Larson Davis System 824, Reference Manual

Page: 23 / 536

11/8/00 Introduction 1-5
AUD: Gives the 824 the ability to certify audiom-
eters; used in conjunction with the AUDit soft-
ware (optional)
TAL: Measures tonality according to DIN 45681
and appraisal of low frequencies according to DIN
45680 (optional)
• Type 1 precision integrating sound level meter (satisfies
IEC 60651-1993, IEC 60804-1993, and ANSI S1.4
1985)
• 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 instru-
ments)
• 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)
• Real-time 1/3 octave spectrum analysis with rapid spec-
trum vs. time autostorage and triggering for sound decay
measurement (RTA)
• Simultaneous operation of sound level meter with inde-
pendent 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 window (FFT Mode)