Casella CEL CEL-281 - Manual (Page 56)

grams showing cumulative percent and probability percent are
illustrated in Figure 9.
3.3.8 Profile Key
(beige three-function key: yields profile information)
While in calibration-delay or calibration modes, or when the
display has been switched off, this key will be ignored.
When the instrument is fully operational and the instrument has
been switched off since the distribution area was last in-
spected, pressed alone, this key cancels any other display
mode that has been selected and shows the value stored in
the first (earliest) memory cell of the one minute L
eq profile.
However, if the instrument has not been switched off since the
profile area was last inspected, the previous settings are re-
membered and when the key is pressed, the instrument dis-
plays the same cell and the same parameter of the last profile
inspected: dB level or time.
Then repeatedly pressing the key cycles the display
through the other stored profiles (starting from the same point
in time, i.e the same memory cell) as follows.
1 min. L eq : Identified as L AVG with 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,
1 min. slow max: Maximum SPL taken over a 1 minute
sampling period with slow response,
1 min. imp. max: Maximum SPL taken over a 1 minute
sampling period with impulse response,
10 s fast max: Maximum SPL taken over a 10 second
sampling period with fast response,
How It Works
Page 48 - CEL-281 Operator's Handbook