IPC610D中的叙述是0.3V. 很多工厂都是控制在AC 0.3v以内。
Current research indicates that voltages and spikes less than
0.5 volt are acceptable. However, an increasing number of
extremely sensitive components require that soldering irons,
solder extractors, test instruments and other equipment must
never generate spikes greater than 0.3 volt.