使用伏米，电流表和其他电子测量仪器和设备，检查和测试已安装电气设备及仪器，定位电气故障和检查其操作。

Inspect and test installed electrical equipment and apparatus to locate electrical faults and check their operation, using volt meters, ammeters and other electrical test instruments and equipment.

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数字频率计是近代电子技术领域的重要测量工具之一，同时也是其他许多领域广泛应用的测量仪器。

Digital cymometer is one of the important measurement tools in the field of modern electronic technology, it is also widely used in many other areas of the measuring instruments.

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