F.E.T. Transistor Tester 185

F.E.T. Transistor Tester

One of the instruments in a new range of test equipment being shown by Comark was a f.e.t. transistor tester, type 185. This is believed to be the first service instrument of its kind for measuring the static and dynamic characteristics of f.e.ts and m.o.s.ts.
It will measure drain current from 1 uA to 30 mA in 10 ranges for varying gate and drain voltages, and it indicates the pinch-off voltage for any drain voltage in the pinch-off range.
Mutual conductance can be measured in 8 ranges from 10 uA/V to 30 mA/V f.s.d., the driving signal being a 500 Hz squaré wave at 100 mV p-p. The polarities of the drain and gate supplies are separately reversible so that both enhancement and depletion f.e.t. and m.o.s.t. of n-channel and p-channel may be tested.

Overload protection is incorporated.
Three PP4-type batteries provide the drain supply at 2.7mA plus f.e.t. current, and three Mallory TM115s supply the gate current.

Vous pourrez trouver sous ce lien 5 modèles d'appareils, 5 avec des images et 2 avec des schémas.
Tous les appareils de Comark Electronics Ltd.; Littlehampton