![]() If you get zero, a value close to zero, or a beep, the fuse is in good condition. Set the meter to the 200 Ohm range, place the multimeter probes on the two “blade” contact ends of the fuse, and check the screen for a value after making proper contact. In case you don’t find anything wrong after a visual inspection, proceed with the regular multimeter fuse check process. These signal a bad fuse that should be replaced. Now, you visually inspect it for any dark spots signaling a burnt or blown fuse, or try to check whether the string is broken, in case the fuse is transparent. To test a car fuse, make sure the vehicle is switched off, check your vehicle fuse diagram to locate the particular fuse for the device that isn’t working, then take out the fuse using a fuse puller. They also last longer than regular fuses and are located in a fuse box. Testing Car Fuses With A MultimeterĬar fuses are peculiarly shaped, as they have “blades” rather than tabs on the two sides of them. The multimeter may also present you with “OL”, signaling that there is no continuity within the fuse at all (the metal string is blown) and the fuse should be changed. This means there is an uninterrupted path between the two multimeter leads (the metal string is still good), and additionally tells you that current can easily flow through it when required.Ī value higher than 1 means there is too much resistance within the fuse, which could be why enough current isn’t flowing through it. If the multimeter is in the Ohm setting, good fuses are expected to present you with a resistance value of zero (0) or close to zero. However, even when the multimeter produces a beep, the metal string may still have some defects, and this is where the resistance test is useful. If you didn’t get a beep, the fuse has blown and should be replaced. With the continuity mode, if the multimeter beeps, then there is continuity between the two multimeter leads (the metal string is good). The results are pretty much straightforward. Once the leads have made proper contact, check the meter screen for a reading. Measuring resistance doesn’t require you to strictly place the positive or negative lead on a particular end, so you don’t have to worry about this. Here, you simply place the multimeter leads on each contact end of the fuse, regardless of any polarity. Place Multimeter Probes On Each End Of The Fuse.If you get these, proceed to the next step. If set right, you get a value of zero (0) or close to it with the Ohms setting or hear a beep from the multimeter in the continuity mode. ![]() To check whether the multimeter is appropriately set, place the positive and negative leads on each other. The Ohm setting is the best as it tells you whether the fuse is bad even when the metal string isn’t broken. Now, although the continuity mode is also appropriate for checking whether the metal string is broken or not, it doesn’t provide you with a detailed diagnosis. The 200 Ohm limit is the appropriate range you set the multimeter to, as this is the closest higher range that gives the most accurate result.Īlternatively, you may also set the multimeter to continuity mode, which is usually represented by a soundwave symbol. The Ohms setting is represented by the Omega Symbol (Ω) on the multimeter and, as you will see, also has multiple ranges (2MΩ, 200kΩ, 20kΩ, 2kΩ, and 200Ω). To measure resistance using the multimeter, you turn its dial to the Ohms setting. Testing fuses for faults requires you to test their resistance. You should also be careful while taking the fuse out so you don’t damage it. Regardless, you want to disconnect the power supply before doing this to avoid fatal shock hazards. Of course, how you take the fuse out depends on the electrical circuit, device, or type of fuse it is. ![]() The first step is to take the fuse out of the electrical circuit it is in. We will go into each of these steps, as well as every other important step in detail. ![]() If you get an “OL” reading, then the fuse is bad and needs to be replaced. Set the multimeter to the 200 Ohm range to measure resistance, place the negative and positive multimeter probes on each end of the fuse, and wait for a reading of zero (0) or a value close to zero, which means it is good. The metal string is located inside it, connects these two tabs, and burns out from excess current to prevent electrical flow between them. The most common type of fuse found in various electrical devices is the cartridge fuse, which is cylindrically shaped, usually transparent, and comes with two metal tabs at both ends. The current a fuse may hold is known as its ampere rating, which goes from as low as 10A up to 6000A. They mainly consist of a tiny metal string or wire that melts or “blows” when excess current passes through it. Fuses are simple components designed to protect electrical circuits from power surges or overloads. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |