Learn how to use multimeter and take full advantage of the tool. It measures resistance, voltage, and current. Most of them can, but some also check for continuity, beeping when nothing is loose, and things are connected electrically. The feature is useful when soldering, connecting wires or building a circuit. Learn more about how an MM works and how to use it correctly.
How to Use Multimeter
Check here on how to use an MM to perform your task efficiently and safely.
Voltage is the measurement of how hard the electricity is pushed through your circuit. It is measured in volts (V).
Current is the measure of the electricity flowing through the circuit. Higher of it means there is more electricity flowing. The measurement is amperes expressed in A.
Lastly is the resistance that determines how hard it’s for electricity to pass or flow through a circuit. Getting a higher resistance measurement means it’s harder for the power to flow. Ohm is the symbol of resistance.
Switch off the wiring or circuitry tested if possible shorting out of adjacent terminals, wires or points possessing different voltages. Next, start plugging the probe into the black ground into the COM socket. Then, plug in the red positive probe leads to the V socket (marked with omega and a symbol for the diode).
If your MM has auto-ranging features, just turn its dial to V having the AC or DC symbol. On the other hand, set the dial AC or DC and choose a range of desired accuracy if using a manual MM.
Make sure that the MM is in parallel connection to check for voltage. Check for two test probes connected with the source of the V, load or two points. Connect the black probe to the first point of the wiring or circuitry. Switch the electronic device or equipment.
Connect the red probe to the second testing point. See that you’re not bridging the space between the adjacent wiring, tracks or terminals, and the testing point.
Get the reading on the multimeter display.
According to Den Garden, you must switch the power off when measuring main voltage before you connecting the probes. Alternatively, switch to the neutral first.
Switch the power of the circuitry or wiring that is tested. Insert the MM in series with the load in your circuit to check for current. Connect the multimeter’s ground probe into the socket for COM.
Next, connect the red probe lead into the high current socket or mA socket. The mA socket has the max current mark. Use the 10A socket if you’re estimating a higher value. If not, you’re going to blow a fuse.
Connect the MM in series. If the probe is in a 10A socket, turn the meter’s dial to 10A range or the highest current range. Switch on the power. Turn to lower value range for an accurate reading if the scale is high. When done, get the positive probe back to the V socket. Otherwise, the MM will be damaged – blown up or with blown up fuse.
Switch the circuit power off. Make sure to disconnect an end of resistance from it. This action may involve de-soldering a component or by pulling off the spade lead. There can be other resistances parallel with the tested resistance.
Next, switch to the lowest Ω or ohm range, such as 200 ohms. Put the tip of the probe at every end of the tested resistance.
The display shows “I” when the resistance is higher than what can be indicated on the setting of the range you’ve chosen. If so, switch the dial to an upper range next to what you have picked earlier. Repeat until you get a value.
According to the Family Handyman, you should match the probes’ polarity to the positive and negative terminals of the direct current source tested when checking for amps or DC voltage. On the other hand, you don’t need to do it if testing for amps or AC V as well as for resistance or continuity.
Get correct readings by holding the tip points of the probe to the contact. However, do not touch the metal tips, or you will get incorrect readings because your body will act as a “circuit.” It will also get you zapped.
Cleaning the oxides off the probes and maintaining sharp points using emery cloth or sandpaper is maintenance for accurate readings.
Refer to this guide on how to use a multimeter for the best results today!