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because dc current will overflow. This problem is more serious when the frequency is relatively low. By applying dc current bias, it allows higher ac signal amplification. A 16bit DAC is used for this purpose. If dc current is not expected to be large and the frequency is high, one may not want to bias dc current.大家可以自行判斷。 最后一項(xiàng)是靈敏度,說(shuō)明書給出的解釋是The sensitivity scale setting is automatic by default. During the experiment, the system tests the current size and determines the proper sensitivity scale. It u