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8808A
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Abbildung A-3. Nebenschlussmethode der Kleinsignalmessung
Eine weitere Methode der Kleinsignalmessung ist die in Abbildung A-4 dargestellte
Rückkopplungswiderstandmethode. Der Rückkopplungswiderstand konvertiert den zu
messenden Strom in eine Spannung. Der Operationsverstärker mit hoher Verstärkung
zwingt die Bürdespannung fast gegen 0 Volt und verringert damit den mit der einfachen
Nebenschlusswiderstands-Messung einhergehenden Fehler. Die im Messgerät
verwendete Null-Bürdenspannungsmessmethode ermöglicht eine präzisere Messung von
Kleinsignalen (Kriechstrom).
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Abbildung A-4. Null-Bürdenspannung-Kleinsignalmessung
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