I have seen that trace impedances in PCB's are maintained 50 ohm & so on. How to measure this impedance using a simple multimeter?
Electronic – How to measure trace impedance
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Best Answer
There is no* way to measure trace impedance with a simple multimeter.
Measuring trace impedance requires, at minimum, an oscilloscope and an impulse generator of some sort. Here's an article about how you can measure the impedance of a cable (or PCB) with a signal generator.
Doing "Proper" impedance measurements requires a special tool, called a network analyzer.
* No reasonable way, in any event. There may be ways to abuse a specific model of meter in a specific manner to get a approximate result, but it won't be generalizable.