![]() ![]() In this case we can see that our resistor has a value of 220 Ohm.ĭantte said:The example for measuring voltage is incorrect! The display will show the resistance of the resistor. Touch the black probe to the other end of the resistor.ĥ. It doesn’t matter which end, resistors have no polarity and so current can flow in either direction.Ĥ. Touch the red probe to one end of the resistor. Manual multimeter users will need to set the correct range.ģ. Set the multimeter to measure resistance (Ω). Remove the 220 Ohm resistor from the test circuit.Ģ. Resistors are not affected by polarity so it doesn’t matter which way around you connect the probes.ġ. Again the multimeter probes need to be in the voltage configuration and then you simply place a probe on either component lead of a resistor and the display should settle to give you a resistance reading. You can decode these color bands to tell you the resistance value and the tolerance value of that resistor.Īn auto ranging multimeter can be very useful in identifying the value of a resistor. Larger through hole style resistors have a color code system where there are bands of different colors printed onto the component package. Resistors come in all shapes and sizes and also come in a huge range of values and it’s important to pick the right one for each project. Both look quite similar but the key difference is that to use a manual range multimeter you need to roughly know the order of magnitude of the target you wish to measure as the multimeter has predefined ranges selectable by switches. That insulation is there to protect you! Using a Manual Multimeter to read a DC voltageĭigital multimeters tend to fall into two basic camps: manual range multimeter and auto ranging multimeters. For low voltages these are relatively safe, but never remove insulation from a probe designed for high voltage use. ![]() On some probes we can remove the covers, exposing the thin metal tip of the probe. Insulation right up to the tip is safer when probing your project, but might make the probe thicker and harder to access tight spaces. ![]() Probes can come with different amounts of insulation. Additional probes can be purchased quite easily via Amazon or electronic resellers. Other useful probes include micro hook probes which allow you to clip a probe onto a component lead and then not have to hold the probe, or similarly some probe wires have simple crocodile clips on the end of them. These standard probes are perfectly adequate for the majority of uses, but you may opt for a model with additional useful probes. The tips are placed in contact with your circuit or component to take a measurement or perform a test. The most common probes bundled with a multimeter have a plastic body and metal pointed tips. Multimeters have a set of test probes that plug into sockets on the main body of the multimeter. A fold out stand will enable the multimeter to be used on a desk. A backlight is often useful, making the display easier to read. It’s worth considering a few extra features when choosing a multimeter. Continuity testing will be the most useful feature on your multimeter. Continuity testing is useful when checking for any solder bridges or points on a circuit that shouldn’t be connected. We can easily check this by selecting the option and touching the probes together. Confirming that there is a connection between the probes via an audible beep, or LED light. It checks for continuity between two points in a circuit. A continuity test is a very useful tool.We can use this to test LEDs (Light Emitting Diodes) before placing them into a circuit. The multimeter sends a little voltage through the diode, and displays the voltage drop on the screen. The diode test feature enables us to check the status of a diode.If these markings are hard to read, or misprinted we can use the multimeter’s resistance test function, Ω to check the value. Measuring resistance: Resistors, components which restrict the amount of current that a component can consume, use a color coded system to identify their values.Most multimeters will need one of the probes to be inserted into the corresponding port, and remember to swap them back when done. Some more precise models can measure microamps or lower. Most multimeters will be able to measure milliamps and Amps. Current is measured in Amperes, commonly referred to as Amps. Measuring current, the flow of electronics in an electrical circuit, is another basic but important feature of a multimeter.Sources of DC voltages can be batteries, laptop power supplies and solar cells. But do not use your multimeter with high voltage AC outlets unless you know what you are doing. In a normal household environment, the most likely source of AC voltages is your outlets. Measuring voltages is one of the most basic features of a multimeter and we can measure AC V⏦ and DC V⎓ using the same probes and multimeter. ![]()
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