Shield current source is controlled by using variable power circuit, this greatly improves dynamic range.
深、浅屏流源采用可变功率控制，提高了仪器的动态范围。
The main function of variable frequency power source is to change the current AC power to the needed stable pure power.
变频电源的主要功用是将现有交流电网电源变换成所需频率的稳定的纯净的正选拨电源。
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