MIL-DTL-13735G
TABLE III. Zero defect sampling plan.
Minimum number of
Lot size
switches to be tested
All
1 - 12
13
13 - 150
20
151 - 280
29
281 - 500
34
501 - 1,200
42
1,201 - 3,200
50
3,201 - 10,000
60
10,001 - 35,000
TABLE IV. Group B.
Description
Requirement
Test
Contact voltage drop
Withstanding force
Average operating force
Overload
Contact voltage drop
Waterproofness (grade 1 only)
Terminal strength
High voltage
Contact voltage drop
4.8.6 Withstanding force. To determine conformance to 3.4.2.1, the switch shall be mounted as in intended
operation, to a suitable plate. With the lever in one extreme position, the specified withstanding force shall be applied
to the lever in the direction opposite to the direction of travel of the lever for 30 ± 1 seconds. This shall be repeated
four times. With the lever in the other extreme position, the same force shall be applied in the same manner, the
same number of times.
4.8.6.1 Connector or terminal strength. To determine conformance to 3.4.2.1.1, the switch shall be mounted as in
intended operation, by means of a suitable mounting plate or fixture. If the switch has connectors conforming to
MS33800, or other male-female connectors directly attached to the switch body, the force specified in 3.4.2.1.1 shall
be applied to each mating connector cable in a direction perpendicular to the connector pin. If the switch has leads,
the force shall be applied to each lead in the direction of each major axis of the switch so that it will be transmitted to
the body of the switch.
4.8.7 Average operating force. To determine conformance to 3.4.2.2, an average operating force shall be defined
as the sum of all the forces required to move the switch lever between any two given adjacent lever positions during
the test specified in 4.8 7.1 and 4.8.7.2 divided by the number of times the lever is moved between these same
adjacent positions by a force during the same test.
4.8.7.1 Switches without a center position. The switch shall be mounted, in operational condition, to a suitable
mounting plate or fixture. With the switch lever initially in a maintained contact position, a gradually increasing force
shall be applied to the switch lever in the direction of lever travel, until the lever is in the opposite position. If the
switch is class B, a gradually increasing force shall then be applied in the opposite direction until the lever is in the
original position. If the switch is class A, the lever shall then be released and the release time measured. The same
process shall be repeated four times. The average operating force and the average of the release times shall be
computed.
4.8.7.2 Switches with a center position. With the switch lever initially in center position, the procedure specified in
4.8.7.1 shall be followed treating the center position and one extreme position as an individual switch. The same
procedure shall also be followed, treating the center position and the other extreme position as an individual switch.
The average operating forces (see 4.8.7) and the average of the release times shall be computed.
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