1 00:00:01,590 --> 00:00:02,640 Hello. 2 00:00:02,700 --> 00:00:06,240 Today we will learn about measuring resistance 3 00:00:09,750 --> 00:00:12,960 when the Volt o meter is used to measure resistance. 4 00:00:13,230 --> 00:00:19,340 What actually is measured is a small voltage and current applied to the component. 5 00:00:19,350 --> 00:00:25,780 There are five ranges and out of resistance reading will indicate a single one digit. 6 00:00:25,890 --> 00:00:35,610 Remember k means multiple the reading by 1000 operating voltage should be removed from the component 7 00:00:35,670 --> 00:00:36,990 under test. 8 00:00:36,990 --> 00:00:44,250 Or you could damage the Volt or meter at worst all the reading could be false at best. 9 00:00:45,790 --> 00:00:52,450 When measuring these tunnels there is a small voltage supplied by the meter to energize the controller 10 00:00:53,460 --> 00:00:54,680 the red blob. 11 00:00:54,980 --> 00:01:02,270 Lead would have the Positive voltage the Volt on the measure the voltage and current flowing through 12 00:01:02,270 --> 00:01:11,150 the component and the resistance is calculated using arms low which will be converted later. 13 00:01:11,260 --> 00:01:18,970 You can go through the five ranges 200 hundred read up to two hundred ohms two thousand will read up 14 00:01:18,970 --> 00:01:30,760 to 2000 ohm twenty K will lead up to to twenty thousand on and two hundred K will read up to two hundred 15 00:01:30,760 --> 00:01:42,300 thousand ohm while 2000 K read up to two million on or two mega on if their power is removed from the 16 00:01:42,300 --> 00:01:43,090 circuit. 17 00:01:43,260 --> 00:01:47,010 There is little danger that the Volt arm could be damaged. 18 00:01:48,420 --> 00:01:53,100 So you need to remove the ball before starting the test. 19 00:01:53,100 --> 00:01:56,040 Now let's look at an example. 20 00:01:56,040 --> 00:01:59,630 Measuring resistance disconnect the battery from the ball. 21 00:01:59,640 --> 00:02:01,790 Remember to measure resistance. 22 00:02:01,890 --> 00:02:09,010 The Circuit should be unbound both the hundred on resistor in place no additional wires are required. 23 00:02:09,360 --> 00:02:18,210 Select the 200 range and touch the prob leads to either side of that is a store it will read ninety 24 00:02:18,810 --> 00:02:21,370 eight point zero. 25 00:02:21,390 --> 00:02:27,900 Now if we looked here this set of flares the prob leads and observe the reading. 26 00:02:28,320 --> 00:02:31,070 As you can see there is no difference. 27 00:02:31,110 --> 00:02:35,850 It's the same reading ninety eight point zero. 28 00:02:35,910 --> 00:02:47,590 So this means that there is a store doesn't have ability and you can measure at any of these sides. 29 00:02:47,600 --> 00:02:54,280 Now let's take another example where we can discuss those solution using the hundred on the store. 30 00:02:54,320 --> 00:02:57,570 This measure of resistance using each of the other ranges. 31 00:02:57,650 --> 00:02:59,580 This is the two hundred two thousand. 32 00:02:59,750 --> 00:03:12,980 As you can see 0 8 9 and in 2k at 1 taking as you can see zero point one zero the two hundred K zero 33 00:03:12,980 --> 00:03:16,550 zero point one the 2000 case zero zero zero. 34 00:03:16,640 --> 00:03:24,280 So it's like out French and we can't possibly measure that there's a store which is 100 on using that 35 00:03:24,280 --> 00:03:25,820 all mega on a scale. 36 00:03:25,850 --> 00:03:30,500 This will be seriously wrong and we won't get a value. 37 00:03:30,620 --> 00:03:37,760 Not that the solution of their eating decreases as the maximum on reading increase down to the point 38 00:03:37,760 --> 00:03:44,190 where it is difficult to get a good resistance reading which is in this example. 39 00:03:44,230 --> 00:03:55,660 Now if we look at another example as you can see here using the one killer on the stores and the 200 40 00:03:55,670 --> 00:04:00,800 range this is what we get. 41 00:04:00,870 --> 00:04:04,230 We used one kilo arm which is 1000 all. 42 00:04:04,390 --> 00:04:07,730 A much larger than 200 on the end. 43 00:04:07,920 --> 00:04:17,130 So uh it's a blade one which means that that is uh everything that is out of range. 44 00:04:17,170 --> 00:04:21,470 We must find the appropriate range to measuring the one kilo arm. 45 00:04:21,670 --> 00:04:29,680 So if we use the two thousand on reading it will give us nine hundred eighty four. 46 00:04:29,770 --> 00:04:39,010 As you can see here which is the best resolution for measuring the one kid or so you must choose the 47 00:04:39,010 --> 00:04:41,050 resolution wisely. 48 00:04:41,230 --> 00:04:49,020 Otherwise you will get you will get error or you won't get an accurate result. 49 00:04:49,090 --> 00:05:03,070 And this will let's say that this will damage your calculations because you must choose the right resolution. 50 00:05:03,080 --> 00:05:12,020 So you need to try different resolutions to get the best value with as minimum as possible. 51 00:05:12,090 --> 00:05:16,920 Zeros in the left side and in that case the two thousand. 52 00:05:16,980 --> 00:05:24,770 The trick for us now you think you're on the 100 kilometers a store first that amount appropriate range 53 00:05:24,770 --> 00:05:26,840 to use for each resistor. 54 00:05:26,870 --> 00:05:30,410 Second make the resistance measurement. 55 00:05:30,500 --> 00:05:36,550 Third using higher ranges to predict the reading and confirm your prediction by taking damage. 56 00:05:37,340 --> 00:05:39,630 This is a good practice that you should do. 57 00:05:39,950 --> 00:05:42,290 And these are really simple. 58 00:05:43,280 --> 00:05:49,240 Let's say a really simple steps that you can apply now. 59 00:05:49,790 --> 00:05:50,510 Just for fun. 60 00:05:50,510 --> 00:06:00,220 Use the volt meter to measure the resistance of all your different body parts the voltage and current 61 00:06:00,220 --> 00:06:05,920 used by the Volt o meter is not dangerous so you can measure that this that resistance through your 62 00:06:05,920 --> 00:06:13,210 body discuss your observations and how your measurement techniques could influence the readings you 63 00:06:13,240 --> 00:06:19,040 get from the Volt o meter and I think that this is a really fun example. 64 00:06:19,100 --> 00:06:28,420 Practice blobs across individual finned finger or read around one point it make it on probes held between 65 00:06:28,420 --> 00:06:37,960 thumbs and finger one in each hand will measure one point for go on props form the skin on the ankle 66 00:06:38,140 --> 00:06:47,800 and skin on the hand will get you a scale of breathing dry skin vs. moist skin dry one may get warm 67 00:06:47,860 --> 00:06:57,950 moist 96 scale or on lightly touching it probs compared to a free up grasp onto probs light is one may 68 00:06:57,950 --> 00:07:07,150 go home while firm is 300 kilo on the point here is that body contact with the blobs during measurement 69 00:07:07,180 --> 00:07:15,640 can influence the o meter reading and should be avoided practice particularly when measuring high values 70 00:07:15,730 --> 00:07:25,030 of resistance you can bring this up again and try it yourself at home you will know that once you touch 71 00:07:25,030 --> 00:07:30,040 the two blobs it will display resistance so you need to avoid direct contact with the resistance when 72 00:07:30,040 --> 00:07:40,420 measuring it since the this will damage your reading or give you a false reading so please take care 73 00:07:40,420 --> 00:07:50,160 of this very important note when using the volt meter or digital multimeter to measure resistance. 74 00:07:50,170 --> 00:07:51,130 Thanks for watching. 75 00:07:51,130 --> 00:07:52,870 This is education and engineering team.