Changes in temperature and humidity during shipping, storage or use can affect the visual appearance, mechanical integrity, or electrical functionality of switches. This practice simulates three different environments to which membrane switches may be exposed.

The three industry-recognized switch categories based on performance levels are Level 1, Level 2, and Level 3 (see section 7.1).

Additionally, there may be custom requirements that vary by application, therefore, these requirements can be determined by customer and vendor agreement and be established as a Level 4.

This practice defines the duration of a single cycle. Multiple cycles may be appropriate depending on the requirements of the application.

1.1 This practice covers a procedure for temperature and humidity cycling of membrane switches.

1.2 This practice is designed to determine changes induced by temperature and humidity.

1.3 This practice is not intended to be a thermal shock procedure; a gradual ramp rate between conditions is required.

1.4 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.