如果不能找到设备的特定接口，与销售商明确提供的标准接口比较信号频率和源线特性。
If you don't find devices specifically for your interface, compare your signaling frequencies and source-and-line characteristics with those of interface standards that the vendor explicitly supports.
该校准仪是用于校准各种电子电压表基本误差的专用标准仪器，具有定点频率下正弦波信号输出的标准电压源。
This normalizing device is a standard instrument used to calibrate the intrinsic errors of the various kinds of electronic voltmeters.
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