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The NL52 is a SLM meets the following Sound Level Meter standards: IEC 61672-1: 2013/2002 class 1, ANSI/ASA S1.4-2014/Part1 class 1, JIS C 1509-1: 2017 class 1. The measurement functions include simultaneous measurement of the following items with selected time weighting and frequency weighting. Processing on the main channel enable Instantaneous sound pressure level, equivalent continuous sound pressure level, sound exposure level, maximum sound pressure level, minimum sound pressure level, and percentile sound levels: (0.1 to 99.9%, 0.1-increment steps, max 5 values)
In addition to main processing items, one of the following can be selected for simultaneous processing:
Microphone: UC59 with a sensitivity level of -27dB
Frequency range 10 Hz to 20 kHz
Frequency weighting A, C, and Z
Time weighting F (Fast) and S (Slow)
Level range Single range (Linearity range: 113 dB)
Bar graph display range max Max. 110 dB (20 to 130 dB)
Switching of bar graph display Set the upper/ lower limit in 10 dB increments.
RMS detection circuit Digital processing method
Sampling cycle 20.8 μs (Lp, Leq, LE, Lmax, Lmin, Lpeak : sampling frequency: 48 kHz) 100 ms (LN )
Calibration Electrical calibration performed according to IEC and JIS standards, using internally generated signals: acoustic calibration performed with the NC-75.
Correction functions Windscreen correction: Compliant with IEC 61672-1 and JIS C 1509-1 standards when the windscreen is installed. Diffuse sound field correction: Correction of frequency characteristics in order to comply with standards (ANSI S1.4) in diffuse sound field.
Delay time The meter can be set to start measuring a specified time (OFF, 1, 3, 5 or 10 s) after the start button has been pressed or when a user-set trigger is exceeded.
Back erase function When the PAUSE key is pressed to pause measurement, the preceding (user selectable) 0, 1, 3 or 5 s data are excluded from processing.
Display Backlit semitransparent color TFT LCD display WQVGA (400 x 240 dots) ＊LCD with touch panel (Capacitive Touch Panel) Numerical display update frequency: 1 s Bar graph update frequency: 100 ms
Storage Manual Data for measurement results are stored manually in single address increments. Number of data Internal memory: max. 1000 sets SD Card: depends on the capacity of the SD Card＊1
Storage Auto＊2 Instantaneous values (Lp mode) and processed values (Leq mode) are stored continuously and automatically at preset intervals.
Data recall Allows viewing of stored data
Setup memory Up to five setup configurations can be saved in internal memory, for later recall Start up via file settings previously stored on SD card possible
DC output Output DC signals using a frequency weighting characteristic selected by processing.
AC output Output AC signals using a frequency weighting characteristic selected by processing or by A, C, Z-weighting.
USB Allows USB to be connected to a computer and recognized as a removable disk Allows USB to be controlled via communication commands
RS-232C communication Allows for RS-232C communication via use of a dedicated cable
Data continuous output＊2
Output interval 100 ms
Power requirements Four IEC R6 (size AA) batteries (alkaline or rechargeable batteries) or external power supply
Dustproof / water-resistant performance＊4
IP code: IP54 (except for microphone) See precautions regarding waterproofing
Dimensions, weight Approx. 250 (H) x 76 (W) x 33 mm(D), approx. 400 g (with batteries)
Supplied accessories Storage case x 1, Windscreen WS-10 x 1, Windscreen fall prevention rubber x 1 Hand strap x 1, LR6 (AA) alkaline batteries x 4, SD card 512 MB×1 (NX-42EX preinstalled model only)storage mode(depends on the capacity of the SD card)＊1
*1 Use Rion fully guaranteed products. *2 NX-42EX required (sold separately). *3 NX-42WR required (sold separately). *4 Protection against harmful dust and water splashing from any direction.
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