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
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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
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)