The Channel Definition Instrument does not program an external amplifier. It is used to define channel names and calibration values when electrical signals are directly connected to the A/D converter or an external amplifier is used which can not communicate directly with IMAGO Record. The definition of channel names is essential for recording. All channels you want to record must have a name define via an instrument. The calibration coefficient is used to convert recorded voltages to a physical unit. Each channel has an input for a calibration factor. If e.g. 1V = 500Newton, the number 500 will be used to convert the recorded voltage into the physical unit Newton and Newton will be stored as physical unit of the channel. Please note that depending on your setting in Extras -> Options numbers need to be input with the correct decimal separator. The offset of each channel can be adjusted. The offset changes immediately and can be viewed in the Calibration window. The offset is input in Volts.