Sound Level Meter NL-27 Rion 

Specifications

Standard compliance

General-Purpose Sound Level Meter according to Japan 

Measurement Law JIS C 1509-1: 2005 Class 2, IEC 61672-1: 2002 Class 2 

CE mark ( EMC Directive 2004/108/EC ), WEEE Directive

Measurement functions Processing functions  ( normal mode )

Sound level Lp, equivalent continuous sound level Leq, sound exposure level LE, maximum sound level Lmax, peak sound level Lcpeak ( only when eak range was selected )

Measurement time settings

1 min, 5 min, 10 min, 1 h

Microphone

1/2 inch electret condenser microphone Model : UC-52,  sensitivity level : - 33 dB ± 3 dB ( re.1 V/Pa )

Measurement level range ( normal mode )

A-weighting: 30 dB to 130 dB,

C-weighting: 36 dB to 130 dB

Linear operation range ( A-weighting, 1 kHz )

30 dB to 137 dB

Peak sound level measurement range

65 dB to 140 dB

Residual noise level

A-weighting: max. 24 dB, C-weighting: max. 30 dB

Measurement frequency range

20 Hz to 8 kHz

Reference frequency, reference sound pressure level

Reference frequency : 1 kHz, reference sound level : 94.0 dB

Frequency weighting characteristics

A-weighting, C-weighting

Time weighting characteristics

F ( Fast ), S ( Slow )

Level range

Wide range : 30 dB to 130 dB, peak range* : 65 dB to 130 dB ＊Peak range is used for peak sound level measurements

RMS detection method

Digital processing

Processing

Digital sampling cycle : 30.3μs ( Lp, Leq, LE, Lmax, Lpeak )

Calibration

Calibration frequency: 1 kHz,

Calibration sound level: 94 dB

Japan Measurement Law: electrical calibration with internal

Signal source; JIS, IEC: acoustic calibration using NC-74

Windscreen

Unit is compliant with JIS C 1509-1 Class 2 and IEC 61672-1

Class 2 with and without windscreen

Display ( TN positive display, reflective )

Numeric display : 0.1 dB resolution 

Bar graph : Scale range 100 dB, 5 dB resolution ( update frequency 0.1 s ) 

Warning indicators : Over ( Overload ) appears at 137.4 dB ( 1 kHz ) Under ( Underload ) appears from -0.6 dB of lower scale limit Battery capacity 3-stage indicator for remaining capacity

Store function ( processing results saved in internal memory, using manual store )

Number of data: 199 Stored data can be checked on recall screen

DC output connector

DC output: 3 V ( full scale ), 25 mV/dB, output impedance : 50 Ω Load impedance : 10 kΩ or more

AC monitor output connector

AC output: 1 Vrms +600 -400 mVrms ( at 110 dB ), overload: +2 dB 

Output impedance : 600 Ω, load impedance : 10 kΩ or more, frequency weighting : Z-weighting

USB connector

For transfer of stored data to a computer, using optional USB adapter cable

Power requirements ( size AAA [ IEC R03 ] battery x 2 Normal temperature )

Current consumption: approx. 80 mA ( 3 V operation ) 

Battery life : approx. 9 hours ( with alkaline batteries ), ( Wide range ) approx. 3 hours ( with manganese batteries )

Temperature / humidity range for operation

-10 °Cto +50 °C, 10 % to 90 % RH ( no condensation )

Dimensions, weight

Approx. 120 mm ( H ) × 63 ( W ) × 23.5 mm ( D ), approx. 105 g ( including batteries )

Supplied accessories

Windscreen × 1, Windscreen fall prevention rubber× 1, Silicon cover × 1, strap × 1, AAA [ IEC R03 ] alkaline battery × 2