... -low-Frequency High Voltage Tester 1,Small volume, light weight, easily to operate. 2,Unlike DC test, 0.1HZ Digital Very-low ... speaking, the capacity is of 1/500 of power Frequency.2. AC ultra-low frequency tester doesn’t form tree-clearance ... .Technical parameters:1. Output voltage ratings: 30KV, 40KV,50KV,60KV,70KV, 80kV,90KV2. Output frequency: 0.1Hz, 0.05Hz, 0.02Hz3. Measurement accuracy: 3 ...