Casella CEL CEL-450 - Manual (Page 12)

2. Press to switch the instrument OFF when all measurement,
setup and data recall operations are finished.
1.5 Description
Both the CEL-450 and CEL-490 Sound Level Meters make use of recent
developments in digital processors to feature a full 0 - 140 dB dynamic
range on a single uninterrupted scale. In addition, the narrow band
versions of these instruments offer real time frequency analysis.
Versions of these instruments are available with Class 1 or
Class 2 measurement accuracy to give an ability to make comprehensive
sound level measurements.
The main
difference between the
CEL-450 and CEL-490 are
the additional timing
facilities included in the
CEL-490. The CEL-450 is
intended primarily to make
the noise measurements required for Industrial Hygiene and Health &
Safety standards, while the more comprehensive timing features of the
CEL-490 make it more suited to the monitoring of Environmental noise.
Versions of both instruments are available for broadband
measurement, broadband plus octave band, and broadband, octave band
and third-octave band measurement. All frequency bands operate in real
time, using Class 0 filters.
To simplify
operation, frequently used
measurement setups can
be stored for re-use. The
setup memory can
accommodate one factory
setup and up to four user
specified setups for each
bandwidth.
Class 1 and Class 2 Measurement.
Broadband, Octave Band and Third Octave
Band versions.
Simultaneous measurement of up to 16
parameters in broadband mode.
Simultaneous measurement of up to 10
parameters in narrow band mode.
Quick Edit function for immediate parameter
change.
One factory setup and up to four user
specified setups stored for each bandwidth.
Up to four profiles can be attached to each
measurement.
CEL-450 CEL-490
Cumulative Measurement x x
Profile Measurement x x
Period Measurement x
Duration Timers x x
Delay Timers x
Ln% Measurement x
Introduction
Page 12 - CEL-450/490 Operators Handbook