MIL-STD-810F Method 507.4
Humidity

Moisture can cause physical and chemical deterioration of hardware to include corrosion and biologic growth; changes in hardware properties due to moisture penetration, and electrical or mechanical performance issues due to condensation. Typical problems that can result from exposure to a warm, humid environment include:

1. Swelling of hardware due to moisture absorption
2. Loss of physical strength
3. Changes in mechanical properties
4. Degradation of electrical and thermal properties in insulating hardware
5. Electrical shorts due to condensation
6. Binding of moving parts due to corrosion or fouling of lubricants
7. Oxidation and/or galvanic corrosion of metals
8. Loss of plasticity
9. Accelerated chemical reactions

Trimble Recon® and Ranger™ passed the following test:

• Procedure III-Aggravated: humidity tested using a humidity chamber set at 140 °F (60 °C) and relative humidity of 95% for 12 hours then transitioning to 86 °F (30 °C) with relative humidity of 85% for 12 hours. A total of ten cycles are conducted to complete the test.

Trimble Nomad® tested at 90% relative humidity through 10 temperature cycles at -4 °F (-20 °C) and 140 °F (60 °C).

Trimble Yuma® tested at 90% relative humidity through 10 temperature cycles at 32 °F (0 °C) and 158 °F (70 °C).