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im trying to find inductance of the air core coil,i read that in LC parallel circuit with known capacitor value we can find unknown inductance value by the formula

enter image description here enter image description here enter image description here enter image description here

so need to find 'f' resonant frequency.to find L

Im getting that resonant frequency in normal inductor (resistor like) but not in air core coil. check the scope output with normal inductor and air core coil below.

1).with normal inductor 42uh getting resonant frequency

2). this is the output of air core coil,i didnt get the waveform like normal inductor,not able to find resonant frequency. enter image description here

3) the coil i used ,68mh , i checked that inductance value with LCR meter enter image description here

why the resonant frequency is not coming in air core coil?,how do i find inductance value of air core coil.?

im trying to find inductance of the air core coil,i read that in LC parallel circuit with known capacitor value we can find unknown inductance value by the formula

enter image description here enter image description here

so need to find 'f' resonant frequency.to find L

Im getting that resonant frequency in normal inductor (resistor like) but not in air core coil. check the scope output with normal inductor and air core coil below.

1).with normal inductor 42uh getting resonant frequency

2). this is the output of air core coil,i didnt get the waveform like normal inductor,not able to find resonant frequency. enter image description here

3) the coil i used ,68mh , i checked that inductance value with LCR meter enter image description here

why the resonant frequency is not coming in air core coil?,how do i find inductance value of air core coil.?

im trying to find inductance of the air core coil,i read that in LC parallel circuit with known capacitor value we can find unknown inductance value by the formula

enter image description here enter image description here enter image description here

so need to find 'f' resonant frequency.to find L

Im getting that resonant frequency in normal inductor (resistor like) but not in air core coil. check the scope output with normal inductor and air core coil below.

1).with normal inductor 42uh getting resonant frequency

2). this is the output of air core coil,i didnt get the waveform like normal inductor,not able to find resonant frequency. enter image description here

3) the coil i used ,68mh , i checked that inductance value with LCR meter enter image description here

why the resonant frequency is not coming in air core coil?,how do i find inductance value of air core coil.?

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Getting resonant frequency in LC circuit with L as air core coil

im trying to find inductance of the air core coil,i read that in LC parallel circuit with known capacitor value we can find unknown inductance value by the formula

enter image description here enter image description here

so need to find 'f' resonant frequency.to find L

Im getting that resonant frequency in normal inductor (resistor like) but not in air core coil. check the scope output with normal inductor and air core coil below.

1).with normal inductor 42uh getting resonant frequency

2). this is the output of air core coil,i didnt get the waveform like normal inductor,not able to find resonant frequency. enter image description here

3) the coil i used ,68mh , i checked that inductance value with LCR meter enter image description here

why the resonant frequency is not coming in air core coil?,how do i find inductance value of air core coil.?