Hitachi V-212 Operation Manual page 4

NOTE
o This instrument should be adjusted at an ambient temperature of +20°C
for best overall accuracy.
Allow at least 15 minutes warmup before proceeding,
o Polyvinyl chloride (PVC) film is attached on the enclosure and the front
panel of the oscilloscope to protect the metal surface. If the PVC film is
damaged by scratches, remove it.
o To clean the enclosure or the front panel, use neutral detergent. Refrain
from using thinner, benzine, alcohol or other chemicals.
o For safety operation, be sure to connect the ground lead of the GND
(ground) terminal to earth ground, if a two-wire AC power system is used.
Failure to complete the ground system may allow the chassis and cabinet
of this instrument to be elevated above ground potential and pose a shock
hazard.