| 摘要 |
PURPOSE:To improve measurement precision sufficiently even when a collector current Ic is reduced by providing a resistor loop pattern around the active element of HIC, conducting when transient resistance is measured, and finding a fine emitter-base voltage DELTAVBE1 before and after the conduction. CONSTITUTION:The resistor loop pattern 8 which starts and ends at nearby terminals 6 and 7 is formed at the blank circumference of a power transistor (TR) pellet 4. Power TR driving terminals 9, 9, and 9 of the HIC are connected to a measuring circuit and an SW is turned on to conduct a fairly small amount of a collector current Ic by adjusting a variable resistor. The resistor loop pattern 8 is heated at the same time, so the power TR pellet 4 is driven in a thermally stable state regardless of the fairly small amount of the conduction current Ic and DELTAVEB1 is measured accurately, to measure the heat resistance. |
