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Necessary Things for Using Multimeter

Necessary Things for Using Multimeter

The multimeter is a familiar device to everyone who specializes in the electricity sector. The device provides effective support for electricians and electrical engineers who need to test circuits, measure parameters, and so on.

The multimeter is an electrical measuring instrument with multiple functions. The basic functions include the ammeter, voltmeter, and ohmmeter. Furthermore, this device also can measure the power line frequency, capacitance capacitors, check transistors. Due to the usefulness of the device, many people need to purchase one. However, some people still have trouble finding the best multimeter to buy and understanding how to use it most effectively. This post will help you learn how to select and use a multimeter.

    Photo Credit: Juan Rodriguez

    In fact, the multimeter is quite easy to use. Selection of the unit of measurement and scale can be performed by manipulating the buttons and switches on the device. Moreover, many modern multimeters can automatically select the scale.

    1. Functions of multimeters

    – Checking circuit connections: the machine will beep when the resistance between two probes is nearly equal to 0.

    – Measuring small voltages or amperages when a large resistor is present.

    – Measuring the inductance of the inductor and capacitance of the capacitor when checking and installing electrical circuits.

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    – Checking diodes and transistors.

    – Providing support for temperature measurement using thermocouples.

    – Measuring the average frequency when adjusting a radio circuit. The user would listen to the signal instead of seeing the signal as when using an oscillograph.

    – Saving measurement data in the device.

    2. Advantages and disadvantages of multimeter types: Analog multimeters

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      Advantages

      – Usually preferred for testing whether semiconductor components such as a diode, transistor, or MOSFET are still active or not, because this type of device is easier to use for this task.

      – Can be used to quickly check damaged components in electronic circuits.

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      – Lower price.

      Disadvantages

      – The needles or electronic circuits inside can easily break if the device is not used properly.

      – It can be difficult to read the numeric values for the voltage, current, and resistance.

      – The accuracy is not high.

      3. Advantages and disadvantages of multimeter types: Digital multimeters

        Photo Credit: en-us.fluke.com

        Advantages

        – Easy to read and follow the numerical values displayed on the screen.

        – High precision.

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        – High durability.

        – Can be equipped with more advanced functions, such as measuring frequency or capacitance.

        Disadvantages

        – Expensive.

        – Difficult to use, which could be a problem if the user wants to quickly check whether electronic components are damaged.

        4. How to use a multimeter to measure current and voltage

        Method 1: Use the scale line

        In order to measure the current using a multimeter, you measure the load consumption, but you have to note that you can only measure an electric current lower the value that the scale allows. Next, you follow the steps below:

        Step 1: Set the device on the highest scale line.

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        Step 2: Connect the rods of the device to the load, with the red rod on the positive side and the black rod on the negative side.

        The device will then provide the current values.

        Method 2: Use DC scale voltage

        It is also possible to measure the current through the load by measuring the pressure drop across the resistor in series with the load limit line; the measured voltage divided by the limit value will indicate the current value. This method gives the user the ability to measure larger currents and is also safer.

        To do this, read AC and DC voltage values. When measuring the DC voltage, you must read the value on the DCV.A index bar. If you set 250V for the scale, the highest value measurable is 250. When you are measuring the AC voltage, you must read the values on the AC.10V bar.

        Featured photo credit: mjlorton via youtube.com

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        Angella Copper

        Professor of Hanoi University of Science and Technology

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        Last Updated on December 9, 2019

        5 Simple Ways to Relieve Stress Effectively

        5 Simple Ways to Relieve Stress Effectively

        Everyone experiences mental stress at one time or another. Maybe you’re starting a new career, job, or business, or you feel incredibly overwhelmed between work, parenting, and your love life (or a lack of it). It could even be that you simply feel that you have way too much to do and not enough time to do it,  plus, on top of everything, nothing seems to be going the way it should!

        Yup, we all experience mental stress from time-to-time, and that’s okay as long as you have the tools, techniques and knowledge that allow you to fully relieve it once it comes.

        Here are 5 tips for relieving mental stress when it comes so you can function at your best while feeling good (and doing well) in work, love, or life:

        1. Get Rationally Optimistic

        Mental stress starts with your perception of your experiences. For instance, most people get stressed out when they perceive their reality as “being wrong” in some way. Essentially, they have a set idea of how things “should be” at any given moment, and when reality ends up being different (not even necessarily bad), they get stressed.

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        This process is simply a result of perception and can be easily “fixed” by recognizing that although life might not always be going as YOU think it should, it’s still going as it should—for your own benefit.

        In fact, once you fully recognize that everything in your life ultimately happens for your own growth, progress, and development—so you can achieve your goals and dreams—your perception works in your favor. You soon process and respond to your experience of life differently, for your advantage. That’s the essence of becoming “rationally optimistic.”

        The result: no more mental stress.

        2. Unplug

        Just like you might need to unplug your computer when it starts acting all crazy, you should also “unplug” your mind.

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        How on earth do you unplug your mind? Simple: just meditate.

        It isn’t nearly difficult or complicated as some people think, so, if you don’t already meditate, give it a try. Whether you meditate for 5 minutes, 30 minutes, or 2 hours, this is a surefire way to reduce mental stress.

        Meditation has been scientifically proven to relax your body (resulting in less mental stress), while also reducing anxiety and high blood pressure.

        3. Easy on the Caffeine

        Yes, we know, we know—everyone loves a nice java buzz, and that’s okay, but there’s a fine line between a small caffeine pick-me-up and a racing heart and mind that throws you into a frenzy of mental stress.

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        Try giving up caffeine for a while and see how you feel. And, if that’s completely out of the question for you, at least try to minimize it. You might find that lots of your mental stress mysteriously “disappears” as your caffeine intake goes down.

        4. Attack Mental Stress Via the Back Door

        That’s right: your body and mind are part of the whole being, and are constantly influencing and affecting each other. If you’re experiencing a lot of mental stress, try to reduce it by calming your body down—a calm body equals a calmer mind.

        How do you calm your body down and reduce physical stress? A  great way to reduce physical stress (thereby reducing mental stress) is to take natural supplements that are proven to reduce stress and anxiety while lifting your mood. Three good ones to look into are kava-kava, St John’s wort, and rhodiola rosea:

        • Kava-kava is a natural plant known to have mild sedative properties, and you should be able to find it at your natural health food store or vitamin store. It’s available in capsules or liquid extract form.
        • St John’s wort is a natural flower used to treat depression. Again, it’s found at your local health store in capsules or liquid. Because it uplifts mood (enabling you to see the brighter side of all experiences) it helps relieve mental stress as well.
        • Rhodiola rosea is a natural plant shown to reduce stress and uplift mood, and Russian athletes have been using it forever. Like the other two supplements mentioned, rhodiola rosea can be found at your natural health store in capsule or liquid form.

        While these supplements are all natural and can be very helpful for most people, always check with your health care provider first as they can cause side-effects depending on your current health situation etc.

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        5. Good Old-Fashioned Exercise

        This tip has been around forever because it works. Nothing relieves mental stress like running, kickboxing—you name it. Anything super-physical will wipe out most of your mental stresses once the exercise endorphins (happy chemicals) are released into your brain.

        The result: mental stress will be gone!

        So, if you’re feeling overwhelmed or just plain stressed, try using some of the above tips. You can even print this out or save it to refer to regularly.

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        Featured photo credit: Radu Florin via unsplash.com

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