How to use a clamping ammeter
When using a clamp ammeter to detect current, it is necessary to clamp one of the tested wires (wires). If two parallel wires are clamped, the current cannot be detected. In addition, when using the center (iron core) of the clamp ammeter for detection, the detection error is small. When checking the power consumption of household appliances, using a wire separator is more convenient. Some wire separators can amplify the detection current by 10 times, so the current below 1A can be amplified before detection. When using a DC clamp ammeter to detect DC current (DCA), if the current direction is opposite, it will display a negative number. This function can be used to detect whether the car's battery is in a charging or discharging state
True RMS detection
The clamp ammeter with the average value method detects the average value of the sine wave through AC detection, and displays the value after amplification by 1.11 times (sine wave AC) as the effective value. Waveforms and skewed waves with different waveform rates other than sine waves are also displayed after amplification by 1.11 times, which will cause indication errors. Therefore, when detecting waveforms and skewed waves other than sine waves, please choose a clamp ammeter that can directly test the true effective value
Leakage detection
Leakage detection is different from typical current detection, where two (single-phase 2-wire) or three (single-phase 3-wire, three-phase 3-wire) wires need to be clamped together. It is also possible to clamp the grounding wire for testing. The insulation management method for detecting leakage current on low-voltage circuits has become the primary means of judgment. Since its confirmation by the 1997 revision of electrical equipment technical standards, leakage current clamp meters have gradually been used for testing in buildings and factories where power cannot be cut off
