What is the hfe range of a multimeter?
2 Answers
The HFE range on a multimeter is used to measure the current amplification factor of a transistor. Here is the relevant introduction: Introduction: A multimeter, also known as a multitester, volt-ohm meter, or VOM, is an essential measuring instrument in power electronics and other fields, typically used to measure voltage, current, and resistance. Multimeters are categorized into analog and digital types based on their display method. They are multifunctional, multi-range measuring instruments. Basic uses: A multimeter can not only measure the resistance of an object but also AC and DC voltages. Some multimeters can even measure the main parameters of transistors and the capacitance of capacitors. Mastering the use of a multimeter thoroughly is one of the most fundamental skills in electronic technology.
When working on electronic DIY projects, I often use the HFE function on my multimeter. It specifically measures the current amplification factor of transistors, essentially showing how much the input current can be amplified. I insert the three pins of the transistor into the corresponding sockets on the multimeter—usually E (Emitter), B (Base), and C (Collector). If the reading is too low or shows no response, the transistor might be faulty or connected with incorrect polarity. In practical projects, such as repairing vintage radios or building homemade amplifiers, the HFE test helps quickly identify good and bad transistors. It also allows me to pair transistors with similar values for stereo output, resulting in more balanced sound quality. I remember one instance in an amplifier circuit where a transistor with excessively high HFE caused significant noise; replacing it with one in the moderate range made a noticeable improvement. This function is straightforward to use, making it easy even for hobbyists like me who are self-taught. It has saved me a lot of troubleshooting time and deepened my understanding of how electronic components work. Now, whenever I inspect small appliances, I make it a habit to use the HFE function as a first check.
