B&K Precision 393 - Manual - Manual (Page 7)

7
Safety Symbols
Electrical Shock hazard.
Caution, refer to the operating user manual for
warning information to avoid hazard or personal
injury and prevent damage to instrument.
CATI
CATII
Category I overvoltage conditions.
Measurement instruments whose measurement
inputs are not intended to be connected to the
mains supply. The voltages in the environment
are typically derived from a limited-energy
transformer or a battery.
Category II overvoltage conditions.
Measurement instruments whose measurement
inputs are meant to be connected to the mains
supply at a standard wall outlet or similar sources.
CATIII Category III overvoltage conditions.
Measurement instruments whose measurement
inputs are meant to be connected to the mains
installation of a building.
CATIV Category IV overvoltage conditions.
Measurement instruments whose measurement
inputs are meant to be connected to the source of
power for a given building.
Environmental Conditions
The instrument may be operated in the following environment.
Operating Environment 0 °C to 40 °C
Storage Humidity
0 – 85% R.H.
Storage Environment -20 °C to +70 °C
Pollution degree Pollution degree 2
Measurement Category CAT III, CAT IV