Keterangan :

Features
Sound Level Meter NL-20 
Conpliant with IEC standards and new IEC/ CDV 61672-1 standrd
Wide dynamic range of 100 dB eliminates need for range switching
Simultaneous measurement of equivalent continuous sound level
Graph display shows sound lebel fluctuation; available when using back-erase function
Easy-to-read backlit LCD display
Up to 34 hours of continyous operation possible with four IEC R6 ( size AA) alkaline batteries; external power supply by AC adapter.

Product Details

Applicable standards
IEC60651: 1979 Type 2
IEC60804: 1985 Type 2
IEC/ CDV: 61672-1 Class 2
Measurement functions
Sound level ( Lp)
Equivalent continuous sound pressure level ( Leq)
Sound exposure level ( LE)
Maximum ( Lmax) and Minimum ( Lmin) sound pressure level
Percentile sound pressure level ( LN) ( 5 selectable settings)
Measurement range
A weighting: 28-138dB
C weighting: 33-138dB
Flat: 38-138dB
Measurement range
A weighting: 28-138dB
C weighting: 33-138dB
Flat: 38-138dB
Frequency range 20-8000 Hz ( including microphone)
Time weighting Fast, Slow
Microphone 1/ 2-inch elected condenser type UC-52
Display Backlit LCD panel ( 128 X 64 dots+ 121 icons)
Power requirement Four IEC R6 ( size " AA" ) batteries AC adapter NC-34 series ( option)
Battery-life 34 hours
Dimensions and weight 260 ( L) X 76 ( W) X 33 ( D) mm; Approx. 400g ( incl. batteries)