Why does the multimeter have numbers and some have no numbers when measuring current?
First of all, you should confirm whether the gear is correct. Most digital clamp meters have additional functions such as voltage, which need to be plugged in to use these functions.
Second, check to see if you are measuring AC or DC. The clamp meter should be in the corresponding gear. It should be noted that many low-end clamp meters do not have the function of measuring DC current. If you want to measure DC current, you should use the DC current gear.
It may be that the range of the clamp meter you are using is too large; it may be that there is no load current in the line.
Regardless of the mechanical pointer clamp meter or the digital clamp meter, the structure and working principle of an important part of the two meters are exactly the same; that is, the current transformer. The iron core of the current transformer with this result has a movable part, which helps the user to clamp the measured wire into the jaw conveniently and use the working principle of electromagnetic induction to measure. At this time, the wire in the clamp meter is called the primary side; the induction coil inside the clamp meter is called the secondary side.
In order to measure currents of different sizes, different ranges are set in the clamp meter.
It has 2A range (resolution 1.0mA, accuracy ±2.0%, reading + 5 digits); 20A range (resolution 0.01mA, accuracy 1.5%, reading + 5 digits); 200A range (resolution 0.1 mA, accuracy 1.5%, reading + 5 digits); 600A range (resolution 1.0mA, accuracy 2.0%, reading + 5 digits).
