## Thursday, October 19, 2023

How To Test A Capacitor With A Multimeter (Step-By-Step)

In this video, we show 3 methods on how to test a capacitor with a multimeter. The first method refers to the resistance test of the capacitor, the second is about the capacitance test, and the last one is about the voltage test.

8 Ways to Check and Test a Capacitor with a DMM and AMM (AVO)

In most electrical and electronics troubleshooting and repairing works, we face a common problem with capacitors where we want to know how to test and check a capacitor? Is it good, bad (dead), short or open?

Here, we can check a capacitor with analog (AVO meter i.e. Ampere, Voltage, Ohm meter) as well as digital multimeter Either the capacitor is in good condition or we should replace it with a brand new one.

Note: To find the value of Capacitance, you need an analog or digital multimeter with capacitance measuring features.

Below are eight (8) methods to check & test that a Capacitor is Good, Defective, Open, Dead, or Short.

Related Posts:

How to Test a Diode using Digital & Analog Multimeter – 4 Ways.

How to Test a Relay? Checking SSR & Coil Relays

How to Measure Capacitance using Multimeter

Method 1.

Test a Capacitor using Digital Multimeter – Resistance Mode

To test a capacitor by DMM (Digital Multimeter) in the Resistance “Î©” or Ohm mode, follow the steps given below.

Make sure the capacitor is fully discharged.

Set the meter on the Ohmic range (Set it at least on 1000 Ohm = 1kÎ©).

Connect the multimeter probes to the capacitor terminals (Negative to Negative and Positive to Positive).

Digital multimeter will show some numbers for a second. Note the reading.

And then immediately it will return to the OL (Open Line) or infinity “∞”. Every attempt of Step 2 will show the same result as shown in steps 4 and 5. It means that Capacitor is in Good Condition.

If there is no change, then Capacitor is dead.

Related Posts:

Testing Electrical and Electronics Components and Devices with Multimeter

How to Check a Transistor by Multimeter (DMM+AVO) – NPN & PNP – 4 Ways

Method 2.

Check a Capacitor using Analog Multimeter – Ohm Mode

To check a capacitor by AVO (Ampere, Volt, Ohm Meter) in the Resistance “Î©” or Ohm mode, follow the following steps.

Make sure the suspected capacitor is fully discharged.

Take an AVO meter.

Rotate the knob on the analog meter to select the resistance “OHM” mode (Always, select the higher range of Ohms).

Connect the Meter leads to the capacitor terminals. (COM to the “-Ve” and Positive to the “+Ve” terminals).

Note the reading and compare with the following results.

Short Capacitors: Shorted Capacitor will show very low resistance.

Open Capacitors: An Open Capacitor will not show any movement (Deflection) on the OHM meter scale.

Good Capacitors: Initially, it will show low resistance, and then gradually increases toward the infinite. It means that the capacitor is in good condition.

Method 3.

Checking Capacitor using Multimeter in the Capacitance Mode

Note: Testing a capacitor in the capacitance mode can only be performed if the analog or digital multimeter has the farad “Farad” of Capacitance “C” features. The function of capacitance mode in a multimeter can also be used to test the tiny capacitors. To do this, rotate the knob of the multimeter to the capacitance mode and follow the following basic instructions.

Make sure the capacitor is fully discharged.

Remove the capacitors from the circuit board.

Now Select Capacitance “C” on the multimeter.

Now connect the capacitor terminal to the multimeter leads. (Red to Positive and Black to Negative).

If the reading is close to the actual value of the capacitor (i.e. the value printed on the Capacitor container box).

Then the capacitor is in good condition. (Note that the reading may be less than the actual value of the capacitor (the rated value of capacitor due to the tolerance in ±10 or ±20).

If you read a significantly lower capacitance or none at all, then the capacitor is dead and you should change it with a new one for proper operation.

Testing a Capacitor By Simple Voltmeter

To apply this method on polar and nonpolar capacitors, you must know the value of nominal voltage of capacitors. The level of voltage is already printed on the nameplate of electrolytic capacitors. While there are specific codes printed on ceramic and SMD capacitors. You may follow this guide which shows how to read and find the value of ceramic and non-polarized capacitors with related codes printed on it.

Also, you can use the DC Voltage “V” or Volt Mode in the digital or analog multimeter to perform this test.

Make sure to disconnect a single lead (no worries if Positive (long) or negative (short)) of the capacitor from circuit (You may fully disconnect as well if needed)

Check the capacitor voltage rating printed on it (As shown in our below example where the voltage = 16V)

Now charge this capacitor for a few seconds to the rating (not to the exact value but less than that i.e. charge a 16V capacitor th 9V battery. If the value of battery voltage is greater than the nominal voltage of the capacitor, it will damage or burst the capacitor.) voltage. Make sure to connect the positive (red) lead of the voltage source to the positive (long) lead of the capacitor and negative to negative. If you are not sure or unable to find the proper leads, here is the tutorial on how to find the negative and positive terminal of a capacitor.

Set the value of the voltmeter to the DC voltage and connect the capacitor to the voltmeter by connecting the positive wire of the battery to the positive lead of the capacitor and negative to negative. You can use a digital or analog multimeter while selecting the DC voltage range for the same purpose.

Note the initial voltage reading in the voltmeter. If it is close to the supplied voltage you gave to the capacitor, the Capacitor in is in Good condition. If it shows far less reading, Capacitor is dead then. Note that the voltmeter will show the reading for a very short time as the capacitor will discharge its stored volts in the voltmeter.

How To Test A Capacitor With A Multimeter (Step-By-Step)

In this video, we show 3 methods on how to test a capacitor with a multimeter. The first method refers to the resistance test of the capacitor, the second is about the capacitance test, and the last one is about the voltage test.

8 Ways to Check and Test a Capacitor with a DMM and AMM (AVO)

In most electrical and electronics troubleshooting and repairing works, we face a common problem with capacitors where we want to know how to test and check a capacitor? Is it good, bad (dead), short or open?

Here, we can check a capacitor with analog (AVO meter i.e. Ampere, Voltage, Ohm meter) as well as digital multimeter Either the capacitor is in good condition or we should replace it with a brand new one.

Note: To find the value of Capacitance, you need an analog or digital multimeter with capacitance measuring features.

Below are eight (8) methods to check & test that a Capacitor is Good, Defective, Open, Dead, or Short.

Related Posts:

How to Test a Diode using Digital & Analog Multimeter – 4 Ways.

How to Test a Relay? Checking SSR & Coil Relays

How to Measure Capacitance using Multimeter

Method 1.

Test a Capacitor using Digital Multimeter – Resistance Mode

To test a capacitor by DMM (Digital Multimeter) in the Resistance “Î©” or Ohm mode, follow the steps given below.

Make sure the capacitor is fully discharged.

Set the meter on the Ohmic range (Set it at least on 1000 Ohm = 1kÎ©).

Connect the multimeter probes to the capacitor terminals (Negative to Negative and Positive to Positive).

Digital multimeter will show some numbers for a second. Note the reading.

And then immediately it will return to the OL (Open Line) or infinity “∞”. Every attempt of Step 2 will show the same result as shown in steps 4 and 5. It means that Capacitor is in Good Condition.

If there is no change, then Capacitor is dead.

Related Posts:

Testing Electrical and Electronics Components and Devices with Multimeter

How to Check a Transistor by Multimeter (DMM+AVO) – NPN & PNP – 4 Ways

Method 2.

Check a Capacitor using Analog Multimeter – Ohm Mode

To check a capacitor by AVO (Ampere, Volt, Ohm Meter) in the Resistance “Î©” or Ohm mode, follow the following steps.

Make sure the suspected capacitor is fully discharged.

Take an AVO meter.

Rotate the knob on the analog meter to select the resistance “OHM” mode (Always, select the higher range of Ohms).

Connect the Meter leads to the capacitor terminals. (COM to the “-Ve” and Positive to the “+Ve” terminals).

Note the reading and compare with the following results.

Short Capacitors: Shorted Capacitor will show very low resistance.

Open Capacitors: An Open Capacitor will not show any movement (Deflection) on the OHM meter scale.

Good Capacitors: Initially, it will show low resistance, and then gradually increases toward the infinite. It means that the capacitor is in good condition.

Method 3.

Checking Capacitor using Multimeter in the Capacitance Mode

Note: Testing a capacitor in the capacitance mode can only be performed if the analog or digital multimeter has the farad “Farad” of Capacitance “C” features. The function of capacitance mode in a multimeter can also be used to test the tiny capacitors. To do this, rotate the knob of the multimeter to the capacitance mode and follow the following basic instructions.

Make sure the capacitor is fully discharged.

Remove the capacitors from the circuit board.

Now Select Capacitance “C” on the multimeter.

Now connect the capacitor terminal to the multimeter leads. (Red to Positive and Black to Negative).

If the reading is close to the actual value of the capacitor (i.e. the value printed on the Capacitor container box).

Then the capacitor is in good condition. (Note that the reading may be less than the actual value of the capacitor (the rated value of capacitor due to the tolerance in ±10 or ±20).

If you read a significantly lower capacitance or none at all, then the capacitor is dead and you should change it with a new one for proper operation.

Testing a Capacitor By Simple Voltmeter

To apply this method on polar and nonpolar capacitors, you must know the value of nominal voltage of capacitors. The level of voltage is already printed on the nameplate of electrolytic capacitors. While there are specific codes printed on ceramic and SMD capacitors. You may follow this guide which shows how to read and find the value of ceramic and non-polarized capacitors with related codes printed on it.

Also, you can use the DC Voltage “V” or Volt Mode in the digital or analog multimeter to perform this test.

Make sure to disconnect a single lead (no worries if Positive (long) or negative (short)) of the capacitor from circuit (You may fully disconnect as well if needed)

Check the capacitor voltage rating printed on it (As shown in our below example where the voltage = 16V)

Now charge this capacitor for a few seconds to the rating (not to the exact value but less than that i.e. charge a 16V capacitor th 9V battery. If the value of battery voltage is greater than the nominal voltage of the capacitor, it will damage or burst the capacitor.) voltage. Make sure to connect the positive (red) lead of the voltage source to the positive (long) lead of the capacitor and negative to negative. If you are not sure or unable to find the proper leads, here is the tutorial on how to find the negative and positive terminal of a capacitor.

Set the value of the voltmeter to the DC voltage and connect the capacitor to the voltmeter by connecting the positive wire of the battery to the positive lead of the capacitor and negative to negative. You can use a digital or analog multimeter while selecting the DC voltage range for the same purpose.

Note the initial voltage reading in the voltmeter. If it is close to the supplied voltage you gave to the capacitor, the Capacitor in is in Good condition. If it shows far less reading, Capacitor is dead then. Note that the voltmeter will show the reading for a very short time as the capacitor will discharge its stored volts in the voltmeter.