Casella USA CEL 240 Series Benutzerhandbuch - Seite 5
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Auch für Casella USA CEL 240 Series: Handbuch für häufig gestellte Fragen (6 seiten)
Seite drucken6. Maximum decibel level
7. Instrument settings
8. Reset
Preparation for Use
Install three AA Alkaline (or NiMH) batteries observing polarity (Figure B).
Always replace batteries when the battery indicator (Figure D.1) shows the batteries are
low to prevent the CEL-240 switching off during monitoring.
The CEL-240 is now ready for operation.
General Operation
1. Switch on by pressing the power button (Figure A.2). The instrument displays the
firmware version (e.g. v1.01) and serial number (e.g. 0108121) followed by the
main measurement screen (Figure D).
2. Calibrate the instrument as required. See 'Calibration' section.
3. Place the windshield over the microphone prior to any measurement.
4. The CEL-240 will display a bargraph (Figure D) or time history (Figure J)
display. See 'Instrument Settings' to change time and frequency weightings, or
type of display.
5. Instantaneous and maximum sound pressure levels are displayed on the
measurement screen with the relevant time and frequency weighting. The
maximum sound pressure level can be reset by pressing the right key
time.
6. Once measurements are complete, switch off the instrument by holding down the
power key (Figure A.2). The power key needs to be held down for 3 seconds to
prevent accidental switch off.
Calibration
It is recommended that an acoustic calibration is performed using a CEL-110/2 or CEL-
110/1 calibrator before and after measurements as follows:- Switch on the acoustic
calibrator (refer to calibrator instruction manual). If the calibrator has 114dB output,
ensure the CEL-240 is set to the 60-130dB range.
microphone.
The CEL-240 automatically detects a 1KHz tone from a 94 or 114dB calibrator and
enters calibration mode (Figure E). Press left key
key
to exit. Upon successful calibration, the screen will be as in Figure F.
Instrument Settings
Figure K:
Power off screen
Place calibrator firmly over the
to perform a calibration or right
at any