HT Multifunction Tester M74 is a device for safety tests according to IEC/EN61557-1 with TRMS multimeter functions.
The M74 measures Overall earth resistance, tripping time of RCDs type AC, Insulation and Continuity of earth, and equipotential conductors according to the laws in force in private electric installations.
In order to make it versatile and fully functional for any kind of end-user, the device has been provided with the innovative AUTO: function: by selecting this function and only setting the value of RCD current, M74, connected to a power outlet, carries out tests of overall earth resistance, RCD tests and insulation tests in a sequence. At the end of the test, the device shows all results with the indication of compliance or non-compliance with the standards with simple symbols OK or NOT OK.
The M74 has many additional functions such as measurement of phase sequence with 1 terminal, measurement of leakage currents with optional clamp transducer, and a powerful multimeter function for measuring voltage and current’s true root mean square value TRMS.