An automatically controlled apparatus of target chamber was made to measure spectra of the excited atoms and lifetime of the excited levels. The hardware is composed of nine parts including a computer and a step-motor
while the software consists of three branch programs. The maximum movable distance of target position is 65cm with a step-length of 8.3 u m and a precision of ±18 u m per 2mm. On account of simple structure and double
protection
the apparatus exhibits flexibility and reliability in years service.