Purpose of Preload Measurement During Transducer Assembly

• Ultrasonic bolt-clamped transducers require a controlled amount of bolt preload in order to operate effectively
• The best way to ensure sufficient and repeatable preload application, the electrical charges generated in the piezoceramic rings should be measured and targeted in the preloading process.

Ultrasonic Advisors' Preload Measurement Probe

• Ultrasonic Advisors offers a preloading probe which attaches to a general multimeter and transducer electrodes.
• The voltage measured by the multimeter is related to the generated charge on the crystals by the following equation:
• Preload [N] = 100e-6 * Voltage * Piezo Charge Coefficient * Number of Crystals
• A handy calculator can be found here to find the average stress as a function of the voltage measured: https://www.ultrasonicadvisors.com/preload-calculatorv1
• A good starting point for the target stress is 20MPa to 40MPa.

Purchase information

• Purchase includes:
• Domestic (USA mainland) and international shipping
• 1 year warranty
• Probe box, 2x BNC L connectors, BNC to multimeter connector, short BNC cable, and BNC Alligator cable
• Transducer and multimeter shown in product image are not included
• Email technical support for correct use of measurement probe
• Please contact Ultrasonic Advisors with any questions at husain@ultrasonicadvisors.com
• You will receive an automated email after purchase, and a personal email up to 24 hours after the purchase with shipping details.