Sound level meters

Discover the Norsonic NOR140 Sound Level Meter — engineered for precise, standards-compliant acoustic measurements. Applications Environmental noise assessments Environmental noise monitoring Building acoustics Noise at work Product development Quality control Noise mapping Sound Power Room acoustics Vibration measurements Frontend for Nor850 multichannel system Features Complies to all relevant IEC and ANSI Class 1 specifications. Support for the latest revision of the STIPA standard. Support for the latest revision of the room acoustic RC mark II calculation. Sound recording onto exchangeable SD card. Level vs. Time with multispectrum function from 5 ms resolution. Parallel detection of SPL, Leq, Lmin, Lmax, LE, Lpeak and 8 statistical values. Parallel F, S or I time constants. Measurement of A-weighted levels simultaneously with either C- or Z-weighted levels. Frequency analysis with 1/1-octave or 1/3-octave bands in the 0.4 Hz – 20 kHz range 8000 line FFT analysis with 1.46Hz line resolution. 120 dB dynamic range giving a “one-range” instrument covering all levels from microphone noise floor at 15 dBA to maximum SPL at 137 dBA (140dB peak). Pause/Continue function with 10 sec back erase function. Manual or automatic storage of results with automatic measurement repeat and clock synchronization. Full support for all relevant Building acoustics standards such as ISO 10052, ISO 12283, ISO 140, ISO 717, ASTM E336 and E1007 with on screen sound insulation indexes. Reverberation time calculations. Support SweptSine measurement when controlled from Nor850 or CtrlBuild . Advanced Trigger functions USB 2.0 and RS232 high speed digital interface. Wireless communication using Nor520 Bluetooth transceiver High resolution backlit display. Standards ISO 717-1, ISO 717-2, ISO 10140-2, ISO 10140-3, ISO 10140-4, IISO 16283-1, ISO 16283-2, ISO 16283-3, ISO 354, ISO 3382-2, ISO 10052, ISO 16032, ISO 1996-1, ISO 1996-2, ISO 3746 IEC 61260-1, IEC 61260-2, IEC 61260-3, IEC 61672-1, IEC 61672-1 ANSI S1.4, ANSI S1.11 DIN 45657, DIN 4109-4, DIN 4109-11:2010-05, TA-Lärm BS EN ISO 16283-1, BS EN ISO 16283-2, BS EN ISO 16283-3 NS 4814, NS 4815, NS 8172 SS 25267 SIA 181 I.S. EN ISO 16283-1, I.S. EN ISO 16283-2, I.S. EN ISO 16283-3 Options The Nor140 may be extended with a large selection of optional features, thereby allowing you to tailor the instrument to your specific requirements. Optional features may be ordered and installed at any time by just adding a new set of option codes. Options packages: Nor140/IH Nor140 as Basic Level package (e.g. for Industrial Hygiene) containing options: 04, 05, 06. Nor140/ENV Nor140 as Advanced Level package (e.g. for ENV), containing options: 01, 03, 04, 05, 06, 07, 08, 14, 16. Nor140/BA Nor140 as Advanced Building Acoustics package with on board rating, containing options: 01, 03, 06, 07, 09, 10, 11, 12. Nor140/Cons Option package containing options: 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16. Nor140/AT Audiometer calibration option package containing option 01,03 and 17. Specifications The Nor140 fulfil the following standards set for sound level meters: IEC 61260-1, IEC 61260-2, IEC 61260-3, IEC 61672-1 ISO 717-1, ISO 717-2, ISO 10140-2, ISO 10140-3, ISO 10140-4, ISO 16283-1, ISO 16283-2, ISO 16283-3, ISO 354, ISO 3382-2, ISO 10052, ISO 16032, ISO 1996-1, ISO 1996-2, ISO 3746 ASTM E1007-21, ASTM C423-22, ASTM E336-20, ASTM E90-9, ANSI S1.4, ANSI S1.11, ANSI S1.43, ANSI S12.12-1992 Analouge inputs Number of channels: 1 Input connector: 7 pin LEMO connector for Norsonic microphone systems. Microphone: Nor1225, 1/2”, freefield, 50 mV/Pa. Preamplifier: Nor1209 (Normal) or IEPE-type by menu selection. Preamplifier supply voltage: ±15 volt, max 3 mA Polarisation voltage: 0 V and 200 V, selectable. Maximum input signal: ±11V peak Preamplifier IEPE®: Supply current: 4mA Supply voltage: 24V Input impedance: >100 kΩ, <650 pF Measurement range Measurement range: 0,3 µV – 7Vrms (10 Vpeak) in one range corresponding to -10 dB to 137 dB (140 dB peak) with a microphone sensitivity of 50mV/Pa. Option 18 shifts the measurement range to 147 dB (150 dB peak) by reducing the microphone sensitivity Highpass filter The input section is equipped with an analogue highpass filter to reduce noise from wind or other sources with frequencies below the frequency range for measurements. The filter is switched on if the limited frequency range is selected (>6,3 Hz). Filter type: 3rd order HP filter (-3 dB at 3,4 Hz, Butterworth response). Analogue to digital conversion The analogue input signal is converted to a digital signal by a multirange sigma-delta converter with an effective sampling frequency of 48 kHz. The anti-aliasing filter is a combination of an analogue and a digital filter. Frequency weightings Simultaneous measurement of A and C-weighting or A- and Z-weighting. 1/1 octave band or 1/3 octave band levels may be measured simultaneously if options providing these weightings are installed. 1/1 octave filters: 0,5 – 16000 Hz, class 1, digital IIR filters, base 10 system (IEC 61260) and ANSI S1.11- 2004 Class 1. 1/3 octave filters: 0,4 – 20000 Hz, class 1, digital IIR filters, base 10 system (IEC 61260) and ANSI S1.11- 2004 Class 1. Level detector Detector type: Digital true rootmean-square (RMS) detection, resolution 0.1 dB which may optionally be increased to 0.01 dB for indicated levels in the range –9.99 to 99.99 dB. Crest factor capability: The crest factor is only limited by the peak-value of the signal. Simultaneous measurement of the following functions: SPL, Lmax; Lmin; Leq; LE; Lpeak; LN; LeqI; LEI; LTMax5 Indication range The calibration of the instrument allows microphones with sensitivity in the range -84 dB to +15.9 dB relative to 1V/Pa to be applied. The corresponding display range for the indicated sound level is -50 dB to +180 dB. Self-noise levels The self-noise is measured with the calibration set to –26.0 dB corresponding to a microphone sensitivity of 50mV/Pa. For voltage input, the level 0 dB then corresponds to 1µV. Typical values for the self-noise are 5 dB lower than the values stated. Noise measured with 18 pF microphone dummy and microphone preamplifier Nor1209, averaged over 30 s of measurement time: A-weighted: 13 dB C-weighted: 15 dB Z-weighted: 25 dB 1/3 oct: 6.3 Hz to 250 Hz: 10