Casella CEL CEL-281 - Manual (Page 101)

4. Change the time weighting in use as detailed inSection 4.7.1.
5. Provided the instrument is not logging data, press the key
to change the frequency weighting in use (see Section 4.7.2).
6. While noise dose levels are being displayed, press the key
to display stored average noise levels calculated with the next
from up to four different exchange rate values (Q = 3, 4, 5, and
6).
The value used for the currently displayed noise dose level will
be shown below the main display.
7. While noise dose levels are being displayed, and irrespective of
which Q value and threshold level are in current use, if neces-
sary press the key to show the current criterion level on
the main display.
8. Press the key again (several times) until the required
criterion level is displayed.
A series of up to six different levels can be selected (70 dB,
75 dB, 80 dB, 84 dB, 85 dB,and 90 dB). However only valid
ON RUN
P%Dose
Q=
910036
Figure 16: Typical display showing measurement of projected %dose
Page 92 - CEL-281 Operator's Handbook
Obtaining Required Results_