Casella CEL CEL-281 - Manual (Page 132)

CEL-6225 Dust Cover has no measurable effect on acoustic
performance of microphone.
Electrical substitution of microphone input for
calibration:
Not recommended to be performed by unqualified personnel.
The procedure requires the microphone assembly to be replaced
by the CEL-6100 Dummy Microphone and recommends use of
an oscillator with 600
Ω impedance.
Consult CEL for precise details.
Operating environment:
Temperature: -10 to +50
o
C,
(Effect on
accuracy: ±0.5 dB re 20 o
C at 65% RH),
Atmospheric
Pressure: 101.3 kPa ±10%
(1013 mbar, 760 mmHg),
Humidity: 30 to 90% RH (non-condensing),
(Effect on
accuracy: ±0.5 dB re 65% RH at 40 o
C),
Magnetic Fields: Negligible effect,
Vibration:
Negligible effect.
Storage environment:
(without batteries)
Temperature: -10 to +50
o
C,
Humidity: 30 to 95% RH (non-condensing).
Consult the battery Manufacturer for storage conditions with
batteries.
Technical Information
CEL-281 Operator's Handbook - Page 123