Specification:
| Product name | Ultrasonic impedance analyzer |
| Frequency range | 1kHz~500kHz |
| Measurement Index | All the parameters, the graph |
| Measurement Accuracy | <0.5% |
| Frequency Accuracy | ±10ppm |
| Impedance Range | 1Ω~1MΩ |
| Size | 24*19*10cm |
| Test environment temperature | 10～40℃ |
| Frequency Step | 0.1Hz～Any |
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.
