11-2 Metrics Logged Model 831 Manual
Acoustical Metrics
Time Interval Values
These are integrated (L
eq
), maximum (L
peak
, L
Smax
, L
Fmax
,
L
Imax
) and minimum (L
Smin
, L
Fmin
, L
Imin
) values evaluated
for the time interval since the preceding sample. Separate
values are determined for A, C and Z frequency weightings.
LAeq, LApeak, L
ASmax
, L
AFmax
, L
AImax
, L
ASmin
, L
AFmin
,
L
AImin
L
Ceq
, L
Cpeak
, L
CSmax
, L
CFmax
, L
CImax
, L
CSmin
, L
CFmin
,
L
CImin
L
Zeq
, L
Zpeak
, L
ZSmax
, L
ZFmax
, L
ZImax
, L
ZSmin
, L
ZFmin
,
L
ZImin
Instantaneous Values
These are continuously varying sound levels, based on Slow
(S), Fast (F) and Impulse (I) detectors and A, C and Z
frequency weighting, measured at the each time interval.
L
AS
, L
AF
, L
AI
L
CS
, L
CF
, L
CI
L
ZS
, L
ZF
, L
ZI
Specialized Acoustic Metrics
L
AFTtm5
: Taktmaximal 5 (utilized in Germany) using A-
weighting and Fast detector. This also requires selection
from the Preferences page, "Takt Maximal Data” on
page 18-14. The definition is shown in "Taktmaximal-5" on
page D-21.
C-A weighted average level (LCeq-LAeq) and
Impulsivity (LAIeq-LAeq).
The optional firmware 831-IH is
required for these metrics to be
measured.
L
twa1
and L
twa2
: time-weighted averages associated with
Dose 1 and Dose 2 exchange rates and thresholds. See
"Dosimeter 1 and 2” on page 9-6.
Increased Time Resolution
Tms Resolution
When the time history interval has been selected to be 500
ms or less, the user has the option of implementing increased
time resolution, which will cause the time value to be
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