Casella CEL CEL-63X - Manual (Page 52)

CEL-63x Environmental & Occupational Noise Meter
52 Casella CEL
SPL and L
eq
SPL
The function highlighted in red is the main SPL (instantaneous
sound pressure level) that is currently selected. This is the SPL
value shown on the screens when the instrument is in
Measurement stop or in Measurement run mode.
The functions highlighted in green are the other functions that
are selected for display during a measurement run.
You can select other SPL functions by using the Navigation keys and then press
the Run/Stop key to add the selected function to the user-defined
measurement view.
You can select an SPL function and hold the Run/Stop key pressed for one
second to set the selected function as the main SPL.
You can also select any non-SPL function. Keep the Run/Stop key pressed for
one second to set the selected function as the main run function. This will then
be displayed using a larger font during a run.
The CEL-63x instrument allows you to store statistical information, L
n
, about
the instrument‟s measurements. The recorded L
n
values include A, C and Z
weightings. Refer to Statistical values on page 54 for an explanation of the
statistical functions. The L
n
values are ALWAYS calculated using the Fast octave
time constant.
L
eq
L
eq
is the equivalent continuous sound pressure level. It is an average of the
total sound energy measured over a specified period of time. It represents the
level of a steady, continuous noise that has the same total energy as the real
varying noise measured over the same period.
The functions highlighted in green are the other functions that are selected for
display during a measurement run.
The L
eq
subscript identifies the frequency weighting used when calculating the
L
eq
function, for example L
Ceq
is the C-weighted L
eq
.