Multimeters are basically used by people who work with electronics, whose work might involve knowing the exact amount of current passing through a circuit or the potential difference across two poles in an electrical system – could be as simple as the two poles of a battery, or within a complex circuit. All these are embedded feature of good multimeter, commonly known as DMM.If you have bought yourself a new DMM and need to know how to operate that, then we have the exact help for you.
Continuity test ensures that a circuit is running flawlessly. If a wire is meant to connect two nodes together, then putting the probes of a DMM on both ends of the connection would ensure the circuit is continuous or not by sounding an alarm, or more like a continued beep. To begin, make sure your DMM has its red probe connected to the VΩmA port and the black probe to the COM, and touch the pointy ends of the nodes to the nodes on your circuit.
- Voltage Testing
To test the voltage on a circuit or some sort of component like a battery, or capacitor or a live circuit node, rotate the dial on the DMM to select the accurate voltage range and put the red node on the known (+)ve node and black on the ground. However, if you see a negative output on the LCD, apparently you have done wrong polarity. A ‘1’ in display would mean the voltage output is higher than the selected range.
Just take a resistor and put the probes on both sides of the resistor. Since there’s no polarity on resistors, it’s fine whichever way you measure it. Keep your hands off the connections, because skin contact could affect the result.
Place the probes in between a flowing current path and connect the probes according to their accurate flowing direction. Improper range selection could burn the fuse inside, be careful with this process.
These are 4 very basic functions a DMM provides. Good multimeters are easy to operate and typically come in cheap.