... 2,Unlike DC test, 0.1HZ Digital Very-low-Frequency High Voltage TesterThe new generation of AC ... capacity equipments such as generator, cable, insulator, power capacitor, large transformer etc. Not only can it be ... and outdoor testing, but also as the ultra-low frequency source.Advantage of 0.1Hz SVLF series1 ... 1/500 of power Frequency.2. AC ultra-low frequency tester doesn’t form tree-clearance in ...