electronic_component_testing_cheatsheet
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electronic_component_testing_cheatsheet [2022/02/23 12:35] sausage |
electronic_component_testing_cheatsheet [2022/02/24 01:59] sausage [Thermistors] |
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| When doing a repair job, it's nice to have a handy testing cheatsheet for a range of electronic components. So far I haven't found one, so I created my own here which covers everything from very basic fuses and resistors to MOSFETs, even Gas Arrestor Tubes. All using a multimeter and other tools. I've tried to cater for absolute beginners to intermediate hobbyists. | When doing a repair job, it's nice to have a handy testing cheatsheet for a range of electronic components. So far I haven't found one, so I created my own here which covers everything from very basic fuses and resistors to MOSFETs, even Gas Arrestor Tubes. All using a multimeter and other tools. I've tried to cater for absolute beginners to intermediate hobbyists. | ||
| - | My favourite tools are the Anmeg AN8009 mutimeter and GM 328 component tester. You can find them both on Aliexpress. | + | My favourite tools are the [[https://www.aliexpress.com/wholesale?SearchText=AN8009 | Aneng AN8009 multimeter]] and [[https://www.aliexpress.com/wholesale?SearchText=gm328 | GM 328 component tester]]. You can find them both on Aliexpress. |
| {{:component-cheatsheet:anmeg-an8009.jpg?direct&200|}}{{:component-cheatsheet:gm328.jpg?direct&300|}} | {{:component-cheatsheet:anmeg-an8009.jpg?direct&200|}}{{:component-cheatsheet:gm328.jpg?direct&300|}} | ||
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| An OL reading means ''open line'' or ''broken connection''. No current will pass, so it's a bad resistor. | An OL reading means ''open line'' or ''broken connection''. No current will pass, so it's a bad resistor. | ||
| - | An almost 0Ω reading is a short. Of course, there are very low value resistors, for example BROWN BLACK SILVER GOLD, totaling 0.02Ω, so always check the resistor chart to be sure. | + | An almost 0Ω reading is a short. Of course, there are very low value resistors, for example BROWN BLACK SILVER GOLD, totalling 0.02Ω, so always check the resistor chart to be sure. |
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| ===== Switches ===== | ===== Switches ===== | ||
| - | You can never under-rate the testing of a switch. Switches can break: it's continutity can fluctuate. A switch can be ''normally open'' (the most common type) or ''normally closed''. | + | You can never under-rate the testing of a switch. Switches can break: it's continuity can fluctuate. A switch can be ''normally open'' (the most common type) or ''normally closed''. |
| {{ :component-cheatsheet:switch-testing.png?direct&400 |}} | {{ :component-cheatsheet:switch-testing.png?direct&400 |}} | ||
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| The continuity tester on your multimeter is the mode to use. | The continuity tester on your multimeter is the mode to use. | ||
| - | - If it's a normally open switch, ensure there is only continutity when it is pressed. | + | - If it's a normally open switch, ensure there is only continuity when it is pressed. |
| - | - If it's a normally closed switch, ensure there only continutity when it is not pressed. | + | - If it's a normally closed switch, ensure there only continuity when it is not pressed. |
| - | An example of an interesting switch break [[vulcan_dishlex_milano_dishwasher_repair|in a recent dishwasher repair]]: with a microswitch that would click when pressed... it sounded like it was activated, but unless you pressed it further, there was no continutity. Needed replacing. | + | An example of an interesting switch break [[vulcan_dishlex_milano_dishwasher_repair|in a recent dishwasher repair]]: with a microswitch that would click when pressed... it sounded like it was activated, but unless you pressed it further, there was no continuity. Needed replacing. |
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| These are resistors that vary their value according to the temperature. The ohms value can go up or down when the temperature increases. | These are resistors that vary their value according to the temperature. The ohms value can go up or down when the temperature increases. | ||
| + | |||
| + | {{ :component-cheatsheet:thermistor-on-ice.png?direct |}} | ||
| Switch to the resistance setting. | Switch to the resistance setting. | ||
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| You can do the same by walking outside in the warm sun and observe the reverse effect. | You can do the same by walking outside in the warm sun and observe the reverse effect. | ||
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| - | ===== Varistors ===== | ||
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| - | A varistor is a resistor where the value of the resistance varies depending on how much voltage is applied to it. I have no method or resources for testing these yet. | ||
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| - | These components are very frustrating to identity because they often are almost identical to some dipped ceramic capacitors. And information for differentiating the marking is few and far between. So here is one site at least that helps teach you how to [[http://epicbeardquest.blogspot.com/2015/03/is-that-varistor-or-capacitor.html | identify the different markings between a varistor and a capacitor]]. | ||
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electronic_component_testing_cheatsheet.txt · Last modified: 2024/05/19 04:40 by sausage
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