Very Low Frequency Tester for High Voltage Cable 80KV 1.Pure sine wave output 2.suitable for testing ... parameters:1. Output voltage ratings: 30KV, 40KV, 50KV, 60KV, 70KV, 80kV (peak)2. Output frequency: 0.1Hz, 0.05Hz, 0.02Hz3 ... AC50Hz, 220V +-5%8. Power supply fuse tube: 10AWhat is VLF?VLF means 'Very Low Frequency' and 0.1Hz to 0.02Hz ... 3925+4512A Very Low Frequency Tester for High Voltage Cable 80KV