S710 - Online Earth Resistance Tester

Online monitoring of earth resistance and ground voltage
2-wire and 3-wire electrode measurement methods
Resistance range: 0.01 Ω to 2000 Ω
DIN rail mounting with local OLED display
Test-lead resistance calibration
RS485 communication with MODBUS protocol

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Product Description

The S710 is an online earth resistance monitor for installed monitoring of grounding systems. It measures earth resistance, ground voltage, equipotential bonding resistance and low-value resistance using two-wire or three-wire electrode methods.

A compact DIN rail design and local OLED display support integration into a monitoring installation. Test-lead resistance calibration is provided, while RS485/MODBUS supports custom monitoring software and multiple measuring points. A communication converter is available as an option.

Technical FAQ

Is RS485/MODBUS communication included as standard?

Yes. RS485 communication and the MODBUS protocol are standard functions. The communication converter is optional.

Does S710 require an electrode connection?

Yes. It uses electrode-based two-wire or three-wire measurement methods. In the simple two-wire method, the reading includes the resistance of the auxiliary earth connection, which needs to be considered when interpreting the result.

What is the purpose of test-lead calibration?

The wire resistance calibration function measures and stores the connected test-lead resistance. The manual states that the calibration should be repeated when the test leads are changed.

How does ground voltage affect resistance monitoring?

The manual specifies ground voltage below 10 V for earth resistance measurements. Ground voltage is a separate measurement function; its wider voltage range should not be read as an earth resistance test condition.