Yes you acquire simultaneously data for both channels in labview-
In the 3000aExampleBlock.vi- for example press ctrl-E for block diagram.
Find the unconnected control wire for Channel B control, its next to Channel A control on the ‘PS3000 Settings’ block.
Right select ‘create ‘ sub menu ‘Indicator’ (You can then right on the Indicator and select ‘view as icon’ if needed)
Double click on the ‘Indicator’ icon so it will appear in the Front panel view.
Go back to the Block diagram window and select channel A Buffer and the graph ‘Indicator’ copy and paste these.
Rename graph copy to Channel B, click on the ‘Channel A Buffer’ copy and select Channel B from the drop down.
Connect a wire from ‘Channel B Buffer' to same wire going between ‘PS3000 Block’ and ‘channel A Buffer’.
For the 3207B-
Max. Analogue bandwidth is 250 MHz at -3dB,
Max. sample rate for two channels enabled is 500MS/s