Specification:

How to Guide Production of Impedance Analyser

To evaluate the performance of an oscillator or vibration system, it is necessary to analyze the parameters and admittance curves.
1) Parameters:
The impedance analyzer can be used to evaluate the performance of various devices such as piezoelectric ceramic, piezoelectric transducer, whole vibration system (transducer plus horn, mould) and so on. The most important parameters of the impedance analyzer for the analysis of ultrasonic devices are as follows:
Fs: Mechanical resonance frequency, that is, the working frequency of the vibration system, should be designed as close as possible to the expected value, and must match the working point of the power supply.
For the cleaning machine, the higher the resonance frequency consistency of the oscillator, the better.
For plastic welding machine or ultrasonic processing, the resonant frequency of the oscillator will deviate from the working point when the horn or die design is unreasonable.

R1: Dynamic resistance, piezoelectric oscillator series branch resistance, in the same support conditions, the smaller the better. For cleaning or welding oscillator, it is usually between 5 and 20. If it is too large, the oscillator or vibration system will have problems, such as circuit mismatch or low conversion efficiency and short oscillator life.
Qm: Mechanical quality factors, determined by conductivity curve method, Qm = Fs/(F2-F1), the higher the Qm, the better, because the higher the Qm, the higher the efficiency of the oscillator; but Qm must match with the power supply, when the Qm value is too high, the power supply can not match.

For the cleaning oscillator, the higher the Qm value, the better. Generally speaking, the Qm of cleaning oscillator should be between 500 and 1000. If it is too low, the efficiency of oscillator is low, if it is too high, the power supply can not match.

For ultrasonic welding or processing, the Qm value of the oscillator itself is generally about 500-1000, the whole system is 1500-3000, if too low, the vibration efficiency is low, but it can not be too high, because the higher the Qm, the narrower the working bandwidth, the power source is difficult to match, that is, the power source is difficult to work at the resonance frequency point, the equipment can not work.CT: The capacitance value of free capacitor and piezoelectric device at 1 kHz is the same as that measured by digital capacitance meter. By subtracting the dynamic capacitance C1 from this value, the true static capacitance C0, C0 = CT-C1, can be obtained. The inductance should be used to
balancethe 20.In the circuit design of cleaning machine or ultrasonic processing machine, balancing C0 correctly can improve the power factor of power supply. There are two ways to use inductance balance, parallel tuning and series tuning.

Fp: Anti-resonant frequency, the resonant frequency of parallel branch of piezoelectric oscillator. At this frequency, the impedance Zmax of piezoelectric oscillator is the largest. If the anti-resonant impedance Zmax is very low, the oscillator has problems.
2) graphics

The impedance analyzer provides five kinds of coordinate charts, among which the logarithmic charts are of great significance for the detection of piezoelectric devices. The vibration performance of piezoelectric oscillator or vibration system can be judged directly by logarithmic coordinate diagram, which is more intuitive and practical.