Casella CEL CEL-63X - Manual (Page 62)

CEL-63x Environmental & Occupational Noise Meter
62 Casella CEL
6.18 Microphones
CEL-251 ½-inch Class 1, 50 mV/Pa pre-polarised back electret
CEL-252 ½-inch Class 2, 30 mV/Pa pre-polarised back electret
Microphones use a separate pre-amplifier CEL-495.
-MIC1 High-range ¼-inch microphone, 2.8 mV/Pa pre polarised
back electret.
-MPA1 ½-inch to ¼-inch adaptor
6.19 Calibration
Auto-calibration by application of a 1 kHz calibrator tone, nominal level 114 dB
or 94 dB ±1 dB.
Auto-calibrated to a user-specified reference level with recording of date, time
and offset.
6.20 Power supply
External DC Optional -PC18 12 V DC universal power supply adaptor
available from Casella CEL.
Supply voltage 12 V DC
Supply current 170 mA continuous rating
2.1 mm power connector
Batteries Three AA alkaline or rechargeable cells.
Battery life Typically better than 8 hours in broadband mode with
backlight continuously on at low intensity. High levels of
backlight intensity reduce the battery life.
Typically 12 hours measurement time with backlight OFF.
6.21 Internal clock
Date and time accuracy better than ±2 seconds per day.
6.22 Languages
English (default) English (US) (date/time format) Spanish
French German Italian Portuguese
Chinese Brazilian Portuguese