INTRODUCTION

Intent¹ The intent of this test is to provide a means of evaluating the effects of low barometric pressure (high altitude) on fiber optic components. Although intended primarily for the evaluation of devices such as interconnecting devices, the method may be applied to other components when applicable and when required by a Detail Specification.

Alternative Method. This test is similar to that prescribed by FOTP-15, except that specimens tested under FOTP-15 are immersed in water during low pressure exposure in order to simulate the effects of moisture condensation which accompany rapid descents from high altitude. Also, FOTP-190 provides a wider choice of test pressures than does FOTP-15.

Failure Modes. The potential failure modes for this test include, but are not limited to:

a. Unacceptable changes in optical transmittance,

b. Unacceptable changes in insertion loss,

c. Unacceptable changes in return loss,

d. Damage to device seals,

e. Other failure modes (such as changes in engagement and separation forces) may be specified by the Details Specification.

¹ This method is similar to Method 105c of MIL-STD-202.