3M eg4 user manual Definitions of data log values and views, Views on Explanation

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Views on the Edge

Definitions of data log values and views

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
053-644, Rev H			Page 19	eg4