| 摘要 |
In apparatus for measuring the weight of a section of cigarette rod, the analogue voltage output of a rod weight sensor such as a nucleonic scanner is supplied to a voltage- to-frequency converter whose output is processed, e.g. using a microprocessor, to provide a signal representing the weight per unit length of the rod. A control system comprises a first set of lower level microprocessors (6, 8, 10, 12) each arranged to monitor a specified set of operating characteristics, including the sensor output, and to produce control signals, and an upper level microprocessor (2) arranged to coordinate and control intercommunication between the lower level microprocessors, to receive information from them and activate display means 18. The nucleonic scanner is associated with means for averaging the results of several successive scanning tests with no rod present. The average is compared with a reference to obtain an indication of source decay enabling it to be compensated. <IMAGE> |
