DM 678 - Durchlassmessgerät
- Messplatz für die Bauteilprüfung in Produktion und Qualitätssicherung
- Ermittlung von Bauteileigenschaften in der Entwicklung
Features
- Prüfströme bis 2 kA bei einer Impulsdauer von 500 bis 2000 µs
- Messmethoden für Dioden, Bipolar- und NPN-Transistoren, IGBT und N-MOS-FETs
- 16 Kanäle jeweils mit FORCE-, SENSE-, Hilfsemitter- und 2-fach GATE- Anschlüssen
- Schaltfunktion des Hauptanschlusses über Relaismatrix mit Pneumatiksteuerung
- Lebensdauerüberwachung und Selbsttestprogramm der Relais
- Integrierte Messstromquelle 1 bis 2.000 mA
Description
The DM 678 is a combination of a forward voltage tester and a multiplexer and was developed for measuring the forward voltage in power semiconductor modules with up to 16 power connections.
In conjunction with other measuring devices and generators (BVM 625, LVM 625, ZEH 634), a complete static measuring system for semiconductor modules in a range of 3,000 V / 2,000V can be set up.
The measuring device has been designed for integration within a fully automatic test system thus operation and control of the DM 678 is made via serial interface.
To determine the forward voltage of semiconductors an impulse power source for test currents up to 2,000 A is available. The test current is taken from the capacitor bank within the unit.
During a measurement, the voltage drop across the high power relays of the multiplexer are monitored.
To handle the multiplexer several commands are available for the setting of relays as well as for implementing contact tests, resistance and voltage measure-ments.
The switching matrix consists of a 16-channel (pneumatically controlled) power area and a 4 x 16-channel low power area and can be fully automatically checked for service purposes.