signal tester

例句：

1. 1.The engineer used the signal tester to diagnose the problem with the communication system.
   工程师使用信号测试器诊断通信系统的故障。
2. 2.The technician was tasked with testing the signal strength of the new satellite network.
   技术人员被指派测试新卫星网络的信号强度。
3. 3.The signal tester detected a weak signal that needed further investigation.
   信号测试器检测到一个弱信号，需要进一步调查。