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    00:00:03
    [Music]
    00:00:09
    hey what's happening guys you know what
    00:00:12
    today we're going to talk about
    00:00:13
    resistance and reading resistance that
    00:00:16
    is very low
    00:00:18
    say it less than an ohm well it can be
    00:00:21
    done and it's not hard to do it can be a
    00:00:24
    bit more tricky than reading you know
    00:00:27
    resistance that is higher than an ohm so
    00:00:30
    let's get this meter here and for
    00:00:37
    instance here is a 10 watt 10 ohm power
    00:00:42
    resistor and we'll connect it up to the
    00:00:46
    leads and we're seeing what ten point
    00:00:50
    four ohms okay I mean that's quite
    00:00:54
    believable right but then if we connect
    00:00:57
    our leads together you know we're seeing
    00:01:03
    point 1 4 ohm resistance just from our
    00:01:07
    leads so it adds a little bit of
    00:01:11
    uncertainty into our measurements now
    00:01:15
    here is a six-foot long piece of
    00:01:19
    stranded 22 gauge wire say we want to
    00:01:23
    know the resistance of it so I put it
    00:01:28
    here in the meter and let it measure it
    00:01:31
    and we get 0.27 ohms
    00:01:38
    now this meter is a 10,000 count so it's
    00:01:42
    you know it's got decent resolution and
    00:01:46
    that's probably in the ballpark for this
    00:01:49
    but you know it doesn't give me any
    00:01:51
    confidence in the measurement and again
    00:01:53
    we have the resistance of the leads and
    00:01:56
    the reason I'm doing this is because I'm
    00:02:00
    gonna do a video coming up here and the
    00:02:02
    next week or so about test leads are
    00:02:08
    these are the leads that came with this
    00:02:09
    aining meter you know they're totally
    00:02:12
    no-name Chinese
    00:02:14
    and then here's the O one meter with its
    00:02:21
    unbranded Chinese ium leads here is a
    00:02:27
    set of unity leads and here is a set of
    00:02:37
    fluke
    00:02:38
    leads and I'm gonna order a set of probe
    00:02:43
    master leads as well and we're gonna see
    00:02:46
    how the different qualities of leads
    00:02:50
    make a difference but I guarantee you
    00:02:54
    even with the shittiest of the
    00:02:56
    leads the resistance is going to be well
    00:02:59
    under Nome it's going to be well under
    00:03:00
    half an improperly if it's over a half
    00:03:02
    of them then wow that's really really
    00:03:05
    bad so we need to measure with
    00:03:08
    confidence a low resistance and even
    00:03:12
    with a good meter it's kind of hard to
    00:03:14
    do so what we're gonna need to do is
    00:03:18
    take a four wire measurement and it's
    00:03:22
    not hard not hard at all what we're
    00:03:26
    gonna have is a constant current source
    00:03:30
    and our resistor or in this case wire or
    00:03:36
    leads and our costs and current source
    00:03:43
    we're going to set for one volt at one
    00:03:48
    milliamp no I'm sorry one volt at ten
    00:03:52
    milli amp one volt at ten million and
    00:03:56
    then all we need to do is to come over
    00:04:00
    here
    00:04:02
    and measure the voltage drop across that
    00:04:08
    resistor and if we do that we now have
    00:04:13
    all the information necessary to bring
    00:04:18
    in our old friend Ohm's law you're
    00:04:25
    familiar with the Ohm's law triangle I
    00:04:26
    hope if you're not you should learn it
    00:04:29
    so V equals I times R well we know I we
    00:04:34
    know V we don't know R so then R equals
    00:04:40
    V over I and then we can figure it out
    00:04:46
    by measuring our voltage drop right here
    00:04:50
    now if you have a high-end bench meter
    00:04:54
    it probably has the capability to do a
    00:04:57
    four wire measurement also called a
    00:04:59
    Kelvin measurement but if you don't have
    00:05:02
    such a meter and I don't hear another in
    00:05:05
    the home office so to speak you can do
    00:05:10
    it with two multimeters and a power
    00:05:14
    supply so that's what we're gonna do
    00:05:16
    here we're going to bring in the O one
    00:05:21
    meter for our ammeter
    00:05:26
    we're going to bring in the 8008 to
    00:05:32
    measure our voltage drop and off-camera
    00:05:36
    I have my bench power supply set for 1
    00:05:40
    volt at point 1 milliamp so here's how
    00:05:46
    we're going to hook it up here is our
    00:05:47
    wire our device under test from the
    00:05:51
    power supply to the wire from the wire
    00:06:03
    to the input I'm going to make sure I
    00:06:09
    don't get my cables mixed up here to the
    00:06:14
    input of our ammeter and the output from
    00:06:25
    our amp meter goes back to the power
    00:06:32
    supply so now if I turn this on to
    00:06:36
    milliamps let me turn out that light out
    00:06:41
    of there now if we adjust this as close
    00:06:45
    as we possibly can to 10 power supplies
    00:06:49
    a little bit touchy
    00:06:55
    and then we will bring in trying to get
    00:07:04
    my hands on this we will bring in our
    00:07:06
    other meter to read the voltage drop so
    00:07:08
    I'm just gonna clip this on right here
    00:07:11
    put that guy on voltage we will adjust
    00:07:15
    this as closely as we can again to ten
    00:07:18
    milliamps come on settle down all right
    00:07:31
    and we'll take a reading of our voltage
    00:07:34
    here and we have a drop of 1.2 but
    00:07:42
    millivolts so we bring back in the piece
    00:07:50
    of papel and we know that resistance
    00:07:56
    equals voltage which is point zero one
    00:08:03
    two divided by I which is point one and
    00:08:11
    then grab the old calculator and we say
    00:08:16
    point zero one two divided by 0.1 equals
    00:08:26
    0.12 or 12 millions so now we know with
    00:08:35
    more confidence that 12 milli ohms is
    00:08:40
    the resistance of that piece of wire our
    00:08:46
    device under test and now we will be
    00:08:49
    able to when we have all of these meter
    00:08:51
    leads at hand the test each of these
    00:08:56
    meter leads see which one offers the
    00:08:58
    least resistance which will mean it will
    00:09:01
    give us the best readings for voltage
    00:09:08
    well it'll give us the best readings
    00:09:09
    throughout the range of readings on the
    00:09:12
    meter it will be the best quality test
    00:09:14
    leads that we can get now I'm gonna
    00:09:17
    predict that the unity ones will be the
    00:09:21
    crappiest and either the fluke or the
    00:09:26
    probe master ones will be the top but
    00:09:28
    you know we will have to wait until
    00:09:30
    those probe master ones come in and I
    00:09:32
    imagine they'll be here in a couple days
    00:09:35
    so probably by the end of the week we'll
    00:09:37
    have it anyway that's it for this video
    00:09:40
    I hope you guys enjoyed this in you
    00:09:42
    learned a little something about how
    00:09:44
    absolutely simple it is to do a four
    00:09:47
    wire measurement if you have any
    00:09:50
    questions post them down below comment
    00:09:52
    share don't forget to subscribe I'm out
    00:09:55
    of here
    00:09:56
    peace
    00:10:02
    [Music]

    Description:

    Get professional PCBs for low prices from www.pcbway.com --~-- In an upcoming video we are going to characterize meter test leads to find out which ones give the best performance. In order to not have an extra long video, we look at how to do a four-wire resistance measurement in this video.

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