The quality and performance of various insulations can be tested using the Insulation Tester. The MD- Insulation Tester acquires insulation resistances up to 10 terra ohms. The MI – Insulation Tester offers testing potentials up to 20 kV. The insulation tester is needed for any kind of newly built installation or reconstruction. Insulation testing is for example indispensable in the process of recoiling electromotors. The use of insulation Resistance Testers is also highly recommended for motors with longer running time, in order to better estimate the remaining lifetime. There are also special, sure-footed housings available for the Megohmmeter, in case it needs to be used on rather adverse measuring conditions. The Megohmmeters are equipped with special memory, RS-232 interface, real time clock and printer, for more precise insulation tests and record. In addition to that, Megohmmeters are equipped with an automatic discharge of the dut, e.g for capacitive testees. All Megohmmeters are calibrated from production, and contain, depending on the application, a four-lead measurement possibility for contact control. The mobile insulation resistance tester’s are delivered with all the measuring auxiliary components, such as test leads, clamps, batteries and carrying bag. For the stationary insulation testing device IL3801, the insulation test voltage is generated through a programmable, fully electronic source. Those insulation resistance tester’s contain back-facing terminals, digital I/Os, remote control software , as well as DLL, LAN and USB- Interfaces.