C-18 824 Reference Manual 9/29/09
RTA Mode Specifications
Filter types: Flat, A or C
preweighted 1/3 or 1/1
octave filters with
broadband SPL
Averaging
Exponential:
Linear:
Overall time:
1/32, 1/16, 1/8, 1/4, 1/2,
1, 2, 4, 8, 16, 32, 64
seconds
0.0025 to 99.995
seconds
> 1 year
Linearity range: > 80 dB 1/3 octave
>75 dB 1/1 octave
Reference level range: 0 dB gain
Sample rate: 51,200 Hz
1/3 octave band
frequencies:
12.5 Hz - 20 kHz (33
filters)
1/1 octave band
frequencies:
16 Hz - 16 kHz (11
octaves)
Filter integrated
response:
±0.15 dB for all filters
Real-time operation: ±0.3 dB error for all
filters tested with a
swept sinusoidal input
Anti-aliasing: 75 dB
Summation of output
signals:
±1.0 dB (±0.4 typical)
Flat frequency
response:
10 Hz - 20 kHz, relative
attenuation <±0.15 dB
Filter type: Digital
Octave frequency ratio: Base 2
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