IBM Car Amplifier 7220 Manual do Utilizador descarregar pdf (Página 68)

5-28

Chapter 5, FRONT PANEL OPERATION

MAG %fs

Figure 5-29, Magnitude Output as % Full-Scale

Shows the signal magnitude, where magnitude = √((X output)

+ Y output)

), as a

percentage of the selected full-scale sensitivity setting. Hence if the sensitivity setting

were 100 mV and a 50 mV signal were applied, regardless of the setting of the

instrument’s reference phase, the display would read 50.00 %

Noise %fs

Figure 5-30, Noise Output as % Full-Scale

Shows the noise accompanying the signal, in a bandwidth defined by the setting of the

output filter time constant, where it is assumed that the noise is Gaussian. The value

is given as a percentage of the instrument’s selected full-scale sensitivity setting. Note

that the displayed value will change as the time constant control is adjusted. The

instrument offers a second Noise output (discussed later in this section), expressed

directly in terms of volts or amps per root Hertz, which takes this effect into account.

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IBM Car Amplifier 7220 Manual do Utilizador Página 68