Clamp meter operating steps
When using a clamp ammeter to detect current, be sure to clamp one conductor (wire) to be measured. If you clamp two (parallel wires), the current cannot be detected. In addition, when using the center (core) of the clamp ammeter to detect, the detection error is small .When checking the power consumption of home appliances, it is more convenient to use a line separator. Some line separators 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 flows in the opposite direction, a negative number is displayed. This function can be used to detect whether the car's battery is in a charged or discharged state.
True valid value detection
The average value method clamp ammeter detects the average value of the sine wave through AC detection, and displays the value after amplifying 1.11 times (sinusoidal AC) as the effective value. Waveforms other than sine waves and skew waves with different waveform rates can also be detected. It is also displayed after being magnified 1.11 times, so there will be an indication error. Therefore, when detecting waveforms other than sine waves and distorted waves, please choose a clamp ammeter that can directly test the true effective value.
Leakage detection
Leakage detection is different from ordinary current detection. Two (single-phase 2-wire type) or three (single-phase 3-wire type, three-phase 3-wire type) must be clamped. The ground wire can also be clamped for detection. The insulation management method for detecting leakage current on low-voltage circuits has become the primary means of judgment. Since its confirmation (revision of technical standards for electrical equipment in 1997), it has been used in buildings and buildings that cannot be powered off. Factories gradually use leakage current clamp meters to detect leakage current.
