The MIG 14403 is an insulation tester that uses an 1.2/50 µs impulse for the telecom lines. This unit is fitted with 2 outputs that deal with 48 and 500 Ohm. The 48 Ohm rated output has a maximum current rating of 3000 A and a voltage rating of 144 kV. The 500 Ohm rated output has a maximum current rating of 288 A and a voltage rating of 144 kV.