Casella CEL CEL-281 - Manual (Page 33)

1 min. L eq : L AVG with Q = 3 taken over a 1 minute
sampling period,
10 s L eq : L AVG with Q = 3 taken over a 10 second
sampling period,
1 s L eq : L AVG with Q = 3 taken over a 1 second
sampling period,
Sound pressure level with fast time weighting,
Sound pressure level with slow time weighting.
Each of these histograms can be displayed in terms of probability% or cu-
mulative%.
2.2.9 Profiles
A noise Profile is a simple record of a series of noise samples taken at
regular intervals as shown in Figure 4. The samples may be measured
levels, or calculated parameters.
In the CEL-281, the following eight parameters are stored as profiles.
1 min. L eq L AVG with exchange rate Q = 3
taken over a 1 minute sampling period,
1 min. fast max: Maximum SPL taken over a 1 minute
sampling period with fast response,
Time
Level
dB
Noise samples taken at regular intervals
910007
Figure 4 Typical noise profile
CEL-281 Operator's Handbook - Page 25
_Introduction