During an ESD event, both D1 and D2 can conduct, but the voltage at VIN exceeds the power-supply-rail voltage by only two forward-biased diodevoltage drops.
To design and manufacture a constant-source with adjustable amplitude value and the test system, and to realize the examination of zener diodevoltage drift parameter, is very important.
设计制作出一个幅值可调的恒流源及其测试系统，实现稳压二极管电压漂移参数的检测，至关重要。
3
The Source-Measure Unit can also test other diode parameters, including forward voltage drop and breakdown voltage.