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Digital multi-meter (DMM) test procedure:

  • Equipment Requirement - DMM with diode check mode and battery voltage less than 20V. (Typical units using 9V battery are OK).
  • Collector-Emitter Junction test:
    1. With the module out of circuit remove the conductive foam and short the gate to emitter.
    2. With DMM in diode check mode, the collector to emitter should give a normal diode reading with positive on the emitter and negative on the collector.
    3. The DMM should read open or infinite with positive on the collector and negative on the emitter. Damaged IGBTs may test as shorted in both positive and negative directions, open in both directions, or resistive in both directions.
  • Gate Oxide test: With the DMM in resistance mode the resistance from gate to collector and gate to emitter should read infinite on a good device. A damaged device may be shorted or have resistive leakage from gate to collector and/or emitter.
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13y ago

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