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  1. #14
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    Jan 2006
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    McQueeney, Texas
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    3,801
    Quote Originally Posted by Damien View Post
    Whats the "Ohms test"?

    Dont think I have heard this term.


    Some folks will turn the meter to "Ohms" then touch the leads together to see that the meter is working and that's fine, but checking with actual voltage is much safer. What if the dial or switch quit working in volts (VAC) setting?

  2. #15
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    18,260
    Using voltage to test a DVOM is the only reliable test before using it as a voltage testing tool. It is the only way you can have a reasonable chance of finding no voltage on a terminal when the DVOM says there is none. A DVOM can and will fail by showing a big fat "0" on the display, and it is more than willing to do so when the processing circuit in the device has failed. This can lead to your most important tool telling you that a circuit is de-energized, when in fact, it is not. The result can be death.

    Test with a known live circuit, then use the meter to show you when a circuit is safe to handle.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  3. #16
    Join Date
    Sep 2011
    Location
    Canada NB
    Posts
    32

    ohms test

    Quote Originally Posted by Damien View Post
    Whats the "Ohms test"?

    Dont think I have heard this term.
    ohms test is the resistance in anything ex resister,,,light bulb so you do not have an electrical short or overcurrent you need resistince to electrical flow that resistance is measured in ohms

  4. #17
    Join Date
    Sep 2011
    Location
    Canada NB
    Posts
    32
    Yes ok thanks Talkowags

  5. #18
    Join Date
    Apr 2002
    Location
    Omaha, NE
    Posts
    1,561
    Quote Originally Posted by Dog1 View Post
    Any general tips on using meters in the field. I'm in tech school studying the electrical part and not getting it yet. Just curious on any advice I can get. Thanks.
    Dog1....why don't you tell us what "studying the electrical part and not getting it" means. If you tell us specifically what you're not understanding maybe we can help to explain the electrical fundamentals that aren't clear. Troubleshooting with a meter won't make any sense to you unless you understand the fundamentals.
    B.O. = B.S.

  6. #19
    Join Date
    Jun 2005
    Location
    Winston-Salem NC
    Posts
    1,133
    OoO.

    Yeah , it is that frickin important.
    Order of Operation

    Knowing what the heck you are supposed to be seeing when, is far more important than the rest of the "advice" spewed so far.

    Best meter, cheapest meter, WTFE.

    Question is, do you know what you should be reading at "x" point?
    If you do, then GTFO here and go make some money.
    If not, ask your instructor.

  7. #20
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    18,260
    Quote Originally Posted by stonewallred View Post
    OoO.

    Yeah , it is that frickin important.
    Order of Operation

    Knowing what the heck you are supposed to be seeing when, is far more important than the rest of the "advice" spewed so far.

    Best meter, cheapest meter, WTFE.

    Question is, do you know what you should be reading at "x" point?
    If you do, then GTFO here and go make some money.
    If not, ask your instructor.
    Spewed. What a colorful character. We may have a new t3weezy.

    Dog1, get that app in for Pro membership, and you will have access as a Pro to our extensive educational section, where you can review the basics of electricity and troubleshooting.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  8. #21
    Join Date
    Jul 2011
    Location
    Central PA
    Posts
    177
    I always carry my Fluke non contact voltage tester in my back pocket along with my Klein hvac 11 in 1 (has a nifty core removal bit) and my multi tool on my belt. For the general "no ac" call, that's enough to get the jist of what's going on before you break out the arsenal. The non contact is a quick way of following the sequence of operation to point you in the right direction, if the problem is electrical.
    Last edited by infinitend; 09-04-2011 at 09:04 PM.
    "Good judgement comes from experience. Experience comes from bad judgement."

  9. #22
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    18,260
    Quote Originally Posted by infinitend View Post
    I always carry my Fluke non contact voltage tester in my back pocket along with my Klein hvac 11 in 1 (has a nifty core removal bit) and my multi tool on my belt. For the general "no ac" call, that's enough to get the jist of what's going on before you break out the arsenal. The non contact is a quick way of following the sequence of operation to point you in the right direction, if the problem is electrical.
    Your avatar shows my most frequent no-refrigeration service call in retail stores. I love it.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  10. #23
    Join Date
    Mar 2006
    Posts
    1,028
    be careful when check voltage on a loose lead, cant tell you how many time ive had a lead on a wire, somehow i moved my lead just enough for the metal on the lead to arch on a metal cause.. it'll get your heat going thats for sure

  11. #24
    Join Date
    Jul 2011
    Location
    Locust Grove, Ga
    Posts
    60

    Thanks again.

    Thanks again guys for the general electrical advice. I don't know enough to get to specific, maybe something like how to check if a capacitor is bad or not would be helpful. I'm trying to get my post count up so I can study more educational stuff. My instructor is really smart but he's so busy with so many students it's hard to get one-on-one time. I'm really disapointed with the whole tech school scene. It's just a big business trying to churn people out for money., but I have got to get my diploma/degree.You still get out of it what you put in but I've made up my mind to teach myself as much as possible.

  12. #25
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    18,260
    Good idea. You will do well, because you have taken the initiative to learn.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  13. #26
    Join Date
    Feb 2010
    Location
    Ontario Canada
    Posts
    1,341
    Get a meter with a "cat 3" or better rating, it will save your life. I have taken to wearing those gloves that have been dipped in rubber on the hand but open cotton on the back. Keeps the hands dry, and I feel a lot better reaching in to get readings...... On three phase stuff always read from the out side legs first and move slowly with the meter probes, that is the last place you want to arc something out and maybe cause a corona. Also, wear safety glasses !
    Never give up; Never surrender!

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