Tektronix 1760 Uživatelský manuál stáhnout pdf (Strana 115)

Basic Measurements

1760 Series Component Waveform/Vector Monitor User Manual

4-15

Making Audio Measurements

An audio signal with no phase error appears as a straight l ine

extending from t he audio box in the upper right corner of the

graticule to the box in the lower left. A signal with phase

error appears as a n opening in a Lissajous waveform.

Figure 4-13 shows three audio input signals that are equal in

amplitude, but have different phase relationships.

Audio gain is set from the

GAIN MENU when AUDIO display is

selected. Gainchoicesare0dBu,4dBu,8dBu,or12dBu.

Select gain relative to the system under test.

a. Correct Phase

b. Phase Error of 180°

c. Phase Error of approximately 30°

Figure 4-13. Audio displays.

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 179 180

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Tektronix 1760 Uživatelský manuál Strana 115