Extech Instruments 450 User Manual page 2

Introduction
Congratulations on your purchase of the Extech 450 (part number
EX450) Autoranging Multimeter plus IR Thermometer. This meter
measures AC/DC Voltage, AC/DC Current, Resistance, Diode
Test, and Continuity plus Non-Contact IR Temperature. Proper use
and care of this meter will provide many years of reliable service.
Safety
WARNING
CAUTION
MAX
1000V
This symbol adjacent to another symbol,
terminal or operating device indicates that the
operator must refer to an explanation in the
Operating Instructions to avoid personal injury
or damage to the meter.
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.
This symbol advises the user that the
terminal(s) so marked must not be connected
to a circuit point at which the voltage with
respect to earth ground exceeds (in this case)
750 VAC or 1000VDC.
This symbol adjacent to one or more terminals
identifies them as being associated with
ranges that may, in normal use, be subjected
to particularly hazardous voltages. For
maximum safety, the meter and its test leads
should not be handled when these terminals
are energized.
This symbol indicates that a device is
protected throughout by double insulation or
reinforced insulation.
This symbol indicates there is a potential
hazard from a laser light source.
2 EX450V5.0V 10/06