Abstract
The total emission of the cathode of a planar diode over a range of cathode temperatures has been measured in a non-destructive way by making a detailed examination of the characteristics. A total emission of about 25 A/cm2 has been found for an EA 50 operating at normal cathode temperatures. This result has been tested by comparing theoretical values of the space-charge smoothing factor calculated from the characteristic curves in two distinct ways, only one of which involves the total emission directly. It was found that Richardson's equation for the total emission fails noticeably over the wide range of cathode temperatures investigated, and that this failure is not explicable on the basis of changes in the cathode work function.
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