S470A – 3 Terminal Earth Tester product image 1

S470A – 3 Terminal Earth Tester product image 2

S470A – 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

Product Description

The S470A is a handheld 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 S470A 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.