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S470 – 3 Terminal Earth Tester

  • Two-terminal and three-terminal earth resistance measurements

  • Earth resistance range: 0.000 Ω to 200 kΩ

  • Best resistance resolution: 0.001 Ω

  • Ground voltage measurement at 50/60 Hz

  • Data hold and storage for 300 records

  • Interference indication and preset audible alarm

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Product Description

The S470 is a carry-case earth resistance tester for measuring earth electrode resistance, grounding voltage and low-value resistance. It supports two-terminal and three-terminal measurements, with an earth resistance range of 0.000 Ω to 200 kΩ and a best resolution of 0.001 Ω.

A large LCD displays the measurement, while data hold and storage for 300 records support reviewing results in the field. The instrument indicates interference and provides an audible alarm when a reading exceeds the preset threshold.

Technical FAQ

Which earth resistance measurement methods are available?
The S470 supports three-terminal and two-terminal electrode methods. Its published datasheet lists separate test leads for these connections and auxiliary ground rods; a clamp-only or stakeless test method is not specified.
What are the resistance range and resolution?
The published range is 0.000 Ω to 200 kΩ, with a best resistance resolution of 0.001 Ω. Accuracy depends on the resistance range and the specified test conditions; resolution and accuracy are different specifications.
Can measurements be held and reviewed later?
Yes. The datasheet specifies data hold, storage for 300 records and a READ function for reviewing saved data.
How does the instrument indicate interference?
A NOISE indication appears when the interference voltage exceeds 5 V. The datasheet also gives an additional accuracy error at an interference voltage of 5 V, so the indication should be considered when reviewing a measurement.