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Summary of Contents for Netzerotools Extech 450
- Page 1 Extech EX450 Professional Multimeter User's Guide Extech EX450-NIST Professional MultiMeter Digital Multimeter plus IR Thermometer Extech 450 Patented netzerotools.com...
- 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, Capacitance, Frequency, Duty Cycle, Diode Test, and Continuity plus Non- Contact IR Temperature. Proper use and care of this meter will provide many years of reliable service.
- Page 3 CAUTIONS Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter. Always remove the test leads before replacing the battery or fuses. Inspect the condition of the test leads and the meter itself for any damage before operating the meter.
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Page 4: Overvoltage Category
OVERVOLTAGE CATEGORY III This meter meets the IEC 610-1-2001 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. - Page 5 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.
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Page 6: Dc Voltage Measurements
Operating Instructions WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care. 1. ALWAYS turn the function switch to the OFF position when the meter is not in use. -
Page 7: Ac Voltage Measurements
AC VOLTAGE MEASUREMENTS WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts inside some 240V outlets for appliances because the contacts are recessed deep in the outlets. As a result, the reading may show 0 volts when the outlet actually has voltage on it. -
Page 8: Ac Current Measurements
AC CURRENT MEASUREMENTS CAUTION: Do not make current measurements on the 20A scale for longer than 30 seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads. 1. Insert the black test lead banana plug into the negative COM jack. -
Page 9: Continuity Check
CONTINUITY CHECK WARNING: To avoid electric shock, never measure continuity on circuits or wires that have voltage on them. 1. Set the function switch to the green position. Ω 2. Insert the black lead banana plug into the negative COM jack. -
Page 10: Non-Contact Temperature Measurements
NON-CONTACT TEMPERATURE MEASUREMENTS 1. Set the function switch to the red IR Non-Contact ºC or ºF position. 2. Point the meter at the surface to be measured. 3. If needed, press the red IR Laser Pointer button to locate the exact spot being measured. -
Page 11: Display Backlight
DISPLAY BACKLIGHT Press and hold the HOLD key for >1 second to turn on or off the display backlight function. Note: The HOLD feature will activate when the Backlight is turned on. Press the HOLD key again to exit Hold. -
Page 12: Specifications
Specifications Function Range Resolution Accuracy DC Voltage 200mV 0.1mV (0.5% reading + 2 digits) 0.001V 0.01V (0.8% reading + 2 digits) 200V 0.1V 1000V (1.0% reading + 3 digits) AC Voltage 50 to 400Hz 400Hz to 1kHz 0.001V (1.0% reading + 4 (2.5% reading + 8... - Page 13 Function Range Resolution Accuracy Resistance 200 0.1 (0.8% reading + 4 digits) 2k 0.001k (0.8% reading + 2 digits) 20k 0.01k 200k 0.1k (1.0% reading + 2 digits) 2M 0.001M 20M 0.01M (3.0% reading + 5 digits) Temp -58 to 518F 1F...
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Page 14: Maintenance
Maintenance WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input terminals, and turn OFF the meter before opening the case. Do not operate the meter with an open case. This MultiMeter is designed to provide years of dependable service, if the following care instructions are performed: 1. -
Page 15: Replacing The Fuses
REPLACING THE FUSES WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input terminals, and turn OFF the meter before opening the case. Do not operate the meter with an open case.
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