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Old 05-13-2009, 16:10   #1 (permalink)
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Question how to check capacitor?

how to check capacitor with digital multimeter?
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Old 05-13-2009, 18:44   #2 (permalink)
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Quote:
Originally Posted by srikanthreddy View Post
how to check capacitor with digital multimeter?
You can use your multimeter as an ohmmeter to test the capacitor.

1) Discharge the capacitor by shortening its leads. That is - use a wire and connect the leads of the capacitor together. This will discharge it.

2) put your multimeter in the high ranges 10K-1M

3)CONNECT MULTIMETER TO CAPACITOR LEADS(OBSERVE THE POLARITY IF ELECTROLYTIC). AT SOON AS THE LEADS MAKE CONTACT, THE METER WILL SWING NEAR ZERO. IT WILL THEN MOVE SLOWLY TOWARD INFINITY. FINALLY THE METER WOULD COME TO BE INFINITE OHMS BECAUSE THE CAPACITOR IS BEING CHARGED BY THE BATTERY OF THE MULTIMETER.

4) IF THE CAPACITOR IS BAD, IT WILL GO TO ZERO OHMS AND REMAIN THERE. THIS IS CALLED A SHORTENED CAPACITOR

5) IN THE CASE OF AN OPEN CAPACITOR THERE WILL BE NO OHMMETER INDICATION.

6)SOME CAPACITORS HAVE A LOW DIELECTRIC LEAKAGE. YOU WILL KNOW THIS IF THE OHMMETER COMES TO REST AT A POINT LOWER THAN INFINITE. TEST A KNOWN GOOD CAPACITOR OF THE SAME TYPE TO BE SURE .

This method will work with sufficiently large capacitor values.
A simple way of determining the capacitance fairly accurately is to build an oscillator using a 555 timer. Substitute the cap in the circuit and then calculate the C value from the frequency. With a few resistor values, this will work over quite a wide range.

Alternatively, using a DC power supply and series resistor, capacitance can be calculated by measuring the rise time to 63% of the power supply voltage from T=RC or C=T/R.

Tiny capacitors can only be checked with a capacitance meter, or by using them in an AC circuit and checking for variation from calculated voltage drop.

Last edited by loca|host; 05-13-2009 at 18:50.
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Old 05-22-2009, 20:30   #3 (permalink)
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Quote:
Originally Posted by loca|host View Post
You can use your multimeter as an ohmmeter to test the capacitor.

1) Discharge the capacitor by shortening its leads. That is - use a wire and connect the leads of the capacitor together. This will discharge it.

2) put your multimeter in the high ranges 10K-1M

3)CONNECT MULTIMETER TO CAPACITOR LEADS(OBSERVE THE POLARITY IF ELECTROLYTIC). AT SOON AS THE LEADS MAKE CONTACT, THE METER WILL SWING NEAR ZERO. IT WILL THEN MOVE SLOWLY TOWARD INFINITY. FINALLY THE METER WOULD COME TO BE INFINITE OHMS BECAUSE THE CAPACITOR IS BEING CHARGED BY THE BATTERY OF THE MULTIMETER.

4) IF THE CAPACITOR IS BAD, IT WILL GO TO ZERO OHMS AND REMAIN THERE. THIS IS CALLED A SHORTENED CAPACITOR

5) IN THE CASE OF AN OPEN CAPACITOR THERE WILL BE NO OHMMETER INDICATION.

6)SOME CAPACITORS HAVE A LOW DIELECTRIC LEAKAGE. YOU WILL KNOW THIS IF THE OHMMETER COMES TO REST AT A POINT LOWER THAN INFINITE. TEST A KNOWN GOOD CAPACITOR OF THE SAME TYPE TO BE SURE .

This method will work with sufficiently large capacitor values.
A simple way of determining the capacitance fairly accurately is to build an oscillator using a 555 timer. Substitute the cap in the circuit and then calculate the C value from the frequency. With a few resistor values, this will work over quite a wide range.

Alternatively, using a DC power supply and series resistor, capacitance can be calculated by measuring the rise time to 63% of the power supply voltage from T=RC or C=T/R.

Tiny capacitors can only be checked with a capacitance meter, or by using them in an AC circuit and checking for variation from calculated voltage drop.
how to check capacitors in mobile?same way or different way
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Old 05-22-2009, 20:48   #4 (permalink)
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Tiny capacitors can only be checked with a capacitance meter, or by using them in an AC circuit and checking for variation from calculated voltage drop.
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Old 05-23-2009, 13:52   #5 (permalink)
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Best way is to chek whit ESR-meter..and whit capacitor meter! Whit digital multimeter is difficult..best is analogic multimeter! First you need to see if is in shortcut!!
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Old 05-26-2009, 22:52   #6 (permalink)
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use analog meter then ushold be able to check
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Old 01-07-2012, 02:44   #7 (permalink)
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check capacitor

Quote:
Originally Posted by srikanthreddy View Post
how to check capacitor with digital multimeter?

How to use an LCR Meter - YouTube
I hope this helps you LCR Meter
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Old 01-09-2012, 13:32   #8 (permalink)
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Originally Posted by marwan007 View Post
How to use an LCR Meter - YouTube
I hope this helps you LCR Meter
I hope this picture can help you.
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File Type: jpg date.jpg (28.7 KB, 240 views)
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Old 01-16-2012, 00:43   #9 (permalink)
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Forum for all and not for you alone

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I hope this picture can help you.

This forum for all

Can benefit people in the future from this participation

You seem to not understand the usefulness of this Forum

Say something useful this topic. Or Hist .
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Old 02-15-2012, 09:09   #10 (permalink)
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how to check multimeter
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Old 02-16-2012, 17:21   #11 (permalink)
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A Simple Way to Test Capacitors.

http://ucokmonalisacom.blogspot.com/...citorhtml.html
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