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80 Series V
Bedienungshandbuch
20
Gebrauch von Leitfähigkeit für hochohmige
Prüfungen oder Leckstromprüfungen
Leitfähigkeit, die Umkehrfunktion von Widerstand, ist die
Fähigkeit eines Schaltkreises, Strom zu leiten. Hohe
Werte von Leitfähigkeit (Leitwerte) deuten auf
niedrige Werte von Widerstand.
Der 60 nS-Bereich des Messgeräts misst die Leitfähigkeit
in Nanosiemens (1 nS = 0,000000001 Siemens). Da
diese geringen Leitfähigkeitswerte hohen Widerstands-
werten entsprechen, kann mit dem nS-Bereich des
Messgeräts der Widerstand von Bauteilen bis zu
100,000 MΩ, 1/1 nS = 1.000 MΩ gemessen werden.
Zum Messen von Leitfähigkeit das Messgerät wie zum
Messen von Widerstand in Abbildung 5 gezeigt ein-
richten; dann C drücken, bis der Anzeiger nS in der
Anzeige erscheint.
Ratschläge zum Messen von Leitfähigkeit:
Messungen in hochohmigen Schaltkreisen sind
anfällig für induzierte elektrische Störungen. Um die
Mehrheit der Rauschwerte zu glätten, in den Modus
MIN-MAX-Aufzeichnung schalten und dann den
Mittelwert (AVG) der Messung bestimmen.
Normalerweise gibt es bei offenen Messleitungen
einen Restleitwert. Genaue Ablesungen können im
Relativmodus (REL) durchgeführt werden, indem
die Restleitfähigkeit abgezogen wird.
28


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