Meyer Sound SIM 3 Guía de usuario descargar pdf (Pagina 91)

CHAPTER 5

The Measurements

CHAPTER 5: THE MEASUREMENTS — DEFINITIONS AND

APPLICATION

SIM 3 performs four basic types of measurements:

■ Band Spectrum — rms signal amplitude in 1/3-octave bands.

■ Line Spectrum — rms signal amplitude at 48 points per octave.

■ Delay Finder —time domain information between two measurement points.

■ Frequency Response — differences in amplitude and phase by frequency between two

measurement points.

Each measurement is described below.

NOTE: For all views, use the [+] and [–] keys in the Meters tab to properly

adjust the level for live measurements (see section 6.7, Meters Tab).

NOTE: Use the [+] and [–] and arrow keys at the lower left bottom of the mea-

surement screen or View > Horizontal Zoom to view zoomed sections of the

spectrum. In Delay Finder, use View > Horizontal Zoom or the [+] and [–] buttons

centered under the graph.

5.1. BAND SPECTRUM

5.1.1. Overview

Spectrum measurements display the single-channel amplitude response of each of the mea-

sured input channels as absolute rms amplitude dBV (or dBSPL for the Mic channel) versus

frequency in Hertz. Band Spectrum shows the amplitude in 1/3 octave bands.

5.1.2. Description of the Measurement

Band Spectrum integrates the energy within each 1/3-octave band of frequencies in the

tested signal, and presents each one as a single horizontal line representing the total energy

in that band. The view can either be as a segmented line, with each segment representing

1/3 octave, or as a series of vertical bars by selecting View > Band Spectrum Solid.

The 1/3-octave, ANSI-standard Band Spectrum measurement is useful for verifying signal

presence in each measurement channel and the frequency content of the signal at each

1 2 ... 86 87 88 89 90 91 92 93 94 95 96 ... 231 232

Sin comentarios

Meyer Sound SIM 3 Guía de usuario Pagina 91