bell ringing transformer

例句：

1. 1. The bell ringing transformer is used to change the frequency of the signal.
   铃铛转换器用于改变信号的频率。
2. 2. The bell ringing transformer was designed to improve the accuracy of the measurement.
   铃铛转换器被设计来提高测量的准确性。
3. 3. The bell ringing transformer was installed in the factory to test the new product.
   铃铛转换器被安装在工厂中以测试新产品。