A solid state high frequency tester

Although it has been in use for many years, high frequency testing to establish the integrity of coil insulation remains superior to any other known technique. The use of solid-state switching devices to replace the spark gap used by Rylander, and the use of an oscilloscope display in place of his wavemeter have improved considerably the accuracy and reproducibility of the test, and made it more simple and fast. In addition, the procedure of discharging into two parallel coils and displaying the differential current signal has increased the sensitivity of the test. Because it is easily wheeled from place to place, this tester provides a degree of flexibility not available heretofore. For these reasons, the use of this type of apparatus for coil testing should increase markedly in the near future.