Two detection methods of clamp ammeter
When using a clamp ammeter to detect current, be sure to clamp one of the measured wires (wires). If two (parallel wires) are clamped, the current cannot be detected. In addition, when using the clamp ammeter center (core) for detection, the detection error is small .When checking the power consumption of home appliances, it is more convenient to use a line splitter. Some line splitters can amplify the detection current by 10 times, so the current below 1A can be amplified before detection. Use a DC clamp ammeter to detect the DC current (DCA), if the current flow is opposite, it will show a negative number. This function can be used to detect whether the car's battery is in a charging state or a discharging state.
True RMS detection
The clamp ammeter of the average value mode detects the average value of the sine wave through AC detection, and displays the value after the amplification of 1.11 times (sine wave AC) as an effective value. It is also displayed after being enlarged by 1.11 times, so there will be an indication error. Therefore, when detecting waveforms other than sine waves and crooked waves, please choose a clamp-on ammeter that can directly test the true RMS value.
Leakage detection
Leakage detection is different from the usual current detection, two (single-phase 2-wire type) or three (single-phase 3-wire type, three-phase 3-wire type) must be clamped. It can also clamp the grounding wire for detection. The insulation management method of detecting leakage current on low-voltage circuits has become the primary means of judgment. Since it was confirmed (revision of electrical equipment technical standards in 1997), it has been used in buildings and The factory gradually adopts the leakage current clamp meter to detect.
