User's Guide
Autoranging Multimeter
plus IR Thermometer
Extech 450
Patent Pending
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
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.
WARNING
CAUTION
MAX
1000V
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.
EX450V5.0V 10/06 2
OVERVOLTAGE CATEGORY III
This meter meets the IEC 610-1-95 standard for OVERVOLTAGE
CATEGORY III. Cat III meters are protected against overvoltage
transients in fixed installation at the distribution level. Examples
include switches in the fixed installation and some equipment for
industrial use with permanent connection to the fixed installation.
SAFETY INSTRUCTIONS
This meter has been designed for safe use, but must be operated
with caution. The rules listed below must be carefully followed for
safe operation.
1. NEVER apply voltage or current to the meter that exceeds the
specified maximum:
V DC or V AC 1000V DC/750V AC, 200Vrms on
Function Maximum Input
mA AC/DC 200mA 250V fast acting fuse
A AC/DC 20A 250V fast acting fuse(30
Resistance, Diode Test,
Continuity
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input
jack exceeds 1000V above earth ground.
4. NEVER connect the meter leads across a voltage source
while the function switch is in the current, resistance, or diode
mode. Doing so can damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and
disconnect the power when making resistance or diode tests.
6. ALWAYS turn off the power and disconnect the test leads
before opening the cover to replace the fuse or battery.
7. NEVER operate the meter unless the back cover and the
battery and fuse covers are in place and fastened securely.
8. NEVER look directly at the laser light source or aim the
pointer at an eye.
Input Protection Limits
200mV range
seconds max every 15 minutes)
250Vrms for 15sec max
EX450V5.0V 10/06 3
Controls and Jacks
1. IR Thermometer and laser pointer
2. 2000 count LCD display
3. HOLD button
4. SELECT button
5. Function switch
6. mA, uA and A input jacks
7. COM input jack
8. Positive input jack
9. MAX hold button (voltage and current)
10. BACKLIGHT button
11. Laser pointer button
12. Protective holster
Note: Tilt stand and battery compartment are on rear of unit.
Symbols and Annunciators
•))) Continuity
Diode test
Laser pointer
Battery status
Test lead connection
error
µ micro (10
m milli (10
k kilo (10
M mega (10
MAX Maximum hold V Volts
AUTO Autoranging DC Direct current
HOLD Display hold ºF Degrees Fahrenheit
ºC Degrees Centigrade
-6
) (amps)
-3
) (volts, amps) A Amps
3
) (ohms) F Farads (capacitance)
6
) (ohms) Ω Ohms
EX450V5.0V 10/06 4
Specifications
Function Range Resolution Accuracy
DC
Voltage
AC
Voltage
DC
Current
AC
Current
NOTE: Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less
200mV 0.1mV
2V 0.001V
20V 0.01V
200V 0.1V
1000V 1V
50 to 400Hz 400Hz to 1kHz
2V 0.001V
20V 0.01V
200V 0.1V
750V 1V
200µA 0.1µA
2000µA 1µA
20mA 0.01mA
200mA 0.1mA
2A 0.001A
20A 0.01A
50 to 400Hz 400Hz to 1KHz
200µA 0.1µA
2000µA 1µA
20mA 0.01mA
200mA 0.1mA
2A 0.001A
20A 0.01A
than 75% RH.
±(0.5% reading + 2 digits)
±(0.8% reading + 2 digits)
±(1.0% reading + 3 digits)
±(1.0% reading
+ 4 digits)
±(1.5% reading
+ 4 digits)
±(2.0% reading
+ 6 digits)
±(1.5% reading + 3 digits)
±(2.5% reading + 5 digits)
±(1.8% reading
+ 8 digits)
±(3.0% reading
+ 8 digits)
±(2.5% reading
+ 8 digits)
±(3.0% reading
+ 8 digits)
±(3.5% reading
+ 8 digits)
±(3.0% reading
+ 7 digits)
±(3.5% reading
+ 10 digits)
EX450V5.0V 10/06 5
Function Range Resolution Accuracy
Resistance
Temp
(IR)
NOTE: Accuracy specifications consist of two elements:
• (% reading) – This is the accuracy of the measurement circuit.
• (+ digits) – This is the accuracy of the analog to digital converter.
200Ω 0.1Ω ±(0.8% reading + 4 digits)
2kΩ 0.001kΩ ±(0.8% reading + 2 digits)
20kΩ 0.01kΩ
200kΩ 0.1kΩ
2MΩ 0.001MΩ
20MΩ 0.01MΩ ±(3.0% reading + 5 digits)
-58 to 518°F 1°F
-50 to270°C 1°C
±(1.0% reading + 2 digits)
±2.0% reading or ±2°C, ± 4 °F
Diode Test Test current of 0.3mA maximum,
Continuity Check Audible signal will sound if the
IR Spectral response 6 to 16µm
IR Emissivity 0.95 fixed
IR distance ratio 8:1
Input Impedance >7.5MΩ (VDC & VAC)
AC Response Average responding
ACV Bandwidth 50Hz to 1kHz
Display 2000 count backlit liquid crystal
Overrange indication “OL” is displayed
Auto Power Off 15 minutes (approximately)
Polarity Automatic (no indication for
Measurement Rate 2 times per second, nominal
Low Battery Indication “ ” is displayed if battery voltage
open circuit voltage 1.5V DC typical
resistance is less than 150Ω
(approx.), test current <0.7mA
positive); Minus (-) sign for negative
drops below operating voltage
EX450V5.0V 10/06 6
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