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20
Applications
If the top is at the left of the screen, the angle is in the second quadrant
(180°-30° - 150°) or in the third quadrant (180 + 30° = 210°). For
determination of the quadrant proceed as follows:
- Include a circuit as shown in Fig. 8 into the lead to the X amplifier with
closed switch.
- Open the switch and turn the potentiometer from minimum to maxi-
mum value. In doing so, the shape of the ellipse must clearly change.
PEM 289
E127
Fig. 8. Network for quadrant determination
Phase angle (thus also a)
Quadrant
becomes
Quadrant
larger
smaller
2. (90°-I80°)
3. (180°-270°)
1. (0°-90°)
4. (270°-360°)
If the picture appears as a straight diagonal on the screen, the phase
angle is 0° (360°) or 180° (Fig. 9).
y=0°(360°)
¥> =90°(270°)
PEM2M
Fig. 9. Some particular phase angles
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