Abstract
A microcomputerized measurement system is developed. This system automatically acquires anI–V characteristic curve in 5 seconds with the accuracy of 0.05% FSR (full scale range). The Schottky extrapolation field-free emission, the inflection point emission, the flection-point emission, the average effective work function, the Richardson work function, the work function distribution at the operation temperature and other important information that reflects properties of cathodes are obtained by this system. The results of analysing four types of cathodes demonstrate that this system is very suitable for measuring the activity changes of the cathode in the processes of activation, ageing, poisoning and life test. It is proved that this system can also be used to monitor the activity of the cathode in the assembled tube by measuring a grid controlled travelling-wave tube.
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