The synchro transmitter receiver demonstrater unit is designed to study of remote transmission of position in AC servo mechanisms. These are alsocalled as torque transmitter - receiver. The unit has one pair of transmitter -receiver synchro motors, powered by an isolated ac inbuilt supply. Socketsare brought upon the panel to make connections with attenuated compensatedoutput in ratio of 1 : 10 for waveform observation. The synchro pair iswell mounted inside steel cabinate and dials printed in degrees with resolutionof 20 provided to study phase displacement errors. The control knobsare factory adjusted for electrical zero and procedure is given in last page ifrecorrection required due to transportation.Complete unit is 220 volt ac mainoperable.