Casella CEL CEL-62X - Manual (Page 31)

9. APPENDIX B ADDITIONAL INFORMATION
IEC61672-1:2002 section 9.3 (Information for testing)
a) Reference Sound Pressure Level
The reference sound pressure level is selectable to be 94 dB or 114 dB.
b) Reference Level Range
The CEL-62X is a single level range instrument of 0 to 140 dB.
c) Microphone Reference Point
The microphone reference point is the centre of the diaphragm of the
microphone. The 0
o reference direction is perpendicular to the microphone
diaphragm.
d) Acoustical Frequency Response Testing
The pressure to free field correction data for the CEL-251 microphone used for
periodic testing.
Frequency 0
o
Free
Field
Corrections
using a
Bruel &
Kjear 4226
Calibrator
0
o
Free
Field
Corrections
with Wind
Screen
using a
Bruel &
Kjear 4226
Calibrator
0
o
Free Field
Corrections
using a
Bruel &
Kjear
UA0033
Electrostatic
Actuator
0
o
Free Field
Corrections
with Wind
Screen using
a Bruel &
Kjear
UA0033
Electrostatic
Actuator
Expanded
Uncertainty
of
Corrections
at 95%
probability
(k=2)
Hz dB dB dB dB dB
31.5 -0.1 -0.1 -0.1 -0.1 0.2
63 -0.2 -0.2 -0.2 -0.2 0.2
125 -0.2 -0.2 -0.2 -0.2 0.2
250 -0.2 -0.2 -0.2 -0.2 0.2
500 -0.2 -0.2 -0.2 -0.2 0.2
1000 0 0.1 0 0.1 0.2
2000 0.3 0.7 0.3 0.7 0.3
4000 0.7 1.4 0.8 1.5 0.3
8000 2.8 2.5 3.1 2.8 0.4
12500 5.3 4.1 6.2 5.0 0.6
16000 6.4 4.5 7.8 5.9 0.6
Casella CEL Limited 31