// multi-utility computation suite · offline · instant · precise
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sci.noise-dose-OSHA-exchange-rate Calculator
Calculates OSHA noise dose with 5 dB exchange rate: PEL = 90 dBA for 8 hr; T(L) = 8/2^((L−90)/5) hours. Action level is 85 dBA (50% dose) requiring a hearing conservation programme — OSHA 5 dB exchange rate is less protective than NIOSH's 3 dB rate.
Inputs
L1 Dba
Time for one complete cycle (s). Period = 1 / frequency. A 50 Hz signal has a 20 ms period.
T1 Hr
Length of time the process lasts. Ensure units are consistent with rate inputs.
L2 Dba
Time for one complete cycle (s). Period = 1 / frequency. A 50 Hz signal has a 20 ms period.
T2 Hr
Length of time the process lasts. Ensure units are consistent with rate inputs.
L3 Dba
Time for one complete cycle (s). Period = 1 / frequency. A 50 Hz signal has a 20 ms period.
T3 Hr
Length of time the process lasts. Ensure units are consistent with rate inputs.
Results
noise dose D (%)
Random or irrelevant variation in the measurement.
time-weighted average TWA (dBA)
The arithmetic mean -- sum divided by count.
OSHA Action Level (AL)
The measured or computed level on the applicable scale.
D = Σ(ti/Ti) | T = 8/2^((L−90)/5)
Reference formula or conversion factor shown for context.
NIOSH comparison
Sample size or count used in the calculation.
daily dose limit
Reference formula or conversion factor shown for context.