The invention provides an apparatus and a method for rubbing the alignment layer in the LCD substrate. In order to allow for an optimal utilization of the working surfaces of the sonotrode, it is proposed to move or mount the sonotrode in a desired position with respect to the element that connects the ultrasonic welding machine to the sonotrode by rotating the sonotrode around its longitudinal axis as well as a transverse axis running perpendicular thereto. A hydraulic actuator shaft is attached to a mechanism that converts the rotary motion of an electric motor to linear motion. The reference symbol is selected when it matches the first symbol. The signals of the four channels of an active source are sent to the four channels of the destination, without noticeable crosstalk. The probe circuit includes a sampling clock supplying section that outputs a sampling clock having a predetermined frequency, and a sampling section that outputs, outside the electronic device, a probe output signal of which frequency is lower than a frequency of the response signal and which corresponds to a sampling result obtained by sampling the response signal using the sampling clock.