FAQ: : Our voltage driver (generator) is able to perform resonant frequency (Fr) tracking. But the resonant frequency Fr that we obtain from TRZ® Analyzer did not match the value we got from our driver tracking. I can see that the max output voltage of TRZ is 10 Vpp. My question is: how can we verify our transducer using TRZ® Analyzer at higher voltages? Mr. A.B.
TRZ® Analyzer is able to operate at low voltages only. Do you remember the frequency discrepancy between the TRZ® Analyzer and the device at high power? A few Hertz difference is expected because of the measurement uncertainties and nonlinearities at high power. If the difference is several tens or hundreds of Hertz, the driver power output may be poorly tuned to the transducer. Usually, the driver output inductor must be tuned to the piezoceramics capacitance at the transducer nominal frequency.
The behavior of ultrasonic transducers become nonlinear and quite complex at high voltage. The resonance frequency decreases with increasing excitation and becomes dependent on the sweep direction. If at low voltage you have a single resonance frequency, at high voltage you have a broad range of possible results depending on the voltage and sweeping direction. Performing the tests at low voltage does not reproduce the conditions of real use, but it allows standardization and the results comparison.
Learn more about TRZ® Analyzer.