VIDAR Megger (programma) Vacuum Interrupter Tester Repaired by Dynamics Circuit (S) Pte. Ltd. The VIDAR vacuum tester is used to test the ability of the VI in a vacuum circuit to inhibit flashover. The rugged, lightweight, compact and portable VIDAR is ideal for field work and shop floor applications. • Tests the integrity of vacuum interrupters quickly, safely and easily • User defined voltage selection • Extensive voltage range • Easy to operate. Follows ANSI/IEEE standardized DC test methods