Chapter1 Introduction
©NationalInstruments Corporation 1-7 ATE Series User Manual
pollutiondegree stated in Appendix A,Specifications.Pollution is foreign
matter in a solid, liquid, or gaseous state that can produce a reduction of
dielectricstrength orsurface resistivity. The following is a description of
pollution degrees:
Pollution degree1 m eans no pollution or only dry,nonconductive
pollution occurs. The pollution has no influence.
Pollution degree 2 means that only nonconductive pollution occurs in
most cases. Occasionally,however, a temporary conductivity caused
bycondensation must be expected.
Pollution degree 3 means that conductive pollution occurs, or dry,
nonconductivepollution occurs, which becomes conductive due to
condensation.
Clean the product with a soft nonmetallic brush. The product must be
completely dryand free from contaminants before returning it to service.
You mustinsulate sign al connections for the maximum voltage for which
the product is rated. Do not exceed the maximum ratings for the product.
Removepower from signal lines before connection to or disconnection
from the product.
Operate this product only at or belowthe installation category stated in
Appendix A,Specifications.
The followingis a description of installat ion categories:
InstallationCategory I is for measurements performed on circuits not
directly connected to MAINS1. This categoryis a signal level such as
voltageson a printed wire board (PWB )on the second ary of an
isolation transformer.
Examples of Installation CategoryI are measurements on circuits
not derivedfrom MAINS and specially protected (internal)
MAINS-derivedcircuits.
Installation Category II is for measurements performed on circuits
directlyconnected to the low-voltage installation. This category refers
to local-leveldistribution such as that provided by a standard wall
outlet.
Examples of Installation Category II arem easurements on household
appliances, portable tools, and similar equipment.
1MAINSis defined as the electricity supply system to which the equipment concerned is designed to be connected either for
poweringthe equipment or for measurement purposes.