CASELLA CEL CEL-62 Series, Operator'S Manual

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MEASUREMENT VIEW .
Predefined views are available to satisfy measurements for international workplace
noise legislation. Use the
Up/Down Cursor Keys (C) to highlight the required view and
press Activate (B) to select the Measurement View. The Measurement View with the
word ‘Active’ next to it will be used for measurement runs. To view the details press
View (B).
On CEL-621 units, two fixed Environmental Views are available which provide additional
statistical parameters (L
n%
) and parameters unique to workplace noise are removed.
USER 1 AND 2 SETTINGS .
Two customisable views are available in which measurement weightings and
parameters can be set. When one of these views is Active by pressing
Activate (B),
press (B) again to edit the view. The Left/Right Cursor Keys are used to make changes
and the Up/Down Cursor Keys are used to move to the next field. On this screen you
can define the following:
RESPONSE (Random/Freefield)
Random microphone response is typically used to conform to US legislation for
workplace noise whereas Freefield is used throughout the EU.
LAVG THRESHOLD (70-90dB)
The threshold is used for the calculation of L
AVG
, which is the level at which all noise
below is ignored. Note with threshold set to zero the threshold is off.
OCTAVE WEIGHTING (A, C or Z)
The frequency weighting used to display 1/1 or 1/3 octave band results. Note that
regardless of the settings selected, Z weighted measurements are stored so the data
can be post-processed on a PC to C or A weighting.
OCTAVE TIME CONST (F or S).
The time weighting used to display 1/1 or 1/3 octave band results. Regardless of the
selection, both time weightings are stored simultaneously for L
MAX
results. Time
weightings of Fast (F) or Slow (S) do not apply to L
eq
measurements.
Press the Run/Stop Key (D) to restore defaults. Press Functions (B) to open the
Functions screens for the selected ‘User 1 View’.
Figure 4 Setting Options (Sheet 1)
Casella CEL 9