Earthing Resistance Tester

When we need to perform Earthing or grounding resistance measurement,the important equipment that we must have is the Earthing resistance tester.

We can found many types and brand of Earthing resistance tester in the market.It’s depend on our budget,requirement and application on actual work site.We need to ensure this device must always calibrated to get the accurate reading.

This equipment is used to measure the resistance ( ohm) of the earth.It is important to ensure that the electrical installation grounding system in accordance with the specifications and meet the earthing requirement.

What is Earthing Resistance Tester?

First we must know about Earth Resistance Tester specification.

Measurement Ranges  :

  • Earth Resistance : 0 – 20W /0 – 200W /0 – 2000W
  • Earth Voltage : (50Hz, 60Hz) 0 – 200V AC

Overload Protection :

  • Earth Resistance : 200V AC 10 seconds (across two of the three terminals)
  • Earth Voltage : 300V AC for 1 minute

Accuracy :

  • Earth Resistance
    ±2%rdg ±0.1W (20W range)
    ±2%rdg ±3dgt (200W /2000W range)
  • Earth Voltage : ±1%rdg ±4dgt

Safety Standard :

  • IEC1010-1 CAT.III

Withstand Voltage

  • 3700V AC for 1 minute

Power Source :

  • R6P (AA) x 6

Accessories :

  • Model/Part No.7095 (Test Leads) x 1set.
  • Model/Part No.8032 (Auxiliary earth spikes) x 1set.
  • Model/Part No.7094 (Simplified measurement probe) x 1set.
  • R6P (AA) x 6 batteries.
  • Model/Part No.9084 Carrying Case.
  • Neck Strap.
  • Instruction Manual.

Features :

  • Dust and drip proof. (designed to IEC 529 IP54)
  • In addition to the facility for precision measurement, test leads for simplified two wire measuring system also supplied as standard accessories. (unit can be hung from the neck for simplified measurement)
  • Designed to meet IEC1010-1 safety standard
  • Automatic warning when resistance of auxiliary earth spikes is in excess of tolerance
  • 2mA measuring current permits earth resistance tests without tripping earth leakage current breakers in the circuit under test.


Earthing Resistance Tester Layout Diagram






Principle of Earthing Measurement

 This instrument makes earth resistance measurement with fall-of potential method, which is a method to obtain earth resistance value Rx by applying AC constant current I between the measurement object E (earth electrode) and C (current electrode), and finding out the potential difference V between E and P (potential electrode).

Rx = V / I

How to perform the earthing test?


I will explain more detail about How to perform Earth resistance Measurement and the right technique.


  1. Hello.

    I would like to know in more detail how to perform the earth resistence measurement.
    In my case I can’t use auxiliar spikes because all is concrete around my test site.

    • Hello Luis..thanks for visit my blog…i suggest you to read my post TWO-POINT METHOD,I explain how to perform earth resistance measurement for concrete or tar surface…i hope it can help you…have a nice day

  2. JJERNB says


    regarding equipment earthing do you have any idea how to be done? We do it the E (green) is connected to electrode,the P (yellow) is connected at any point and C (red) is connected to the earth terminal of the equipment the reading we got is 1.4 – 1.6 ohm so the testing is failed.. This procedure are correct? the result shall be not exceed to 1ohm.. What’s the remedy? If it is wrong what is the correct procedure?

  3. thysokkhy says

    i am in cambodai so how could i buy this earth test meter? how to measurment the earthing system and how to calculate it.

  4. Ugwu Nelson says

    I need a circuit diagram of an earth tester

  5. Can you us a regular megger to test earth ground and if so how thanks.

    • John Lemau says

      It not possible..please use right meter to measure earth resistance.. now the price is reasonable

  6. looking for earth tester

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