3M SE, DL user manual Measurements Explanation, Measures screen explained

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Basic setups

Measurement setup (for community noise)

•CNEL – Press Enter to select data field. Press Enter repeatedly to toggle between On/Off setting.

•Lc-a– Press Enter to select data field. If marked “N/A,” see “C- A measurement settings.”

•TAKTMX ~ Press Enter one or more times to select 3 sec., 5 sec., or Off.

6.To change other measurement settings, repeat steps 4-5.

7.When finished, press On/Off/Esc to exit the screen.

The following table explains your selections in the Measures screen

(Please see Appendix B, Glossary of Terms for more details.)

Measurements Explanation

L1-L4L1-L4 are types of exceedance levels. This is defined as the

(Exceedance) level exceeded by the measured noise level for an identified fraction of time. Exceedance levels may be calculated for many time fractions (or percentages).

		•	Optional Settings: Set to “Off” or to a percentage value of
			your choice (1-99%).
LDN		Representing the Day/Night sound level, this measurement is
		24-hour average sound level where 10 dB is added to all of the
		readings that occur between 10pm to 7am. (Please see
		glossary of terms for more details).
		•	Optional Settings: Set to “Off” or “On”.
CNEL		Community Noise Exposure Level. The accumulated exposure
		to sound measured in 24-hour sampling interval and artificially
		boosted during certain hours.
		Optional Settings: Set to “Off” or “On”.
Lc-a		This measurement (also commonly called C-A measurement) is
		only available under certain conditions. Information about
		viewing and changing these meter settings is discussed under
		the next section, “C-A measurement settings”. Optional
		Settings: Set to “On” and “Off”. See C-A section below for
		parameter settings.
TAKTMX		A time average over a sampling that uses the highest level
		occurring during the preceding Taktmaximal interval (either
		three or five seconds), and assumes it was present for the
		whole Taktmx interval.
		Optional Settings: Set to “Off”, “3sec”, or “5sec”
	Table 3-2: Measures screen explained

Models SE and DL