Ohms vs. Continuity for HVAC techs

Рет қаралды 100,000

Күн бұрын

I have heard HVAC technicians express confusion around using the Ohms scale or the continuity feature of their meters. This video will help HVAC techs identify the difference between Ohms and Continuity and when to use one over the other.
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Пікірлер: 60

@zachosborne6577 Жыл бұрын

Been in hvac since 2009 and a journeyman since 2012. I appreciate these basic simple tips and information. Thanks man.

@georgebigras9757 Ай бұрын

Tankyou

@sergiofranco7381 3 жыл бұрын

Thanks for the thorough explanation and examples of what to use them on. One more gold nugget in my bank.

@billminckler6550 Жыл бұрын

Excellent. Thank you for the distinction. Thank you for the alert that some pathways have a higher resistance! 👏

@Suicaedere666 2 жыл бұрын

This was an incredible video, 👏🙌. I thank-you very much for taking the time to create this video, as well as all of your other videos😀🙌❤

@michaelcostello6991 2 жыл бұрын

Great discussion about this topic.

@offgrid2010 3 жыл бұрын

Excellent video. Yes I could hear other sounds but not you speaking. My volume was fine on a previous youtube video. Thank you for excellent content.

@jasonjohnsonHVAC Жыл бұрын

Use alligator clips when possible to ohm out a circuit or component. If you press hard or not hard enough....your reading will vary.

@jodystradesstuff5048 Жыл бұрын

What I wish you'd said was: "Continuity just tests Ohms and beeps if it's under about 50 ohms."

@MuhammadKhan-gs9ym 16 күн бұрын

Thank you for the explanation!

@raymond3722 3 жыл бұрын

Thank's for that clarification.

@robburke8867 Жыл бұрын

Thanks friendly. That was a darn good video. Bravo 👏

@PUBHEAD1 Жыл бұрын

Thanks soooo much for this. Much appreciated

@mjmjersey 2 жыл бұрын

Great video thank you

@thepitpatrol Жыл бұрын

Thank you.

@dammo361 Жыл бұрын

great video,,,thank you

@1953beckley Жыл бұрын

I want to ask you if you can made a video on ohms that's not making a beep. Thanks Dennis

@milanlipovic7349 3 жыл бұрын

Great content again but I wish you would have also used a Fieldpiece meter 👍

@andrewthacker114 2 жыл бұрын

Thanks

@dayannodarse3948 8 ай бұрын

Best explanation Thanks a lot 🙏

@hvacservicementor 7 ай бұрын

You are welcome

@samwikiwiki3231 Жыл бұрын

Guten Abend das Gerät kaputt machen Thanks allot .....great teacher...salute ....

@samwikiwiki7420 2 жыл бұрын

Good work bro. Don’t know why some didn’t like. Any way keep on Guten Abend

@sincityhvacr 3 жыл бұрын

great video do u have any tips on getting better reading rtu schematics and ladder diagrams ? thank you

@hvacservicementor 3 жыл бұрын

You bet! Go to www.hvacservicementor.com and get Electrical Schematics under the Techflix tab. That's a great start. The boot camp courses are also great resources.

@donnierobertson3088 3 жыл бұрын

Nice

@jamalbenthall151 2 жыл бұрын

Great video

@hvacservicementor Жыл бұрын

Thanks!

@genekastner8086 3 жыл бұрын

Eric great informative video - volume very low and hard to hear

@afghvacr Жыл бұрын

Imagine you are on call with senior tech Diagnosing a bad compressor and ask this question 🤣

@Googlename699 Жыл бұрын

When I measure ohm by fluke, it starts with a big number then goes down to a number. Why it does that? (e.g starts with 315.7 ohm then decrement down to 150 ohm)

@1971omi 2 жыл бұрын

Hello I'm hvac tech. Can't find the answer for resistive load such as heat strip. As you said there is high value on resistance on it such as hot surface ignitor so question is if voltage value stays the same based on ohm law amperage gets lower if high resistance but in heat strip we have higher resistance value at the same our amperage drawn is higher which just contradiction to OHM law. I'm senior tech and train lots of technicians but can't find answers for t this?

@rodgraff1782 Жыл бұрын

As a heat strip warms up, it’s resistance will increase. There is really no way to measure resistance on a live circuit. Any conductor will increase its resistance as the temperature of the wire increases. The molecules get farther apart with heat, and cause this rise. You could prove this by using a torch to heat the strip heater element while an ohmmeter is connected. The hotter the element gets, the higher the resistance will be. Hope this helps.

@stevenzavalajr8081 3 жыл бұрын

How do u know how many ohms you should get when checking for ohms?

@hvacservicementor 3 жыл бұрын

That's a challenge which limits the overall value of measuring ohms at all. If you can compare your part to a known good unit, that can be helpful. Some compressor manufacturers publish ohm values, but they can be hard to find. Check out my class on electric motors to learn how to ohm out motors at www.hvacservicementor.com

@rodgraff1782 Жыл бұрын

Motors should be tested for grounds with a meggohmmeter. I have several hand crank styles that can put out 1000volts to ground. They will pick up high resistance grounds that an ohmmeter can’t find, because it tests the motor with its running voltage or higher. It will cause near shorts to arch to ground, therefore testing the integrity of the winding insulation. A meter with a 9 volt battery can’t find these types of defects.

@essiemae8043 3 ай бұрын

would be nice if you showed where you were putting your probes ...

@jp040759 Жыл бұрын

Toning a circuit is a carry over from Telephone repairmen tech terminology.

@louisvanniekerk7667 2 жыл бұрын

I can not get into your website, you need a username and password. Can you help? Louis

@hvacservicementor Жыл бұрын

Website was in transition go to hvactraining.squarespace.com/

@raphaelm6149 Ай бұрын

My multimeter does not beep when testing ohms ..

@wd8557 3 жыл бұрын

I ohm everything period, I only use continuity to check for breaks in wiring or short to ground. If I am working on something bigger, motor's 25 hp and above that cost thousands of dollars, I am not trusting any meter with a 9volt battery. It's time to break out the Megger 420/2

@rickybailey7123 Жыл бұрын

continuity and ohms so continuity is ohms when u put the meter in continuity mode it just beeps and shows ohms that's crazy I didn't know that

@jakem117 3 жыл бұрын

Ah but is a contactor technically a load or a switch? I argue it's both by design. It's a load, that actuates a switch or set there of. Most text books specify it as a switch or control only. If we really dig into it, it is most definitely a load as well. Ever try and install high current rated contractors in a residential split system with the same voltage coil? Some transformers are incapable of maintaining the same potential difference through the coil as its electrical requirements are greater... Now the real question... Non positive displacement compressors... I.E: Centrifugals. How are they even compressors BY DEFINITION? ;) They're not

@oilandfireguy1739 4 ай бұрын

It's definitely a load that activates a separate switch. If the coil wasn't a load, it would short.

@bobb.6393 2 жыл бұрын

Need stereo on voice

@dickfranco4312 11 ай бұрын

so, what is wrong with the circuit ???

@brianbiggs3484 2 жыл бұрын

👍👍✌️🇨🇦✌️🇨🇦✌️🇨🇦👍✌️

@Davidsavage8008 Жыл бұрын

If you can NOT get a steady reading of numbers on your meter when reading a coil on a contactor , I guarantee you that contactor is bad.

@Epicscrewdriver45 Жыл бұрын

Video notes : 1) Ohms measures resistance 2) continuity meant to see if a switch is “open” or “closed” Examples: Ohms -> compressor Motor

@JoeWere 28 күн бұрын

My right ear feels lonely.

@9bboy0lukk36 13 күн бұрын

Ok so it wasn’t just me lol

@knockitofff 3 жыл бұрын

god damn it, it's 2021, get a microphone that records in stereo, captain troubleshooter

@atefe5330 2 жыл бұрын

Hes high

@joehead1294 3 жыл бұрын

Continuity is a trickster and I'll tell you why. Some meters will only read to a certain value and above that they will give O.L. when you still have continuity. Surprised you left that out. I don't trust it of use it. Spec sheets often don't give the range of operation. You have to 'test' your meter to find it's values. Course that's part of knowing your equipment.

@hvacservicementor 3 жыл бұрын

Joe, thanks for your input. On a manual ranging meter, continuity is also the lowest scale range of the meter. If the resistance of the load you are checking is higher than that scale, you will get OL. 200 ohms is common. Beepers will stop sounding around 40 ohms. Some meters may be less. Like you said, you never know what you're going to get. I like the "trickster" description. Very true.