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MIL-PRF-22710 Switches, Code Indicating Wheel \(Printed Circuit\), Thumbwheel And Push-Button, General Specification ForThis specification covers the general requirements for illuminated and non-illuminated, thumbwheel \(see 6.4.1\), and push-button, printed circuit rotary switches having unsealed and sealed modules and the associated hardware. These switches are designed for low power alternating current \(ac\) and direct current \(dc\) switching applications for use in electronic and communication equipment. Procurement of switches and mounting hardware will require additional data, giving detailed electrical and mechanical requirements, tolerances, and applicable additions and exceptions to the general requirements and tests specified herein \(see 6.2\).

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MIL-PRF-22710H

TABLE VI. Qualification inspection.

Inspection

Requirement paragraph

Method paragraph

Group I (all sample units - 18 total)

Visual and mechanical inspection

3.1, 3.3, 3.4,

4.5.1

(2 sample units for interface and dimensions)

3.28, and 3.30

Contact resistance

3.5

4.5.2

Circuit configuration

3.6

4.5.3

Luminance (when applicable)

3.7

4.5.4.2

Indicator ring (when applicable)

Color

Rotational torque or operating force (as applicable)

3.8

4.5.5

Stops (when applicable)

3.9

4.5.6

Group II (4 sample units)

Thermal shock

3.10

4.5.7

Terminal strength (when applicable)

3.11

4.5.8

Strength of mounting bushing (when applicable)

Vibration

Shock

Rotational torque or operating force (as applicable)

3.8

4.5.5

Insulation resistance

Contact resistance

Lamp retention (when applicable)

3.16

4.5.13

Seal (when applicable)

3.17

4.5.14

Dielectric withstanding voltage

3.18

4.5.15

Group III (2 sample units)

Moisture resistance (includes insulation resistance)

3.19

4.5.16

Dielectric withstanding voltage

3.18

4.5.15

Rotational torque or operating force (as applicable)

Contact resistance

EMI/RFI shielding (when specified)

3.20

4.5.17.1,4.5.17.2

Group IV (4 sample units)

Acceleration (when applicable)

3.21

4.5.18

Sand and dust (when applicable)

3.22

4.5.19

Insulation resistance

3.15

4.5.12

Explosion (when applicable)

3.23

4.5.20

Salt spray (corrosion)

Contact resistance

Rotational torque or operating force (as applicable)

3.8

4.5.5

Seal (when applicable)

3.17

4.5.14

Dielectric withstanding voltage 1/

3.18

4.5.15

Group V (6 sample units)

Life (rotational) 2/

3.25

4.5.22

At rated ac load (resistive) 2 sample units 3/

At rated dc load (resistive) 2 sample units 3/

Life, low level switching, 2 sample units

3.26

4.5.23

Rotational torque or operating force (as applicable)

Contact resistance

Seal (when applicable)

3.17

4.5.14

Insulation resistance

3.15

4.5.12

Dielectric withstanding voltage

3.18

4.5.15

Group VI (2 sample units) 4/

Solderability

3.27

4.5.24

Only when seal is applicable.

One additional sample unit to be tested to all other loads specified.

Two additional sample units are applicable when barometric pressure is reduced (see 4.5.22.2).

Additional samples of the printed circuit board may be submitted for the solderability test.