The Nor130 series of SLM fulfil the following Sound Level Meter and 1/1&1/3 octave filter standards: IEC 61260-1, IEC 61260-2, IEC 61260-3, IEC 61672-1, ANSI S1.4, ANSI S1.11, ANSI S1.43, DIN 45657. The Nor131 instrument meets the Class1 requirements while the Nor132 instrument the Class 2 requirements.
English, French and German language support.
Measured Parameters
Simultaneous measurement of SPL, Leq, LMax, LMin, LE and LPeak (plus the Tmax5 for Germany only).
Time weighting functions: Fast, Slow and Impulse.
Spectral weighting functions: Simultaneously measurement of A and C or Z-weighting. Additionally the 1/1 octave real time filters covering all bands from 8 Hz to 16K Hz (option 1) or 1/3-octave covering all bands from 6,3Hz to 20kHz (option 4).
Statistical calculations: 7 fixed percentiles L1%, L5%, L10%, L50%, L90%, L95%, and L99% plus one user defined value (f.ex. L0.1%). The statistical calculation is performed in real time within each frequency band if the filter option 1 is installed.
Measurement range
One range covering 120dB without any range adjustments.
Self noise measured with microphone: 17dBA (25dBA for Nor132)
Maximum RMS level: 137dBA
Maximum Peak level: 140dB PeakC
Levels up to 174dB can be measured by use of a suitable 1/4” microphone.
Battery / power consumption
Battery: 4 cells, IEC LR6, AA-sized, Alkaline batteries are recommended (e.g. Duracell Ultra M3). AA-sized NiCd or NiMH rechargeable batteries may be used, but must be charged outside the instrument. Battery voltage and time on battery since last change of bat-teries are indicated.
Typical battery life time (Duracell Ultra M3): 8 – 12 hours.
External dc: 11 – 16 volt. Power consumption approximately 1.2 watt dependent on selected modes of operation. External DC source should have source-impedance less than 1 ohm and be able to supply at least 300 mA. The mains adaptor Nor340 is recommended for use with the instrument.
If the external supply falls below 9 V, the instrument will use the internal batteries if available. If the instrument has switched off due to loss of power or insufficient supply voltage, the instrument will automatically switch on after reapplying the external DC supply.
Display
The display is a monochrome, trans-reflective LCD graphical display with 160×240 pixels (W×H) with automatic temperature compensation for contrast and viewing angle. Pressing the light key illuminates the display. The light switches off automatically 2 minutes after the last operation of any key.
The bar graph display covers 80 dB, which may be scrolled in 10 dB steps to cover the total range.
Data storage / Data transfer
Measured data is stored in the internal memory of the sound level meter. The memory is of the “flash” type retaining the information without battery supply. Approximately 5 Mbyte is available for the data storage. This corresponds 10 000 measurements for sound level meters without octave analysis and up to 2 500 for sound level meters with octave analysis.
Data transfer via USB 2.0 interface.
Analogue input
Input connector: TNC connector for Norsonic microphone systems.
Preamplifier: Nor1207 IEPE.
Polarisation voltage: 0 V (pre-polarized)
Supply current: 3mA
Supply voltage: 24V
Input impedance: > 100 kohm, <650 pF
Measurement range: 0.3 mV to 7 V (RMS) in one range corresponding to –10 dB to 137 dB with a microphone sensitivity of 50 mV/Pa. The maximum peak value ±10 V corresponds to 140 dB.
Microphone: Nor1228
Analogue outputs
The analogue output is a reproduction of the digitized input signal from the microphone (or input connector) obtained by a digital to analogue converter.
Output voltage: Full scale on the display corresponds to 100 mV.
Output impedance: The loading impedance shall be 16 ohm or greater. The output is short-circuit proof to GND.
Gain accuracy at 1 kHz: ±0.2 dB.
Frequency response re. 1 kHz: ±0.5 dB for 20 Hz < f < 16 kHz.
Environmental conditions
Reference conditions: The reference conditions for the instrument are as specified by IEC 61672-1 .
Temperature: 23°C
Humidity: 50% RH
Atmospheric pressure: 101.325 kPa
Environmental conditions for operation
Temperature: –10°C to +50°C
Humidity: 5% to 90% RH, dewpoint less than 40°C Atmospheric pressure: 85 kPa to 108 kPa
Environmental conditions for storage
Temperature: –30°C to +60°C
Humidity: 5% to 90% RH, dewpoint less than 40°C Atmospheric pressure: 50 kPa to 108 kPa
Dimensions
Depth: 29 mm
Width: 74 mm
Length, excl. microphone/preamplifier: 215 mm,
Length, incl. microphone/preamplifier: 305 mm
Weight incl. batteries: 380 g
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