RIGOL 
MSO4000/DS4000 User’s Guide  III 
Do Not Insert Anything Into the Holes of Fan. 
Do not insert anything into the holes of the fan to avoid damaging the instrument. 
 
Use Proper Fuse.
 
Please use the specified fuses. 
 
Avoid Circuit or Wire Exposure. 
Do not touch exposed junctions and components when the unit is powered. 
 
Do Not Operate With Suspected Failures. 
If you suspect damage occurs to the instrument, have it inspected by RIGOL 
authorized personnel before further operations. Any maintenance, adjustment or 
replacement especially to circuits or accessories must be performed by RIGOL 
authorized personnel. 
 
Keep Well Ventilation. 
Inadequate ventilation may cause an increase of instrument temperature which 
would cause damage to the instrument. So please keep the instrument well 
ventilated and inspect the intake and fan regularly. 
 
Do Not Operate in Wet Conditions. 
In order to avoid short circuiting to the interior of the device or electric shock, please 
do not operate the instrument in a humid environment. 
 
Do Not Operate in an Explosive Atmosphere. 
In order to avoid damage to the device or personal injuries, it is important to operate 
the device away from an explosive atmosphere. 
 
Keep Product Surfaces Clean and Dry. 
To avoid the influence of dust and/or moisture in the air, please keep the surface of 
the device clean and dry. 
 
Electrostatic Prevention. 
Operate the instrument in an electrostatic discharge protective environment to avoid 
damage induced by static discharges. Always ground both the internal and external 
conductors of cables to release static before making connections. 
 
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