| 摘要 |
PURPOSE:To measure breakdown voltage between the collector and the emitter with high accuracy, by connecting a capacitor for opening the base of a transistor to be measured, like a direct current. CONSTITUTION:A switch SW is connected to a contact (a), a designated collector current is applied to transistors Q1, Q2 having a high current amplification factor by means of Darlington connection from a variable voltage source EC, and the collector-emitter voltage in this case is measured by a voltmeter VC. In this case, by a capacitor C0 connected to the measuring circuit, a noise current IN by an inductive noise N flows through the capacitor C0, the bases of the transistors Q1, Q2 and the AC-like ground terminal are selectively short- circuited, the bases of the transistors Q1, Q2 are opened like DC, and the collector-emitter breakdown voltage measured in a state that the base of the transistor has been opened is not dropped by a noise current but is measured with high accuracy. |
