DUOYI DY4100 Digital 3-Terminal Earth Resistance Tester


Regular price $89.00


  • Earth ground resistance measurements from 0.01 ohm to 2000 ohms with 0.01 ohm resolution
  • Data hold, low battery warning
  • Complete with test wires, auxiliary earth bars, heavy duty oxford fabric bag and six 1.5V AA batteries

Earth resistance measurement

  • Accurate measurement (with the equipped test leads) to puncture the P and C grounding pins to the depth of the ground. They are arranged in a straight line with the grounding equipment and are spaced 5 to 10 meters apart. (Note: Make sure the grounding pins are inserted in the wet soil. If the soil of the grounding nail is dry, it is necessary to add water or stone or the sand to be wet and test)
  • Grounding resistance test requirements:
  1. a. AC working ground, the grounding resistance should not exceed 4Ω,
  2. b, safe working ground, the grounding resistance should not be greater than 4Ω,
  3. c. DC working grounding, grounding resistance should be determined according to the specific requirements of the computer system;
  4. d, the grounding resistance of the lightning protection ground should not exceed 100Ω;
  5. e. For jointed grounding of shielded systems, the grounding resistance should not be greater than 10 Ω.

Ground voltage measurement

  • Please turn the dial switch to the grounding voltage "EV" file and connect the test line according to the grounding voltage test chart. The ground voltage will be automatically displayed. Please make sure that the ground voltage is ≤10V. If the local voltage is >10V, the grounding resistance measurement value may cause an error. At this point, the relevant electrical equipment can be powered off to reduce the ground voltage before measuring.


  • MODEL:DY4100
  • Earth Ground Resistance:0/20/200/2000Ω ±(2%+3)
  • Earth Voltage:0~30V ±(3%+5)
  • Resolution:0.01Ω
  • Data Hold:yes
  • Working LED Indicator:yes
  • Function Symbol Display:yes
  • Low Battery Warning:yes

Packing List

  • 1) auxiliary earth bar*2
  • 2) testing wire    (red 1 5-meter testing wire*1 / yellow 10-meter testing wire*1  /  green 5-meter testing wire*1)
  • 3) simple testing wire    (red 1.6-meter testing wire*1  / green 1.6-meter testing wire*1)
  • 4) instruction manual*1
  • 5) tool bag*1
  • 6)Matched battery model:
  1. 1. 5V(R6AA) battery*6
  2. 12V(23A) battery*1
  3. Battery is not included in the accessory