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What is a digital multimeter and how is it used? Have you ever asked yourself this question, but you weren't sure exactly where to get the answer? If so, this article will provide you with some answers in a brief overview of what these instruments do, and how they are used in practical applications.

A multimeter is simply an electronic device that measures amps, volts, and ohms. This versatile tool combines the functions of three individual meters into one integrated instrument. The three individual meters contained in the multimeter are the ammeter, which measures current, a voltmeter, which measures voltage (potential difference between two points), and an ohmmeter, which measures resistance.

Multimeters are often used as hand-held tools for doing basic troubleshooting and field service measurements. They can also be used in a shop or manufacturing facility as a bench test instrument for measuring electrical output with a high level of accuracy. Additionally, multimeters can be used to service electrical problems in many different home and industrial applications such as batteries, motor controls, large and small appliances, electric power supplies, and all manner of wiring systems.

Multimeters come in two basic forms: digital and analog. An analog device has a needle; the digital counterpart has a LED or LCD display. Of the two, analog is the oldest technology. Although digital units have largely supplanted the analog devices in daily use, there are still many analog devices that are still used today throughout the world.

As with digital versions of other types of equipment, a digital multimeter provides a more accurate readout of what is being measured.

Digital multimeters, also known as DMM's are sophisticated instruments that are used to troubleshoot electrical problems in many fields requiring electrical service and maintenance. These devices are widely used by electricians, electrical engineers and service technicians in a wide range of industries including the automotive, manufacturing, computer, construction, and machine repair fields to name a few.

Inexpensive DMM's can perform the basic tasks of measuring of amps, volts, and ohms quite easily, but there are not too many bells and whistles with these devices. Even so, these cheap instruments probably have more features than the average person will ever need or use.

More expensive units on the other hand have many specialized features that can handle the most intricate and complicated electrical measurements needed for any job in any industry.

Digital multimeters are available at traditional brick and mortar retail stores that sell electrical test equipment, and online merchants. Features and prices vary greatly with each model. The least expensive multimeters can be purchased for about $10, while the more expensive premium digital multimeters can cost several hundred or even several thousand dollars. The price you pay all depends on what features you need, and how much you are willing to spend.

For information about the excellent Fluke 87v Digital Multimeters and other great Fluke digital testing products, Jesse recommends you visit Fluke Digital Multimeter website.

How To Repair Dell E151Fpb LCD Monitor - No Display Problem

Dell E151fpb LCD monitor came in with the complaint of no power but upon carefully look at the LCD you could see a very light (blur) white flashes across the screen and the power LED is not lit. Removing the cover was a bit easy compared to other models. As usual whenever the mainboard and power board were exposed, I would look for any bulged capacitor, darkened area, a loosen connector and etc. However this monitor boards looks perfectly okay. The next step was to separate the power/inverter board with the main board. Power was applied to the power board and I could hear a soft ‘chip-chip’ sound. When I measure the 12 volts line with a digital multimeter, the readout was about 7- 8 volts which was very unusual. In fact this is good news to us because we know what the next step that we should make.

Now we could use a 12 volt automobile brake light bulb to test at which section that is causing the low voltage output problem. If the LCD monitor designed to run on 18 or 24 volts then you could use a light bulb from the big trailer. A defective component in either primary or secondary side could cause low output voltage. Removing the fuse as shown in the photo and connect the bulb between the supply line and the cold ground could tell which section is giving problem. You could use this method but first you must confirm that the secondary filter capacitors, TL431 adjustable precision shunt regulator ic, optoisolators and components surrounding the optoisolator is working before you proceed to use the light bulb.

When the power is on the light bulb still do not lit and the sound still could be heard. This indicates that the primary side is having problem and we can leave the inverter/high voltage area and fully concentrate to locate the faults in the primary section.

This is the time to really test your basic electronics skill because you now know at which area the fault is and you just have to use your skills to locate the exact bad component. There were not much components in the primary side, and you could easily check all of them in less than 20 minutes. After checking all the components I was surprised that all of them tested okay. Primary winding of switch mode power transformer rings 8 bars which indicates good and even the uc3842b PWM power IC replaced the power still won’t work! It was quite challenging to troubleshoot this kind of problem where you are hundred percent sure that the primary side is giving problem yet you could not find out the culprit.

Since I had checked all the components and could not locate the fault, the only way that I could do is to direct replace the semiconductor devices such as the diodes, scr, fet, and transistors. From experienced I do encountered semiconductor components breakdown when under full operating voltage. One by one of the semiconductor components I replaced and power on each time I had changed it to see if the bulb light up or not. Guess what, you would not believe what have I just discovered-a defective 2N7000 fet! The moments I have replaced this fet and power on, the bulb immediately light up. I could not believe it was this faulty fet that causes all the output voltages to drop! I was so happy that I eventually solved the problem and who knows this could be a common fault for all DELL E151Fpb LCD monitor- so please take note to all LCD monitor repairer.

I began to check again the defective 2N7000 fet with my analog meter and peak electronic atlas component analyzer and the result is still the same-tested good! Just like flyback transformer, the best testing equipment to test Fet and other components is actually the equipment itself because it runs on full operating voltage, frequency, signal and etc. What you have just learned from here was that if all the suspected components tested good, the only way to reveal the truth is to direct replace the parts. Hope you enjoy this article and more good articles to come everyday! Wishing you all the best and happy repairing!

About the Author

Check out the two links below. You will be pleasantly surprised to find out that LCD and Electronic Repairs are so Easy and Highly Profitable for even a novice. You can learn the repairing secrets easily.

Find out How to Repair Any LCD Monitor - It is a breeze!

Learn the Secrets of Testing Electronic Components.

How do I wire a switch to a voltmeter to read six separate circuits?

I have 5-6 power sources, a combination of generators, batteries and solar panels.

I purchased a voltmeter on ebay that will allow me to check the voltage on each of the power sources:
http://cgi.ebay.com/Mini-Red-LED-DC-100V-Digital-Voltage-Volt-Panel-Meter-/250640302988?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3a5b53838c

Facts:
I know I can hook this up to each of the circuits and get a reading.
I do not want to rewire every time I need to get a status of each of these circuits.
I do not want to have six readouts.

I want to be able to flip a (perhaps a rotary switch) to see the condition/voltage of each of the 5-6 circuits. Does that mean I need I need a six pole switch? If you know of a specific product that will do this please include a detailed product description.

If your 6 sources do not have a common negative, you had better take Goober's advice and use a 2- pole, 6- position rotary switch.
If the negative of each supply is common, you can use a single pole switch, and you only need run the negative meter connection to the common negative, and wire each positive to a separate switch lug. Then connect the meter positive to the common (wiper) terminal of the switch.
Beware, the switch type for either method must have "non- shorting" type contacts!

Breaking down choices for electric vehicles
A car powered by electricity has been a dream of automakers for more than 100 years. Now, government decree and the popularity of gas-electric hybrids have reignited interest in them. Several models will reach showrooms by summer, and consumers already are interested.So what do you need to know about these cars? Despite differences in size and styling, some things are constant with all of them.

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