Testing Ultrasonic Transducers with a Multimeter
Ultrasonic transducers have more or less applications in many industries today. Different fields such as underwater communication, underwater ranging, underwater terrain scanning, wind speed and direction, mouse and bird repelling, recording shielding, and drone collision avoidance make ultrasonic transducers of great value. Therefore, the quality of ultrasonic transducers will also directly affect whether these applications can be performed normally. How to use a multimeter to detect the quality of the ultrasonic transducer?
Using a multimeter to detect ultrasonic transducers can detect two aspects. One: the quality of the piezoelectric ceramic sheet: the second: the sensitivity of the ultrasonic transducer. Let's talk about how to use a multimeter to detect the quality of ultrasonic transducers.
Detect the sensitivity of the ultrasonic transducer: use a multimeter with a DC voltage of 2.5V, the red test lead is connected to the lead of the metal piece of the transducer, the black lead is connected to the ceramic surface of the transducer (there are also smaller round metal pieces attached to the lead), and the left thumb is connected to the lead. After the index finger is squeezed on the transducer, it is quickly released. At this time, two voltage signals with opposite polarities should be generated. That is, the needle swings to the right to return to zero, and then swings to the left to return to zero. The greater the swing, the higher the sensitivity of the transducer.
Detect the quality of piezoelectric ceramic sheets: You can check the capacitance, and if the parameters are abnormal, it is regarded as an inferior product.
