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Working principle of variable frequency series resonance test set

July 01, 2023
It is known that when the loop frequency f = 1/2π √ LC, the loop resonates. At this time, the voltage on the sample is Q times the output voltage of the excitation high voltage terminal. Q is the system quality factor, that is, the voltage resonance multiple, which is generally several tens to one hundred or more. Firstly, the loop is resonated by adjusting the output frequency of the variable frequency power supply, and then the output voltage of the variable frequency power supply is adjusted under the condition of loop resonance to make the sample voltage reach the test value. Due to the resonance of the loop, the smaller output voltage of the variable frequency power supply can produce a higher test voltage on the sample CX.
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