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GMC-I Messtechnik GmbH 39
Metingen V/Hz – R
SL
– Temp – – m – M
ISO
– A/Hz
5.8 Isolatieweerstandsmeting op telecommunicatie-inrichtingen –
functie M
ISO
.
Voor metingen aan symmetrische koperkabelinstallaties met twee lei-
dingen en afscherming zijn er 3 stekkerbussen a, b en E. Door de
draaiknop om te draaien kunt u kiezen of de isolatietest tussen
a-b, a-E of b-E verricht moet worden.
Een eenaderige onderbreking resp. het contact met een ongescha-
kelde ader (capacitieve asymmetrie) kan worden herkend door
snel te wisselen met de knop POL / U
ISO.
Bij een goede leiding moet de bargraph in de schakelaarstanden a-
E en b-E even groot zijn (alleen bij ongeschakelde leidingen!).
lange kabel – grote bargraph
kort kabel – kleine bargraph
De totale lengte van een bargraph is gelijk aan een capaciteit van
50 nF 100 nF.
COM mA A
V
Temp
aEb
0V !
!
10.38
F
+
+
Meetbereik: 10 pF ... 300 F
3,100 km / 31,000 km
Meetbereiken:
COM mA A
V
Temp
aEb
m
15.00
m
m
k
FUNC
ENTER
5 Bereiken: 30 nF / 300 nF/
3 F / 30 F / 300 F
39


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