---
kind: "section"
citation: "42 C.F.R. § 84.307"
title: "42"
number: "84.307"
heading: "Environmental treatments."
url: "https://uscodex.org/cfr/42/84.307"
---

# §84.307. Environmental treatments.

- (a) Four units submitted for approval will be tested for capacity and performance, pursuant to the requirements of [§§ 84.303 through 84.305](/cfr/42/84.303..84.305.md), after exposure to environmental treatments simulating extreme storage temperatures, shock, and vibration.
- (b) The units will be stored for 16 hours at a temperature of −45 °C and for 48 hours at a temperature of 71 °C. Units will be returned to room temperature between high and low temperature treatments. The maximum rate of change for thermal loading shall not exceed 3 °C per minute and constant temperatures shall be maintained within ±2 °C.
- (c) The units, in the casing in which they are deployed for individual use, will be subjected to physical shock according to the following procedure:
  - (1) The unit will be dropped six times from a height of 1 meter onto a concrete surface; and
  - (2) Each drop will test a different orientation of the unit, with two drops along each of its three major axes (top to bottom, left to right, and front to back).
- (d) The units will be subjected to vibration according to the following procedure:
  - (1) The unit will be firmly secured to a shaker table, which will be vibrated with motion applied along a single axis for 180 minutes;
  - (2) The unit will be vibrated one axis at a time along each of three axes for a total of 9 hours; and
  - (3) The vibration frequency regimen applied to each axis will be cyclical, repeating the sequence and specifications provided in Table 5 every 20 minutes.

## Notes

### Source

Source: 77 FR 14193, Mar. 8, 2012, unless otherwise noted.

### Authority

Authority: 29 U.S.C. 651 et seq.; 30 U.S.C. 3, 5, 7, 811, 842(h), 844.

### Source

Source: 60 FR 30355, June 8, 1995, unless otherwise noted.