VC4105A Earth Resistance Tester:Measuring
7-1、Batteries installed and power on, if no batteries symbol display on screen, means power feed not enough, if screen icker or low power indicate, please replace the batteries as instruction.
7-2、Make sure testing leads fully insert into the testing terminal before measuring, otherwise,measuring results will be inaccuracy.
7-3、Potential dangerous: For earth resistance test, terminals between E-C or E-P may generate max.50V AC voltage, please do not make any contact with the testing leads, avoiding electric shock.
7-3-1、Conventional method of earth resistance measuring
1) Testing wire connected as illustration, dive the assisted steel chisel Cand P into the ground,5-10 meters away from the tested target,then, connect the green wire to terminal E, then yellow one to terminal P and the Red one to terminal C.
Notice: The assisted steel chiselshould be inserted into land with high moisture content, if tested in dry land, silicon or gravel ground, add water to keep it wet;
Please water the ground steel chiseland cover with wet towel when it comes to concrete land.
2) Earth voltage measuring
Set the measuring range to EARTH VOLTAGE rst.
While voltage value displayed, earth voltage exits,check if the value below 10 V, if not, results(value)difference may occur in earth resistance testing,cutoff the tested ground system, avale the voltage before re-testing.
3) Earth resistance measuring
Begin with the 2000Ω range，press “TEST”,testing processing with backlight indicates. If value being toosmall, then change measuring range to 200 Ω,20Ωin turns, till you get a reasonable nal result.
Notice: If screen display”l”, means impedance of terminal C resisted ground steel chisel too large.
Check over the connected wire loose or not, or increase humidity of the land to decrease the impedance.
Attention: Make sure all connecting wire seperated from each other, or else, intertwined wire may generate induction; Besides,difference may occur if earth impedance too large, please ensure ground steel chisel Cand P drived into wet land and connected well.