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•Sound Level Meter NL-21

•Complies with existing IEC standards and the new IEC/CDV 61672-1 standard (Class 2)
•No range switching required due to the 100 dB wide dynamic range.
•Simultaneous measurement of equivalent continuous sound pressure level Leq,percentile levels(LN),Maximum lebels (Lmax),etc.
•Graph display for sound level fluctuations and back erase function
•Backlit LCD screen for high-visibility display
•One 16 MB Compact Flash card provides up tu 1.3 days of Lp readings taken every 100 ms.
•Timer function for automatic measurement over extended periods
•Dual-measurement function allows setting level determination
•Comparator output function allows setting level determination
•Expansion features, including a range of filter settings, are provided by filter cards
•Power failure compensation function when the AC adapter is used

				NL-21
Applicable standards				IEC60651: 1979 Type 1 IEC60804: 1985 Type 1 IEC/CDV: 61672-1 Class 1
Measurement functions				Sound level (Lp) Equivalent continuous sound presure 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: 28-138 dB C weighting: 33-138 dB Flat: 38-138 dB Peak sound level: 141 dB
Frequency Range				20-8000 Hz (including microphone)
Time weighting				Fast, Slow, Impulse (Impulse is selectable only for auxiliary processing functions)
Microphone				1/2-inch prepolarized condenser type UC-52
Display				Backlit LCD panel (128 X 64 dots+121 icons)
Internal Memory				Manual, Auto(Auto store is possible only when the optional CF card is inserted.)
Power requirement				Four IEC R6 (size "AA") batteries AC adapter NC-34 series (option)
Battery life(LR6)				32h
Dimensions and weight				260 (L) X 76 (W) X 33 (D) mm Approx. 400 g (incl. batteries)