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How to test a capacitor _ how to test smd capacitors with a multimeter
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00:00:00.030 hi let's talk about how to test a 00:00:03.83000:00:03.840 capacitor there are different kind of 00:00:08.03000:00:08.040 capacitors some of them they have the 00:00:12.77000:00:12.780 shape of disks another slight kind of 00:00:16.48000:00:16.490 pillows and another like cylinders this 00:00:23.48000:00:23.490 ones there are ceramic capacitors and 00:00:25.73000:00:25.740 they have very low capacitance the other 00:00:28.75900:00:28.769 ones they have from low to almost low 00:00:33.47000:00:33.480 capacitance and electrolytic capacitance 00:00:36.67000:00:36.680 capacitors they have very large 00:00:39.04900:00:39.059 capacitance electrolytic capacitors they 00:00:45.31900:00:45.329 have a line marking where the negative 00:00:48.02000:00:48.030 should go the unmarked area is the 00:00:52.16000:00:52.170 positive supposedly it doesn't matter in 00:00:56.15000:00:56.160 the other kind of capacitors but we will 00:00:58.97000:00:58.980 talk about it later when you need to 00:01:02.33000:01:02.340 replace a capacitor what is important is 00:01:05.60000:01:05.610 to replace the same amount of 00:01:07.67000:01:07.680 capacitance in micro firs 00:01:10.24000:01:10.250 the voltage could be the same or could 00:01:12.85900:01:12.869 be higher if the mechanical structure 00:01:15.60900:01:15.619 fits on the place so remember 00:01:20.03000:01:20.040 capacitance must be the same voltage 00:01:22.31000:01:22.320 could be higher or the same one more 00:01:25.64000:01:25.650 important thing about it is the 00:01:33.71000:01:33.720 temperature 00:01:34.79000:01:34.800 the capacity to resist let me see if I 00:01:39.21000:01:39.220 can focus here for this one he says from 00:01:46.13000:01:46.140 minus 40 to 105 degrees Celsius some 00:01:52.38000:01:52.390 capacitors they resist 105 and another's 00:01:56.67000:01:56.680 they work until 85 like this one 40 to 00:02:04.38000:02:04.390 85 degrees Celsius so when you're going 00:02:08.85000:02:08.860 to replace the capacitor always check 00:02:10.68000:02:10.690 the temperature because it matters if 00:02:12.84000:02:12.850 you are going to buy capacitors to keep 00:02:14.69900:02:14.709 it store it for the next time you need 00:02:16.77000:02:16.780 it by the high-temperature ones so you 00:02:19.86000:02:19.870 can use in either case to make timers or 00:02:27.29000:02:27.300 to make pulsing electronic so for 00:02:31.83000:02:31.840 frequency or clocks we use the 00:02:34.59000:02:34.600 combination of any one of this capacitor 00:02:37.22900:02:37.239 with a resistor as higher the resistor 00:02:41.07000:02:41.080 the longer the time it takes to charge 00:02:43.38000:02:43.390 the lowers the faster but from all these 00:02:47.72900:02:47.739 kind of resistors the capacitor sorry I 00:02:51.68000:02:51.690 recommend to use these kind of 00:02:53.75900:02:53.769 capacitors because they have more 00:02:55.47000:02:55.480 precision when we try to make a sequel 00:03:01.89000:03:01.900 for timing so these two guys in 00:03:06.18000:03:06.190 combination of transistors electro 00:03:10.11000:03:10.120 integrated circuits you can make a good 00:03:13.25000:03:13.260 timing system to test 00:03:19.05900:03:19.069 lassiter you will need to remove the 00:03:22.11900:03:22.129 capacitor out of the printed circuit 00:03:24.19000:03:24.200 board one to discharge the capacitor 00:03:30.36000:03:30.370 remove the capacitor from the sequencing 00:03:32.80000:03:32.810 circuit board and discharge the 00:03:34.36000:03:34.370 capacitor and now you are able to make 00:03:36.87900:03:36.889 the measurement of the capacitor with a 00:03:38.83000:03:38.840 capacitance mirror you can use any kind 00:03:41.67900:03:41.689 of device for it there are some very 00:03:44.22900:03:44.239 expensive four thousand six thousand 00:03:46.42000:03:46.430 dollars mine is the cheapest I could get 00:03:49.95900:03:49.969 in the market because my budget was so 00:03:51.69900:03:51.709 small for it did I mention you have to 00:03:55.65900:03:55.669 discharge okay how do we discharge 00:03:59.33900:03:59.349 capacitors like this ones who has no 00:04:01.92900:04:01.939 been in the printed circuit board after 00:04:05.05000:04:05.060 a measurement with a short circuit like 00:04:07.56900:04:07.579 this just another piece of metal between 00:04:10.05900:04:10.069 the two leads and that's it but when we 00:04:14.77000:04:14.780 have capacitors like this ones as 00:04:17.25900:04:17.269 example this is a capacitor for 200 00:04:21.84900:04:21.859 volts probably it was in a sushi power 00:04:24.73000:04:24.740 supply charging being 160 volts or more 00:04:29.96900:04:29.979 - like this one so after connecting this 00:04:37.18000:04:37.190 guy and remove the capacitor you have to 00:04:40.96000:04:40.970 discharge the way to discharge the 00:04:43.24000:04:43.250 capacitor like this is with a resistor 00:04:46.48000:04:46.490 and try to do it before to remove the 00:04:49.42000:04:49.430 capacitor user resists 00:04:53.43900:04:53.449 the holder with your fingers because 00:04:55.29900:04:55.309 sometimes the high voltage will make the 00:04:58.20900:04:58.219 resistor to hit put it some well be 00:05:02.46900:05:02.479 patient until the discharge that's the 00:05:05.86000:05:05.870 way to discharge big guy is like this 00:05:07.65900:05:07.669 and avoid program with step with them 00:05:13.01900:05:13.029 there are no kind of capacitors I will 00:05:16.71900:05:16.729 talk about it in a little while guys 00:05:22.74900:05:22.759 like this there are surface mount 00:05:24.48900:05:24.499 devices and there are little capacitors 00:05:28.26000:05:28.270 as we have them in our tablets laptops 00:05:32.23000:05:32.240 smartphones or any new technology 00:05:35.24900:05:35.259 equipment they are coming in this 00:05:37.92900:05:37.939 presentation they could be high 00:05:40.77900:05:40.789 capacitance to back to capacitors did I 00:05:51.61000:05:51.620 mention that core electrolytic 00:05:55.23900:05:55.249 capacitors we have a market line telling 00:05:58.26900:05:58.279 us where the negative should go and 00:06:00.27900:06:00.289 their mark area is the positive one and 00:06:04.23000:06:04.240 as is saying the other ones it doesn't 00:06:08.73900:06:08.749 matter pay attention to the following 00:06:10.77900:06:10.789 thing this capacitor has a mark is not 00:06:14.98000:06:14.990 an electrolytic capacitor I will tell 00:06:17.37900:06:17.389 you what is it about to make a capacitor 00:06:24.11900:06:24.129 we only need two conductors good one in 00:06:29.17000:06:29.180 the front of the other and now we cut a 00:06:31.38900:06:31.399 capacitor we can also create an 00:06:37.83900:06:37.849 insulation in between and use a 00:06:41.67900:06:41.689 capacitor but capacitors like them they 00:06:45.99900:06:46.009 are material like this roll it and the 00:06:51.73000:06:51.740 outside paper like this one if I roll it 00:06:57.57000:06:57.580 put one little insight on what little 00:07:00.65900:07:00.669 the outside paper will 00:07:04.14000:07:04.150 pick up radio frequency and we just meet 00:07:07.89000:07:07.900 noise to our electronic system many 00:07:12.99000:07:13.000 years ago 00:07:13.59000:07:13.600 farrakhan's they used to mark were is 00:07:17.90900:07:17.919 the outside paper in this lid or this 00:07:20.52000:07:20.530 other one for designers or manufacturers 00:07:23.67000:07:23.680 to know this lid has to go to the chasis 00:07:27.39000:07:27.400 to the ground to the lower impedance in 00:07:30.35000:07:30.360 the audio amplifier and the other one 00:07:34.29000:07:34.300 has to continue with the rest of the 00:07:35.96900:07:35.979 circuit in the load or the higher 00:07:38.49000:07:38.500 impedance in the amplifier or any 00:07:42.06000:07:42.070 electronic circuit that is what is it 00:07:45.60000:07:45.610 about 00:07:56.61000:07:56.620 Simmons once that we discharge the 00:08:00.42000:08:00.430 capacitor and remove the capacitor out 00:08:03.65900:08:03.669 of the printed circuit board is good 00:08:06.03000:08:06.040 always to make a short circuit on it now 00:08:08.52000:08:08.530 with a resistor just with a conductor to 00:08:10.26000:08:10.270 make a total discharge to ensure it is 00:08:14.25000:08:14.260 totally discharged our capacitor is 330 00:08:19.86000:08:19.870 micro first as we say the mark goes to 00:08:23.67000:08:23.680 the negative the other lip goes to the 00:08:27.65900:08:27.669 positive now we have a reading about the 00:08:33.87000:08:33.880 this device capacitance to know if it is 00:08:37.52900:08:37.539 good or is bad let me tell you most 00:08:39.95900:08:39.969 capacitors they could be plus minus 10% 00:08:42.77900:08:42.789 20% if it is in that average is good 00:08:48.86000:08:48.870 another aspect that we have to pay 00:08:51.30000:08:51.310 attention is the following when we have 00:08:57.45000:08:57.460 capacitors in a printed circuit board in 00:08:59.19000:08:59.200 a switching power supplies like these 00:09:00.78000:09:00.790 ones a switching power supply if you see 00:09:04.01900:09:04.029 the surface of these capacitors they 00:09:07.17000:09:07.180 look good healthy but when you see 00:09:11.69900:09:11.709 something like this or this older guy 00:09:14.26900:09:14.279 did you see that the skin let's call the 00:09:18.99000:09:19.000 color scheme is peeling out is because 00:09:22.92000:09:22.930 the capacitor was overheating and the 00:09:26.91000:09:26.920 plastic starts moving away if the top of 00:09:31.05000:09:31.060 the capacitor is inflamed ready to pop 00:09:34.80000:09:34.810 out to explode in another world or they 00:09:38.28000:09:38.290 skim over the way just by that save your 00:09:41.64000:09:41.650 time with a reading and you know you 00:09:43.50000:09:43.510 have a bad capacitor another example 00:09:48.05000:09:48.060 take a look to these guys do you see 00:09:54.72000:09:54.730 this suspicious guy and this order - 00:09:57.05000:09:57.060 okay 00:09:58.48000:09:58.490 they're capacitors who has been 00:10:00.28000:10:00.290 suffering because the temperature there 00:10:09.25000:10:09.260 is a 00:10:10.45000:10:10.460 like this one these other ones they get 00:10:13.24000:10:13.250 in short circuit this kind of capacitors 00:10:16.09000:10:16.100 they could be high capacitance too 00:10:19.29000:10:19.300 sometimes they are connected as whatever 00:10:23.20000:10:23.210 it is it's a pretty secure port but also 00:10:26.26000:10:26.270 there is a chance that one of the inside 00:10:28.90000:10:28.910 is touching the ground and the other is 00:10:32.20000:10:32.210 just continuing in its function whatever 00:10:35.50000:10:35.510 it is in the circuit board so one 00:10:40.81000:10:40.820 techniques to find out if there is a 00:10:43.33000:10:43.340 capacitor in short circuit is at the 00:10:45.82000:10:45.830 fallows number one we will need a 00:10:53.85000:10:53.860 multimeter like this one or like the one 00:11:01.18000:11:01.190 you can get at home and you must put it 00:11:07.48000:11:07.490 in continuity with the beep so you can 00:11:14.59000:11:14.600 hear the beep when you make a short 00:11:18.04000:11:18.050 circuit between the links what are we 00:11:23.26000:11:23.270 going to do is we are going to look for 00:11:27.64000:11:27.650 the ground in that case for me it looks 00:11:31.27000:11:31.280 like a ground where the scroll was and I 00:11:35.50000:11:35.510 will talk both size in the capacitor 00:11:42.86000:11:42.870 you hear this one you produce a beep 00:11:45.19000:11:45.200 that means there is continuity about 00:11:48.14000:11:48.150 zero ohms from here to the ground now 00:11:58.64000:11:58.650 that I know this part touch the ground 00:12:01.09000:12:01.100 the order shouldn't do it if I get a 00:12:04.91000:12:04.920 continuity from the other side to the 00:12:07.07000:12:07.080 ground 00:12:07.49000:12:07.500 that means this capacitor could be in 00:12:09.59000:12:09.600 short circuit or is in parallel with 00:12:11.84000:12:11.850 something that is in short secret if the 00:12:14.99000:12:15.000 capacitor plates in short circuit will 00:12:17.21000:12:17.220 put a big carry of the circuit in short 00:12:19.07000:12:19.080 circuit - so the only way to find out 00:12:22.76000:12:22.770 because I will touch all of them and 00:12:24.44000:12:24.450 they will give it your circuit like this 00:12:27.05000:12:27.060 that is good but it will have continued 00:12:28.97000:12:28.980 in both size I mean these and this other 00:12:31.88000:12:31.890 one theoretically what I have to do is I 00:12:37.67000:12:37.680 will use my soldering iron I will touch 00:12:41.96000:12:41.970 one side of the capacitor and I will 00:12:44.00000:12:44.010 trap is the same way to make a 00:12:46.91000:12:46.920 measurement the only way to make a 00:12:48.94900:12:48.959 measurement remember we can now make a 00:12:50.66000:12:50.670 measurement of capacitors on the board 00:12:53.72000:12:53.730 we have to take it out or at least to 00:12:56.96000:12:56.970 lift up one of the sides if I have a 00:13:02.00000:13:02.010 capacitor in short circuit if it is one 00:13:04.61000:13:04.620 of them as I said probably it will put 00:13:07.25000:13:07.260 the whole array short-circuit so I have 00:13:09.76900:13:09.779 to lift each one of them to see which 00:13:14.48000:13:14.490 one will release the short circuit the 00:13:16.51900:13:16.529 one that released at your circuit you 00:13:18.86000:13:18.870 will touch the other ones and the charge 00:13:22.76000:13:22.770 they will be will be gone but the one 00:13:25.37000:13:25.380 who has the Georgia goodness put us 00:13:27.32000:13:27.330 example this one that is bigger enough 00:13:29.21000:13:29.220 to see it we have continually will 00:13:31.55000:13:31.560 continue with a continue to bolt size 00:13:34.60000:13:34.610 let's watch the following video about 00:13:37.79000:13:37.800 how to remove one of the sides of the 00:13:40.91000:13:40.920 capacitor with a soldering iron 00:14:50.46000:14:50.470 you 00:15:20.07900:15:20.089 there is a lot to study about capacitors 00:15:22.29900:15:22.309 don't use YouTube to learn when you 00:15:25.26900:15:25.279 think you have to know the best source 00:15:27.73000:15:27.740 still be in the books and out of the 00:15:31.05900:15:31.069 books I recommend you always go to study 00:15:33.97000:15:33.980 get formal education there is a lot you 00:15:37.38900:15:37.399 need to know go for it it's worthy it 00:15:40.74900:15:40.759 will pay you back things by watching it
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