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TPI ERT1500 Earth Resistance Tester is a rugged, simple to use, professional grade digital earth resistance tester designed for demanding maintenance projects.

TPI ERT1500 Digital Earth Resistance Tester
TPI ERT1500 Digital Earth Resistance Tester

The ERT1500 checks the condition of your electrical ground system.

  • Earth resistance: Available 3 or 2 pole measurement
  • AC Voltage
  • Resistance Range: 20Ω/200Ω/2000Ω
  • Easy to view display
  • High Impact Case

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Measuring Earth Resistance

1. Normal Earth Resistance Measurement

  • Connection of test leads
    Stick the auxiliary earth spikes, P and C, into the ground as shown in Figure 1 of the instruction manual. They should be aligned at an interval of 5 to 10 meters from the earthed equipment under test. Connect the green lead wire to the terminal E (T1) of the instrument, the black wire to the terminal P (T2) and the red wire to terminal C (T3).
    Note: Make sure to stick the auxiliary earth spikes in the moist part of the the earth. Give enough water when the auxiliary earth spikes have to be stuck into the dry, stony or sandy part of the earth so that it may become moist.
  • Earth Resistance Measurement
    Set the function switch to 2000Ω or 20Ω position and make another measurement.
    Note: If the earth resistance of auxiliary earth spike C is too high to make measurement, the main digit reads “—-“. When this occurs reduce the earth resistance, for example by adding moisture to the part of the earth where the spike is stuck, and check the test lead for loose connection.

2. Simplified Earth Resistance Measurement

Use this method when there is no space to stick auxiliary earth spikes. In this method, an existing earth electrode with a low earth resistance, such as a metal water pipe – a common ground point of of a commercial power supply and an earth terminal of a building – can be used in place of C and P earth spikes.

  • Connection of test leads
    Make connection as shown in Figure 2 of the instruction manual.
    Note: short P and C terminals with a shorting wire.
  • Earth Resistance Measurement
    Set the function switch to the 2000Ω position and press test button to perform measurement. Then, if necessary, turn the function switch to the 200Ω or 20Ω position and perform another measurement.
    * The instrument does not trip any residual current circuit breaker in a power distribution circuit since its measuring current is less than 2mA
    * True earth resistance value Rx is calculated as follows:
    RX=RE – re
    re: Earth resistance of a common earth of commercial power supplly etc.
    RE: Reading of the instrument

 Model ERT1500 Specifications
 AC Voltage Ranges  Measuring Ranges: 200V/600V
 Input Impedance: Approx 10MΩ
 Input Frequency: 45Hz - 450Hz
 Accuracy: ±3% rdg. ±5dgt
 Earth Resistance Ranges
 Measuring Ranges: 20Ω/200Ω/2000Ω
 Test Waveform: Approx. 8ooHz AC / Less Than 50V RMS
 Accuracy: 20Ω ±3% of rdg. ±5dgt. ±0.1Ω
 200Ω / 2000Ω ±33% rdg. ±35 dgt.
 Operating Temperature  0° - 40° C
 Storage Temperature  -10°C - 50° C
 Operating Humidity  70% Max
 Storage Humidity  80% Max
 Dimensions  170mm X 210mm X 90mm
 Weight  2.5Kg
 Power Supply  8 X 1.5V Battery (Type AA or R-6)
 EC Conformity  EN 50081-1, EN 50082-1, EN61010-1, EN61010-2-031, EN61557-5
 Category  CAT III 600V

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Click on any image below for high resolution alternate product photography:

TPI ERT1500 Digital Earth Resistance Tester Closed
TPI ERT1500 Digital Earth Resistance Tester Case
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