What's the use of a voltage tester

The ripple current tester is to conduct online simulation tests on "electrolytic capacitors", "metal film capacitors" and "plastic capacitors" (that is, not only a DC bias is applied to both ends of the capacitor, but also an arbitrary set of AC ripple voltage is applied at the same time) To understand the dynamic life of the capacitor.The outstanding features of this (HG) series ripple current tester are: Compared with other ripple current testers of the same type, its output positive ripple voltage is more standard, less clutter, and smoother; it has an interface alarmIndication and fault indication, the maintenance of the entire instrument is simpler and clearer; it also has a protection function that automatically cuts off the ripple current from an external short circuit, which better protects the safety of the instrument and the operator