XL2 Audio and Acoustic Analyzer

Sound Level Meter

Product Configurations	• XL2 + M2210: • Class 1 frequency response according IEC 61672, IEC 60651 • Type 1 frequency response according ANSI S1.4 • XL2 + M4260: • Class 2 according IEC 61672, IEC 60651 • Type 2 according ANSI S1.4
Conforms with Standards	• IEC 61672, IEC 60651, IEC 60804, IEC 61260 class 0, ISO 2969 • China: GB/T 3785:2010, GB/T 3241, GB 3096-2008, GB 50526, GB-T_4959-1995 • Germany: DIN 15905-5, DIN 45645-2, optional: DIN 45645-1 • Japan: JIS C1509-1:2005, JIS C 1513 class 1, JIS C 1514 class 0 • Switzerland: SLV 2007 • US: ANSI S1.4, ANSI S1.43, ANSI S1.11-2004 class 1 • International IEC standards are adopted as European standards and the letters IEC are replaced by EN. XL2 conforms to these EN standards.
Measurements	• SPL actual, Leq, Lmin, Lmax, LCpeak • Gliding LAeq with t = 5”, 10’, 15’ and 60’ • All measurement results are simultaneously available • Correction value measurement wizard • Noise curves NC, NR, PNC, RC with post processing • Noise exposure level LEX with post processing • Logging all data or subsets in selectable intervals • Recording of wav-files (ADPCM), a new wav-file starts every 12 hours (max. wav-file size 512 MB) • Recording of voice notes • Limit monitoring showing exceeding sound levels • Digital I/O interface for control external peripherals • Level Resolution: 0.1 dB • Internal noise: 1.3 µV A-Weighted
Weighting	• Frequency weighting: A, C, Z • Time weighting: Fast, Slow, optional: Impulse • Measurement Bandwidth (-3dB): 2 Hz to 23.6 kHz
Real Time Analyzer	• Frequency Resolution: 1/3 octave, 1/1 octave, wide band • Frequency Range: 6.3 Hz to 20 kHz • Level Resolution: 0.1 dB • Band pass filters conform IEC 61260 class 0, ANSI S1.11-2004, class 1 • Frequency weighting: X-Curve acc. ISO 2969 • Capturing of single reading into the internal memory for comparative measurements

Options for Sound Level Meter and Acoustic Analyzer

Remote Measurement (optional)	• Querying measurement data online via the USB interface
Functions of Extended Acoustic Pack (optional)	• SLMeter/RTA function - Percentile statistics for wide band, 1/1 and 1/3 octave spectrum: . 1%, 5%, 10%, 50%, 90%, 95%, 99% . Sampling: every 1.3 ms . Wide band: in 0.1 dB wide classes, based on sampling LAF . 1/1 and 1/3 octave spectrum: in 1.0 dB wide classes,   based on Lxy (x= A, C or Z, y= F or S) . Dynamic range: 140 dB - Time weighting: Impulse - Sound Pressure Level LIeq - Sound Exposure Level LAE - Event-triggered audio and data recording - Recording of wav-files (24 bit, 48 kHz), a new wav-file is started after each hour (max. wav-file size 512 MB) - True peak level in 1/1 and 1/3 octave resolution - Clock-impulse maximum level (TaktMax) and values as specified in DIN 45645-1 • FFT function - High-resolution Zoom-FFT with selectable frequency ranges and resolution up to 0.4 Hz in the range of 5 Hz to 20 kHz • RT60 function - Reverberation time RT60 in 1/3 octave resolution
Functions of Spectral Limits Option (optional)	• 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 in the range of 5 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 • 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 - Creating tolerance masks based on captures for passed/failed measurements - Export and import of tolerance and capture files

Acoustic Analyzer

FFT Analysis	• Real time FFT with actual level, Leq, Lmin, Lmax • Level Resolution: 0.1 dB • Frequency ranges: 7 Hz - 215 Hz, 58 Hz - 1.72 kHz, 484 Hz - 20.5 kHz with 142 frequency bins shown on display • Optional: High-resolution FFT, up to 0.4 Hz resolution in the range of 5 Hz - 20 kHz • Optional: Capture and tolerance function with multiple readings for comparative measurements and passed/failed analysis
Reverberation Time RT60	• 1/1 octave bands results from 63 Hz - 8 kHz, based on T20 • Optional: 1/3 octave bands results from 50 Hz - 10 kHz, based on T20 • Range: 10 ms - 14 seconds • Measurement according to ISO 3382 by Schroeder-method • Test signal: Impulse source or gated pink noise generated by the MR-PRO, MR2 or the included NTi Audio Test CD
Delay Time	• Propagation delay between electrical reference signal and acoustical signal using the internal microphone • Resolution: 0.1 ms • Range: 0 ms - 1 second (0 m - 344 m) • Test signal: NTi Audio delay test signal generated by the MR-PRO, MR2 or the included NTi Audio Test CD
Polarity	• Checks polarity of speakers and line signals • Positive/Negative detection of wideband and individual 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
1/12 Octave Analyzer (optional)	• Actual level, Leq, Lmin, Lmax • Selectable 1/1, 1/3, 1/6 and 1/12 octave spectral resolution • Capturing of multiple readings into the internal memory • Comparing measurement results against captures with relative or absolute curve display • Comprehensive tolerance handling • Creating tolerance masks based on captures for passed/failed measurements
STI-PA Speech Intelligibility (optional)	• Single value STI and CIS test result according to IEC 60268-16 (2003),  ISO 7240-16 and ISO 7240-19 (replacing IEC 60849), DIN VDE 0828-1, DIN VDE 0833-4 • Modulation indices and individual band level results with error indicator, post processing with recorded spectra supported • Test signal: NTi Audio STI-PA signal generated by the MR-PRO, NTi Audio TalkBox or the STI-PA Test CD

Audio Analyzer

Level RMS	• True RMS detection in V, dBu, dBV and dBSPL • 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 (-3dB): 5 Hz to 23.6 kHz • Resolution: 3 digits (dB scale) or 4 digits (linear scale)
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: 5 Hz to 23.6 kHz • Resolution: 3 digits (dB scale), 5 digits (linear scale) or 6 digits (x1 scale) • Residual THD+N @ XLR/RCA input: < 2 µV
Scope	Auto ranging, auto scaling
Filter	Frequency weighting: A, C, Z Highpass 100 Hz, 400 Hz, 19 kHz Bandpass 22.4 Hz - 22.4 kHz acc. IEC468-4
Remote Measurement (optional)	• Querying measurement data online via the USB interface

Input / Output Interfaces

Audio Inputs	• XLR balanced with input impedance = 200 kOhm, phantom power: +48 V switchable, automated sensor detection for M4260/M2210 microphones • RCA unbalanced with input impedance >30 kOhm • Built-in condenser microphone for polarity testing, delay measurements and voice note recording
Audio Outputs	• Built-in speaker • Headphone connector 3.5 mm Minijack Stereo
USB Interface	USB mini connector for data transfer to PC and charging of Li-Po battery
Serial I/O	Optional 1-wire interface for control of external peripherals
TOSLINK	24 bit linear PCM audio signal output (optional, prepared for later firmware extension)
Memory	Mini-SD card included (2 GByte), removable, storing measurement data in ASCII format, screen shots, voice notes and wav-files
Power Supply	• Rechargeable Li-Po battery included, type 3.7 V / 2260 mAh, typical battery lifetime 4 hours • Dry cell batteries type AA, 4 x 1.5 V, typical battery lifetime 4 hours • Linear external power supply 9 VDC (charges Li-Po battery in operation) • Range: 7.5 - 23.0 VDC @ minimum 6 Watt

General

Clock	Real time clock with lithium backup battery
Calibration	• Recommend calibration interval: one year • Microphone calibration supported with external calibrator • Calibration certificate for new instruments optional available
Mechanics	• Tripod mount and wire stand mounted on rear side • Display: 160 x 160 pixels grey scale with LED back light • Dimensions: 180 mm x 90 mm x 45 mm (7.1” x 3.5” x 1.8”) • Weight: 480 g (1 lbs) including built-in Li-Po battery
Temperature Range	-10 °C to +50 °C (14° to 122°F)
Humidity	5% to 90% RH, non condensing
Electromagnetic Compatibility	CE compliant: EN 61326-1 Class B, EN 55011 class B, EN 61000-4-2 to -6 and -11

All information are subject to change without notice.

Typical Frequency Response*

* NTi Audio defines tighter tolerances lines than specified in the standard IEC 61672. These tolerances are shown as thicker grey lines.

All information are subject to change without notice.