C-12 824 Reference Manual 9/29/09
NOTE: Ranges are in dBSPL using a
typical 377B41 microphone with a
sensitivity of 44.5 mV/Pa and a 200V
polarization voltage. A 2540 normal
sensitivity microphone produces high
limit values approximately 10.0 dB
higher.
NOTE: Ranges are in dBSPL using a
typical 377B41 microphone with 44.1
mV/Pa sensitivity. The range is measured
between a low limit of peak error > 0.5
dB and a high limit of overload.
Peak Measurement Range (LOG and ISM modes only)
Low Limit High Limit Range
A-WT (high) 73 148 75
A-WT (normal) 53.0 128.0 75.0
A-WT (low) 53.0 108.0 55.0
C-WT (high) 73 148 75
C-WT (normal) 53.0 128.0 75.0
C-WT (low) 53.0 108.0 55.0
FLAT (high) 80 148 68
FLAT (normal) 60.0 128.0 68.0
FLAT (low) 60.0 108.0 48.0
SSA Mode Specifications (IEC 61260 Class 1)
Broadband Overall
time weighting:
Slow, Fast, Impulse,
TWA and Peak
1/3 octave filter time
weighting:
Slow, Fast
Broadband Frequency
Weightings
A, C and Flat (see
table on page C-7)
Dynamic range: > 93 dBA (overload to
noise floor)
Linearity range: > 80 dBA
Pulse range: > 83 dBA
RMS noise floor: < 33 dBA typical with
PRM902, 377B41
microphone, and 0 dB
gain
Reference level range: 0 dB gain
Exchange rates: 3, 4, 5, or 6 dB
Sample rate: 51,200 Hz
1/3 octave band
frequencies:
12.5 Hz - 20 kHz
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