开关阻抗可以在校准期间，使用参考负载提供。
The switch impedance may be provided during calibration using a reference load.
对测试中开关电源提供更低的源阻抗﹐因此它会传送更高的峰值电流。
Lower source impedance to the switching power supply under test, thus it can deliver higher peak current.
具体地说，如果装置为低阻抗，那么通过开关的电流就会引起很明显的压降。
In particular, if the devices have low resistance, the current flowing through the switches may cause a significant voltage drop.
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