26
Jan 12

Test Electronic Components

To be able to test electronic components accurately is essential to identifying faults for any electronic repairer. Top quality electronic testing equipment is therefore much sought after.

If you are involved in electronic repairs, professionally or just as a hobby, you will know just how much time good equipment saves you. Normally, however, this type of equipment to test electronic components can be relatively expensive, especially for do it yourself enthusiasts and people thinking about starting a small or part-time business.

What many people are unaware of is just how easy it is to make your own gear and multimeter to test electronic components to the standards of top of the range brands, but at a fraction of the cost. All you need is the necessary know-how.

There are some guides available to show beginners how to test electronic components and how to repair electronic devices and appliances. You should be looking for the following things when evaluating such a guide.

Good electronic test guides should include the following:

First, check the author’s credentials. Does he perform professional electronic repairs? Is he an electronics testing instructor? Do his instructions appear to be easy to follow and well laid out? Does he offer a guarantee if you are not fully satisfied with his manual? Does he identify being able to test electronic components with electronic repair? He should be aware that repairs are straightforward if you have the correct equipment to identify problems. And is his manual reasonably priced?

Secondly, make sure any guide not only explains how to make your own testing equipment but also explains which equipment to use for particular jobs, how you actually employ that equipment, what to test for and in what sequence. It’s all very well to have superior testing equipment to hand but if there is no methodology to follow in testing, you will just be wasting your time.

Without doubt, working out how to test electronic components can become quite complex. Much like wiring a house or office, without proper plans to work from, even the experts can become confused. If your systems of fault identification aren’t clear and easy to follow, frustration and disaster lie ahead. So, make sure any guide includes easily comprehensible diagrams and descriptions.

Ensure your guide does not just cover the basics. Part of the reason for making your own kit to test electronic components is to give yourself an advantage over other electronics testers. Most equipment that is declared unrepairable is, in fact, eminently repairable. Normally the tester simply has not been able to identify the problem; if he could identify the fault, it is not usually beyond repair.

Ensure any manual also covers testing for faults and shorts using an analogue meter and how to make such a meter. It will prove to be invaluable in cases where a digital meter has its inherent shortcomings.

So, to reiterate, superior testing equipment is essential, but no less important is having foolproof plans of testing to work through so the fault is not missed. The order of testing is important in the sense of saving time by testing for the most common faults first and so on. A good guide should also include a comprehensive troubleshooting section.

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20
Jan 12

UNI-T UT81B Multimeter Oscilloscope Digital by UNI-TREND

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17
Jan 12

How to use a Multimeter to analysis accepted things about the house

How to use a multimeter to test outlets, batteries and wiring

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04
Jan 12

How to Troubleshoot a Hot Tub Heater

I have been asked this question by so many customers. Why won’t my hot tub heat up? I have talked people through this process over the phone and have sent them a list of information on how to test the spa heater themselves. I do not normally recommend that an end user try to troubleshoot their own spa. Working with electricity can be dangerous and working with electricity and water can be deadly. It is always recommended to contact a qualified service technician for any troubleshooting. That said, many people are more than capable of troubleshooting their own spa heater and this guide will assist them.

Spa & Hot Tub Heater Troubleshooting Guide

An easy to follow Spa & Hot Tub heater Troubleshooting Guide. Troubleshooting a spa heater can be a simple procedure if you have the right tools.

Note: This troubleshooting guide is meant for trained spa service professionals. It is not recommended for the spa owner to troubleshoot their own spa.

Tools you will need to have are:

A Multimeter, to check voltage, and a Clamp on Amp Meter, to check for amp draw at the element. You can not accurately troubleshoot a Spa heater element without these tools.

Multi-Meter: Used to test for voltage at the heater element terminals.

Amp Meter: Used to check for amp draw by the heater element.

You will also need various hand tools. Screw drivers, Pliers, open end wrenches, etc.

Note: Spa must be full of water and in normal operating condition to perform these tests

To test the heater element, you must: Check voltage at heater element

1. Turn Power off to spa. (This means to shut off source voltage to the spa at the breaker or disconnect).

2. Open equipment area and locate the heater assembly.

3. Open the spa heater assembly to expose the heater terminals.

4. Make sure all other wires and connections are away from the heater terminals.

5. Open spa filter housing and remove filter. Replace filter lid and secure for operation.

6. Double check area around heater terminals to make sure you have access to the terminals with the multi-meter probes, without the hazard of touching other contacts.

7. Remember, when you re-apply power to spa, you will be working with 240 volts of electricity. Water and electricity do not mix.

8. Make sure no water is near the terminals where you will be working. Also, make sure you are not kneeling or standing in water while testing for voltage at the heater terminals.

9. Re-apply power to spa and turn thermostat up to cause heater to come on. Listen to spa to see if operation sounds normal.

10. Turn multi-meter on and plug probes into the meter as directed by the meter instructions. You will be testing voltage.

11. Carefully place one probe on one of the element terminals.

12. Carefully place the second probe on the other heater terminal.

13. Read your multi-meter for voltage at the element.

14. Remove both probes, and write down the voltage you read from your test.

15. Turn power off to spa. If you received “0″ volts at the heater terminal, your problem is most likely not the heater element. If you received the correct voltage at the heater terminals, you must now check for amp draw at your heater.

Check amp draw at heater element

1. Turn power off to spa. (This means to shut off source voltage to the spa at the breaker or disconnect).

2. Find wires that connect to the spa heater terminals.

3. Clamp one wire that goes to your heater element, with your amp-meter.

4. Make sure all wires are secure and safe for operation.

5. Re-apply power to your spa and turn thermostat up to cause heater to come on.

6. Check amp-meter to see if amps are being drawn by your heater element.

7. Turn Power off to spa.

8. Write down the amp reading from your amp-meter. If you received an amp reading from your heater. Your heater element is working. You need to look for problems elsewhere.

*I f you received the proper voltage at the heater terminals, but received no amp reading when the spa was operating, the heater element is bad.

What to do if heater element tests good during these tests, but does not heat spa, during normal operation. Remember step 5 in the voltage test. You removed the filter. Check condition of filter, run spa for 24 hrs without filter in place to see if spa heats normally. If spa heats normally with filter out, replace filter with new.

Now be aware every hot tub / spa is different. If you have a digital system, make note of any displayed error codes. The new digital systems on the spas today will do much of the troubleshooting for you if you know what it is telling you, but let’s leave that for another article though.

Bearing Distributor


26
Apr 11

How to adjustment HP Pavilion DV5t AC Adapter

My hp notebook uses a HP Pavilion DV5t AC Adapter(http://www.usadapter.com/Laptop-HP-Adapter/HP-Pavilion-DV5t-AC-Adapter.html) that has an output voltage of DC18.5V 3.5A. One day the hp AC Adapter stopped working.
I decided to try to repair the adapter. In the past I repaired several switching power supplies of PCs and also one AC-power adapter of a Asus notebook. I found out that most of the supplies had similar defects. Often they are ease to locate and to repair.
This Instructable shows how to repair a hp AC Adapter but using the same principles it can work with any switching power supply.