Casella CEL Limited 24
OPERATING ENVIRONMENTAL CONDITIONS
Humidity: 5 to 90%RH in the absence of condensation.
Temperature range: -10 to +50
o
C (Class 1), 0 to +40
o
C (Class 2)
Pressure: 65 to 108kPa
EFFECT OF TEMPERATURE
Electrical stability of instrument < ±0.2 dB over the range -10 to +50
o
C
EFFECTS OF HUMIDITY
Less than ±0.5dB over the range 25 to 90% relative humidity (non-condensing),
relative to the value at reference conditions.
STORAGE ENVIRONMENTAL CONDITIONS
Humidity: 0 to 90%RH in the absence of condensation.
Temperature: -20 to +60
o
C.
Pressure: 65 to 108kPa
MICROPHONE
Class 2: CEL-252 ½” Class 2, 30mV/Pa pre-polarised back electret.
Class 1: CEL-251 ½” Class 1, 50mV/Pa pre-polarised back electret.
Note: Instrument has fixed preamp so class is determined by microphone only.
CALIBRATION
Auto calibration by application of 1KHz calibrator, nominal level 114 or 94dB +/-1dB.
Auto calibrated to a user specified reference level with recording of date, time and
offset.
POWER SUPPLY
External DC: 9 to 14V DC at typically 170mA. 2.1mm Power Connector.
Batteries: 3x AA Alkaline or rechargeable cells
Battery Life: Typically >8 hours in Broadband mode with backlight continuously on
low intensity. High backlight setting will have a detrimental affect on battery life.
12 hours measuring with backlight off.
INTERNAL CLOCK:
Date and time accuracy better than 2 sec per day.
LANGUAGES:
English (default), Spanish, French, German, Italian, Portuguese, Chinese, and
Brazilian Portuguese.
ELECTROMAGNETIC COMPATIBILITY
Instrumentation is designed and tested to comply with the following EMC and ESD
Standards:
IEC 61000-4-2 Testing and Measuring Techniques - Electrostatic discharge immunity
tests.
IEC 61000-4-3 Electromagnetic compatibility (EMC) - Radiated electromagnetic field
tests.
IEC 61000-4-6 Electromagnetic compatibility (EMC) - Immunity to conducted
disturbances induced by radio frequency fields. Tested at 10V/m or greater.
EFFECTS OF AC POWER FREQUENCY FIELDS
Less than ±0.5dB change from 74dBA 925Hz reference level when subjected to
160A/m AC magnetic field at 50 and 60Hz.
(29 pages)
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