Kyoritsu KEW 4200 Review – Earth Resistance Clamp Tester Specs
Table of ContentsGrounding systems play a crucial role in electrical safety and equipment protection. Testing these systems regularly helps ensure proper fault current dissipation and system reliability. The Kyoritsu KEW 4200 Earth Clamp Tester is designed to simplify grounding inspections by allowing technicians to measure earth resistance without disconnecting the grounding conductor or installing auxiliary rods.
Using clamp‑type measurement technology, this tester provides a fast and practical solution for evaluating grounding networks in industrial facilities, communication towers, power distribution systems, and commercial buildings.
The KEW 4200 enables quick earth resistance measurement in interconnected grounding systems. Because the device uses a clamp mechanism, testing can be performed without shutting down equipment or inserting ground stakes.
Key Features of the KEW 4200
The Kyoritsu KEW 4200 combines portability with precise measurement capabilities, making it a useful tool for electrical engineers and maintenance professionals. Its clamp sensor measures both resistance and current flowing through grounding conductors.
- Measures earth resistance without auxiliary ground rods
- True RMS current measurement for reliable readings
- Suitable for multi‑grounding electrical systems
- Noise filtering improves measurement stability
- Internal memory for storing measurement results
- High safety rating compliant with IEC standards
Traditional earth testing methods require installing additional electrodes and disconnecting the ground system. Clamp testers like the KEW 4200 simplify the process, allowing technicians to measure grounding resistance quickly in existing installations.
Technical Specifications
| Specification | Value |
|---|---|
| Model | KEW 4200 |
| Product Type | Earth Clamp Tester |
| Earth Resistance Range | 0.05Ω – 1500Ω |
| Resistance Measurement Ranges | 20Ω / 200Ω / 1500Ω |
| AC Current Measurement | 0.1 mA – 30 A (True RMS) |
| Measurement Frequency | Approx. 2400 Hz |
| Memory Capacity | 100 stored readings |
| Maximum Conductor Diameter | 32 mm |
| Power Supply | 4 × AA batteries |
| Dimensions | 246 × 120 × 54 mm |
| Weight | Approximately 780 g |
| Safety Standard | IEC 61010‑1 CAT IV 300V |
Professional Usage Tips
Clamp testers measure resistance within a closed loop created by interconnected grounding points. If only one electrode exists, the measurement may not be valid.
Position the clamp correctly
Place the clamp around a single grounding conductor for the most reliable result.
Reduce environmental noise
In electrically noisy locations, the built‑in filter can help stabilize readings.
Common Applications
The KEW 4200 is widely used across different industries where grounding reliability is critical. Technicians often rely on this instrument for preventive maintenance and system inspections.
- Electrical grounding inspection
- Power distribution system maintenance
- Telecommunication tower grounding checks
- Lightning protection system testing
- Industrial facility safety inspections
The KEW 4200 is designed for interconnected grounding systems. It cannot accurately measure the resistance of a single isolated ground electrode.
For professionals who need a fast and efficient method for grounding inspections, the Kyoritsu KEW 4200 offers a practical solution. Its clamp‑based measurement method eliminates complex test setups and allows engineers to evaluate grounding performance without interrupting the system.
