How to test a run and start capacitor

Рет қаралды 133,417

Bigmacbricky

9 жыл бұрын

Testing a run capacitor and a start capacitor.

Пікірлер: 23

@Son_Of_Scotland 5 жыл бұрын

Simple straightforward! Thank you sir!

@anttonasensio4300 7 жыл бұрын

thanks mate very useful .

@larryjones5884 7 жыл бұрын

nice job you kept it simple. Very. Very well done

@bigmacbricky4866 7 жыл бұрын

larry jones cheers!

@andreamitchell4758 7 жыл бұрын

15 quid pretty good so can this cheap meter also test in circuit? also what is the name of it id like to order one

@jorgeolivera2627 Жыл бұрын

Morning i wanted to knw if a boat lift capacitor can be replace wit a compresor capacitor or jus a regular lift capacitor

@nickgc1234 6 жыл бұрын

Hi there I have the same as in your vid but when i take the reading I get nothing no reading at all does this mean both are no good? Nick

@nickgc1234 6 жыл бұрын

they are of a compressor that starts but when its full the motor cant or wont turn over to recharge .it start first of when no presure is in it . if theses are gone why would it start first to charge the tank? .

@dustinpool 3 жыл бұрын

So would a reading of 6.8 be to low for a 7.5 uf 370 vac run capacitor ? There is no info about a 5% difference. I have a rv ac that hums when I turn on , I can spin and it will run for a while then slow down and stop., I tested start capacitor and it's new and within spec.,

@RC-Heli835 7 жыл бұрын

Thanks for sharing my friend. Hey how do I tell which is start and which is run. Our shop air compressor has 3 capacitors. It doesnt like to start under a load. Or wont start I should say.

@bigmacbricky4866 7 жыл бұрын

Start capacitors will have a much higher capacitance than run capacitors

@sangarp2001 7 жыл бұрын

i opened my washer and got a capacitor. It shows uF and also micro henry. Why micro henry is stated on it?

@benjets9345 2 жыл бұрын

How do I hook up 2 start capacitors on a Lima dual voltage motor 120/220 motor

@rapidrabbit7175 3 жыл бұрын

Thanks Scotty.

@bigmacbricky4866 3 жыл бұрын

Paddy not Scotty 😎👍🏻

@RC-Heli835 7 жыл бұрын

Ok Ive identified the start cap. All 3 read correctly in cap test mode on my multimeter. And in ohms mode the 2 other caps got a quick readind and went to infinity. After a few reads though they quit reading ohms only infinity. Are they both bad?

@SimpleEnough2k9 7 жыл бұрын

Performing readings on a capacitors while your multimeter is in the ohms/resistance mode/scale, won't really tell you if the capacitor has the right capacity (uF wise) but could potentially indicate if there is a short. When using the multimeter in ohms/resistance mode, the multimeter actually applies a small voltage to the device connected to the probes and measures the resulting current. What you see on your meter is actually a visual representation of that current. By nature, discharged capacitors will behave like a short (very small resistance) and present more and more resistance to the current flow as they charge. When they're fully charged or reach the source voltage, in this case the voltage applied by the multimeter to measure the resistance, the capacitor doesn't allow anymore current to flow, thus your meter is showing a very large resistance (pretty much infinity). If you discharge the capacitor, by connecting a resistor or possibly shorting the pins for few seconds, you could repeat the steps you did, taking multiple reading while in the ohm/resistance mode, and you will pretty much end up with the same results which indicates that the capacitor(s) are charging and keeping their charge. If you let the capacitor discharge by itself, without shorting the leads that is, and take another reading at a later time, this could help you qualitatively determine how good the capacitor is capable of keeping its charge. If the capacitor keeps its charge adequately, you should be able to make another reading some time later and the reading should be very close to infinity. If the resistance is low then increases afterwards, that would indicate that there is some current leakage, potentially indicating that the capacitor needs to be replaced. Once again, this approach isn't perfect, but when you actually understand what's going on behind the scene, it's easier to troubleshoot in a more efficient way.