Each channel can be set individually. For example, a 4~20mA current input must use the 4~20mA setting on the Mode Select switch. Each switch channel corresponds to the matching. The entire setup with proper connections has been depicted as follows:- Scientech Fiber Optic Trainer kit is used to perform this particular experiment. It allows the choice of transmitting a 1KHz square wave and up to 1KHz of sine wave using a Fiber-Optic cable. The Fiber-Optic. THEORY: Fiber optic links can be used for transmission of digital as well as analog signals. Also explains the procedure to do the experiment The objective of this experiment is to measure propagation loss in plastic fiber provided with the kit at wavelengths of 660 nm and to measure the bending loss. These rugged modules are designed to be mounted on any standard T-35 DIN rail or wall surface. It includes a Transmitter Card for converting analog.