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Hello, I have a simple question.Why do I have to remove a diode from the circuit if, I want to test if it's OK?Thanks.
Quote from: nForce on October 05, 2019, 12:44:20 pmWhat about other components: resistors, capacitors, inductors? I think, here you can leave the components in the circuit. Only if we plug out the power supply, right?No. Capacitors are seldomly used as a single. How are you doin to separate the capacitance/leakage from the one being tested and the others on the same bus?
What about other components: resistors, capacitors, inductors? I think, here you can leave the components in the circuit. Only if we plug out the power supply, right?
Quote from: Zero999 on October 05, 2019, 04:16:52 pmThe ESR of capacitors can be quite often tested in circuit, because the capacitor should form the lowest impedance path at AC.Assuming you don't have an power-RF ground plane pair beneath it, and assuming the interconnection between caps are long and inductive.Practically for a multilayer board, you need many MHz to see the difference, and I wonder not many people will spend money on a VNA just for measuring dead caps.I don't think even 100kHz LCR meters are common, and they won't really address each one if you have 10 0402 MLCCs scattered around a small board.
The ESR of capacitors can be quite often tested in circuit, because the capacitor should form the lowest impedance path at AC.