Casella CEL CEL-63X - Manual (Page 53)

CEL-63x Environmental & Occupational Noise Meter
53 Casella CEL
Other functions listed under L
eq
are as follows:
L
AIeq
is an integrating A-weighted measurement of impulse L
eq
.
Integrated measurements provide an L
eq
measurement that assesses
exposure to noise levels, and are used in the calculation of the personal
noise exposure L
EP
as defined by ISO 1999.
L
C
– L
A
is a measurement that is used in the HML method, where
separate values for high, medium and low frequencies provide a better
estimate.
L
AeqT80
is an A-weighted measurement of L
eq
that has a threshold setting
of 80 dB. This is used for ACGIH in the USA only.
Maximum and Minimum SPLs
This screen allows you to select among the available maximum
and minimum SPL functions.
The subscripted letters identify the frequency weighting and the
time constant to be used for the measurement, and whether the
measurement is a maximum or a minimum.
Peaks, L
Avg
and other functions
Peaks
The Peaks functions are L
APk
, L
CPk
and L
ZPk
.
These functions record the peak levels of noise using A, C and Z
weighting.
L
Avg
L
Avg
is the time-averaged noise level with an applied exchange rate, measured
during the run. The two options are to use exchange rates Q5 (5 dB) or Q4
(4 dB).
Other functions
L
AE
is the A-weighted exposure level (previously known as SEL). It is the
sound pressure level that would contain the same amount of energy in
one second that the actual noise has during the whole measurement
period.
L
Tm3
and L
Tm5
functions are Taktmaximal A-weighted fast or impulse
measurements.
Taktmaximal measurements are specified in German noise standards
(the DIN standard). They integrate noise over a 3 second or a 5 second