MA640-en-GB_V2.4 5/15
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Introduction
Congratulations on your purchase of this Extech MA640 True RMS Clamp Meter. This meter
measures AC/DC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Diode Test, Duty
Cycle and Continuity. Special features include Thermocouple Temperature and Non-Contact Voltage
detection. The double molded case is designed for heavy duty use. This meter is shipped fully tested
and calibrated and, with proper use, will provide years of reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer
to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous
voltages may be present
Double insulation
This
WARNING
symbol indicates a potentially hazardous situation, which if not
avoided, could result in death or serious injury.
This
CAUTION
symbol indicates a potentially hazardous situation, which if not
avoided, may result damage to the product.
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 overvoltages 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
WARNING
CAUTION
