VLF40 and VLF60 series
Finally: The portable VLF tester for XLPE, PE & EPR Cables VLF tester series allows companies an economic alternative to the DC testing.
What is VLF-testing?
VLF stands for Very Low Frequency and is generally considered to be 0.1 Hz and lower. The HVI VLF AC Hipots output a true sinusoidal AC voltage at 0.1 Hz or lower, rather than at 50 or 60 Hz. It is still AC voltage, only at a lower frequency. HVI VLF units offer frequencies as low as 0.01 Hz.