The DW series impulse winding tester tests electrical characteristics of coil windings without giving damage to the samples.  The master coil and a test coil are supplied with the same electric impulse by capacitor discharge, and voltage decay waves generated by these coils in response to the impulse are displayed on the CRT screen.  By comparing the test piece's wave to that of the master's, the defective coil can be found at a glance.   Our DW tester can test various types of motors, transformers, relays and other types of coils.  With digital and micro-computer technology, DW-9501/9505 is a versatile testing equipment for production line and for laboratory use.