The lower impedance of series-wound armatures (example: traction motors, transit and lift truck armatures) makes accurate Surge tests of these coils difficult. To achieve sufficient voltage differences between adjacent bars, standard surge testers use excessive voltage which may harm the windings.

Our 7010K Surge Tester allows you to safely test these coils using higher currents. When testing these coils a specific voltage is applied on adjacent commutator bars reducing the need for excessively high voltage and the danger of damage to the coil. Inter-bar voltages can be varied from 50 to 900 volts on large, cross-connected equalized armatures.

This bar-to-bar testing is the preferred method of testing DC armatures used by manufacturers and re-builders.