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Appendix A: Performance Specification
A-14
1740A/1750A Series Waveform/Vector Monitor User Manual
Table A- 15: Certifications and compliances (cont.)
CATEGOR Y S TANDARDS OR DESCRIPTION
Installation
(Overvoltage)
Category
Terminals on this product may have different installation
(overvoltage) category designations. The installation categories
are:
CAT III Distribution-level mains (usually permanently
connected). Equipment at this level is typically in a fixed
industrial location.
CAT II Local-level mains (wall sockets). Equipment at this level
includes appliances, portable tools, and similar
products. Equipment is usually cord-connected.
CAT I Secondary (signal level) or battery operated circuits of
electronic equipment.
Pollution Degree A measure of the contaminates that could occur in the
environment around and within a product. Typically the internal
environment inside a product is considered to be the same as the
external. Products should be used only in the environment for
which they are rated.
Pollution Degree 1
No pollution or only dry, nonconductive pollution occurs.
Products in this category are generally encapsulated,
hermetically sealed, or located in clean rooms.
Pollution Degree 2
Normally only dry, nonconductive pollution occurs.
Occasionally a temporary conductivity that is caused by
condensation must be expected. This location is a typical
office/home environment. Temporary condensation occurs
only when the product is out of service.
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.