How To Measure Air Core Inductor

Using an inductance meter measure the inductance of that rod. What is an air core coil.

Inductance

Wurth Elektronik 744912147 Air Core Inductor 47 Nh 3 A We Cair Series 5 4 83mm X 3 81mm X 4 2mm 0 0056 Ohm

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Using the drill bit as a template wrap the wire counting up to the number of desired turns.

How to measure air core inductor. Youll need to read the peak current in amperes and the amount of time between voltage pulses in microseconds. Allow 3cm of wire clear before starting the turns and keep the wire taught while turning. As shown in the equation inductance of the air core inductor varies as the square of the number of turns.

Connect the 50 ohm output of the function generator to the oscilloscope and select a sine wave signal. The length of the coil used in the inductor should be equal to or 04 times the diameter of the coil. Record the inductance as l and the 20 turns as n calculate the al value of the ferrite inductor.

Air core inductor coil inductance calculator. To measure inductance on a voltage current slope connect the inductor coil to a pulsed voltage source and keep the pulse below 50 percent. Adjust the output voltage of the generator to 1 v peak peak.

For niftymitter make 4 complete turns as close together as possible. Connect the unknown inductor parallel to the oscilloscope fig. The al value is the base relationship between the inductance with a given ferrite core and the number of turns.

Thus the value l is multiplied four times if the value of n is doubled. But most of the inductors especially the ferrite cored and air cored ones for some reason does not seem to have any sort of marking on them. Then you can set up the current monitors and begin your measure.

This becomes quite annoying when you have to select the right value of inductor for your circuit design or have salvaged one from an old electronic pcb and wanted to know the value of it. This covers the cases where there really is just air inside as well as windings upon a different insulator such as bakelite glass or ptfe etc. In this part were talking about the toroid core inductors and the characteristic of ferrite and iron powder cores and when we must use ferrite core and when we must use iron powder core.

Kogawa has a video for this step on his site here wmv. The following is a design tool which calculates the inductance of an air core inductor. Well use the term air core coil to describe an inductor that does not depend upon a ferromagnetic material to achieve its specified inductance.

Adjust the frequency of the generator to approximately 20 khz.