Casella CEL CEL-281 - Manual (Page 131)

Reference frequency:
1 kHz.
Reference direction:
Perpendicular to microphone diaphragm.
Reference SPL & calibration integration time for
sound exposure:
114.0 dB applied for 20 s gives reading of 0.558Pa
2
h.
Stabilisation time:
5 s.
Frequency characteristics:
A- and C-weighting to IEC 651 type 2 between 20 Hz and 20 kHz.
Overload indicator:
Displayed when sound level exceeds 140 dB ±0.5 dB or has
experienced 143 dB ±0.5 dB peak.
Non-linear distortion:
Error < ±1 dB for all frequencies > 10 Hz.
Microphone type:
CEL 1 ⁄ 4 " electret, microphone installed in 9.5 mm energy
absorbing mounting on 0.84 m cable.
Typical sensitivity: 10 mV/Pa.
Page 122 - CEL-281 Operator's Handbook
Technical Information_