MIL-S-22885/100A
RFI shielding: When specified (See table V), switches shall be equipped with an RFI screen. Resistance between the mounting sleeve and the RFI screen shall be measured in accordance with method 307 of MIL-STD-202 and shall not exceed 1 ohm. The following details and exceptions shall apply:
a. Method of connection: 8etween a suitable exterior point on the mounting surface and the screen
(lens may be drilled for access to screen)
b. Test current: 100 ± 10 milliampers. c. Open circuit test voltage: 6 ± 1 V dc.
d. Number of measurements per activation: One in free position and one in full plunger overtravel
position. There shall be no exterior force applied to plunger during measurement of resistance in free position.
e. Number of test activations: One complete cycle of operation with full overtravel.
Sunlight Readability: When specified, the average contrast ratio of each lighted legend character to background shall be 0.6 minimum. The contrast ratio of each unlighted character shall be less than 0.1.
The average contrast ratio of each legend character to the background shall be measured with an incidental illumination of 10,000 foot-candles minimum, at 5,000 ± 500° Kelvin color temperature, directed at an angle of 45° ± 2° to the normal of the viewing surface. Luminance readings shall be point readings taken by a calibrated photoelectric photometer. At least 3 readings shall be taken at equally spaced points on each legend character. The readings shall be averaged provided that the ratio of high-to-low readings shall not exceed 2:1. At least 3 readings shall then be taken at equidistant points in the background immediately adjacent to each character. The background readings shall also be averaged. The contrast ratios, CL and CUL, shall be calculated for each character.
The ON/8ACKGROUND contrast is defined by CL = (82-81)/81
The OFF/8ACKGROUND contrast is defined by CUL = (83-81)/81
81 = Average background luminance
82 = Average character luminance, legend illuminated
83 = Average character luminance, legend not illuminated
Unless otherwise specified, switch lamps used for testing shall have a calibrated mean spherical candlepower of .15 ± .01. Unless otherwise specified, the following test legend shall be utilized:
REMOTE ALT LOW
TA8LE I. Electrical ratings - silver contacts.
Load |
Sea Level, 28 V dc |
80,000 Feet, 28 V dc |
NO or NC |
NO or NC |
|
Resistive Inductive Lamp |
(Amperes, max.) 7.5 5.0 1.0 |
(Amperes, max.) 7.5 3.0 --- |
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