FEATURES
&< Selectable application modules for measuring wide range of acoustic parameters
&< Internal 1/1 and 1/3 octave filters
&< 25 to 130dB measuring range
&< 128 x 64 graphic LCD with back-lit
&< Lower back ground noise
&< Comply with IEC 61672-1: 2002 class 1
USES
&< Precision acoustics measurements
&< Frequency analysis in 1/1 and 1/3 octave filters with Modular A
&< Environmental noise measurement and 24 hour monitoring with Modular B
&< Reverberation time measurements with Modular A
&< Airport Noise Monitoring and data collect with Modular C
PERFORMANCE SPECIFICATIONS
Standard: Complies with IEC 61672 class 1
Meas. Range : 25 dB ~ 130 dB(A) (re. 20 μPa)
Freq. Range: 10 Hz ~ 20 kHz
Freq. Weighting: A, C, F (flat)
Time Weighting: F, S (Exp. average (RMS) , and Lin. Average
Level Linearity Range: 70 dB
Range: 10 ~ 80 dB, 20 ~ 90 dB, 30 ~ 100 dB, 40 ~ 110 dB , 50 ~ 120 dB , 60 ~ 130 dB
INPUT
Mic.: 1/2" Prepolarized Condenser Mic.
Sensitivity: approach 50 mV/Pa
Freq. Range: 10 Hz ~ 20 kHz
Freq. Response: Free field
Polarized Voltage: 0 V
Ref. direction: Axial direction of microphone
Mic. Preamplifier
OUTPUT
Detector: Digital detector
Indicator: 128 x 64 graphic LCD with back-lit
AC Output (full scale): 1.1V AC RMS
Output Impedance: 600 _ Connector: 3.5 mm jack plug
DC Output (full scale): 2.75 DC V, 0.25 V/dB
Output Impedance: 1000 _ Connector: 3.5 mm jack plug
http://www.set-ndt.ru/category_16.html
Digital I/O: RS-232C Interface
Connector: RJ45 plug
POWER SUPPLY
Batteries: 6 × LR6
Operating Voltage: 6.5 ~ 9 V DC
Operating current: ≈80 mA
Battery Life: ≈20 hours (continuous use)
External Power: 9 V DC 200 mA
Connector: 1.1 mm coaxial plug
ENVIRONMENT
Temperature: -10°C ~ 50°C
Humidity: 25% ~ 90% (R.H)
Atmospheric Pressure: 650 hPa ~ 1080 hPa
PHYSICAL
Dimensions: NL270: 290 (H) x 90 (W) x 38 (D) mm; Carrying case: 120 (H) x 500 (W) x 300 (D) mm
Weight: NL270: ≈500 g (including batteries); Carrying case: 3.5 kg (including NL270 and all accessories)
Mounting Screw: UNC 1/4" for direct connection to tripod
ACCESSORIES
Included: 1/2" Prepolarized Condenser Mic. , windscreen Ø80 mm x 1, RJ45-RS232 data cable x 1,
LR6 battery x 1, disc x 1, instrument manual x 1
Available: Noise Analyser, Sound Level Calibrator
5 m extension cable, 2 m mic. support rod, SLM tripod, carrying case
A/B/C three modulars mentioned may be selected and combined by users as follow:
Model A - Spectrum Analysis and Reverberation Time Measurements
Meas. Parameters: Lp, Tr (reverberation time)
Measuring Range of Reverberation Time: 0.3 s ~ 10 s
Time Weighting: F, S ( Exp. average )
Store Capacity: 2000 groups of graphs/spectrums or reverberation time data
Internal Filter: 1/1 and 1/3 Octave band pass filters conform to IEC 61260 class 2
Center Frequency of 1/1 Octave Filter: 1/1 Octave:31.5 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz,
4 kHz, 8 kHz, 16 kHz
Center Frequency of 1/3 Octave Filter: 20 Hz, 25 Hz, 31.5 Hz, 40 Hz, 50 Hz 63 Hz, 80 Hz, 100 Hz, 125 Hz,
160 Hz, 200 Hz, 250 Hz, 315 Hz,
400 Hz, 500 Hz, 630 Hz, 800 Hz, 1 kHz, 1.25 kHz, 1.6 kHz, 2.0 kHz, 2.5 kHz, 3.15 kHz, 4 kHz, 5 kHz, 6.3 kHz,
8 kHz, 10 kHz, 20 kHz
Display: Measured parameters and spectrum graphs and graph of change of instantaneous SPL
Model B - Statistical Analysis
Meas. Parameters: Lp, Leq, Lmax, Lmin, and L5, L10, L50, L90, L95,SD and Ld, Ln, Ldn
Meas. Time: Manual, 10 s, 1 min, 5 min, 10 min, 15 min, 20 min, 30 min, 1 h, 4 h, 8 h, 24 h (once per hour)
Time Weighting: F, S ( Exp. average ) and Linear average
Sampling Period: 0.1 s, 0.2 s, 0.5 s, 1 s, 2 s, 5 s, 10 s
24 Hours Automatic Monitoring: measuring once per hour
Intelligent Delete: Burst event may be deleted scientifically
Store Capacity: 2000 groups of data or 80 days of 24 h data
Display: Measured parameters and statistical and accumulated distribution graphs, 24 h distribution graphs
and graph of change of instantaneous SPL
Model C - Integrating and Airport Noise Measurements
Meas. Parameters: Lp, Leq, Lmax, Lmin, LAE, E, LEPN
Meas. Time: Manual, 10 s, 1 min, 5 min, 10 min, 15 min, 20 min, 30 min, 1 h, 4 h, 8 h, 24 h
Time Weighting: F, S ( Exp. average ) and Linear average
Sampling period: 0.1 s, 0.2 s, 0.5 s, 1 s, 2 s, 5 s, 10 s
Sampling Parameters: Lp, Leq. 1s
Store Capacity: 2000 groups of data or 480,000 time stamped results
Display: Measured parameters and graph of change of instantaneous SPL and calculated airport LEPN.
