S480A – 4 Terminal Earth Tester
2-, 3- and 4-terminal earth resistance measurements
4-pole Wenner method for soil resistivity
Best earth resistance resolution: 0.001 Ω
Ground voltage measurement at 50/60 Hz
Automatic range and test-frequency selection
Handheld design with adjustable LCD backlight
Product Description
The S480A is a handheld earth ground tester for measuring earth electrode resistance, soil resistivity and ground voltage. It supports two-, three- and four-terminal resistance measurements, and uses the four-pole Wenner method for soil resistivity.
Automatic range selection and test-frequency selection support field measurements. The instrument provides a best earth resistance resolution of 0.001 Ω and an adjustable LCD backlight for reading results in darker locations.
Technical FAQ
Does S480A measure both earth resistance and soil resistivity?
Yes. Earth resistance is measured in ohms (Ω). Soil resistivity is measured separately using the four-pole Wenner method and is expressed in ohm-metres (Ω·m).
Which connection methods are available?
The published datasheet lists two-, three- and four-terminal methods for earth resistance, plus a four-pole connection for Wenner soil resistivity measurements. These functions should be selected for the measurement being performed.
How is the test frequency selected?
The datasheet lists 412 Hz, 825 Hz and 1280 Hz with automatic selection.
Is soil resistivity accuracy independent of resistance accuracy?
No. The datasheet states that soil resistivity accuracy depends on the resistance measurement accuracy. Its calculation uses ρ = 2πaR, with electrode spacing a specified from 1 m to 100 m.