Extech Instruments MA145 User Manual page 3

CAUTIONS
CAUTIONS identify conditions and actions that could cause DAMAGE to the meter or equipment
under test. Do not expose the meter to extremes in temperature or high humidity.
Safety Symbols that are typically marked on meters and instructions
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are
taken to limit the transient over‐voltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy‐consuming equipment to be supplied from the fixed
installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for industrial use with
permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note – Examples include electricity meters and primary over‐current protection equipment
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This symbol, adjacent to another symbol, indicates the user must refer to the
manual for further information.
Risk of electrical shock
Do not apply or remove clamp from HAZARDOUS LIVE conductors
Equipment protected by double or reinforced insulation
Battery symbol
Conforms to EU directives
Do not discard this product in household trash.
AC measurement
DC measurement
Earth ground
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