What does HFE represent on a multimeter?
The HFE file on the multimeter is to measure the crystal transistor current amplification, and there are sockets for measuring the crystal transistor on this kind of meter. hFE file is mainly used to measure the amplification of β-value, and before the measurement, it should be determined that the transistor is PNP or NPN type, and at the same time, it should be determined that the polarity of each pin.
Usage: Insert the triode into the corresponding polarity socket when measuring, and you can read the current amplification of the triode.
The multimeter head is a sensitive ammeter. The dial on the head is printed with a variety of symbols, scale lines and numerical values. The symbol A a V a Ω indicates that the meter is a multi-meter that can measure current, voltage and resistance.
The dial is printed on a number of scales, the right end of which is marked "Ω" is the resistance scale, the right end of which is zero, the left end of the ∞, the distribution of scale values is uneven. Symbol "-" or "DC" for direct current, "~" or "AC " indicates AC, and "~" indicates a scale line shared by AC and DC. Several lines of numbers under the scale line are the scale values corresponding to the different gears of the selector switch.
Multimeter working principle:
The basic principle of the multimeter is to use a sensitive magneto-electric DC ammeter (microammeter) as a meter head. When a small current passes through the head, a current is indicated. However, the head cannot pass large currents, so some resistors must be connected in parallel and series on the head to shunt or step down the voltage, thus measuring the current, voltage and resistance in the circuit.
