NL-28聲級計是日本理音推出的聲級計，取代NL-27，比27具有更多的功能，測量范圍更廣130dB,

產品型號：理音NL-28

更新時間：2025-04-21

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噪音計

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使用噪音計要注意以下幾點操作

噪音的危害與控制

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數(shù)字噪音計在城市噪音污染的科學監(jiān)測

產品介紹

NL-28聲級計是日本理音推出的聲級計，NL-28是替代原來NA-27的新產品!

上海熙浩代理銷售日本理音噪音計，：（銷售部）

Sound Level Meter and 1/3 octave band real-time analyzer NA-28

Real Time Octaves （16 Hz to 16 kHz） or 1/3 octaves （12.5 Hz to 20 kHz）
Real Time Simultaneous Octaves （16Hz to 8kHz） and 1/3 Octaves （12.5Hz to 12.5kHz）
Data stored as text files direct to CF card
Measures and logs eq, max, min and 5 percentile values （LN） in octaves and/or 1/3 octaves
Auto Stores 300 000 data sets or 1 000 hours of 1 second 1/3 octaves onto 1 GB CF card
Auto Stores 1000 data sets or 10 000 of 1 second 1/3 octaves to internal memory
Manual Storage for 1 000 data sets internally or 100 000 data sets to 1 GB CF card
Linearity 110 dB in Sound Level Meter Mode and 95 dB in Analyzer Mode
16 hours battery life with 4 Alkaline"C" Cells
Main and Sub-Channel for simultaneous selection of 2 time or frequency weightings F（Fast）, S（Slow）, 10 ms Time Weightings plus Peak & Impulse on Sub-Channel
Data transfer using CF card or USB （meter/CF card appearing as virtual disk）
Measurement can be started by internal or external trigger
Comparator output to trigger external devices
AC and DC outputs of main and/or sub-channel
Expandable functionality using programme cards
IEC 61672-1:2002 Class 1，IEC 61260:1995 Class1，ANSI S1.4-1983 Type 1，ANSI S1.11-2004 Class 1

Specification ：

Applicable specifications	IEC 61672-1:2002 Class 1, IEC 61260:1995 Class 1, ANSI S1.4-1983 Type 1, ANSI S1.11-2004 Class 1
Measurement functions	With both a sound level meter mode and analyzer mode, it is capable of simultaneous main channel and sub-channel measurement in either mode. Time and frequency weighting are set separay for the main and sub-channels.
Measurement modes	Sound level meter mode: Measurement of all-pass values indicated in the measurement items below in the main or sub-channel, Measurement of either Lpeak or Ltm5 in the sub-channel Analyzer mode : Real-time octave and 1/3 octave band analysis and all-pass measurement in the main channel, Only all-pass measurement in the sub-channel
Measurement items	Simultaneous measurement of all items in the selected time weighting and frequency weighting characteristics Instantaneous sound pressure level Lp, Equivalent continuous sound pressure level Leq, Sound exposure level LE, Maximum sound pressure level Lmax, APMax and BandMax can be selected as maximum, Minimum sound pressure level Lmin, Maximum 5 time ratio sound level LN （1 to 99%, 1% Step）, Calculation from Lp or Leq 1sec
Measurement time	1 to 59 sec, 1 to 59 min, 1 to 24 hours
Microphone and preamplifier	Microphone UC-59, Preamplifier NH-23
Measurement range	A: 25-130dB, C: 33-130dB, Z: 38-130dB
Frequency Range	10 Hz-20 kHz
Time weighting	Main:Fast, Slow, 10ms Sub:Fast, Slow, 10ms, Impulse
Display	Color semi-transparent TFT-LCD display with backlight （240 X 320 dots）
Power requirement	Four IEC R14P （size"C"） batteries or external power supply Operating time Manganese batteries: R14PU, 6 hours Alkaline batteries: LR14, 16 hours （10 hours if backlight is continuously activated）
Dimensions and weight	331 （H） X 89 （W） X 51 （D） mm , approx. 730 g （including batteries）