WM 694 - Wärmewiderstandsmessgerät
- Schnelle und reproduzierbare Messung von R**TH** and Z**TH** in Produktion und Qualitätssicherung
- Ermitteln von Bauteileigenschaften in Entwicklung und Anwendung
Features
- Laststromregelung 1A bis 100A
- Steuerung der Kollektorspannung **VCE** (**VDS**) bis 15 V
- Messmethoden gemäß MIL STD 750E für Dioden, NPN- Bipolar- Transistoren, N-MOS-FETs und IGBTs
- Geeignet für Kurzzeit-Messungen ZTH (ab 2 ms) sowie Langzeit-Tests RTH (10 s und länger)
- Manueller und ferngesteuerter Betrieb über serielle Schnittstelle möglich
- SPS- Schnittstelle
Description
The measuring instrument WM 694 realises the measurement of the thermal resistance of power semiconductors.
The measurement of the temperature increase in a pn- junction is enabled by the relatively defined temperature behaviour of the forward voltage at small current density. This temperature coefficient is typically in a range of -2mV/K and the variance is small for samples taken from the same production run.
Measuring before and after a power pulse the temperature increase is measurable.
These results are used to calculate RTH or ZTH.
The test system is controlled by a microprocessor situated within the measurement unit. All test parameters, actual test methods and results are transmitted via serial interface to the operating PC.