코엔텍

□ NL-21 장비 특징

 - IEC/CDV 61672-1 Class2 규격 적합
 - 넓은(Dynamic)측정 범위(100dB)로 사용 중 변경 불필요
 - 동시에 Leq,LN, Lmax 동시 측정 가능
 - 적은 전력 소모로 34시간 연속 측정 가능
 - A, C, FLAT 주파수 특성
 - AC/DC 출력 가능
 - RS-232C Inteface
 - Data Memory 가능(100개)

□ NL-21 장비 사양

 - Measurement functions :
          Sound level LP, Equivalent continuose sound level Leq
          Sound exposure level LE
          Maximum sound level Lmax
          Minimum sound level Lmin
          Percentile sound level LN(5 selectable settings)
 - Measurement Time : 10sec, 1, 5, 10, 15, 30minutes, 1, 8, 24 hours, and manual(maximum 200 hours)
 - Measurement Range :
          A weighting : 28 to 138 dB
          C weighting : 33 to 138 dB
          FLAT            : 38 to 138 dB
 - Inherent Noise
          A weighting      :  20 dB or less
          C weighting      :  20 dB or less
          FLAT                  :  32 dB or less
          Linearity Range :  100 dB
          Reference Sound Pressure Level : 94dB
          Reference Level Range : 30 to 120 dB
 - Level Range Selection
          6 ranges in 10-dB steps 20 to 80 dB
                                                  20 to 90 dB
                                                  20 to 100 dB
                                                  20 to 110 dB
                                                  30 to 120 dB
                                                  40 to 130 dB
 - Frequency Range
            Overall characteristics including microphone : 20 to 8000 Hz
            Electrical circuit characteristics - AC output    : 10 to 20000 Hz
            Electrical circuit characteristics - RMS            : 10 to 140000 Hz
 - Frequency Weighting
            A, C, FLAT
            RMS detection Digital processor
            Time weighting : Fast, Slow
 - Calibration
            Electrical calibration with 1-kHz sine wave signal from built-in oscilator
            Acoustic calibration using sound calibrator
            Sampling interval 30.3㎲(Leq, LE)
                                          100ms(LN)
 - Microphone
            1/2-inch electret condenser type
            Model          : UC-52
            Preamplifier : NH-21
 - Dimensions
            Apporx, 260 × 76 × 33mm
 - Weight(excluding batteries)
            Apporx, 400g