MIL-DTL-15291G
TABLE V. Sampling.
Minimum number of
Lot size
switches to be tested
1
to
50
All
51
to
90
All
91
to
150
90
151
to
280
125
281
to
500
125
501
to
1,200
125
1,201
to
3,200
125
3,201
to
10,000
192
10,001
to
35,000
294
35,001
to
150,000
294
TABLE VI. Group B inspection.
Inspection
Requirement
Test method
Stop strength
Dielectric withstanding voltage
Contact resistance
Temperature rise
Endurance, ac
Insulation resistance
4.6 General examination. Switches shall be examined to verify that the materials, design, construction,
physical dimensions, and marking are in accordance with this specification
4.7 Test procedures.
4.7.1 Operation. The operation test shall consist of the minimum number of electrical operations to
ascertain that the switching action is in accordance with 3.6.1. The switch shall be energized at any
convenient voltage and current within the switch rating. A suitable audible or visual device shall be used
to indicate the opening and closing of the circuits at each position and/or each deck for multideck
switches. Suitable measuring devices shall be used to determine whether transfer action is as specified.
4.7.1.1 Momentary position return. The switch shall be mounted by its normal mounting means. The
switch operating shaft shall be rotated 75 ± 5 degrees from an adjacent rest position toward a momentary
position and released. This test shall be made for each momentary position of the switch blades.
Normally closed circuits shall be tested for continuity and handle shaft displacement and float shall be
measured.
4.7.1.2 Stop strength. The switch shall be mounted by its normal mounting means. The switch shaft
shall be rotated to the clockwise and counterclockwise extremes and a torque in accordance with table
VII shall be applied to the switch shaft and maintained for 10 seconds. Switch contacts shall be
monitored for open or closed conditions in the stop positions.
4.7.1.3 Transfer time (see 3.6.1.3). The time between the opening of an initially closed contact and the
closing of the initially open contact shall be measured using an oscilloscope capable of measuring to 500
microseconds. The contacts being used for measurement shall be of the break before make style and
shall be 90 degrees a part. Three clockwise measurements and three counterclockwise measurements
shall be taken and the average transfer time shall comply with 3.6.1.3.
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