DTZ3m is small, lightweight and portable digital testing equipment primarily designed for testing high voltage protection pin type RIYn. These protections are used in conjunction with Auto-reclosery. Therefore, they are installed outside the building firm and hence the possibility of using AC power 230V ~. These facts are adapted to output parameters of the tester (it is a source of voltage and current in the range 0-10V ~ / ~ 0 to 100 mA), and its power supply (12-35 V DC). The setting range of output values, however, be used to test the device and other devices.