3M eg4, eg3 user manual Views on Explanation, Dosimeter views and definitions

19

Views on the Edge

Definitions of data log values and views

To set up the Edge and work with noise-level data, you will want to have a good understanding of the terms listed in Table 3-1.

NOTE: The following table is based on A-weighted, slow measurements. Thus, if you choose A or C-weighted with Fast or Slow response the measurement values will change on the display (i.e., you selected sound pressure level with C-weighting with Fast response, it will display as LCF.) For further details, please see “Dosimeter measurement descriptors/variants” in Table 3-2.

Views on the		Explanation
EDGE
LAS		Sound pressure level - is the basic measure of noise loudness,
		expressed in decibels. (In DMS this is noted as “SPL”)
LASMX		Maximum sound level- is the highest sound level recorded during a
		measurement interval with a particular response setting (Slow or Fast) and
		weighting (A or C). LMax is the highest value that is included in LAvg or
		dose calculations.
		Under OSHA regulations, unprotected workers may not be exposed to
		maximum sound levels greater than 115 dB, measured with a Slow
		response rate.
LCPK		Peak Level - is the highest instantaneous sound pressure level recorded
		during a measurement interval. Unlike the maximum level, the peak is
		detected independently of dosimeter settings for response rate or
		weighting.
		Under OSHA regulations, unprotected workers may not be exposed to
		peak sound levels greater than 140 dB.
LASMN		Minimum sound level - The lowest sampled sound level during the
		measurement interval allowing for the unit’s Response Time setting (Fast
		or Slow).
LAVG		Average sound level - (in dB) computed for a chosen time duration,
		based on a 4, 5, or 6 dB exchange rate. LAVG with a 3 dB exchange rate is
		referred to as LEQ (equivalent sound level). All sound levels at or above
		the threshold level are averaged into the calculations relating to noise
		exposure. LAVG is typically calculated with no threshold, with a threshold of
		80 dB or with a threshold of 90 dB.
	Table 3-1: Dosimeter views and definitions

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