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electronic_component_testing_cheatsheet [2022/02/27 07:42]
sausage Thank yous.
electronic_component_testing_cheatsheet [2022/03/02 22:38] (current)
sausage [Conclusion]
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 ====== Electronic Component Testing Cheatsheet ====== ====== Electronic Component Testing Cheatsheet ======
  
-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. All using a multimeter and other tools. I've tried to cater for absolute beginners to intermediate hobbyists.
  
 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. 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.
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 For capacitance tests, always best to test off the PCB if possible, though you can be lucky on the board. Use the capacitor test on your multimeter if you have one, and if you get the expected reading in nano-farads or micro-farads,​ then all well and good.  For capacitance tests, always best to test off the PCB if possible, though you can be lucky on the board. Use the capacitor test on your multimeter if you have one, and if you get the expected reading in nano-farads or micro-farads,​ then all well and good. 
  
-For ceramic caps on the board, sometimes I like to test these using a continuity test. Placing the probes at either end, there will be a short beep at the cap charges, and will stop when it reaches capacity. Swap the leads around and it will beep again until it reaches capacity.+For ceramic caps on the board, sometimes I like to test these using a continuity test. Placing the probes at either end, there will be a short beep as the cap charges, and will stop when it reaches capacity. Swap the leads around and it will beep again until it reaches capacity.
  
 If you get an unexpected readings for any cap, remove from the board and try again after discharging it.  If you get an unexpected readings for any cap, remove from the board and try again after discharging it. 
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 For MOSFETs, you'll need to search for your part to identify which pins are the Gate, Drain and Source pins. For MOSFETs, you'll need to search for your part to identify which pins are the Gate, Drain and Source pins.
  
-Place you finger on all three pins for a moment to de-charge the MOSFET. MOSFETs have a little capacitance in them which is handy for the test. +Remove from the PCB and place your finger on all three pins for a moment to de-charge the MOSFET. MOSFETs have a little capacitance in them which is handy for the test. 
  
 Switch to diode setting. Switch to diode setting.
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 ---- ----
  
-===== Gas Glass Surge Arrestors / Gas Glass Discharge Tubes ===== 
  
-{{:​component-cheatsheet:​gas-surge-testing.png?​direct |}}I include this because they look like a cross between a zener diode and the colour bands of a resistor. Little is written about them, but they can be located in some switch mode power supplies. ​ 
- 
-Switch to continuity mode. 
- 
-Connect the probe at both ends. 
- 
-If you get a continuity beep then the tube is good. Otherwise it is bad. 
- 
----- 
  
 ===== Thermistors =====  ===== Thermistors ===== 
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 ===== Transformers ===== ===== Transformers =====
 +
 +<WRAP center round alert 90%>
 +Transformer voltages can be very dangerous. This section assumes there is no power and the transformer is removed from the circuit.
 +</​WRAP>​
 +
 +
 Transformers are a whole can of worms (actually a can of iron and copper), so I won't go into great detail here. I'll just outline the regular steps you can take for sanity testing a transformer. Transformers are a whole can of worms (actually a can of iron and copper), so I won't go into great detail here. I'll just outline the regular steps you can take for sanity testing a transformer.
  
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 A massive thanks to Wayne@WaynesWorld,​ Andrew V and Keystone for proofing this article. Really appreciate it. A massive thanks to Wayne@WaynesWorld,​ Andrew V and Keystone for proofing this article. Really appreciate it.
 +
 +
 +===== Coming Next =====
 +PNP transistors :: Gas Discharge Tubes
electronic_component_testing_cheatsheet.1645947731.txt.gz ยท Last modified: 2022/02/27 07:42 by sausage