ASTM F2592-09

The force and displacement values when converted to a slope are useful in quantifying the differences in tactile response among membrane switches.

Specified resistance is useful to manufacturers and users when designing membrane switch interface circuitry.

Actuation force and contact force are useful to manufacturers and users in determining the suitability, reference and aesthetics of a membrane switch in a given application.

The tendency of a switch to make or break electrical contact at unexpected moments during closure or release can be a sign of a poor design. The degree of teasing can range from a simple annoyance to a failure of critical control process.

The amount of switch sensitivity or teasing can also be a result of poor surface conductivity that will prevent an electrical event even when switch poles are in partial contact.

1.1 This test method covers the measurement of force displacement characteristics of a membrane switch.

1.1.1 This test method replaces Test Method F 1570 (Tactile Ratio). Tactile Response Slope better represents the characterization of tactile sensation, previously called “Tactile Ratio” in Test Method F 1570.

1.1.2 This test method replaces Test Method F 1682 (Travel).

1.1.3 This test method replaces Test Method F 1597 (Actuation and Contact Force).

1.1.4 This test method replaces Test Method F 1997 (Switch Sensitivity).

1.2 Force displacement hysterisis loop curve can be used in the determination of Actuation Force, Displacement, Contact Force, Return Force, and Tactile Response Slope.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.