Zhiwei ZWS480 Digital Earth Resistance Tester (0Q~30000Ω)

Function: Grounding resistance,loop resistance,conduction resistance and equipotential

connection resistance test soil resistivty and AC voltage test

Power: DC 9VZi-Mn dry battery R14S 1.5V 6 PCS,continuous standby for 300 hours )

Back linht: Controllable white screen backlight,suitable for use in darkfield

Testing method: precision 4 wre 3wre testing,simple 2 wire test groundng resistance

Measure method: Earth Resistance:rated current change-pole method,measurement current 20mA Max

                             Soil Resistivity.4-pole measurement (Wenner method)

                              Earth Voltage:average rectification(between P(S)-ES)

Range: 234 wire method for measuring ground resistance (R):0.000Q~30000Ω

             Soil resistivity (p):0.00Qm~9000kQm

              Grounding voltage:AC 0.0~100.0V

Max.resolution: 234 wire method for measuring ground resistance (R):0.0010

                           Soil resistivity (p):0.012m

                           Grounding voltage:0.1V

Accuracy: 234 wire method for measuring ground resistance (R):

                  ±2%rd±5dgt(0.000Ω~29.999Ω)

                  ±2%rdgt3dgt(30.00Ω~2999.9Ω)

                  ±4%rdg±3dgt(30000~30000Ω)

                 Soil resistivity (p):depends on R accuracy (p=2πaR a.1m~100m;π=3.14)

                  Grounding voltage:±2%rdg=3dgt

 note:

1.when rC max or rP max addtional tolerance st5%rdge5dgt .(rCmax4kΩ+100R<50kΩ,rP max4kN+100R<50k2)

2.Additional tolerance when 5V interferes voltage st5%rdg=5dgt.