CASELLA CEL CEL-490 Instrukcja Użytkownika Pobierz pdf (Strona 56)

CEL-63x Environmental Noise Meter

56 Casella CEL

5.11 Correction filters

Built-in correction filter for random incidence sound pressure fields.

5.12 Reference direction

For free-field measurements the reference direction is perpendicular to the

microphone diaphragm.

5.13 Reference conditions

23 °C air temperature

50 % relative humidity (RH)

101.325 kPa atmospheric pressure

Nominal reference level = 114.0 dB at 1 kHz

5.14 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

5.15 Effects of temperature

Electrical stability of the instrument <±0.2 dB over the range –10 °C to +50 °C

5.16 Effects of humidity

Less than ±0.5 dB over the range 25 % to 90 % RH (non-condensing) relative to

the value under reference conditions.

5.17 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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CASELLA CEL CEL-490 Instrukcja Użytkownika Strona 56