MIL-STD-810F Method 507.4 - Humidity

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

1. Swelling of materials due to moisture absorption.
2. Loss of physical strength.
3. Changes in mechanical properties.
4. Degradation of electrical and thermal properties in insulating materials.
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.

The Trimble Recon is exposed to temperature and humidity levels more severe than those that occur in documented service scenarios. 10 cycles are performed - a cycle being 12 hours at 60 C (140° F) and relative humidity of 95%, and 12 hours at 30 C (86° F) with relative humidity of 85%.

The Ranger Series is tested in accordance with Procedure III - Aggravated. Procedure III exposes the test item to combined high temperature and humidity levels more severe than those that occur in documented service scenarios. 10 cycles are performed - a cycle being 12 hours at 60 C (140° F) and relative humidity of 95%, and 12 hours at 30 C (86° F) with relative humidity of 85%.

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

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