Hioki 3151 Earth HiTester

Standard ground resistance measuring instrument


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 pot ent iomet er met hod t o provide measurement accuracy, and because it contains features such as an auxiliary grounding resistance check feature and measurement frequency switching.


  • Wide measurement range
    Take measurements to 115% of the measurement range.
  • More stable measurement
    Easily check the grounding condition of auxiliary grounding rods for better accuracy. Further, the measurement frequency switching lets you avoid influences such as that of high frequency grounding current.
  • Simple measurement feature
    Switch between "normal" and "simple" measurement modes with the press of a button.
  • Overvoltage protection and alarm feature
    If wires are incorrectly connected (as often happens during simple measurement of commercial power supplies), safety is provided by an alarm buzzer and overvoltage protection.
  • Resistant to dirt
    Parts such as the measurement switches and measurement dial have increased dust resistance and durability.
  • More convenient accessories
    A cable winder ensures freedom from cable tangles, and a convenient carrying case accommodates all measurement materials.



Influence of auxiliary grounding resistance:

± 5% for a fluctuation of 0 to 5 kΩ

Influence of grounding voltage:

± 2% for 0 to 5 V

± 5% for 0 to 10 V (for 50/60 Hz)

± 5% for 0 to 3 V (for DC, 162/3, 400 Hz)

Influence of power supply voltage:

within nominal deviation for DC 6 to 10 V

Operating method

AC potentiometer method

Open circuit voltage

AC 50V max

Measurement current

AC 15 mA max (AC 3 mA max when using the two electrode method)

Measurement frequency

575 Hz (with 3a or 2a selected) or 600 Hz (with 3b or 2b selected)

Operating temperature and humidity

0 to 40˚C, 80% rh maximum (no condensation)

Storage temperature and humidity

-10 to 50˚C, 80% rh maximum (no condensation)

Applicable standards

Safety: EN61010, Measurement Category II, Pollution Degree 2

EMC: EN61326

Environment protection: IP40 (EN60529)

Overvoltage protection

AC 250 V, 1 minute (between E - P (S), E - C (H) terminals)

Power supply

R6P manganese battery × 6, or LR6 alkaline battery × 6

Operating time

Approx   350 operations (using R6P battery) Approx 1100 operations (using LR6 battery) (30 seconds measurement / 30 seconds off condition)

Approximate dimensions and weight

164 (W) × 119 (H) × 88 (D) mm (not including protrusions), 800 g (main unit only)


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