Is it Possible to Display the RMS and DC Values of Voltage/Current at the Same Time?

Unfortunately the WT3000 cannot display the RMS and DC values of voltage/current at the same time, even if you use the user-defined function feature. You must select either RMS or DC mode in the Voltage/Current Range Mode menu.  
It is possible to display the RMS and MEAN values of voltage/current simultaneously on the WT3000.

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