Introduction to ammeter

Introduction to ammeters

Also called “amperes”.

–The ammeter is a tool for measuring the current in the circuit

–In the circuit diagram, the symbol of the ammeter is “circle A”

–DC ammeter The structure mainly includes: three binding posts [there are “+”, “-” two binding posts, such as (+,-0.6,-3) or (-,0.6,3)], pointer, scale, etc. (AC ammeter No positive and negative terminals)

–The usage rules of the ammeter:

①The ammeter should be connected in series in the circuit (otherwise short circuit.);

②The current should be input from the “+” terminal and out from the “-” terminal (otherwise the pointer will reverse.);

③The measured current should not exceed the range of the ammeter (you can use the test Check whether it exceeds the range.);

④It is absolutely not allowed to connect the ammeter to the two poles of the power supply (the internal resistance of the ammeter is very small, equivalent to a wire. The ammeter is connected to the two poles of the power supply, and the pointer will be distorted in light, and the ammeter, power supply, and wires will be burned in heavy.

–ammeter reading:

1. See the range clearly

⒉See the division value (generally speaking, the division value of the range 0~3A is 0.1A, and 0~0.6A is 0.02A)

⒊See clearly where the hands stay (must be observed from the front)

–Preparation before use:

1. Zero calibration, use a flat screwdriver to adjust the zero calibration button.

⒉Select the range {estimated by experience or by trial method}