26
JFETs
• If BAD lights when you test a JFET, it is
because the JFET failed the MOSFET or
IGBT tests. The tester will not detect a JFET
that is actually shorted.
• An open JFET will register as bad during the
bipolar checks.
• A MOSFET with a protection diode might reg-
ister as a bipolar transistor.
MOSFETs
• Since some MOSFETs can conduct in both
directions at very low currents and voltages,
the tester might show that this type of MOS-
FET is bad and shorted.
22-330.fm Page 26 Friday, August 6, 1999 12:34 PM
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