3M SE, DL user manual Virtual meters, Measurement notation IEC/ISO, Meter 1/Meter 2 explained

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Virtual meters	CHAPTER
	5
Meter 1/Meter 2 explained

Preparing to measure & running

This chapter explains the steps needed to prepare the SoundPro for measuring and how to run measurements. It will also show you sample measurement result screens and explain the contents of the screens.

Virtual meters

SoundPro SE/DL operates with two parallel measurement systems called meters. Each meter obtains the same input from the microphone, processes the information through the same SoundPro SE/DL circuits and displays the measurement results in the same screens. The differences lie in the parameters used by each meter to process the signals. You can get different measurement results by setting the parameters for each meter differently.

Meter 1/Meter 2 explained

Meter 1 and Meter 2 enables you to setup and monitor two instruments in one (also referred to as a “virtual instrument”). “Meter 1” is the primary meter. “Meter 2” is the secondary meter. If a filter option is installed in the instrument, the filtered measurements are associated with “Meter 1” only. Setting Meter 1/Meter 2 Parameters are explained in Chapter 3. (See Figure 3-4 for a screen example.)

Measurement notation (IEC/ISO)

Many of the instrument’s measurements are labeled in accordance with nota- tion standardized jointly by the International Electrotechnical Commission (IEC) and the International Standards Organization (ISO). This notation iden- tifies the measurement and the meter’s frequency and time response settings when the measurement was obtained. Table 5-1 provides a couple measurement examples. For additional information about measurements and measurement parameters, see Appendix B, “Glossary.”

Notation	Explanations
LCS	SPL measured with C-weighting and slow response.
LCSav	Average SPL with C-weighting and slow response.
LAPk	Peak SPL with A-weighting
LCSMx	Maximum SPL with C-weighting and slow response.
LCSMn	Minimum SPL with C-weighting and slow response.

Table 5-1: Measurement notations

Models SE and DL