主要性能

• 實時1倍頻程(16Hz到16kHz)分析或者1/3倍頻程(12.5Hz到20kHz)分析
• 實時同時進行1倍頻程(16Hz到8kHz)分析和1/3倍頻程(12.5Hz到12.5kHz
• 測量數據作為文本文件直接地保存到CF存儲卡
• 測量和記入1倍頻程分析和/或者1/3倍頻程分析的Leq、Lmax、Lmin和5個百分位聲級電平(LN)
• 自動保存300000個數據集或者1000小時1秒1/3倍頻程到128MCF存儲卡
• 自動保存1000個數據集或者100個1秒1/3倍頻程到內存
• 人工保存1000個數據集到內存或者100000個數據集到128MCF存儲卡
• 線性操作量程:聲級計工作方式(全通)為110dB;分析機工作方式(頻譜)為95dB
• 用4節C號尺寸堿性電池使用壽命為14小時
• 在主、次通道上同時選用時間加權和頻率加權
• 在次通道上實現F(快)、S(慢)、10ms時間加權加上峰值和脈沖
• 用CF存儲卡或者USB傳遞數據(聲級計/CF存儲卡作為虛擬盤)
• 能用內部或者外部觸發器開始測量
• 比較器輸出到觸發器外部裝置
• 主通道和/或者次通道的AC輸出和DC輸出
• NL-28聲級計是日本理音最新推出的聲級計，NL-28是替代原來NA-27的新產品!

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

  1. Real Time Octaves (16 Hz to 16 kHz) or 1/3 octaves (12.5 Hz to 20 kHz)
  2. Real Time Simultaneous Octaves (16Hz to 8kHz) and 1/3 Octaves (12.5Hz to 12.5kHz)
  3. Data stored as text files direct to CF card
  4. Measures and logs eq, max, min and 5 percentile values (LN) in octaves and/or 1/3 octaves
  5. Auto Stores 300 000 data sets or 1 000 hours of 1 second 1/3 octaves onto 1 GB CF card
  6. Auto Stores 1000 data sets or 10 000 of 1 second 1/3 octaves to internal memory
  7. Manual Storage for 1 000 data sets internally or 100 000 data sets to 1 GB CF card
  8. Linearity 110 dB in Sound Level Meter Mode and 95 dB in Analyzer Mode
  9. 16 hours battery life with 4 Alkaline"C" Cells
  10. Main and Sub-Channel for simultaneous selecion of 2 time or frequency weightings F(Fast), S(Slow), 10 ms Time Weightings plus Peak & Impulse on Sub-Channel
  11. Data transfer using CF card or USB (meter/CF card appearing as virtual disk)
  12. Measurement can be started by internal or external trigger
  13. Comparator output to trigger external devices
  14. AC and DC outputs of main and/or sub-channel
  15. Expandable functionality using programme cards
  16. IEC 61672-1:2002 Class 1，IEC 61260:1995 Class1，ANSI S1.4-1983 Type 1，ANSI S1.11-2004 Class 1

• 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 separately 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)

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