Measurement-computing eZ-Record rev.2.1 Manual do Utilizador descarregar pdf (Página 38)

eZ-Record Manual January 2001

frequency-domain analysis is built. The cross spectrum is calibrated in units

of (peak EUy) (peak EUx).

Octave: Many sounds, including audible noise for a transmission line, are

broad band, having components that are continuously distributed over a

range of frequencies. The spectrum of such a sound can be approximated in

terms of a series of octave band or one-third octave band pressure levels. A

band is designated by its center frequency, f

, which is the geometric mean of

the upper and lower frequencies of the band. (See ANSI/ASC S1.6-1984.

Activates the Octave Type menu. Select the desired Octave Type on the

Octave Type menu.

Transfer: Activates the Transfer Type menu option. Select the desired

Transfer Type on the Transfer Type menu.

Unaveraged Spectrum: A display function of the magnitude of instantaneous

unaveraged spectrum.

Averaged Time: A single-channel display function. Displays a time domain

waveform of filtered, averaged, sampled data scaled in either Volts or EUs.

Reference Spectrum minus Current Spectrum: Displays the difference

between the Reference Spectrum and the Current Spectrum when

Linear (-), Negative Averaging, is specified.

Windowed Time: Applies to the FFT Response window specified in the

Miscellaneous Tab of the Medallion Configuration window to time data.

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Measurement-computing eZ-Record rev.2.1 Manual do Utilizador Página 38