The KYORITSU 4202 Earth/Ground Clamp Tester has various useful functions available on Android devices using Bluetooth communication
- Real time measurements can be transferred, shown and saved on Android device (up to 100 measurements)
- Saved data includes measurement, GPS location and date & time Easy to check on map “When” and “Where” the measurement was made
- Comparator function on Android device informs when the measured value is lower/higher than the preset value
Earth/Ground resistance and Leakage current measurement functions
• The earth resistance from 0.05 to 1500 Ω can be measured without the auxiliary earth spikes in multi-earthing systems
• True RMS leakage or phase current readings from 0.1mA to 30.0A provides vital additional information in earthing networks
• Filter function offers increased immunity to electrical noise and a Noise mark appears in excessively high noisy environments
Measurement principle (Why Earth Resistance can be measured by only Clamping it)
This instrument can measure the earth resistance to earth in multi-earthed system. Let’s regard earth resistance under test as Rx, and the other earth resistances as
R1, R2, …Rn.
Of these earth resistances, R1, R2, …Rn can be considered that they are connected in parallel and can be regarded as a combined resistance Rs. The Rs can be regarded small enough against Rx since a combined resistance consists of several resistances. Following is an equivalent circuit diagram of this circuit
