From the course: Electronics Foundations: Fundamentals
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Measure direct current
From the course: Electronics Foundations: Fundamentals
Measure direct current
- When I measure current with my DMM, I always connect the black probe to the center comm port first. And then I need to decide if I'll be measuring a small or large current, so I can connect the red probe to the appropriate port. For this example, I'll be measuring the current through a simple circuit, which consists of a resistor and an LED. Using ohms law, I can calculate that the current through this circuit should be around 15 milliamps. that falls well within the range of 200 milliamps that the right DMM port can handle. So I connect my red probe to the right side. If I expected my circuit to exceed or even be close to the 200 milliamp limit of the right port, I would connect the red probe to the other port, which can handle up to 10 amps just to be safe. Next, I'll turn the selector knob to choose the smallest range that exceeds the current I expect to be measuring. Since I expect to measure around 15 milliamps…
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