How To Perform A Simple Voltage Test On Circuit Board

Well, I’ve got many emails asking me to show them how to perform a voltage test for troubleshooting purposes. Although many of them already know how to test electronic components and be able to repaired electronic equipment, learning some simple voltage test could help them to diagnose the fault even faster. In this article, I’m assuming that you have some electronic repair knowledge and understood how SMPS work and etc. Alright let’s start! Performing Voltage Test On Resistor In a circuit board there are lots of electronic components particularly the resistors and you wish to place your test probe on some of the resistors test points. The...

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Testing a MOSFET

Metal Oxide Semiconductor Field Effect TransistorThis testing procedure is for use with a digital multimeter in the diode test-range with a minimum of 3.3 volt over d.u.t. (diode-under-test). If your multi-meter is less than that it will not do the test. Check your meter manual for the specs. Connect the 'Source' of the MosFet to the meter's negative (-) lead. 1) Hold the MosFet by the case or the tab but don't touch the metal parts of the test probes with any of the other MosFet's terminals until needed. Do NOT allow a MOSFET to come in contact with your clothes, plastic or plastic products, etc. because of the high static voltages it can generate. 2) First, touch the meter positive lead onto the MosFet's 'Gate'. 3) Now move the positve probe to the 'Drain'. You should get a 'low' reading....

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