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|  MIL-N-81497A(AS)
3.4.3 .2.3 (Continued)
Resolution - The altimeter output is defined
(3)
by altitude in 100 foot increments in 10 bit,
11 lead outputs (one common). Seven bits
(D4, A1, A2, A4, B1, B2, B4) in a reflected
Gray code are used to encode 500 foot increments
from -1000 to +38,000 feet, the additional
bits (C1, C2, C4) provide in conjunction
with the 500 foot increments the encoding of
100 foot increments. The code represents the
transition through zero feet altitude in the
following manner:
Altimeter Code Designation
Current Limitations - The maximum current
(4)
drawn shall be 3.5 milliamperes (MA)\bit.
Voltage - The signal voltage placed on the
(5)
altimeter is -15V applied to the common
altimeter output lead. This signal shall be
supplied by the equipment specified herein.
Altimeter Characteristics - The altimeter load
(6)
equivalent circuit shall consist of the series
circuit of a blocking diode (1V drop), 1000
ohm resistor plus encoder switch.
Input\Output Circuit Characteristics - In
(7)
accordance with Figure 5.
Altimeter Operate Switch Discrete -
(8).
(a) Logic:
(i) Continuity (altimeter operative)
(ii) Open Circuitry (inoperative)
(b) Signal Characteristics:, See 3.4.3.2.3(4).
through 3.4.3.2.3(7).
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