# Measuring current

Hi people, i got a question regarding current measurement.
Is there a way to measure it, other than by putting the ammeter in series?
How do they find the current output from one IC to another IC and there isnt any resistance or cap between them?

Thank you.

The current into the input is simply a function of ohms law. As long as the reactive part is not significant, if the output voltage is known and the input impedance is known, one simply divides the output voltage by the input resistance. If the reactive component is significant, one still divides the voltage by the impedance but the calculations are more complex.

f95toli
Gold Member
One way to measure currents between ICs etc is to use probe which measures the current "indirectly" via the magnetic field. The accuracy isn't great, but it works

This is also a very commong technique when dealing with higher currents through e.g.; you can buy so called current clamps that can be be with an ordinary multimeter.

Really, the best way is to use just to use a shunt resistor and measure the voltage across it. Hall effect sensors can work as well but are typically very inaccurate as f95toli said. Since you mentioned that you want to measure current going to ICs, i.e. milliamps, your only practical choice is to just use a shunt resistor.

Since you mentioned that you want to measure current going to ICs, i.e. milliamps, your only practical choice is to just use a shunt resistor.

I suspect that he is referring to ICs already soldered onto a board

sophiecentaur