Rigol VS5000 Series User Manual page 6

Do not operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
The disturbance test of all the models meet the limit values of A in the
standard of EN 61326: 1997+A1+A2+A3, but can't meet the limit values
of B.
IV © 2008 RIGOL Technologies, Inc
User's Guide for VS5000 Series