How to use super large caliber clamp ammeter and precautions
A clamp ammeter is a combination of a current transformer and an ammeter. The iron core of the current transformer can be opened when the wrench is tightened; the wire through which the measured current passes can pass through the gap opened by the iron core without being cut off, and the iron core is closed when the wrench is released.
How to use super large caliber clamp ammeter
When using a clamp ammeter to detect the current, be sure to clamp a measured wire (wire). If two (parallel wires) are clamped, the current cannot be detected. In addition, when the center (core) of the clamp ammeter is used 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 flows in the opposite direction, it will display 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 method detects the average value of the sine wave through AC detection, and displays the value after amplifying 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 use 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.
Precautions for use of ETCR7100A ultra-large caliber clamp ammeter
① When performing current measurement, the position of the carrier fluid to be measured should be placed in the center of the jaws to avoid errors.
②Estimate the magnitude of the measured current before measurement, and select a suitable range. If the current magnitude is not known, select the maximum range, and then reduce the range appropriately according to the pointer, but do not change the range during measurement.
③ In order to make the reading accurate, the jaws should be kept clean and undamaged. If there is dirt, it should be cleaned with gasoline and then measured.
④ When measuring the current below 5A, in order to measure accurately, it should be measured in circles.
⑤The clamp meter cannot measure the current of bare wires to prevent electric shock and short circuit.
⑥ After the measurement, be sure to place the range division knob on the maximum range position.
