How can I test them on pcb?
SMD capacitors?
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Re: SMD capacitors?
You test them the same as other caps.
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Re: SMD capacitors?
capacitance meters are designed to test on board...they use low AC frequency
if I remember correctly
of course to be absolutely sure it best to remove, but SMD is a bit of a pain
so best is "If in doubt replace"
(if you dont have proper removal tool 2 irons can do the job)
larger electrolytic type tantalum ones are prone to failure (+ on them in uf range)
smaller ceramic types will mostly probably be ok
but all caps can fail
(and there has be cases of them cracking there ends off due to stress)
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Re: SMD capacitors?
SMD are measured the same as other caps.
If it's in the circuit and there are other caps in parallel either directly or indirectly then in-circuit testing won't work.
- There are usually other capacitances in parallel in-circuit.
That's probably what your problem has been.
Not the meter.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: SMD capacitors?
Originally posted by PCBONEZSMD are measured the same as other caps.
If it's in the circuit and there are other caps in parallel either directly or indirectly then in-circuit testing won't work.
- There are usually other capacitances in parallel in-circuit.
That's probably what your problem has been.
Not the meter.
.Comment
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Re: SMD capacitors?
I don't know what you don't understand.
If there is nothing in parallel then you put a lead on each end and measure it.
If there is something in parallel you remove at least one end from the circuit and do the same thing.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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