| 摘要 |
The invention comprises an assembly 20 for capacitively detecting an object 21 on a support structure 23 comprising at least one electrode 25 being arranged in the vicinity of the support structure 23, and at least one cable 29 being connected to the at least one electrode 25, said at least one cable 29 having a first conductor 28 and a second conductor 26, said first conductor 28 being connected to a series connection of a DC source 31 and a first AC source 33, and a control device 37 being arranged to: control said DC source 31 to provide a predetermined DC voltage to said at least one electrode 25 to provide a clamping force on said object 21, and control said first AC source 33 to provide a predetermined first AC voltage with a first amplitude and a first phase via said first conductor 28 to said at least one electrode 25 for capacitively detecting said object 21. New about the invention is that said assembly 20 comprises a second AC source 35 connected to said second conductor 26 and said control device 37 is arranged to control said second AC source 35 to provide a predetermined second AC voltage to said second conductor 26, said second AC voltage having a second amplitude and a second phase, respectively, which are substantially equal to the first amplitude and first phase, respectively. <IMAGE>
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