Castle group dBAir, Руководство по эксплуатации

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Settings
Adjust setting values to determine how the assumed protection value is calculated.
HSE Correction
The UK Health & Safety Executive recommend that a ‘Real World’ derating factor is
used when calculating protection levels.
It is highly recommended that in the UK this derating factor is applied by sel4dB.
The available options for HSE correction are as follows: -
•
Off, +4dB
Standard Deviation
Hearing protector manufacturers provide a standard deviation figure for each
particular model of which is subtracted from the mean attenuation also given.
Different countries may require the use of 1 or 2 standard deviations, for the UK it is
highly recommended that 1 standard deviation is applied.
The standard deviation is a statistical method for correcting errors in the test results
for the performance of the hearing protector. Subtracting 2 standard deviations gives
a more conservative estimate of the real-world performance of the hearing protector.
In the UK, the HSE recommend subtracting 1 standard deviation but then applying a
+4dB derating factor to allow for real-world errors.
The available options for Standard Deviation are as follows: -
•
Off, 1, 2