The key switches between measure and parameter modify. In the latter position one can select a parameter using the arrow keys. The selected parameter can be changed by pressing the modify key until one finds the new value. To select this new value press valid. Press modify - display blinks.
Press modify again to cycle through the ranges.
Press valid to select the wanted value. Switch keyswitch back in measure position. It takes between 10 min and 30 min to stabilize the electrometer after changing range. This is done automatically in bscans. Note that it takes between 10 min and 30 min for the electrometer to stabilize after a change of range.