Recent content by imsmooth

Did a lot of twisting and used a common mode choke. I was able to get the measured voltage down from 3.4v to 0.5v. This gives a current of about 38,000A which is still more than the 200A I should have measured. It seems that even the slightest stray inductance throws off this method of measuring...

Thank you. I should have done the calculation first.

I thought this is what you meant. Why the single turn from the lead on the left? Why not have both test leads meet midway in the section under test and start twisting there?

Any chance you could sketch this?

The earth rotates faster than the moon orbits. Thus, the moon appears to move from East to West each day. The shadow of the moon during an eclipse as it moves along the curved earth makes it move faster and we see it move West to East. My question is If a solar eclipse happens near noon and...

What do you mean by "doing a single turn"? Are you saying to twist the test leads and then wrap the pair around the toroid? The single-turn with one of the leads is throwing me off.

I've twisted the differential probe wires. I'll try to put more twist on them.

I tried to do what you said and you are correct. When I create a smaller measurement loop the measured voltage goes down. It seems like it would be very difficult at these frequencies to just measure the conductor's resistance without the added inductive impedance.

This correlates with what I measured. What formula is this?

I was using a differential probe. The tank is floating and not grounded.

No. The capacitor and work coil voltages cancel. The actual voltage across the coupling transformer is much lower. The current, thought, is very high. I'm doing it just to understand how these things work...and to heat metal.

I don't want the resistance of the tank. I want the resistance of the 1 inch segment and current through it. My question is about the discrepancy between my measurements. Am I making the TEST voltage measurement incorrectly?

I want to measure tank circuit currents using *different* methods. Below is the tank circuit. The coupling transformer has 20 turns and has 10A @ 80khz going through it. This means there should be a maximum of 200A in the tank (20:1 turns ratio). I measure the voltage across the 2.6uF capacitor...

Would you have any idea if commercial induction units use software or hardware to control the driving frequency?

By cutoff I mean when the CST reaches a threshold voltage this will then initiate raising the tank frequency above the resonant value. If the current is above, say, 40A @ 75khz the CST will have a 40v value. The circuitry will then push the frequency higher until the CST value falls below 40v...