众所周知,由于晶体管元件物理特性,容易产生热故障。它在常温时工作正常,在较高温度时呈现热故障,这往往给检查带来困难。我们用钳形电流表较快地查出此类故障。 It is well-known that due to the physical characteristics of transistor elements, thermal faults are prone to occur. It works well at room temperature and shows thermal failure at higher temperatures, which often leads to difficulties in inspection. We use a clamp ammeter to detect such faults faster.