measurement of interfering voltage - 1-50 VDC / VAC;
measurement of interfering current - 20 mA - 2A;
measurement of interfering frequencies - 16 Hz - 400 Hz;
measuring of soil resistivity - 0.02 Ohm * m - 1000 Kohm * m;
RK (bu wire compensation) - 0.02 Ohm - 30 Ohm;
test for continuity of the chain <= 250 mA;
test voltages - 20 VAC / 48 VAC;
test frequencies - 94 Hz / 105 Hz / 111 Hz / 128 Hz / AFCAutomatic frequency control (AFC) is used to indentify interference frequency and select the proper one to reduce the influence of Interference voltage.