How to measure the power of the heating tube with a multimeter
The heating tube can be regarded as a pure resistive load, and the current flowing through the heating tube is a pure active current. Use a clamp multimeter with an AC current measurement function to measure the current when the heating tube is working. The value obtained by multiplying the current value by the rated voltage of the heating tube is the power (wattage) of the heating tube.
For example, the rated voltage of an electric heating tube is 220 volts, and the measured current is about 2 amps, then the power of this heating tube is about 440 watts. If the rated voltage of the heating tube is 380 volts and the measured current is about 1 amp, then the power of the heating tube is about 400 watts.
A problem to pay attention to here is the rated voltage of the heating tube. The rated voltage of the heating tube is 220 volts connected to 380 volts, which will burn the heating wire quickly because the voltage is too high. Conversely, if the rated voltage is 380 volts, the heating tube is connected to 220 volts, and the rated power will not be reached because the rated voltage is not reached.
In actual production, 220V and 380V electric heating tubes are often used. When ordering electric heating tubes, it is best for the manufacturer to stamp the rated voltage on the heating tube shell with a steel stamp. to avoid confusion.
