NJK1140 Heater The NJK1140 is a heater for the NJK1120A small dispenser cathode, which provides effective heating. ---- Features ---The Rhenium tungsten is easy to handle The coiled-coil design is utilized to make the radiation area wide. The Aluminum oxide is coated, and the “dark” coating treatment is applied on the surface to increase the thermal emissivity of the heater. ---- Applications ---Heater for the NJK1120A. ---- Specification ---- Item Min Max Unit Heater resistance (R) 3.8 4.1 Ω 25 ℃ Heater current (If)＊＊ 285 315 mA Tk=1050 ℃ｂ - 20 uA Ef=6.3V Ehk=+200/-200V Leak current between cathode and heater(Ihk)＊＊ Test condition Caution: The value of the Heater current (If) is measured in the case assembled with the NJK1120A, and may change depending on the complete assembled structure. Rev.1 NJK1140 OUTLINE