Knowledge 
What is VLF?
Release Time : 2020-12-31 View Count : 次VLF stands for Very Low Frequency. VLF is generally considered to be 0.1 Hz and lower. Many people assign too much mystery to VLF testing. A VLF hipot, and VLF testing, is very simple. It’s just an AC hipot but with a lower frequency output. We have all used AC hipots for decades to test various types of equipment. Now they can be used for field testing cable and rotating machinery.
