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.
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.
|AUTO test (Non-trip ground resistance, RCD, Insulation) in sequence|
|Insulation with voltage 50, 100, 250, 500, 1000VDC||250V, 500V|
|Continuity of protective conductors with 200mA|
|Tripping time and current of RCDs type B, A, AC Standard, Selective and Delayed up to 1A||A = 30mA - AC = 300mA only general|
|Non-trip earth resistance|
|Leakage current with optional clamp meter|
|Protection category||CAT III 550V|
|DC/AC TRMS voltage and current, Frequency, Resistance, Continuity with buzzer|
|Size (LxWx H) (mm)||240x100x45|
|Weight in grams (batteries included)||450|