To use the hFE function of a multimeter, follow these steps
Preparation: First, ensure that the battery of the multimeter is fully charged and check for any damage. Check and select the correct measurement range.
Measure resistance: Turn the multimeter knob to the Ω position and touch the resistance measurement terminal. If it is a high resistance value, choose a higher measurement range, and if it is a low resistance value, choose a smaller measurement range.
Measure voltage: Turn the knob of the multimeter to the V position and select the appropriate voltage range. Connect the red probe to the positive pole of the measured voltage and the black probe to the negative pole, and read the voltage value on the display screen.
Measure current: Turn the knob of the multimeter to position A and select the appropriate current range. Connect the red probe to the current input terminal and the black probe to the input return terminal, open the circuit, and read the current value on the display screen.
Measure capacitance: Turn the knob of the multimeter to position F and select the appropriate capacitance range. Connect the red probe to the positive terminal of the capacitor and the black probe to the negative terminal, and read the capacitance value on the display screen.
Measure diode: Turn the knob of the multimeter to the hFE position and select NPN or PNP type. Connect the red probe to the base and the black probe to the collector, and read the hFE value on the display screen.
Other measurements: As needed, a multimeter can also be used to measure other quantities such as frequency, temperature, induced voltage, etc.
Instructions for using the hFE function of a multimeter:
HFE refers to the DC amplification factor of a transistor, which is the ratio between the change in base current and the change in collector current when the transistor is operating in an amplified state. The measurement of hFE is an important part of transistor detection and one of the important functions of a multimeter.
Preparation: First, determine whether the transistor to be tested is PNP or NPN type.
Select test mode: Set the multimeter knob to the hFE position.
Connect the test circuit: Connect the red probe to the base of the transistor and the black probe to the collector.
Start testing: Turn on the switch of the transistor to be tested and observe the hFE value on the multimeter.
Result interpretation: Based on the hFE value displayed on the multimeter, determine whether the transistor is working properly. Generally speaking, the hFE of NPN transistors should be between 100-1000, while the hFE of PNP transistors should be between 50-500.
Summary:
A multimeter, as a commonly used measuring instrument, plays an important role in electronic engineering. By mastering the usage steps of a multimeter and the use of hFE functions, it is more convenient and accurate to measure resistance, voltage, current, capacitance, and transistors.
