Why do I measure the current with a clamp ammeter every time I install the motor?
Measuring the actual current of a phase line with a clamp ammeter, because the clamp ammeter is equivalent to the CT of a primary winding opening, how many times the current is detected once will reflect the display, how much is connected with the three-phase motor The law does not matter.
The first step is to separately measure the phase voltage of the secondary side of the voltage transformer (the method is the same as above), and directly measure the phase voltage (the input end of the clamp meter. But you need to insert the test pen to select the appropriate range. Its "mount" can only measure the AC current, the special clamp card table. The pointer stays on the right, the use method is the same as the ordinary multimeter, and the low-grade is gradually lowered from the high-grade when the unknown voltage is high or low;
In the second step, the voltage is measured in parallel by the test leads. The clamp meter measures the voltage through the clamp meter of the attached multimeter. The voltage cannot be directly clamped and the switch is modulated to the appropriate range.
First, the use of digital clamp meter
1. Mechanically zero before measurement.
2, select the appropriate range, first select the big, then select the small range or look at the nameplate value estimate.
3. When the minimum range measurement is used and the reading is not obvious, the wire to be tested can be wound a few turns, and the number of turns should be based on the number of turns in the center of the jaw. Then the reading = indication value × range / full deviation × number of turns .
4. After the measurement is completed, the transfer switch should be placed at the maximum range.
5. When measuring, the wire to be tested should be placed in the center of the jaws and the jaws should be closed tightly to reduce the error.
Second, the digital clamp meter notes
1. The voltage of the tested line is lower than the rated voltage of the clamp meter.
2. When measuring the current of the high-voltage line, wear insulated gloves, wear insulated shoes, and stand on the insulating mat.
3, the jaws should be closed tightly and cannot be charged for the range.
Using a clamp-type ammeter to measure the current of a single winding of a motor is a phase current, but it will cause trouble for the actual measurement, or connect three pairs of winding wires to the outside; the current on the power line is always the line current; The power is hard, not practical, the power factor is an uncertainty factor, unless you still have a power factor meter, but you know that the power factor is changing due to the load.
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