while using the equation editor via the pull down windows (manual mode) a trace (tr1, tr2, ...) is highlighted and the operation of the the equation editor is applied and the trace reflects the operation of the editor. while using dcom, having 2 channels, multiple traces in each channel, selecting a trace (ie. s21), then applying an equation to the selected trace, does not update the desired trace. how does the equation editor select which trace gets updated? within the program the measurement and trace are selected and highlighted before the equation command is executed.