FAQ: What are the maximum values for Zr (impedance at resonance) and minimum for mechanical quality factor Qm of ultrasonic parts?

The TRZ® Software default criteria for Zr maximum value are:
50 Ohms for a transducer;
70 Ohms for transducer + booster;
100 Ohms for transducer + booster + horn.

The TRZ® Software default criteria for Qm minimum value are:
250 for a transducer;
700 for transducer + booster;
1000 for transducer + booster + horn.

Pre-programmed judgment criteria of the TRZ Software for converters, boosters and sonotrodes.

Pre-programmed judgment criteria of the TRZ® Software for converters, boosters and sonotrodes.

Please, see the TRZ® Software criteria spreadsheet showing up to 40 kHz in the image (TRZ is able to measaure up to 200 kHz). These are generic values for ultrasonic welding devices and should be refined in accordance with each specific case or application by the user.

Learn more about testing converters and acoustic stacks.
Learn more about preventive maintenance of ultrasonic acoustic stacks.