Nor 140
20Pages

2 Features: • Handheld real-time 1/1- or 1/3-octave frequency analyser • Measurement of A-weighted levels simultaneously with either C- or Z-weighted levels • Parallel detection of SPL, Leq, Lmin, Lmax, LE and Lpeak • 120 dB dynamic range giving a “one-range” instrument • Measures Lpeak levels up to 140 dB • Parallel detection of F, S and I time constants • USB 2.0 and High-speed RS-232 serial interface (115 kbaud) • SD memory card and large high speed internal memory • Sound recording in 8, 16 or 24 bit format with 12 or 48 kHz sampling • High-resolution graphical backlit display • Manual...

4 With the introduction of the precision handheld sound analyser Nor140, Norsonic sets a new standard for sound level meters, covering the widest range of applications. The Nor140 is packed into the smallest real time analyser featuring sound recording present on the market today. Norsonic’s philosophy has always been to cover all possible applications within one modular instrument platform. We were the first company introducing software options. This enables functional expansion to take place when you need it and not necessarily at the time you purchase the instrument. The design is based...

5 The instrument platform By listening to key customers and our long experience in designing sound level meters, every effort has been made to design a rugged, small and lightweight, yet powerful instrument platform. User friendly The large backlit display with a mirror effect is excellent to read in sunlight. The backlight is only needed in dark environments. The instrument is designed to be operated by the same hand that holds the instrument. There is no need for a stylus. Real keys ensures tactile feedback to the user. The dust and splash proof rubber covers for the connectors and SD...

6 Four types of storage modes are supported: Manual The user manually stores the measurement. Automatic The instrument stores all results automatically when a measurement is completed or if stop is pressed. Repeat Same as automatic but it automatically restarts a measurement. Synchronous Same as repeat but the first measurement will be truncated to allow synchronisation to the next whole measurement period (eg. the first full hour) Interfaces and connectors The instrument has one USB 2.0 high-speed data interface and one high speed RS232 interface. The multi I/O socket additionally contains...

7 The Measured functions The functions available with the Nor140 include SPL Time-weighted Sound Pressure Level (F, S, I) Lmax Maximum Time-weighted Sound Pressure Level Lmin Minimum Time-weighted Sound Pressure Level Leq Time-Average Sound Pressure Level LeqI Time-Average Impulse-weighted Sound Pressure Level LE Sound Exposure Level Lpeak Maximum Peak Level LN Statistically Calculated Exceedance Level The spectral weighting functions A- and C- or Z-weighting are available for all functions including the Lpeak. The SPL, Lmax and Lmin functions are measured for all the three time constants...

8 Environmental noise monitoring Huge m • emory, both internal and on a removable SD card • Sound recording • 8 marker functions • Precise internal clock for accurate timing between several Nor140 instruments • Profi le measurements with level vs. time resolution from 25ms to 199h • Multi spectrum • Statistical calculations, even in frequency bands • 120dB dynamic range, also for the 1/1-octave and 1/3-octave real time fi lters • Pure tone detection • Microphone check • Advanced post processing reports using NorReview software • Lden calculation using NorReview software The large memory and...

9 to a conventional sound level meter and as such often have complicated set up and calibration procedures. Any error in these procedures could easily result in the failure to collect valid evidence of the alleged offence. A novel approach to these systems is embodied in the Nor140 through its digital recording of the actual sound at the same time as the measurement; hence there is no longer a need for a separate DAT recorder; everything is within the analyser! All calibration and range settings automatically relate to both the measurement and recording part of the system greatly...

10 S. The correct sound reduction index (R’w, DnT,w, Dn,w, Ln,w or LnT,w) is then presented graphically on the instrument screen. Alternatively, the Nor140 may be used to measure the survey grade sound insulation based on 1/1- octave real-time frequency spectra in accordance with the ISO 10052 Standard. Reverberation time measurements The Nor140 measures the reverberation decay based on either impulse or noise excitation. All frequency bands are measured either in 1/1- or 1/3-octave real-time spectra, and presented on the screen one-by-one. Two reverberation time values are calculated for...

11 On-board noise generator The Nor140 is equipped with an on-board noise generator supplying both white and pink noise. During the level and reverberation time measurements, the generator is turned on and off in synchronization with the actual measurements. Complete reports The Nor140 building acoustics measurements are seamlessly transferred to a PC for further postprocessing. The full sound insulation report is generated by use of the NorBuild software package, and the final report sheets are calculated in accordance with ISO 140/717, ASTM or other national standards. Remote measurement...

12 Sound power Sound power level may be calculated from sound pressure level measurements using almost any type of sound level meter. However, the methods described in the different standards involve quite a lot of calculation before the final sound power figure can be reported. The Nor140 supports measurements and calculations according to ISO 3746 on board. You simply specify measurement surface, its dimensions, the location of your measurement object (on the floor, against a hard reflecting wall or in a corner), apply the correction factors and start your measurement. The sound power...