S692 Earth Ground Clamp Tester

Clamp-on ground-loop resistance measurement from 0.025 Ω to 1500 Ω
AC True RMS current measurement up to 40 A
Resolution down to 0.001 Ω for resistance and 1 µA for current, depending on range
45 mm jaw opening and 9999-count colour TFT display
Low-pass filter, Data Hold and user-set high/low alarms
Saved measurements, interval recording and Bluetooth data transfer

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Product Description

The S692 is an earth ground clamp tester for ground-loop resistance and AC leakage-current measurements in multi-grounded installations. Its clamp method uses the existing ground return path, allowing suitable grounding connections to be checked without auxiliary stakes or disconnecting the conductor. The specified ground-loop range is 0.025 Ω to 1500 Ω.

The instrument also measures AC True RMS current up to 40 A, with resolution down to 1 µA on its lowest current range. A 45 mm jaw, colour TFT display, low-pass filter and high/low alarms support field readings. Memory review, interval recording and Bluetooth transfer help record and compare measurements.

Technical FAQ

Can a clamp ground tester measure a completely isolated grounding electrode?

Normally, no. A clamp ground-resistance tester requires a closed conductive loop through the grounding system. The instrument induces a test signal into the loop and measures the resulting current. A single isolated rod with no parallel return path does not form a complete loop, so a valid clamp resistance measurement cannot be obtained. In that situation, use an appropriate fall-of-potential or other stake-based test method.

Why does the S692 show an unstable or unusually high resistance?

Check that the clamp jaws are completely closed and that the mating surfaces are clean. Dirt, corrosion, jaw misalignment or a conductor positioned incorrectly in the clamp can affect the magnetic circuit. The grounding system may also have intermittent connections or excessive electrical interference. Clean the jaws, clamp only one conductor, repeat the measurement and compare the result at a stable position on the conductor.

How does the S692 measure earth leakage or residual current?

To measure current flowing in a grounding conductor, clamp around that conductor only. For residual leakage in a single-phase circuit, clamp around the live and neutral together, excluding protective earth. For three-phase residual measurement, include all live phase conductors and the neutral where present. The balanced load currents cancel, leaving the residual current. This differs from measuring the load current in one conductor; the manual illustrates both methods.

Can results be saved or recorded over time?

The S692 provides saved-measurement recall and interval recording, as well as Bluetooth data transfer. The recording interface allows the recording interval and duration to be set, and stored measurements can be recalled on the instrument.