Electronics > Beginners
smd capacitor need so help under standing them for part look up!
mikerj:
--- Quote from: sub2001zero on January 17, 2020, 01:56:20 am --- I used a fluke 87v meter on ohm the smd read 8.- m ohm to 17.3 m ohm at the highest point is that right?
--- End quote ---
Do you mean 8-17.3 milliohms, or 8-17.3 Megaohms? Big difference! If you mean millohms then the capacitor is shorted out, which is not uncommon for MLCC capacitors if they have been cracked due to mechanical stress.
The Fluke 298 has a capacitance measurement mode, but if the capacitor is shorted then you won't be able to read the correct capacitance back. If the capacitor is not shorted out and you are able to read it's capacitance, then why do you think the part is bad?
sub2001zero:
I test the cap for a short and has no short.
I show a picture of the tester the M stand for Mega ohm right!
101_6219 by sub2001zero, on Flickr
Jwillis:
A capacitor that is fully charged will read open because of the very high resistance a capacitor has when charged. If want to test capacitor if it is working short the to ends of the cap .Test with an Ohm meter \$\Omega\$ \$\Omega\$ .The resistance will rise as it charges because the meter is applying a voltage during a resistance measurement .Low value caps will charge very fast .To fast to notice the resistance rising. High value capacitors will charge slower. You may even see the resistance rise as they charge. But the resistance will always go to infinite on a fully charged capacitor no matter what value it is . But it won't tell you the value of that capacitor.
If you press the yellow button you should be able to toggle to capacitance testing. The symbol right of the \$\Omega\$ symbol is capacitance.
Why an expensive meter like Fluke doesn't have mode or select written on the mode button baffles me .
mikerj:
--- Quote from: sub2001zero on January 17, 2020, 06:59:05 pm ---I test the cap for a short and has no short.
I show a picture of the tester the M stand for Mega ohm right!
--- End quote ---
Upper case 'M' = Mega
Lower case 'm' = milli
sub2001zero:
Hi everyone thanks for the help I have a quick question. I want to get a good Lcr meter in the next few month. My question I have one of the cheap DIY LCR meter will that read smd cap I never try it! Will this get me by on fix the watch until i get a good one!
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