The Gossen M681N is a 2- / 3-channel micro-ohmmeter up to 50 A / 50 V for checking transition, connection and winding resistances on inductors up to 1,500 Henry in the high and medium voltage range as well as continuity and length measurement on cables and cable shields (transformers , Generators, motors). The WR50 was developed for use in the high and medium voltage range. With the powerful supply of 50 A / 50 V and the sophisticated automatic unloading system, the charging and discharging times of inductive test objects are significantly reduced! In addition, the devices contain a demagnetization function, which ensures safe connection to the grid. Example: 200 MVA transformer - measurement duration per phase: 60 seconds! The 3-channel version allows measurements to be carried out even faster than usual. By connecting the primary windings in series, all inductors are charged simultaneously. The resistance is measured separately for each winding. This means that a three-phase unit can be completely measured in 2 measuring steps.