NL-28声级计是日本理音新推出的声级计，NL-28是替代原来NA-27的新产品!
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
