Casella CEL CEL-63X - Manual (Page 22)

CEL-63x Environmental & Occupational Noise Meter
22 Casella CEL
The cumulative data set alone does not provide time history
information. To include time history information for the
measurement, you can enable Profile recording.
Profile recording
A profile recording consists of a series
of fast measurements made at the
same time as a cumulative
measurement.
The profile recording supports a more limited set of functions, including L
Aeq
,
L
AIeq
, L
Cpk
, L
AFmax
, L
ASmax
, L
AImax
, and optional Ln% statistics (Broadband Fast
A-weighted Lns only).
When you use profile recording, you can set the interval of each of the profile
measurements to one of the following:
OFF
100ms, 1, 2, 5, 10, 15, 20, 30 or 60 seconds
2, 5, 10, 15, 20, 30 or 60 minutes
NOTE
When used with periodic recording, the profile interval can only be set to a sub-
interval of the cumulative measurement duration to produce an exact number of
profile samples per period.
Periodic measurements
Periodic measurements allow the total measurement duration to
be divided into separate fixed time intervals. In Periodic mode, a
full set of results is stored at the end of each time interval,
whereas in Cumulative mode a single full set of results is stored
at the end of the measurement run.
In effect, the original full set of cumulative results is captured at periodic
measurement intervals.
Figure 9. Repeating cumulative and profile data sets