Hitachi IGBT Module Application Manual
Device Check Method
To check IGBT electrical characteristics, a "Curve Tracer" is generally used to measure voltage and
current. Figure 61 shows both good and bad sample examples for checking IGBT module characteristics.
Figure 61. Curve Tracer-based IGBT module Checking
In the above Figure, an AC measurement mode of Curve Tracer is
used. You may wish to use DC mode to make it easier to observe
leakage failure due to the low displacement current.