MIL-DTL-62366D(AT)
3.4.6.2 Control rings. The control rings shall function with maximum input voltage for
fault free, battery only conditions and single fault conditions as specified in MIL-STD-1275.
The control rings shall be capable of transmitting Transistor-Transistor Logic (TTL) levels of
0.0±0.5 volts (V) direct current (dc) through 2.5±0.5 Vdc. The steady state voltage shall not
exceed 33 V. Class I and class II control rings shall be as specified below (see 4.3.5.5.2
and 4.3.5.5.2.1).
Class I -
Class I control rings shall be designated as numbers 3 through 17. Class I
control rings shall transmit a continuous current of 7 A, with surges of 10 A
allowed for not greater than 40 seconds, surges of 50 A allowed for not
greater than 3 seconds, and surges of 100 A allowed for not greater than 0.8
seconds.
Class II - Class II control rings shall be designated as numbers 1 through 32. Control
rings numbered 1 through 6 and 8 through 12 shall provide discrete control
and transmit current as specified in 3.4.6.2.a. Control rings, numbered 14
through 19, 21 through 26, and 28 through 31, shall be capable of digital data
transmission and shall transmit current at frequencies between 100 kilohertz
(kHz) and 1 megahertz (MHz).
3.4.6.2.1 Capacitance. The capacitance of each control circuit, between each conductor
and its shield, with the shield and the slip ring assembly housing connected to ground, shall not
exceed 600 picofarads (pF) (see 4.3.5.5.2.2).
3.4.6.2.2 Noise. Measured across any two ring leads with all brush leads shorted
together, control ring noise level shall not exceed 400 microvolts (V) peak-to-peak
(see 4.3.5.5.2.3).
3.4.6.3 Common requirements for power and control rings.
3.4.6.3.1 Dielectric withstanding voltage. The slip ring assembly shall be capable of
withstanding 500 volts root mean square (V rms), 60 hertz (Hz), for 15 seconds between
mutually insulated points without sustaining damage or degrading performance (see 4.3.5.5.3.1).
3.4.6.3.2 Insulation resistance. The insulation resistance between each two circuits and
between each circuit and the case shall be not less than 100 megaohms (M) at 100 Vdc at 50 to
60% relative humidity (see 4.3.5.5.3.2).
3.4.6.3.3 Resistance. The pin-to-pin resistance at 77 degrees Fahrenheit (°F) (25 degrees
Celsius (°C)) through each ring shall be as specified tables IV and V (see 4.3.5.5.3.3).
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