How to Measure DC Current with AC/DC Clamp Meter
Clamp ammeter is specially used to measure the AC and DC current of a tool, measuring current is not like a multimeter or other ammeter as need to be disconnected and access to the line being measured, only need to be measured line in the centre of the jaws and read the value can be. Here we look at its specific use.
1, in the measurement of current before, need to have a rough estimate of the measured current, to determine the DC current or AC current, and then select the DC or AC gear, and select the appropriate range. When you can not predict the size of the measured current, you should first choose a large range to test, and then reduce the range to improve the accuracy of the value.
2, after selecting a good range, will be measured on a single line in the jaws of the middle position, try not to let the wire leaning on the body of the table, to be a stable value can be read after the value. Explain that the clamp meter can only measure single-stranded line, can not measure and stranded line, this is because the clamp meter is the use of the principle of mutual inductance to measure the current, if the fire line and the zero line at the same time placed in the jaws of the two lines flow through the current is equal to the secondary transformer will not produce current, then the clamp meter detection value should be zero.
The left side of the above figure for the wrong demonstration, the right figure for the correct way to use, clamp meter is mainly measure current, but also can measure voltage and resistance, use the same method and ordinary multimeter.
Clamp ammeter is generally used to test the AC current. It is made according to the principle of AC snail current, and the transformer is somewhat similar, through electromagnetic induction to obtain the signal. Measurement of DC ammeter I am used in series on the circuit, but from the theory, made into a DC clamp meter is likely to work.
