Larson Davis Spartan 730, Reference Manual

Page: 94 / 101

730/730-IS Dosimeter Manual B-7
Peak Frequency Weighting
The frequency weighting of the peak detector. Possible selections are A, C, Z. Peak weighting is independent of the
RMS frequency weighting. For additional information, see the entry for “Frequency Weighting” .
Projected Daily Personal Noise Exposure
( P. L
EP, d
or P. L
EX
, 8h ) The Daily Personal Noise Exposure assuming that the current rate of noise dose exposure
continues for the duration of a work shift (Shift Time). For example, a measured L
eq
of 86 dB with a Run Time of 4
hours will produce a L
EP,d
or L
EX
,8h or 83 dB, but a projected P.L
EP,d
or P.L
EX
,8h of 86 dB if the Shift Time is 8 hours. If
the shift time is doubled (16 hours), the P.L
EP,d
or P.L
EX
,8h would become 89 dB.
Projected Noise Dose
Projected Noise Dose is the Noise Dose assuming that the current rate of noise exposure continues for the full
duration of an 8 hour work shift. Displays on the dosimeter LCD as P. Dose.
L
eq
= frequency weighted (A or C), equivalent-continuous sound pressure level in dB
P(t) = instantaneous, frequency weighted (A or C), sound pressure in pascals
P
0
= reference sound pressure, 20 µPa
T
n
= normalization period or Criterion Duration (8 hours)
T
S
= work shift duration, Shift TIme
L
AS
= A-weighting frequency and slow-exponential
weighting time sound level in dB (in the formula
above, if the sound level is less than the user
specified threshold level, then L
AS
= -∞)
L
avg
= average sound level in dB, only recording
values higher than the user specified threshold level
L
C
= Criterion Level in dB
T = measurement period or Run Time (T = T
2
– T
1
)
T
S
= work shift duration, Shift Time
T
C
= Criterion Duration in hours (8 hours)
q = exchange rate constant
• if exchange rate = 3, q = 10
• If exchange rate = 4, q = 4 / log
10
(2) ≈ 13.29
• If exchange rate = 5, q = 5 / log
10
(2) ≈ 16.61
• If exchange rate = 6, q = 20
OR
OR