MIL-K-70493 Keyboard, Data EntryThis specification establishes the requirements for manufacture and acceptance of the Data Entry Keyboard: 9355810, used in the Mortar Ballistics Computer MBC: M23. Throughout this specification this assembly is referenced as quot;keyboardquot;.

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MIL-K-70493(AR)

FIRE DATA BRT

DSP2

7 STU

Pl-A7

Pl-Al

Pl-A2

Pl-A3

Pl-A4

Pl-B4

Pl-BS Pl-BS Pl-BS Pl-BS

ON/OFF BURST

Pl-AS Pl-A6

Pl-B7

Pl-B8

3.2.l.2 Liqht emittinq diode (LEDs) illumination. The (LEDs) shall be clearly visible when observed at light levels of zero to ten foot-candles at a distance of l8 to 20 inches from the viewers

keyboard.

3.2.l.3 Electroluminescent backliqht (ELB) illumination. The ELB shall illuminate all keys so that the keys are clearly visible when observed at light levels of zero to ten foot-candles at a distance of l8 to 20 inches from the viewers eye when a 3S plus or minus l volt rms sine wave is connected to the keyboard.

3.2.2 Physical characteristics. The physical characteristics shall be as prescribed by the drawings, specifications, and QAP's.