Setting Up as a Electronic Repair Authorized Service CenterWritten by Jestine Yong
If you plan to upgrade your workshop into an Authorized Service Center, this should guarantee plenty of work and a secure future. Setting up from scratch as an Authorized Service Center is not an easy job. Your workshop need to meet manufacturers’ requirement first before they can appoint your company as an Authorized Service Center.
• Good track record – Manufacturer expect a company to have a good track record in trade and have been around for a long time. • Accessibility – Easy for a manufacturer to deliver products to you for repair besides it save time. • Space – A company must have enough space to store their product. A light industrial unit will be fine for them. • Security – An alarm system is essential, door and windows must be protected so they are difficult to force. Any break in will cause you to lose business.
What is ESR METER ? Written by Jestine Yong
All capacitors have a certain amount of resistance to passage of AC current. ESR (Equivalent Series Resistance) is sum of all internal resistances of a capacitor measured in Ohms. An ideal capacitor has ZERO ohms ESR. From diagram below you can see a resistor in series with a “PERFECT CAPACITOR”. The value of resistor is called ESR. Electrolytic Capacitors have a tendency to increase its ESR overtime due to drying or corrosion. High ESR is a frequent problem in today’s electronic circuit. Even a 1 or 2 ohms rise in ESR can cause complicated problems. Under normal conditions ESR has a very low value, which stays that way for many years unless rubber seal is defective, in which case electrolyte’s water component gradually dries out and ESR creeps up with time. The increase in ESR increases both voltage drops within capacitor and heat, produced in capacitors due to resistive heating. If you don’t check for ESR, you may be in for a “TOUGH DOG” repair. High ESR is first sign of a capacitor failure. High ESR will cause complete circuit failure, over heating of capacitor, loading of circuit, overstressing of other circuit components and other undesirable effects. Why should I use an ESR?
Because measuring an electrolytic capacitor with an analog or digital capacitance meter can MISLEAD a technician into believing that a defective capacitor is good. This can waste your precious time and you are unable to repair equipment. Which means you can’t charge your customer! If you don’t test for ESR on capacitor, you will always miss bad capacitor. Normally, these bad capacitors have high ESR reading which your normal multimeter or digital capacitance meter can’t measure. Only by using ESR meter, you will be able to measure ESR on capacitor and you will not be fooled by capacitors with bad ESR. ESR meter can even work IN-CIRCUIT, which means you don’t have to solder out capacitor in order to measure it using normal capacitor tester, which would not be accurate anyway. Do you know that ESR meters can perform other wonders besides checking ESR of a capacitor? Some digital ESR meter have features of checking: