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Hioki 3151
Earth HiTester
Insulation Tester/Earth Meter

  • Electrical grounding or mesh grounding.
  • Electrical power equipment grounding.
  • When the measurement point is located at a distance from the insertion point of the grounding electrode.
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Hioki 3151 Shown
Product Information
Datasheet 259 KB
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Ground resistance meter 3-electrode measurement on the 3151 gives greater precision!
Ground resistance measurement involves factors that are not encountered during ordinary resistance measurement, such as polarization of the earth, the influence of grounding current due to leak current and grounding voltage, and the influence of auxiliary grounding resistance. The 3151 is able to make more accurate measurements more safely under difficult conditions because it uses the alternating current potentiometer method to provide measurement accuracy, and because it contains features such as an auxiliary grounding resistance check feature and measurement frequency switching.

Differences between the Model 3151 and 3143
Common ground resistance meters such as the 3151 measure the resistance using a frequency between 500 Hz and several kHz.
The 3143 uses a frequency between 100 kHz and 1.5 MHz, close to that of a lightning surge. Therefore, measurement errors can result if the 3143 is used in situations such as the following.
In these instances, we recommend using Model 3151.
Ground resistance 10 ohm (0 to 11.5 ohm), 100 ohm (0 to 115 ohm), 1000 ohm (0 to 1150 ohm), 3 ranges (±2.5 % f.s.)
Ground voltage 30 V (0 to 30 V), (±3.0 % f.s.)
Operating method AC potentiometer method
Open circuit voltage 50 V AC max.
Measurement current 15 mA AC max. (3 mA AC max. when using the two electrode method)
Measurement frequency 575 Hz (with 3a or 2a selected) or 600 Hz (with 3b or 2b selected)
Power supply R6P(AA) manganese batteries × 6 (at least 500 operations), or LR6(AA) alkaline batteries × 6 (at least 1400 operations)   Note:30 seconds measurement, 30 seconds off operating time
Dimensions, mass 164 mm(6.46 in)W × 119 mm(4.69 in)H × 88 mm(3.46 in)D, 800 g (28.2 oz)
Ordering Information
Model Description Buy Online Price
3151 Hioki 3151 Earth HiTester Buy Now $555.00
Included Accessories
  • 1 - 9214 Auxiliary Earthing Rods
  • 2 - 9215 Measuring Cable (black 5m(16.41ft) yellow 10m(32.81ft), red 20m(65.62ft))
  • 3 - 9216 Cable Winder
  • 1 - 9393 Carrying Case
  • 1 - Users Manual