How to use a multimeter to test a power supply

how to use a multimeter to test a power supply

How to Manually Test a Power Supply With a Multimeter 2021

Feb 24,  · Connect the negative probe on the multimeter (black) to any ground wired pin and connect the positive probe (red) to the first power line you want to test. The pin main power connector has + VDC, +5 VDC, -5 VDC (optional), +12 VDC, and VDC lines across multiple pins. Testing a power supply manually with a multimeter is one of two ways to test a power supply in a computer. A properly executed PSU test using a multimeter should confirm that the power supply is in good working order or if it should be replaced. These instructions apply to a standard ATX power supply.

When you troubleshoot a user's PC, don't forget to test the power supply with a multimeter. Learn some easy-to-follow techniques to help you rule out the possibility that the power supply has gone bad. It may seem unlikely, but over a quarter of all PC problems are in spuply way related to trouble with the power supply. Power-supply problems can also cause lockups, unexpected reboots, and intermittent boot problems.

So before you begin, make sure you have a thorough understanding of how to use your multimeter. Using it incorrectly could result in your receiving a strong electric shock, or it could destroy your multimeter. Typically, supplyy power supply converts the AC into a volt, 5-volt, or 3. The volt direct current is used to power devices with motors, such as hard drives and CD-ROM drives.

The 5-volt and 3. The main difference between the two is the number of connectors attached to the wires. But regardless of which type of power supply you're working with, there are some basic components that apply to all power supplies. The first is the power how to get rid of cuts from cutting, which is where the power supply connects to the electrical outlet. Uuse is the motherboard power, which is delivered via a set of cables running from the power supply.

Power supplies also have a fan which you can troubleshoot easily by just looking at it to see if it's working. Testing the power connection To begin the diagnostic process, verify that the PC is unplugged from the wall and is receiving no power. Next, check the suplpy selector on the back of the PC near the fan to make sure that it is in the volt position. You can see an example of this in Figure A. Figure A Make sure that the power supply is set to volts. Figure B Be careful! Your best bet to avoid electrocution is to attach the multimeter to an unplugged power strip and then plug the power strip into the wall outlet.

Figure C Perform a continuity test on the PC's power cord. Figure E This is the layout of the P1 connector. Figure F Connect the red probe to a yellow wire and the black probe to a black wire. Editor's Picks. Ten Windows 10 network commands everyone one should know. MXLinux is the most downloaded How do you put something on ebay to sell desktop distribution, and now I know why.

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How to Test Power Supply of PC

Jan 04,  · In order to test the power supply with a multimeter, the following steps should be followed: First of all, ensure your own safety before trying to diagnose a power supply. For this purpose, use safety gloves as insulation to avoid any mishap with electricity, like a Author: Natasha Lyons. Oct 14,  · In this youtube video tutorial I show you how to test a psu with a multimeter or how to test a power supply unit using a digital multimeter. This is an adva. 1. Make sure the power cord is plugged properly. 2. Set the multimeter to D/C to check the D/C voltage of the PSU. 3. There are two methods to plug the probes: Connect either red or black probe to the yellow and black connectors. Plug either red or black probe into .

Thank you for supporting the work I put into this site! Power supply failure is one of the most common problems faced by PC users. A faulty power supply is not easy to detect because it cannot be monitored through any software and the fault can be diagnosed by testing only.

It can get further difficult to detect the fault when the power supply is turning on but one of the voltage rails is not functioning properly and giving out improper voltages, which is quite dangerous and can cause damage to your internal components. So, to help you out on this matter, here I will tell you how to test a power supply for any errors or failure to make sure that your PSU is working properly or not.

Hold the pin or pin connector in such a way that the connector clip is facing up and the pins toward you. Now count the fourth and fifth pin from the top-left of the connector. Insert a paper clip, solid copper wire, or small wire in the 4 th and the 5 th pin you have located. This still indicates that the PSU is functioning normally. Below is such a power supply jumper adapter and it supports both pin and pin connectors. The jumper method can only tell you that the PSU is powering up but it does not tell you whether all the voltage rails are functioning properly and the connectors are outputting proper voltages.

So, to test the voltage rails and connectors, you have to use the below-mentioned methods. You can use a basic and inexpensive multimeter to check the PSU rails by measuring the voltages across various connectors of the power supply.

It is also used to check the connectors of the PSU and whether they are outputting proper voltages. If the voltage levels are significantly lower or higher than the reference then it may cause damage to the components connected to the PSU.

To test the various connectors and voltage rails, you have to know the connector pinout diagram and wire color coding for different voltages to get the reading on the multimeter. First, connect the Red lead of the multimeter to the Red wire pin of the Molex connector and Black wire to any ground wire of the Molex connector.

If it is working fine then your multimeter will show a voltage at around 12V with a slight variation. Using the same principle or procedure, you can check other PSU connectors by following the Pinout diagrams of the connectors. Below are the Pinout diagrams of various connectors of the PSU. The voltage reading should not deviate too much from the reference or specified voltage output of the rail e.

The same thing is applicable for other rails that include 5V and 3. The Intel Standard for different Voltage Rails are shown below:. Generally, a power supply tester has a small LCD screen attached to it that shows you the voltage output on all the Rails. Generally, Power good values are often considered abnormal if detected lower than ms or higher than ms for the most power supply testers available in the market today.

If you are looking for a power supply tester from a well-known and reputable brand then Thermaltake Dr. Power II is what you should buy. It is also of the best power supply testers available in the market. If you are getting a 0 ms value, then it means the power supply is dead and not functioning. The device has built-in output connectors diagnostic system, low-voltage, high-voltage, no voltage, PG alarm systems to notify you of any errors, instability, or abnormal behavior with the power supply.

Buy Thermaltake Dr. A generic power supply tester with a metal body made of aluminum alloy. It comes with a 1. To use the device, just insert the pin or pin and P4, P6, or P8 plug into the corresponding position of the power tester. If the values of each group do not flash, it indicates that the power input of this power supply is normal. If the voltage signal of a circuit is not detected such as a pin or pin connector or the detected voltage exceeds the normal range, the buzzer will send out a warning sound for a long time.

If the corresponding voltage or PG value display status is flashing, it means that the power supply is at fault. If the light is not ON, it indicates that the interface line group is faulty. You can download its free version from the link given below. Note: OCCT stress test tool puts a lot of stress on your components and if you are not sure on how to use it then it may cause damage to your components and may fry them if they could not handle the stress over the running period of the test.

If you have queries regarding the power supply testing or troubleshooting then you can ask them in the comment section below. I have done M. Tech in IT and B. Notify me by email when the comment gets approved. How To Guides. Related Posts. Leave a Reply Cancel reply Notify me by email when the comment gets approved.

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5 thoughts on “How to use a multimeter to test a power supply”

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