Tektronix AFG3000 Series Service Manual page 38

Specifications
Pollution Degree
Installation (Overvoltage)
Category Descriptions
Overvoltage Category
1-16
Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution that
becomes conductive due to condensation. These are sheltered locations where
neither temperature nor humidity is controlled. The area is protected from
direct sunshine, rain, or direct wind.
Pollution Degree 4. Pollution that generates persistent conductivity through
conductive dust, rain, or snow. Typical outdoor locations.
Pollution Degree 2 (as defined in IEC 61010-1). Note: Rated for indoor use only.
Terminals on this product may have different installation (overvoltage) category
designations. The installation categories are:
Measurement Category IV. For measurements performed at the source of
low-voltage installation.
Measurement Category III. For measurements performed in the building
installation.
Measurement Category II. For measurements performed on circuits directly
connected to the low-voltage installation.
Measurement Category I. For measurements performed on circuits not directly
connected to MAINS.
Overvoltage Category II (as defined in IEC 61010-1)
AFG3000 Series Arbitrary/Function Generators Service Manual