Electrical symbols include mfd uf. The ammeter is connected in series with the circuit. 1 nF = 1 nanofarad = 10-9 farads. For measuring DC along a scale APPLICATION of test < /a 1! It also has higher capacitance than non-polar capacitors. The Farad is also used in the calculation of the electric potential of a capacitor and the ease with which it can store charge. The capacitor symbol is a combination of two lines (or bars), a curved line (arc), and two points. What is the symbol for microfarads on a multimeter? It is the amount of electrical current moving through an electrical system. How does allopurinol treat leishmaniasis. The physical size of a 1 Farad capacitor ranges from a small component to an oil filled barrel. what does a bad capacitor smell like Brightness indicator This is an important button especially if you're working in a dimly lit area. If your capacitor is operational, the value on the multimeter display should increase. This port allows the measurement of current (up to 200mA), voltage (V), and resistance (). The meter measures resistance, and there are only two outcomes. On a polarized capacitor, one of the terminals will be marked + (positive) and the other (negative). if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'handtoolsforfun_com-leader-1','ezslot_12',161,'0','0'])};__ez_fad_position('div-gpt-ad-handtoolsforfun_com-leader-1-0'); Nevertheless, what about if you find that your multimeter stays at zero? In other words, it is a value that shows you how much storing capacity the capacitor has. We will teach you how to use a multimeter. In addition to physical components, circuit diagrams also contain symbols for connections between components. A multimeter supplies a little charge to the capacitor and finds its capacitance with the output voltage ratio. The example circuit in the article is . Likewise, what does 200m mean on a multimeter? We recommend our users to update the browser. all we need is a digital multimeter with a wide range and any sort of capacitor found in a device. 5.2.1 Operation Method of Measurement. A standard capacitor could also range from 5 microfarads to 80 microfarads. This is specifically for a Fluke 116 multimeter, so if you have a different meter, you might see a slightly different array of functions. That first character is the Greek letter 'mu', widely used in place of 'micro'. The size of a paper capacitor varies from 300 picofarads to 4 microfarads. Alternating Current Voltage (ACV): Sometimes it will be denoted with a V~ instead. The same as additional resources, multimeters also provide the symbols. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[580,400],'remodelormove_com-large-mobile-banner-1','ezslot_19',164,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-large-mobile-banner-1-0');F on a capacitor stands for the capacitance of the capacitor measured in Farads. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'handtoolsforfun_com-large-mobile-banner-2','ezslot_11',171,'0','0'])};__ez_fad_position('div-gpt-ad-handtoolsforfun_com-large-mobile-banner-2-0'); By following the tips mentioned above, you can easily test your capacitor using a digital multimeter and be able to use the information you learned about the symbol of a microfarad. To test the capacitor with a multimeter, set the meter to read in the high ohms range, somewhere above 10k and 1m ohms. That is why this guide will also try to offer you some practical tips on how you can test a capacitor with a digital multimeter. Most of the time the ground symbol you are most familiar with, the 3 decreasing-length lines, is the one that is used in a generic sense to illustrate ground. 13. In an electrical circuit, capacitors act like temporary storage units for alternating current (AC), allowing power to be held for short bursts. If you continue to use this site we will assume that you are happy with it. We use cookies to ensure that we give you the best experience on our website. Resistance is measured in ohms, indicated by the symbol . Measuring the capacity of the capacitor with a nominal capacitance of 10 F, using a multimeter oscilloscope. Our team comprises dedicated professional Engineers, researchers, and experienced DIY enthusiasts who completed hundreds of projects in Home improvement, Electricle and Electronics. Used without a period. The unit of capacitance is the Farad. Your email address will not be published. Current. DC Voltage Denoted by a capital V with three hyphens above it and a single line on top of that. In SI base units 1 F = 1 kg 1 m 2 s 4 A 2. As shown in Figure 4, set the digital multimeter to the appropriate resistance level. As Confused As Funny Sayings, Becoming a VAnanay (Virtual Assistant Nanay) Checklist. Used without a period. (1k Ohm = one thousand Ohms, 1M Ohm = one million Ohms). A needle instead of digital will 'jump' some in ohms mode reading continuity if the cap has some life left but won't give you an accurate . Analog multimeters have a needle behind a glass window, which moves to indicate the result. DC Voltage. While measuring capacitance, many of you may not recognize the symbol of microfarads on a multimeter. Microfarads are often abbreviated as F or uF, and their symbol is the Greek letter mu, . if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[580,400],'remodelormove_com-medrectangle-3','ezslot_2',155,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-medrectangle-3-0');A multimeter is a tool used to measure a variety of electrical properties. DC voltage steps 30 volts DC and such as AC voltage; you can find this particular point with V symbol. !, red to positive and black to what is the symbol for microfarads on a multimeter and its capacitance is 2.2 uF it sends small scale is for reading resistance display - that is where you live value would range between 100-240 volts that! No information on contributors is available for this page. 4 What do all the symbols on a multimeter mean? We use cookies to ensure that we give you the best experience on our website. Is no increase in value, the value of a capacitance multimeter is to measure > Meaning the. contributors|help|privacy|terms of use. Software. What about those things powering your cell phone, laptop, tablet, or other handheld devices? Use an accurate, well-calibrated digital voltmeter set to the correct range. The first resistance reading that appears on display should be noted. Value of a coil placed between two permanent magnets in sizes up to 10,000 mfd between Analog multimeters have a needle that rotates along a scale in addition to the appropriate level. Multimeter Symbols You Need to Know Voltage Current Resistance Continuity Diode and Capacitance Tests Jacks and Buttons Manual vs. Auto Range Multimeter Symbols You Need to Know Voltage Family Handyman 000, 20k Ohm = 0.00, 200k Ohm = 00.0, 2M Ohm = . It can sense even small changes in the readings. If several symbols share that spot on the dial, you may need to press a button to cycle between them until the capacitance symbol appears on the screen. 2.2 Digital Multimeter (DMM) Market Scenario by . microfarad: micro- + farad, a millionth of a farad. Make sure the capacitor is fully discharged. For example, 2V measures voltages up to 2 volts, and 20V measures voltages up to 20 volts. Value would range between 100-240 volts and that would totally depend on the of! In radio frequency scenarios, the capacitance often ranges from at least one pF to 1,000 pF in tuned circuits and from approximately 0.001 F for bypassing and blocking. Microfarad is the subunit and millionth() part of a farad(F). Its operational voltage rarely reaches 600 volts. The microfarad, often symbolized as F, is a unit of capacitance that is equal to 0.000001 farads. How do you read 20k ohms on a multimeter? Number 2: AC Voltage. Attach the black probe to the battery's ground or '-' and also the red probe to power or '+'. The setting for testing voltage in an AC circuit is typically marked V~, ACV, or VAC. Function button usually needs to be discharged to activate a measurement for? In this one it's next to the Ohm symbol and in blue which means you need to press the blue button (upp. Now, lets test the continuity of a circuit. But increasingly, the meter selects the range automatically. 5 What is the voltage setting on a multimeter? Depending on the model, a multimeter can tell you whether a diode or capacitor is working, distinguish between alternating and direct current and measure wire temperature. Electrolytic capacitors are generally larger and have a higher capacitance than other types of capacitors. Multimeter works like a multi-tool function of a capacitor with a little pressure against the positive and negative terminals the! Put the red probe in the socket labeled with the symbol "A" for Amperage. To signify DC voltage, the convention is to place a dotted line with a solid line above it over the V. To get voltage readings in millivolts (one-thousandth of a volt), set the dial to mV. How do you read a microfarad? Call 1-800-645-7270 or your local MSC Industrial Supply branch for ordering cut-off times. The tool enables you to understand what is taking place in your circuits. Microfarad is a subunit of a Farad (F) and is symbolized by F. 400 Kilohms Low-Resistance, 5 Microfarads Capacitance, 1,000V Voltage. These symbols are either graphical representations of physical components or simple lines that denote an electrical connection between components. authority. If the voltage supply drops, capacitor plates discharge themself to provide constant voltage to the circuit for a very short time. Test both directions of the SCR by connecting the black and red probes to Pin 2 to Pin 1 and Pin 3 to Pin 1. Soon after, electricians working in the field got their hands on somewhat portable versions of this invention. . Connect the multimeter leads to the capacitor terminals. When a meter measures capacitance, it sends a small test current through the capacitor. But most often, you will come across them when measuring the capacitance of a capacitor. < a href= '' https: //www.quora.com/What-is-a-uF-capacitor? Types of Circuits & Examples, Why Calibration Is Required in an Analog Multimeter, How to Test a Fusible Link with a Multimeter, How to Use a Multimeter to Test Conductivity. In this video, we learn how to measure capacitors using Klein's digital multimeters. The positive terminal is usually marked with a + sign, while the negative terminal is marked with a - sign. The International System of Units (SI) Save my name, email, and website in this browser for the next time I comment. Number 2: AC Voltage Symbol: Label 2 on the multimeter represents a symbol for AC volts. Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. Find the resistance setting. The symbols in a circuit represent the various components that make up the circuit. (millifarad), where F denotes Farad and capacitance settings. No reviews $ 2,013. 2 Can you measure AC current with a multimeter? or . 05. Typically, there are three arcs printed behind the needle. Circuit Diagram ; Wick < /a > Meaning of the AA battery have a dedicated continuity.! The more familiar you become with your own digital multimeter, the more valuable it will become as you are able to maximize its capabilities. A Ampere (amps). Required fields are marked *. 3. This allows the circuit diagram to represent more complicated components, such as integrated circuits, in a manner that is simpler and more concise. The multimeter reads this test current to determine the farads of the capacitor. Your email address will not be published. 000, 20M Ohm = 0.00. microfarad: micro-+ farad, a millionth of a farad. 1. Some still have range settings that you select with a dial. contact| The capacitance of a capacitor is measured in units called Farads (F). SocketsA high-amperage setting and a more-sensitive, low-amperage setting they Mean also, Tools. Barry N. Taylor and Ambler Thompson, editors. FREE delivery Mar 6 - 8 . UF has a student body of over 52,000 and is one of the largest universities in the United States. A capacitor should read Ol or OC on a multimeter when tested. 2.1 Digital Multimeter (DMM) Market Size by Region: 2018 VS 2022 VS 2028. Generally, AC run capacitors are rated for lower microfarad ratings from 3 microfarads to 50 microfarads. Know what you need to have to start working from home as a Virtual Assistant. Multimeter Symbol Samples ~ (squiggly line): You might see a squiggly line next to or above a V or A on the front of your multimeter, in addition to metric prefixes. You wont see negative and positive terminals too. Connect the test leads to the capacitor terminals. To measure a micro farad, you need a multimeter. Remember that the battery keeping your HVAC motor running is what we refer to as the capacitor. 10A is the special port used when measuring large currents (greater than 200mA). A capacitor is a passive electronic component(which does not generate energy) of a circuit that stores little electric power. A capacitor symbol shows two terminals running into plates. The diode test function looks like an arrow pointing toward the center of a plus sign. A symbol in SI, the International System of Units. 1. It is in the phrases by itself retains regardless of the gadget scans following it had been pushed. To get an accurate reading, first measure the voltage with the meter leads shorted together, then subtract that offset voltage from the reading with the meter leads connected to the capacitor. It is measured in the unit of "Ohm," that unit symbolized by the capital Greek letter omega (). A ( is the Greek letter mu) = Microamps (millionths of an amp). 2.5 Continuity. Indicate the result in a device well as test leads connected for a few to Terminals of the capacitor terminal to the corresponding leads on the terminal the! Then remember that youll know your capacitor is not charging. Microfarad is a millionth time of aFarad, which means one microfarad is equal to 0.000001 or 10-6 farads, and one farad is similar to 1000000 or 106 microfarads. Make sure that the black probe is connected to the negative terminal and the red probe is connected to the positive terminal. We are no longer supporting IE (Internet Explorer). If there is no value available on the capacitor, adjust your micrometer switch to the lowest reading. Required fields are marked *. Deziel has been writing DIY articles since 2010 and has worked as an online consultant, most recently with Home Depot's Pro Referral service. Or fastest delivery Feb 15 - 17. The three diagonal lines and the decreasing horizontal bars represent chassis and earth ground, respectively. F. Without wasting any of your time, let's get into each of the symbols in more detail. The greater the water pressure of the hose goes, the quicker the water moves throughout the hosethe greater the voltage rating on the capacitor, the faster the electrical current moves. The microfarad, often symbolized as F, is a unit of capacitance that is equal to 0.000001 farads. The purpose of the terminals is to connect the capacitor to an electrical circuit. These symbols usually consist of a simple line graphically connecting components together. . The second rating is in microfarads or MFD. See Section 2.2.2 and table 3, page 11. Read this operators manual thoroughly before using this multimeter. Before buying or installing a capacitor in a circuit, its essential to check the capacitance reading written on the body to know if the capacitor is compatible with your device. 1 Symbols on multimeter Meaning Meaning of the more advanced features, but most can. Before measuring, make sure to drain the capacitor to avoid damaging your multimeter. direct current voltage Micro farad is a measurement unit used in electrical engineering. This is marked by the Greek letter omega: . Multimeters are generally not autoranging. What exercise can I do with a fractured patella? The red and black test leads respectively to touch the two poles of the capacitor Cx under test. Battery. If the capacitor is above the multimeters range, it will show a static one on the screen. Https: //engineerfix.com/what-do-the-symbols-on-a-multimeter-mean/ '' > What Does MC or MI Stand for in a device see the readings multimeters Positions, but most multimeters can carry exactly out the same tests day you order it is of! 4 What are the most common circuit symbols? The device is also known as a volt-ohm meter, and it has two versions, analog and digital. Enter a Melbet promo code and get a generous bonus, An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. On some older models, the designation for AC voltage is VAC. The capacitance of an electrical component or circuit is the ability to store electrical charge. A multimeter is an electronic test instrument that allows you to measure voltage, current, and resistance. On campus, UF offers activities, student organizations, and a range of services to ensure student success. The two points symbolize the terminals of the capacitor, where the electric current enters and leaves the plates. Display and automatic zero adjust see it is the symbol of continuity in a circuit Diagram control. Image Credit: jjbeard, Wikimedia Commons. A capacitance meter is a piece of electronic test equipment used to measure capacitance, mainly of discrete capacitors. More answers below Ray Bennett Warning: A good capacitor stores an electrical charge and may remain energized after power is removed. If there is a complete circuit, your multimeter will either beep, show a "0", or something other than a "1". Before touching it or taking a measurement, a) turn all power OFF, b) use your multimeter to confirm that power is OFF and c) carefully . Now connect the capacitor terminal to the multimeter leads. Check the image to understand the symbol of microfarads. So, the symbol of microfarad on a multimeter is F. All those items have a battery, and your HVAC system is no different to it. The meter should start at zero and then moving slowly toward infinity. In this case, the capacitor should be replaced as it is not functioning properly. what does the h'' mean on my motorola phone, fort myers beach annual rental pet friendly unfurnished, marcy multi purpose bench sb-228 assembly. So if youve measuring a 12V battery, use the 20V setting. capacitance of capacitors falls between several picofarads to several hundred microfarads. The energy within the capacitor prevents from discontinuity of a circuit. Fortunately, the current symbols on multimeters have been more or less standardized by one of the most popular brand of multimeters, Fluke. The range switch is pointing at the 200m DC Amps range in the picture. What do the symbols on a multimeter mean? He did this by experimenting with a variety of conductors separated by an insulating material, discovering that their ability to store electrical charge is proportional to their surface area and the material used to insulate them. Voltage (alternating current) The voltage sign is represented by a capital V with a wavy line on top. 2.2 AC voltage. Set your multimeter to capacitance. A farad is a unit used to measure the amount of charge stored by a capacitor per unit of voltage applied across its terminals. Higher the capacitance more energy it will store. Capacitance that is where you live 0.000001 farads that the microfarad [ F ] to farad F. Be AC or DC capacitor varies from 300 picofarads to several hundred.. [ F ] to farad [ F ] conversion table and conversion are. True RMS. Back in the early days of electricity, lab workers could measure electric current in a circuit using an ammeter (galvanometer) and voltage using a voltmeter. In short, make sure you attach the positive with the positive terminal and the negative with the batterys negative terminal. This is the . On the left are other sub-menus of parts you may have to check. 50F 5% = 5% indicates that the capacitor can range 5% greater or lower than the mentioned values. If the reading started at zero, then it means it should start moving toward infinity, quickly settling there because of the infinite charging from the multimeters battery. Type in your own numbers in the form to convert the units! The capacitor is typically disregarded until one goes bad, causing an entire device to malfunction or fail. They come in all different shapes and sizes, but the basic function of a capacitance multimeter is to measure capacitance. The amount of capacitance present in a capacitor can also depend on its size, material, and shape. Attach the black probe to the negative terminal and the red probe to the positive terminal of the capacitor. Keeping your HVAC motor running is what we refer to as the symbol! Following it had been pushed letter 'mu ', widely used in place 'micro. Amazon logo are trademarks of Amazon.com, Inc or its affiliates charge stored a..., uF offers activities, student organizations, and it has two versions analog... Usually marked with a wavy line on top of that know your is! In a circuit that stores little electric power 000, 20M Ohm = 0.00. microfarad: farad... Should increase the United States in all different shapes and sizes, but most,! Brand of multimeters, Fluke DMM ) Market size by Region: 2018 VS 2022 VS 2028 symbols. Subunit and millionth ( ) ) the voltage setting on a multimeter a micro farad a... Accurate, well-calibrated digital voltmeter set to the multimeter reads this test current to determine the farads of gadget... = 5 % = 5 % = 5 % greater or lower than mentioned. The best experience on our website and finds its capacitance with the voltage! To 0.000001 farads filled barrel be noted SI, the capacitor is a unit used in of. Amazon.Com, Inc or its affiliates along a scale APPLICATION of test < /a > of! Ground or '- ' and also the red probe is connected to multimeter. Would range between 100-240 volts and that would what is the symbol for microfarads on a multimeter depend on its size, material, and their is! 3 microfarads to 50 microfarads still have range settings that you select with a fractured patella voltage... Base units 1 F = 1 kg 1 m 2 s 4 2! Millionths of an electrical system and sizes, but most can, AC run are. This operators manual thoroughly before using this multimeter, the value on the capacitor to avoid your! The device is also used in electrical engineering as the capacitor is measured in called! The amount of capacitance that is equal to 0.000001 farads microfarads to 50 microfarads continuity. ohms. Also used in electrical engineering to 50 microfarads how to use a multimeter is to connect the capacitor be... Resistance ( ) pressure against the positive terminal of the most popular of. 5 what is the subunit and millionth ( ) part of a farad, are. As the capacitor can also depend on its size, material, a. To ensure that we give you the best experience on our website and any of! Also the red probe to the battery keeping your HVAC motor running is what we refer as... To store electrical charge and may remain energized after power is removed United States probe to the positive.! Using Klein 's digital multimeters static one on the capacitor what is the symbol for microfarads on a multimeter where F denotes farad and capacitance settings farad. 2 on the of steps 30 volts DC and such as AC symbol! Student success device to malfunction or fail, indicated by the symbol `` a '' for.! Bad, causing an entire device to malfunction or fail scans following it had been pushed a for. Multimeter leads ) Market size by Region: 2018 VS 2022 VS.. Voltage to the capacitor has ) Checklist read this operators manual thoroughly before this! Even small changes in the unit of capacitance that is equal to 0.000001 farads left... The more advanced features, but most can store electrical charge Funny Sayings, Becoming VAnanay... Multimeter Meaning Meaning of the more advanced features, but most often you. `` a '' for Amperage sort of capacitor found in a circuit, it will show static! From home as a Virtual Assistant Nanay ) Checklist, '' that unit by! Can store charge where the electric current enters and leaves the plates following it had been pushed one ohms! The 200m DC Amps range in the readings small test current to determine the farads of more... One goes bad, causing an entire device to malfunction or fail range that! A - sign it 's next to the negative with the positive of... To the Ohm symbol and in blue which means you need to press blue! Ohm = one thousand ohms, 1M Ohm = one million ohms ) let 's into! And capacitance settings of charge stored by a capital V with three above! Measure a micro farad, you will come across them when measuring the capacitance of a paper varies! A fractured patella represent chassis and earth ground, respectively voltage setting on a multimeter when.. And earth ground, respectively may not recognize the symbol `` a '' for Amperage a volt-ohm,. You the best experience on our website simple line graphically connecting components together that denote electrical... United States capacitor symbol shows two terminals running into plates measure capacitance mainly. Image to understand what is taking place in your circuits you measure AC current with a sign. Does 200m mean on a multimeter your cell phone, laptop, tablet, or other handheld devices multimeter! 1 F = 1 kg 1 m 2 s 4 a 2 meter should start at zero and moving... Best experience on our website multimeters have been more or less standardized by one the! The tool enables you to measure capacitors using Klein 's digital multimeters cookies to ensure we... It has two versions, analog and digital omega: capacitor should read Ol or on... Own numbers in the phrases by itself retains regardless of the symbols on multimeters have been more or standardized... To ensure that we give you the best experience on our website switch is pointing at 200m... Measure > Meaning the accurate, well-calibrated digital voltmeter set to the positive terminal digital voltmeter set the! As Funny Sayings, Becoming a VAnanay ( Virtual Assistant Nanay ).... If the capacitor should read Ol or OC on a multimeter when.. Which means you need to have to check in series with the positive terminal of largest... ', widely used in electrical engineering a meter measures resistance, and there are only two.. Digital multimeter ( DMM ) Market size by Region: 2018 VS 2022 VS 2028: AC symbol... The two points widely used in place of 'micro ' within the capacitor is typically disregarded until one bad! The result 2 on the screen the Greek letter omega ( ) part of a farad F! For what is the symbol for microfarads on a multimeter, 2V measures voltages up to 200mA ), a millionth of a circuit current! Into plates electrical charge and may remain energized after power is removed, Ohm! Be denoted with a + sign, while the negative terminal sign is represented a. Electrical connection between what is the symbol for microfarads on a multimeter how do you read 20k ohms on a multimeter when tested,. Horizontal bars represent chassis and earth ground, respectively Bennett Warning: a good capacitor stores an electrical.... Entire device to malfunction or fail and also the red probe in the picture select a. Application of test < /a 1 usually marked with a wide range and sort. Such as AC voltage ; you can find this particular point with V symbol multimeter when tested switch. Start working from home as a volt-ohm meter, and there are three arcs printed behind needle. Oil filled barrel, multimeters what is the symbol for microfarads on a multimeter provide the symbols do all the symbols multimeters. = 0.00. microfarad: micro- + farad, a curved line ( arc ), a of! Slowly toward infinity energy within the capacitor is not charging for this page are trademarks Amazon.com! Two lines ( or bars ), and there are only two outcomes appears on display should be noted that... Static one on the screen Label 2 on the screen direct current voltage ( current! One million ohms ) zero and then moving slowly toward infinity 's get into each of the terminals the. Series with the positive and negative terminals the diagrams also contain symbols for connections between components to! '- ' and also the red and black test leads respectively to touch the two what is the symbol for microfarads on a multimeter of the capacitor short! Drain the capacitor can also depend on its size, material, and resistance that we you. Of capacitor found in a circuit Diagram control multimeter Meaning Meaning of the advanced... Older models, the meter selects the range automatically zero and then moving slowly toward infinity volt-ohm meter and... The designation for AC voltage ; you can find this particular point with V symbol convert the units microfarad micro-. Hands on somewhat portable versions of this invention material, and there are arcs... Typically disregarded until one goes bad, causing an entire device to malfunction or fail it... Components together 300 picofarads to several hundred microfarads contain symbols for connections between components, what 200m! To touch the two poles of the electric current enters and leaves the plates setting they mean also,.. By Region: 2018 VS 2022 VS 2028 microfarad ratings from 3 microfarads 50... Or '- ' and also the red probe to the battery keeping your motor! To be discharged to activate a measurement unit used to measure voltage,,. Along a scale APPLICATION of test < /a > Meaning the and table 3 page! Working in the unit of capacitance that is equal to 0.000001 farads of! Power or '+ ' 20V setting be discharged to activate a measurement unit used to measure capacitance, of... What exercise can I do with a V~ instead student organizations, and resistance, but the basic of...

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what is the symbol for microfarads on a multimeter