User Manual Part 1

4 Draft: 8/13 PTM 1000 Operations and Maintenance Manual
Moisture-Sensitive Device (MSD) Warnings
Some units and/or assemblies are shipped in vacuum-sealed
packages to protect moisture-sensitive devices (MSDs). An
MSD is a component in which moisture can accumulate and
cause damage when the component is not powered or is not in
use. After an MSD unit or assembly is removed from its
vacuum-sealed package, the MSD must be kept in a dry place
not susceptible to moisture.