Detection method of clamp ammeter and leakage current clamp meter
When detecting current with a clamp ammeter, be sure to clamp a wire (wire) to be measured.
The current cannot be detected by clamping two (parallel lines).
In addition, when the clamp ammeter is used to detect the center (core), the detection error is small.
When checking the power consumption of household appliances, it is convenient to use line separators. Some line separators can amplify the detection current by 10 times, so the current below 1A can be amplified before detection.
When DC clamp ammeter is used to detect DC current (DCA), if the current flows in the opposite direction, it will show a negative number. This function can be used to detect whether the battery of an automobile is charged or discharged.
Detection method of clamp ammeter
Detection of True Effective Value (RMS)
The average clamp ammeter detects the average value of sine wave through AC detection and amplifies it by 1. The value after 11 times (sine wave AC) is displayed as an effective value.
Waveforms other than sine waves with different waveform rates and crooked waves are also amplified by 1. It will be displayed after 11 times, so there will be an indication error.
Therefore, when detecting waveforms other than sine wave and crooked wave, please choose the clamp ammeter which can directly test the true rms value. DCL20R DCL30DR
Leakage detection (DCL330L-DCL-400A)
Leakage detection is different from the usual current detection, and two (single-phase 2-wire type) or three (single-phase 3-wire type, three-phase 3-wire type) should all be clamped. You can also clamp the grounding wire for detection.
Detection method of leakage clamp ammeter
The insulation management method of detecting leakage current in low-voltage circuit has become the primary judgment means. Since it was confirmed by the revision of the technical standard of electrical equipment in 1997, the leakage current clamp meter has been gradually used to detect it in buildings and factories where power failure cannot occur.
