CEL-63x Environmental & Occupational Noise Meter
61 Casella CEL
6.10 Time weightings
Fast (F), Slow (S) and Impulse (I) according to IEC 61672-1: 2002.
6.11 Correction filters
Built-in correction filter for random incidence sound pressure fields.
6.12 Reference direction
For free-field measurements the reference direction is perpendicular to the
microphone diaphragm.
6.13 Reference conditions
23 °C air temperature
50 % relative humidity (RH)
101.325 kPa atmospheric pressure
Nominal reference level = 114.0 dB at 1 kHz
6.14 Operating environmental conditions
Humidity 5 % to 90 % RH non-condensing
Temperature –10 °C to +50 °C (Class 1)
0 °C to +40 °C (Class 2)
Pressure 65 kPa to 108 kPa
6.15 Effects of temperature
Electrical stability of the instrument <±0.2 dB over the range –10 °C to +50 °C
6.16 Effects of humidity
Less than ±0.5 dB over the range 25 % to 90 % RH (non-condensing) relative to
the value under reference conditions.
6.17 Storage environmental conditions
Humidity 0 % to 90 % RH non-condensing
Temperature –20 °C to +60 °C
Pressure 65 kPa to 108 kPa
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