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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

      Photo Credit: stratomory

      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 October 16, 2018

        The Ultimate Guide to Help You Sleep Through the Night Tonight

        The Ultimate Guide to Help You Sleep Through the Night Tonight

        It’s well past midnight and you’ve got to get up in less than six hours. You toss and turn all night. Before you know it, another hour passes by and you start panicking.

        If I don’t get to sleep in the next 30 minutes, I’m going to be exhausted tomorrow!”

        One thing is for sure, you’re not alone. Over 70M+ Americans have stated that they don’t get the proper sleep they need at night.[1] So what could possibly be causing this insomnia epidemic?

        Throughout my entrepreneurial journey of building my language learning company, I have experimented and researched dozens of best sleep practices. Some have flopped but a few have dramatically improved the quality of my life and work.

        In this article, I’ll look into the reason why you’re sleep deprived and how to sleep through the night tonight.

        Why you can’t sleep through the night

        The first step to improving anything is getting to the bottom of the root problem. Different studies have shown the reasons why most people cannot sleep well at night.[2] Here are the main ones that the average person faces:

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        Stress

        If you’ve ever stayed up at night worrying about something, know that it’s a major sleep inhibitor. When you’re feeling stress, your mind and body becomes more activated, making it incredibly difficult to fall asleep. Even when you do manage to sleep, it won’t be deep enough to help you feel rested the next day.

        Exposure to blue light before sleep time

        We’re exposed to harmful blue light on a daily basis through the use of our digital screens. If you’ve never heard of blue light, it’s part of the visible light spectrum that suppresses melatonin, our sleep hormones. Other harmful effects include digital eye strains and macular cellular damage.

        While daytime exposure to blue light is not very harmful, night time exposure tricks our brain into thinking it’s daytime. By keeping your brain alert and suppressing melatonin, your mind is unable to shut down and relax before bedtime.

        Eating close to bedtime

        Eating too late can actually be an issue for many people, especially those who are older than 40. The reason is, eating before laying down increases the chances of Gastroesophageal reflux disease (GERD), in which stomach acid backflows into the esophagus.

        Another reason not to eat too late is sleep quality. Even if you manage to sleep right after eating, it’s likely that you’ll wake up tired. Instead of letting your body rest during sleep, it has to digest the food that was entered before bedtime.

        Rule of thumb: eat 3-4 hours before bedtime.

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        Medical conditions

        In some cases, it could be medical conditions that cause your sleep problems. If you can’t relate yourself to the above reasons or any of these common sleep problem causes, you should visit the doctor.

        The vicious sleep cycle

        The biggest danger to repeating the bad habits mentioned above is the negative cycle that it can take you through. A bad night’s sleep can affect not only your energy but your willpower and decision making skills.

        Here’s an example of a bad sleep pattern:

        You get a bad night’s sleep
        –> You feel tired and stressful throughout the day.
        –> You compensate it with unhealthy habits (for example junk food, skipping exercises, watching Netflix etc.)
        –> You can’t sleep well (again) the next night.

          You can imagine what could happen if this cycle repeats over a longer period of time.

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          How to sleep better (throughout the night)

          To help you break the vicious cycle and stop waking up in the middle of the night, I’ll explain to you a list of actionable steps to solve your trouble staying asleep.

          1. Take control over the last 90 minutes of your night

          What you do (or don’t do) before bedtime have significant impact on the quality of your sleep. Many times, it can be the difference between staying up until 4am and sleeping like a baby.

          Here are a few suggestions:

          • Go from light to dark – Darkness stimulates production of the sleep hormone melatonin. Turn off unused light around the house, and think about investing into warm light that you can use in the bedroom before bedtime.
          • Avoid screens (or wear blue light blocking glasses) – Keep the bedroom a technology-free zone as the light from electronic devices can disturb your sleep. If you need to work, wear blue light blocking glasses (also known as computer glasses) throughout or before you sleep to prevent sleep disruption.
          • Find an activity that helps you to wind down  This could be anything that calms you down, and reduces thinking (especially unnecessary stress). Fir example, listening to soothing/good feel music, taking a hot bath, reading or meditating.
          • Keep any electronics you have on the other side of the room or outside the room – One of the most harmful things that can disrupt your sleep is the notifications you get from your smartphones. The simplest way to avoid this is to keep it away from you.
          • Create a bedtime routine – A night routine is a couple of things you do prior to going to bed. By doing these things every night, you’ll have a more restful and high-quality sleep. Learn how to pick up a night routine here: The Ultimate Night Routine Guide to Sleep Better and Wake Up Productive

          2. Eat the right nutrients (and avoid the wrong ones)

          What you eat (not just when we eat) plays a critical role in your sleep quality. If you’re ever in doubt of what to eat to improve your sleep, take the following into consideration:

          • Kiwi – This green fruit may be the ultimate pre-bed snack. When volunteers ate two kiwis an hour before hitting the hay, they slept almost a full extra hour. Kiwis are full of vitamins C and E, serotonin and folate—all of which may help you snooze.
          • Soy foods – Foods made with soy such as tofu, miso and edamame, are rich in isoflavones. These compounds increase the production of serotonin, a brain chemical that influences the body’s sleep-wake cycle.
          • Fiber-rich foods – Eating more fiber could be key for better sleep. Eating fiber was associated with more restorative slow-wave sleep—the more you eat, the better you sleep—per a study published in the Journal of Clinical Sleep Medicine. Fiber prevents blood sugar surges that may lower melatonin. Get a fiber boost from beans, artichokes, bran cereal and quinoa.
          • Salmon – Most fish, especially salmon, halibut and tuna boost vitamin B6, which is needed to make melatonin— a sleep-inducing hormone triggered by darkness.

          3. Adjust your sleep temperature

          Once you’ve gone through the first 2 recommendations, the last step to experiment with is temperature. According to Sleep.org, the ideal temperature for sleep is 60-67 Farenheit. This may be cooler than what most people are used to, but keep in mind that our body temperature changes once we fall asleep.

          Rule of thumb: sleeping in cooler temperature is better for sleep quality than warmer temperature.

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          Find out how to maintain the optimal temperature to sleep better here: How to Sleep Faster with the Best Temperature

          Sleep better form now on

          Congrats on making it to the end of this guide on sleep. If you’re serious about taking the necessary steps in improving your sleep, remember to take it one step at a time.

          I recommend trying just one of the steps mentioned such as taking a hot bath, blocking out blue light at night, or sleeping in cooler temperature. From there, see how it impacts your sleep quality and you can keep doing what works, and throw away what doesn’t.

          As long as you follow these steps cautiously and diligently, I know you’ll see improved results in your sleep!

          Featured photo credit: pixabay via pixabay.com

          Reference

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