Loud popping sounds, burning smells, or sparks - if you notice any of these, then your electric outlet might be screaming for help.
Last week while working in the garage, my husband noticed a strange burning smell in the garage. Panicking, he rushed inside the house and asked me to call an electrician for an inspection.
Sadly, no one was willing to show up on such short notice. Therefore, I decided to call my father to ask him for help. That’s when my father informed me that the sparks might be due to a short circuit.
However, he wasn’t sure of it, and suggested I get a multimeter. Next, he told me the steps that I must follow to find the short circuit. Within an hour or so, we detected the short circuit in the garage.
So, I decided to put together a guide on how to find a short circuit with a multimeter. Howdy! I’m Stacy Smith, and today I’m back with yet another interesting guide just for you.
So, without further ado, let’s get straight into the deets.
How To Find A Short Circuit With A Multimeter
Finding a short circuit is a pretty daunting task. When you hear strange popping or buzzing sounds from the circuit, I suggest you don’t ignore them. Of course, I’m sure you don’t want accidents to occur.
So, the best thing to do is to try to locate a short circuit to avoid any further damage to the circuit. But, first off, you’ll have to get a multimeter. Read on to know how to find a short circuit with a multimeter.
Step 1: Shut Off The Power Supply
When I set myself on the mission to find a short circuit, I first turned off the power supply. That’s what my dad advised me to do and I suggest you do the same. This will ensure your safety and will let you work without worry. To be on the safe side, use a multimeter to check whether the power supply is properly turned off or not.
Step 2: Take Your Multimeter And Set It To Continuity Or Resistance Mode
Next, I took a multimeter and set it to continuity or resistance mode. Although I used a digital multimeter, you can use an analog one if you want.
To set it to continuity mode, you will have to adjust the setting through the selector knob. However, you must remember that not all multimeters feature both continuity and resistance parameters. So, if you have a multimeter without a continuity feature, you can adjust it to resistance.
Although there is a range of settings available for resistance, I suggest you go for the lowest one. While using the multimeter, if you get two different ohms at the end of both the wires, there’s a short.
Step 3: Check The Probes
Before you begin with your mission of finding a short circuit, check whether the multimeter is functioning correctly or not. First, test the probes by touching the tip together and keep an eye on the continuity and resistance reading.
If you notice the resistance reading is zero, then the multimeter is working just fine. Also, If your multimeter is set to continuity, there will be a bright spark and some buzzing sound.
However, not all multimeters follow the same approach to testing continuity. Make sure you check the user manual and go through different ways of testing continuity readings.
Step 4: Find The Affected Circuit
After adjusting the multimeter to resistance mode, find the circuit component that needs to be tested for a short. At times, knowing the short isn’t challenging, only if you pay attention to its signs. For instance, popping sounds or sparks igniting from the outlet let you know there’s a short.
Step 5: Place The Probe Tips Into The Circuit
After you’ve located the short, you will have to insert the probe tips into the circuit. Most multimeters feature two probes - a red and a black probe.
What you should do is take the black one and press it to the electrical chassis. Next, take the red one and press it to that part of the circuit where a short circuit has occurred. However, keep in mind that the tips of the two probes must touch the metal portion of the circuit.
Step 6: Pay Attention To The Display Of The Multimeter
While you’re pressing the black and red probes to two separate parts of the circuit, keep an eye on the display of the multimeter.
If the monitor displays a reading near zero or about 2 ohms, know that there is a short circuit in the machine you’re testing. However, if you notice high resistance, then know there’s an open circuit.
Alternatively, if you’re using a multimeter in a continuity setting to check for shorts, then it will produce beeping sounds or flashing lights to let you know there’s a short.
Step 7: Repair The Shorts
Now that you know the location of the short, it’s time to repair it. At times, replacing or insulating wires will help you fix the short. Shut off the power supply and then begin working to prevent accidents.
However, I suggest you do so only if you’re experienced enough to handle the electronic outlets. Otherwise, hire an electrician to get the job done.
- Additional Tips - The following incorrect operations may cause the multimeter not to show results: Firstly, the plugs of test leads are not fully inserted or not inserted into the correct sockets. Secondly, the manual rotary switch is not placed in the correct position. In addition, this meter can not test all AC Current and below 100mV AC Voltage. Please check the user manual carefully before measurement.
- Versatile Digital Multimeter - Accurately measures AC/DC Voltage, DC Current, Resistance, and Diode. This Multimeter is a really useful tool for solving industrial and household electrical issues. Suitable for Household Outlets, Fuses, Batteries (including Vehicles), Automotive Circuit Troubleshooting, Charging Systems, Testing electronics in Cars etc.
- Troubleshooting with Accuracy - This Multimeter has a sampling speed of 2 times per second; Built-in a backlight LCD display with 3 ½ digits (1999 count) 0.6”, and high polarity including negative and positive readings.
- VERSATILE FUNCTIONALITY: Measures AC/DC voltage up to 600V, 10A DC current, 2MΩ resistance; additional features include continuity, diode test and battery test
- LEAD-ALERT PROTECTION: LEDs on the meter illuminate to indicate proper test lead placement, enhancing accuracy and safety during measurements
- BACKLIT DISPLAY: LCD shows clear readings in low-light conditions for enhanced visibility
Final Words
Well, I’ve finally reached the end of my guide. Needless to say, finding a short circuit isn’t challenging at all. You just need to follow the steps correctly.
Moreover, make sure you choose the correct multimeter for your needs. If you aren’t confident enough to detect a short circuit all by yourself, calling an expert is certainly a wise decision. Not to forget, make sure you follow safety measures.
With that, I shall sign off now. I hope this guide was helpful enough to let you detect a short circuit with a multimeter. Let me know your thoughts in the comments below.
Until then, take care and stay safe!