So messen Sie Gleich- und Wechselstrom mit einem Multimeter
A multimeter is a commonly used detection instrument, which is well-known and widely used due to its high measurement accuracy and resolution. How to measure DC and AC currents with a multimeter?
1. Before measuring the current, first determine the nature of the current (AC and DC) and the range of current magnitude.
2. Choose appropriate measurement tools (such as safety, accuracy, and ease of use for on-site measurements) and measurement gears. After selecting the appropriate measuring tool, if you are not a professional technician but just an enthusiast, it is recommended to read the instructions for use.
3. General operating steps:
(1) If it is a small electrical device (such as electronic equipment, etc.), you can read the product manual for the description of the product's electrical power consumption. Sometimes, this section directly indicates the current range that the electrical device passes through during operation in the manual. If the manual only indicates the power consumption and voltage, the current can be calculated using the formula "A=W/V". When it is necessary to test the total current when multiple devices are working, the currents of individual devices are added together to calculate the total current on the main line.
If actual measurement is required:
Select the appropriate gear (measure current, range of current values)
Disconnect the tested circuit (but the electrical equipment and load cannot be disconnected, otherwise it will be a short circuit!), insert the multimeter into the circuit (note that it is connected in series), and the resistance of the multimeter will be almost zero. The current flowing through the multimeter is equal to the current flowing through the electrical equipment and load.
(2) If it is a larger electrical equipment (working voltage is generally 220V to 380V), it is recommended to use a clamp ammeter (multimeter). The principle is to form a closed electromagnetic field on the electrified line, and the change in the electromagnetic field causes the multimeter to generate current. There is a proportional relationship between this current and the measured line current, so the line current can be directly read in the ammeter.
