RIGOL 
MSO1000Z/DS1000Z User’s Guide    XI 
Pollution degree 2: Normally only dry, non-conductive pollution occurs. Occasionally 
a temporary conductivity caused by condensation may occur. For example, general 
indoor environment. 
Pollution degree 3: Conductive pollution occurs, or dry, non-conductive pollution 
occurs which becomes conductive due to condensation which is expected. For 
example, sheltered outdoor environment. 
Pollution degree 4: Pollution that generates persistent conductivity through 
conductive dust, rain, or snow. For example, outdoor locations. 
 
Safety Class 
Class 1 – Grounded Product