Appendix A 191
Specifications
ACOUSTICAL DRIVE SIGNAL SINE COMPOSITE
Frequencies 200 to 8000 Hz 200 to 8000 Hz
1/12 oct, nearest in 100 Hz inter-
vals 100 Hz intervals
Frequency accuracy 1 percent 1 percent
Frequency control Left-right buttons not applicable
Amplitude(RMS) Chamber 40 – 110 dB SPL 40 – 110 dB SPL
Amplitude(RMS) Sound Field 40 – 90 dB SPL 40 – 90 dB SPL
(5 dB steps)
Amplitude accuracy 2.5 dB: 500 Hz – 3.5 kHz, otherwise 3.5 dB
(at reference point, right after leveling,
same source as used for leveling)
Attenuator accuracy ±1.0 dB: @1.0 KHz, 40 – 100 dB source
(chamber mode, relative to other
source settings)
Amplitude control Up-Down buttons Up-Down buttons
Amplitude distortion <0.5 percent, not applicable
(at 70 dBSPL) 400 – 2500 Hz
Crest factor not applicable less than 9 dB
DIGITAL READOUT OF SPL
Amplitude readout range at most: -30.0 to 150.0 dB SPL coupler,
-30.0 to 140.0 dB SPL probe
Resolution 0.1 dB SPL
Type of readout
Composite, Coupler Mode: Estimated RMS*
Composite, Real Ear Mode: Estimated RMS*
Pure tone, Coupler Mode
if src>=90 dB: Estimated RMS*
if source <90 dB: Filtered to fundamental frequency
