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RION Sound Level Meter NL-27(Class 2)

Ultra compact and lightweight; fits into a pocket.
General-purpose sound level meter.

Sound Level Meter


NL-27(Class 2)




  • Wide linearity range; from 30 to 130 dB without range switching.
  • Quick start up and easy operation to measure Lp, Leq, Lmax, LE and LCpeak.
  • Frequency range: from 20 Hz to 8 kHz
  • Frequency weighting: A and C



Standard compliance General-Purpose Sound Level Meter according to Japan Measurement Law JIS C 1509-1: 2017 class 2,
IEC 61672-1: 2013 class 2
CE mark, 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 peak 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 137 dB,
C-weighting: 36 dB to 137 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: 30.3 μs (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 ℃ to +50 ℃, 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,
Silicone cover × 1, strap × 1, AAA [IEC R03] alkaline battery × 2

* Due to integrated construction of unit and preamplifier, microphone extension is not possible

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