MIL-STD-810F Method 500.4
Low Pressure/Altitude

Low-pressure (altitude) chamber tests are performed to determine if the hardware can withstand and operate in a low-pressure environment and withstand rapid pressure changes. Examples of some problems that could occur as a result of exposure to reduced pressure include:

1. Rupture or explosion of sealed containers
2. Change in physical and chemical properties of low-density hardware
3. Erratic operation or malfunction of equipment resulting from arcing or corona
4. Overheating of equipment due to reduced heat transfer
5. Failure of hermetic seals

Trimble Yuma®, Nomad®, Recon® and Ranger™ are tested at 15,000 feet at 23 C (73° F). Decompression is performed at 2,000 feet per minute to 40,000 feet at -22 F (-30 C) using Method 500.4 Procedures I, II, II.