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） |
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