°C(32°F to 104°F)-0.005 dB / kPa-0.02 dB / kPa

Influence of Humidity(non-condensing)-0.04 dB / kPa< ±0.05 dB

Humidity< ±0.4 dB

5% to 90% RH, non-condensing

Long-term Stability> 250 years / dB

Power Supply
Current Consumption typical

M2211

-

48 VDC phantom power
2.3 mA

0.8 mA

2.3 mA

1.7 mAElectronic Data Sheet

NTi Audio ASD in accordance with IEEE P1451.4 V1.0, Class 2, Template 27

Output Impedance

100 Ohm balanced

Connector

Balanced 3-pole XLR

Diameter Dimensions
Length Dimensions

20.5 mm (0.8”)
154 mm (6.1”)

Weight

150 mm (5.9”)
100 g (3.53 oz)

Environmental Protection
Windscreen Diameter

IP51
50 mm (2”)

Scope of Supply
NTi Audio #83 g (2.93 oz)

90 mm (3.5”)

33 mm (1.3”)

33 mm (1.3”)

33 mm (1.3”)

Windscreen, Microphone Holder with Adapter 5/8“ - 3/8“, Manual
600 040 050

600 040 230

600 040 022

600 040 045

600 040 070
289

Specifications

Outdoor Measurement Microphones

Classification with XL2 according to IEC 61672, ANSI S1.4
System Self-test (CIC)

M2230-WP(M2230+WP30)

M2340-WP(M2340+WP30)

M4261-WP(M4261+WP61)

Class 1
CertifiedClass 1

Class 2

with XL2--

Windscreen Diameter

90 mm (3.5”)

Diameter Dimensions

36 mm (1.4”)

36 mm (1.4”)

36 mm (1.4”)

Length Dimensions

378 mm (14.9”)378 mm (14.9”)378 mm (14.9”)

Weight430 g, 15.17 oz

430 g, 15.17 oz

413 g, 14.57 oz

IP54 in vertical position

IP54 in vertical position

Environmental Protection

IP54 in vertical position

Mounting
Optional Pole Mount Adapter
NTi Audio #290

Standard 3/8” tripod mount included• Pole Mount Adapter PM 1”
for pole diameter 25 - 33 mm (1-1.3”)• Pole Mount Adapter PM 1 1/4” for pole diameter 32 - 44 mm (1.25-1.75”)
600 040 050 + 600 040 060

600 040 230 + 600 040 060

NTi Audio # 600 040 067
NTi Audio # 600 040 068
600 040 070 + 600 040 080

Specifications

Typical Frequency Response of Measurement Microphones
M4261

M2230, M2340,
M2211, M2215

8
Tolerance
Class 1, IEC61672-1

6

Sensitivity relative [dB]

4

2

0

-2

-4

Tolerance
Class 2, IEC61672-1

-6

-8
5

10
10

20		

100				100

log frequency [Hz]

1000
1000

		

10000
10000

20000

(free field conditions @ reference direction 0°)291

Specifications

Linear Measurement Range
acc. IEC61672 / ANSI S1.4
(typ. microphone sensitivity)

292

XL2 + M2230: 24 dB(A) - 137 dB

XL2 + M2340: 25 dB(A) - 138 dB

XL2 + M2211: 29 dB(A) - 144 dB

XL2 + M4261: 33 dB(A) - 146 dB

Specifications

Free Field - Pressure Correction Factors
If a measurement microphone is held in a free-field environment, then the measurement microphone acts at high frequencies like a reflector. The sound pressure increases infront of the microphone capsule membrane. M2230, M2340,
M2211 and M2215 are free-field equalized measurement microphones, they compensate for the increased pressure internally. The calibration of the measurement microphones M2230
and M2340 with the B&K 4226 requires the accessory Adapter
Ring MXR01, NTi Audio # 600 040 105. Please note, nevertouch the diaphragm of the measurement microphone capsule.
The calibrator no longer offers free-field conditions. Therefore,
the free-field equalization of the microphone must be compensated. This needs to be considered prior the calibration. The
correction value needs​​
to be added to the pressure responseof the microphone.
Example:• During the calibration, the XL2 measures the sound level inthe calibrator. If the B&K 4226 calibrator is used and it is set
to 16 kHz, then the XL2+M2230 reads just 86.7 dBA.
• The free-field sound level is calculated by summing the XL2
measurement value and the correction value (86.7 dB +7.3 dB = 94.0 dB).

The following corrections apply with the B&K 4226 calibrator:

NominalFrequency[Hz]

M2230,
M2340
with
MXR01
Adapter[dB]

M2230,
M2340
[dB]

M2211
[dB]

M2215
[dB]

Measurement
Uncertainty U
[dB]

31.5
63
125

-0.3
0.0
-0.2

0.0
0.0
0.0

-0.2
0.0
-0.1

0.0
0.0
-0.1

0.3
0.3
0.3

250
500
1000

-0.2
-0.2
0.0

0.0
0.0
0.0

-0.1
-0.1
0.0

-0.1
-0.1
0.0

0.3
0.3
0.3

2000
4000
8000

0.1
0.7
2.7

0.3
0.7
2.6

0.1
0.7
4.5

0.0
0.4
4.7

0.3
0.3
0.4

12500
16000

7.2
7.3

6.0
7.3

5.8
7.9

6.1
7.9

0.7
0.8

Correction values for​​ other calibrators for M2230 and M2340:
Type

Correction
Value

Calibration
Frequency

Calibration
Level

NTi Audio CAL200

-0.1

1 kHz

114 dB

B&K 4231

-0.2

1 kHz

114 dB

Norsonic Nor-1251

-0.2

1 kHz

114 dB293

Specifications

Actuator Correction
The following free-field 0° incidence corrections apply forcalibration using a protection grid actuator (e.g. B&K UA033,
GRAS RA0014). Please note, never touch the diaphragmof the measurement microphone capsule. The maximum
DC bias for the actuator calibration is 200 VDC.

M2211, M2215
NominalFrequency
[Hz]

M2211
[dB]

M2215
[dB]

31.5
63
125

0.0
0.0
0.0

0.0
0.0
0.0

250
500
1000

0.0
0.1
0.1

0.0
0.0
0.0

2000
4000
8000

0.6
1.7
4.2

0.2
1.2
3.9

12500
16000

7.3
9.2

6.7
9.0

294

M2230, M2340
The calibration requires the accessory Actuator Grid, NTi Audio# 600 040 112. The Actuator Grid comes with an insulation ring
dedicated for this measurement method.
NominalFrequency [Hz]M2230, M2340
[dB]

<400

0.0

400
500
630

-0.2
0.0
-0.2

800
1000
1250

0.0
0.0
-0.1

1600
2000
2500

0.2
0.2
0.3

3150
4000
5000

0.8
1.0
1.6

6300
8000
10000

2.4
3.6
4.8

12500
16000
20000

6.5
9.3
11.7

Specifications

Diffuse-field Sensitivity Level Correction
A diffuse sound field is characterized by the sound arriving at
the receiver from all directions with more or less equal probability. The M2230, M2340, M2211, M2215 and M4261 are
free-field equalized measurement microphones. The default
frequency response refers to a 0° sound incidence. The diffusefield sensitivity level correction is calculated by averaging thedirectional characteristics in accordance with IEC 61183. The
corrections ​​for diffuse-field conditions are documented in thefollowing table and may be activated directly on the XL2; see
Spectral Corrections. The directional response of the M2230 is
described in the appendix.
Example:• The sound pressure level in a diffuse sound field shall be
determined. The display of the XL2 with the M2230 reads
80.0 dBA for the 20 kHz third-octave band.
• The diffuse sound level is now calculated from the sumof the XL2 measurement value and the correction value(80.0 dB + 5.9 dB = 85.9 dB).

The diffuse-field sensitivity level correction is
not necessary using a diffuse field equalizedmeasurement microphone.

NominalFrequency[Hz]1/2” Microphone
M2230, M2340,
M2211, M2215[dB]

1/4” Microphone
M4261

<63
63
80

0.0
0.0
0.0

0.0
0.0
0.0

100
125
160

0.0
0.0
0.0

0.0
0.0
0.0

200
250
315

0.0
0.0
0.0

0.0
0.0
0.0

400
500
630

0.0
0.0
0.0

0.0
0.0
0.0

800
1000
1250

0.0
0.0
0.1

0.0
0.0
0.1

1600
2000
2500

0.2
0.2
0.4

0.1
0.1
0.2

3150
4000
5000

0.6
0.8
1.3

0.3
0.3
0.5

6300
8000
10000

1.8
2.5
3.4

0.8
1.1
1.6

12500
16000
20000

4.4
5.3
5.9

2.2
2.8
3.4

[dB]

295

Specifications

Free-field and Diffuse-Field Sensitivity for M2230 and M2340
1100

idealized
free-field-1-1

sensitivity relative [dB]

-2
-2
-3
-3
-4
-4

diffuse
field

-5
-5
-6
-6
-7
-7
-8
-8

10
10

20		

100				100

log frequency [Hz]

296

1000
1000

		

10000
10000

20000

Specifications

Spectral Correction for horizontal Sound Incidents using the Outdoor Microphone
The outdoor measurement microphone fulfills the requirements of IEC 61672 and ANSI S1.4 for vertical sound incidence.
For compliance with horizontal sound incidence a spectral correction is employed in the associated XL2 Sound Level Meter.

Spectral Correction for horizontal sound incidents:
NominalFrequency
[Hz]

WP30
Weather Protection
[dB]

WP61
Weather Protection[dB]

1/3 Octave

1/1 Octave

1/3 Octave

1/1 Octave

<800

0.0

0.0

0.0

0.0

800
1000
1250

0.0
0.0
0.1

0.0

0.0
0.0
0.0

0.0

1600
2000
2500

0.2
0.3
0.7

0.4

0.2
0.3
0.8

0.4

3150
4000
5000

1.3
2.0
2.7

2.0

1.4
2.1
2.5

2.0

6300
8000
10000

2.9
3.3
3.9

3.4

2.3
2.4
2.8

2.5

12500
16000
20000

4.6
6.4
6.8

5.9

3.0
3.1
3.1

3.0

Select Calibrate Menu: Show Spec Correction in the System Settings. This will enable the spectral correction field in
the Calibration menu.
297

Specifications

25. Technical Data PreAmplifier
MA220 PreAmplifier
Microphone PreAmplifier
Frequency Range (-3dB)
Residual Noise Floor typicalFrequency Response Flatness

MA230 PreAmplifier
with self-test (CIC)

Compatible with 1/2” microphone capsules type WS2F in accordance with IEC61094-4
4 Hz - 100 kHz

1.3 Hz - 50 kHz

1.9 mV(A) at C_in 15 pF ≙ 5.6 dBA @ 42 mV/Pa

2.4 mV(A) at C_in 15 pF ≙ 9.1 dBA @ 42 mV/Pa±0.2 dB

Phase Linearity
Maximum Output Voltage@ THD 3%, 1 kHz
Electronic Data Sheet

Impedance±0.1 dB, 10 Hz - 20 kHz< 1° @ 20 Hz - 20 kHz
21 Vpp ≙ 7,4 Vrms ≙ 138,9 dBSPL @ 42 mV/Pa

22 Vpp ≙ 7,8 Vrms ≙ 139,3 dBSPL @ 42 mV/Pa

Containing user calibration data; default factory sensitivity = 4.9 V/Pa
Read/write by XL2 Audio and Acoustic Analyzer
NTi Audio ASD in accordance with IEEE P1451.4 V1.0, Class 2, Template 27
Input: 20 GOhm // 0.26 pF, Output: 100 Ohm balanced

Power Supply

48 VDC phantom power, 2.3 mA typical

48 VDC phantom power, 0.8 mA typicalAttenuation< 0.17 dB (Rphantom 2x 6.8 kOhm)< 0.07 dB (Rphantom 2x 6.8 kOhm)

Connector

Balanced 3-pole XLR

Thread for Capsule

60 UNS2

WeightDimensions

90 g, 3.17 oz
Length 142.5 mm (5.6”), diameter 20.5 mm (0.8”)

Temperature Range-10°C to +50°C (14°F to 122°F)

Humidity
NTi Audio #5% to 90% RH, non-condensing
600 040 040

The product specifications may vary based on the mounted microphone capsule type.
298

600 040 200