Casella CEL CEL-368 - Manual (Page 88)

Correction for microphone extension cable:
No significant effect with CEL extension cables up to 100 m.
With other cables, or for greater accuracy, calibrate after
installation.
Verification reference conditions:
Free field perpendicular incidence,
Ambient temperature: 20
o
C,
Measurement Range: 70 to 140 dB,
Relative Humidity: 65%,
SPL: 114 dB,
Frequency: 1 kHz.
Effect of humidity on accuracy:
Less than 0.5 dB over the range 30 to 90% RH (provided
there is no condensation), relative to the value at 65% RH and
40
o
C.
Storage range: 20 to 95% RH non-condensing.
Effect of temperature on accuracy:
Less than 0.5 dB over the range -10 to +50 o C.
Storage range: -20 to +60
o
C.
Effect of vibration on accuracy:
Less than 6 dB when tested according to IEC 651 clause 8.3.
Effect of magnetic fields on accuracy:
Negligible at all sound levels.
CEL-268/368 Handbook Page - 87