Maintain your old Siemens Hipath system

What Is A Fuse? And How To Test It.

A fuse is a very thin wire, which either melts or vaporizes when too much current flows through it. The thin wire may be made of aluminum, tin-coated copper or nickel. The resulting open in the circuit stops current flow. In electronic equipment, most fuses are cylindrical glass or ceramic type with a metal cap at each end! The current rating also can be seen in one of the two metal end caps. There are two popular physical sizes: 1 ? ¼ X ¼ - inch and 5X20mm. The 1 ? ¼ X ¼ - inch size is used in many automobiles. You'll find both sizes in many electronic equipment, but the smaller 5 X 20mm has become more common. Fuses are available with current ratings from 1/500 Ampere to hundreds of amperes.

Purpose of Fuses

The purpose of a fuse is to open an electronic circuit when current flow exceeds a certain amount, determined by the rating of the fuse. Opening a circuit under high current conditions can save electronic components from damaged and prevents overheating, which could cause a fire.

Types of Fuses

There is two basic types of fuses: fast acting and slow blow. The fast acting type will open very quickly when their particular current rating is exceeded. This is important for analog meter movements, which can quickly be destroyed when too much current flows through them, for even a very small amount of time. Slow blow fuse have a coiled construction inside. They are designed to open only on a continued overload, such as a short circuit. The purpose of coiled construction is to prevent the fuse from blowing on just a temporary current surge.

Do not use a slow blow fuse in place of a fast acting fuse. It may not open fast enough to prevent components damage under a high current condition. It's not harmful to replace a slow blow fuse with a fast-acting fuse, but it will probably open up unnecessarily every now and then when the equipment is first switch on. A blown fuse can tell you something about your service problem. Often the glass case of the fuse appears clear, and you can still see the broken pieces of the fuse element. This means you have the kind of problem that causes a slow, gradual overload on the power supply. Some fuses even die of old age. But if the inside of the glass fuse is discolored, and there is no trace of the fuse element (the center connector), you know that the center connector was destroyed quickly and violently, using a lot of heat. The fault was a short circuit or other problem that caused a lot of current to flow very quickly.

Is some cases a fuse will open up fast enough when there is a surge so that other components aren't damaged. If this is the case, replacing the fuse with one of the same type and rating restores operation. Unfortunately, a high probability exists that if a fuse blew, something in the circuit it was protecting shorted out. In this case, a replacement fuse blows right away. The blown fuse can easily be replaced by a new one, after the overload has been eliminated when come into replacement. Use only the same current and voltage ratings as the original. The common type and current rating of a fuse in a monitor are slow blow 2A to 5A. When you buy replacement fuses, get several ? you can easily use all of them while you're troubleshooting an elusive problem.

Testing Fuses

Turn the power off and remove the fuse from the circuit to check with a multimeter set to the lowest ohms range. Connect the probes to both end of the fuse. You may check the fuse while it still in circuit. A good fuse should showed continuity or read 0 ohm. A blown fuse is open which reads infinity on the meter.

Jestine Yong is a electronic repairer and writer. For more information about electronic repair please visit his website at http://www.noahtec.com

In The News:

Trump backs Putin over US intelligence agencies
Mon, 16 Jul 2018 19:04:00 +0100
Donald Trump has again denied collusion between his election campaign and the Kremlin, saying he trusts Vladimir Putin's denials over American intelligence services.

Journalist dragged out of Trump-Putin summit
Mon, 16 Jul 2018 16:17:00 +0100
A journalist was dragged out of the Trump-Putin news conference moments before the leaders were due to speak, after holding up a piece of paper bearing the words "nuclear weapon ban treaty".

Fans pack Paris to get glimpse of World Cup winners
Mon, 16 Jul 2018 18:28:00 +0100
Hundreds of thousands of people packed the Champs Elysees in Paris as France's victorious football team paraded the World Cup.

Russian charged with infiltrating US political groups
Mon, 16 Jul 2018 20:24:00 +0100
A Russian woman has been charged with infiltrating US political organisations at the direction of a senior Kremlin official.

Croatia get hero's welcome after World Cup
Mon, 16 Jul 2018 15:50:00 +0100
Tens of thousands of people poured into the streets of Croatia's capital Zagreb to stage a hero's welcome for their national football team.



tikatoshop.it

Erfahrungen mit Pallhuber Wein
Agen Bola SBOBET Terpercaya

Travel in comfort and at your leisure with CT Airlink Limousine & Car Service for top quality private transportation and exceptional customer service. We operate Sedans, SUVs & Vans for CT Car Services to covering all Connecticut airports including Car Service from CT to Newark Airport , Mohegan Casino Uncasville CT, Foxwoods Casino Mashantucket CT, Manhattan Cruise Terminal NYC, Brooklyn Cruise Terminal NYC and Bayonne Cruise Terminal NJ. CT Airlink hire licensed and friendly chauffeurs who have in-depth knowledge of the Areas.

Alternatives to Tape Backup

You may ask, isn't tape an anachronism in the age... Read More

Do You Feel Used by Computers?

Do You Feel Used by Computers?A look at second-user computer... Read More

Where Can I Find The Best Case Mods Online and Save Money?

Are you captivated by the stunning Case Mods you've seen... Read More

Buying a New Computer

Someone recently asked me "I teach senior citizens in a... Read More

Protecting Your Computer From Power Surges, Data Loss, Viruses, And Spyware

Protecting Against A Power Surge:Your computer is an expensive investment;... Read More

Lock Workstation Fast

When you work in an office, it's important to lock... Read More

How To Refill Your Ink Cartridge

Forget about emptying your wallets every time you see the... Read More

ATA vs SATA

Hard Drives: ATA versus SATAThe performance of computer systems has... Read More

Getting A Great Refurbished Laptop

Are you sick of all the high priced notebooks out... Read More

Special Events Recording in DVD Players Age

The proliferation of portable DVD players has dramatically changed the... Read More

Inkjet Jargon Explained

With all the technical terms out there, it is becoming... Read More

Computer Components for Idiots

There are many fancy add-ons for computers, but the basic... Read More

How to Add or Remove an IDE ROM drive

CD ROMS - If you're adding or removing an internal... Read More

Discover Everything About Wholesale Bar Code Reader And Software!

It is a given fact that buying wholesale would make... Read More

A Review of Refurbished Toshiba Laptops

Toshiba offers a few of their refurbished laptops in the... Read More

Ink Cartridge Recycling 101

Let's take a moment to think about the topic of... Read More

ESR Meter - The Capabilities To Check Beyond Electrolytic Capacitor

There is something good about esr meter because besides electrolytic... Read More

Building A PC

Many people simply go to the retail store and get... Read More

ABCs Of DVD Drive Abbreviations

The number of different formats available in DVD drives can... Read More

Cisco CCNA Certification: An Illustrated Guide To Ethernet CSMA/CD

When you're studying for your CCNA exams, you're going to... Read More

Setting up a Tape Backup Strategy for your Business

So you know a little bit about tape backup, but... Read More

Throw Away The Fax Machine ? A Guide To Online Fax

Have you ever felt like throwing the fax machine out... Read More

A Review of HP Laser Toners

Hewlett-Packard is, along with Brother and Samsung, one of the... Read More

Motherboard Basics

A recent Tech Tip covered the basics of selecting a... Read More

How to Read CRT Tube Part Numbers

All picture tubes, whether monochrome or color type are identified... Read More