Measuring rang and error( under the condition of 23+5c rang earth resistance 0_200v / accurancy +2%rdg+5dgt/ resolution 0.1v
earth resistance rang 20/ 0_19.99/ accurancy + 2.0%rdg +0.1/ resultion 0.01, rang
200/ 20_199.9 / accurancy +2.0%dg +3drg/ resolution 0.1/ rang 2000/ 200_1999/ +2.0%rdg+3drg/ 1
(2) resistance time
measure earth resistance : about 5seconds measure earth voltage : about 2second
(3) resistance voltage:( wire to the housing ) 1500v ac 1 minute
(4) overload proctection
earth resistance rang 200v Ac. (10 seconds) earth voltage range 300v Ac (30 seconds) etc.