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Page Title:
Input/Output Signal Characteristics |
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|  MIL-D-81347C(AS)
3. A change in the digital signal shall produce a cor-
responding change in the analog signal within one LSB.
4 . The magnitude accuracy of X relative to Y shall be
less than +2%.
--
5 . The absolute accuracy of X or Y shall be less
than +4%.
(2) "Z" Axis Video - Positive going video signals shall be DC
coupled to the video amplifier of the Pilot Display for intensity modulation of the CRT. Video ampli-
tude shall be proportional to writing speed.
(3) Unblank - The PDL shall provide a positive going voltage
level to the Pilot Display for unblinking the CRT. The unblank signal shall have the same duration as
the video signal, but shall have constant amplitude.
3.5..3 .4.2.4.1.2.3
Pilot Display Logic to Master Timing Logic - The PDL shall
transmit diagnostic data to the MTL when required.
3.5.3 .4.2.4.2
Input/Output Signal Characteristics
3.5.3.4.2.4.2.1
Maintenance Control Panel and Master Timing - All internal sig-
nals between the PDL and the MCP and MTL shall be transmitted over single ended lines whose logical
"0" = 0. 0 + 0.5, -0.0 volts and logical "1" = +5.0 +1.5 volts. -
3.5.3.4.2.4.2.2
Pilot Display - The PDL input/output signals to and from the
Pilot's Display shall be as follows:
3.5.3.4.2.4:2.2.1
Triaxial Transmissions - All signals to the Pilot Display shall
be transmitted via Amphenol 421-033 cable or equivalent terminated in a differential amplifier whose
input impedance shall be 90 to 95 ohms and 100 pf maximum. The coaxial cable shall not exceed 100
feet.
(1) X and Y Deflection Signals - The X and Y deflection signal
characteristics shall be as described in 3.5.3.4.2.4.1.2.2(1). Transition times for gross positioning
signals shall be less than 4.0 microseconds.
(2) "Z" Axis Video - This signal shall be positive going from 0 to
between 2.0 to 2.5 volts peak. The video signal shall provide the following voltage levels in order to
obtain uniform brightness on the CRT for conic and character generation.
(a) Conic
Video voltage +5%
% Maximum radius displayed
50% X Maximum voltage
O - 25%
65% X Maximum voltage
26- 50%
80% X Maximum voltage
51- 75%
Maximum voltage
76- 100%
(b) Character
Character Video Voltage = 50%x Max. Voltage 5%.
(3) Unblank - This signal shall be +5. 0 1.5 volts with a rise
time and fall time not to exceed 100 nanoseconds when measured at the 10% and 90% amplitude points.
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