1-8 824 Reference Manual 9/29/09
• Simultaneous measurement of sound pressure level using
Fast, Slow, Impulse, Peak, and Leq detectors with A, C,
and Flat weighting (SSA, ISM, LOG, and TAL
instruments)
• Exceptionally large dynamic range (> 93 dB for SSA and
> 115 dB for ISM and LOG)
• Digital filters with real-time rate to 20 kHz satisfying
IEC 1260-1995 Class 1 and ANSI S1.11-1986 Type 1-D
meeting linearity specifications over a range of 85dB:
- 1/1 octave, 16 Hz to 16 kHz (11 filters)
- 1/3 octave, 12.5 Hz to 20 kHz (33 filters)
• Automatic logging of sound level parameters including
Interval data, L
n
statistics, noise event detection using
exceedance history and exceedance time history (LOG
only)
The windspeed (tacho) and wind
direction (throttle position) feature
requires the firmware option 824-
WND, not included with standard
System 824 configurations.
• Measurement of windspeed (tacho) and wind direction
(throttle position) using external weather transducers
with inclusion of data in Views and Data Displays for
SSA and LOG instruments.
• Real-time 1/3 octave spectrum analysis with rapid
spectrum vs. time autostorage and triggering for sound
decay measurement (RTA)
• Simultaneous operation of sound level meter with
independent frequency and 1/3 octave analyzer function
weighting (SSA)
• Advanced time history feature allows you to store up to
38 different parameters including spectral data with each
time history sample
• Narrow band real-time frequency analysis with 400-line
FFT and Hanning, Flat-Top or Rectangular window (FFT
Mode)
• Standard memory (2 MB) sufficient to store one of the
following:
- 30,000 point 1/3 octave SSA Leq time history
- 20,000 intervals with 1/3 octave Leq spectrum
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