9 Characteristics and Specifications  
Agilent U1602B/U1604B User’s and Service Guide  183
Environmental Conditions
Pollution Degree
The product may be operated in environments of Pollution Degree 2.
Pollution Degree Definitions
Pollution Degree 1: No pollution or only dry, non- conductive pollution 
occurs. The pollution has no influence. Example is a clean room or 
climate controlled office environment.
Pollution Degree 2: Normally only dry non- conductive pollution occurs. 
Occasionally a temporary conductivity caused by condensation may occur. 
Example is general indoor environment.
Pollution Degree 3: Conductive pollution occurs, or dry, non- conductive 
pollution occurs which becomes conductive due to condensation which is 
expected. Example is sheltered outdoor environment.