Rigol DS1000CA Series Quick Manual page 6

RIGOL
Keep Product Surfaces Clean and Dry.
To avoid the influence of dust and/or moisture in the air on the
performance of the instrument, please keep the surface of the
instrument clean and dry.
The disturbance tests of all the models conform to class A
standard on the basis of EN 61326: 1997+A1+A2+A3, but
do not conform to class B standard.
Measurement Category
The DS1000CA series Digital Oscilloscope can make measurements
in Measurement Category I.
Measurement Category Definitions
Measurement Category I is for measurements performed on circuits
not directly connected to MAINS. Examples are measurements on
circuits not derived from MAINS, and specially protected (internal)
MAINS derived circuits. In the latter case, transient stresses are
variable; for that reason, the transient withstand capability of the
equipment is made known to the user.
WARNING
IEC Measurement Category. The HI and LO input terminals can be
connected to circuit terminals with up to 300 VAC line voltage under
IEC Category I installation conditions. To avoid the danger of
electric shock, do not connect the input terminals to circuits with
greater than 300Vrms line voltage.
Transient overvoltage is also present in circuits that are isolated
from mains. The DS1000CA series Digital Oscilloscopes can safely
withstand up to 500Vpk transient overvoltage. Do not use this
iv Quick Guide for DS1000CA