Extech Instruments 450 User Manual
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Extech Instruments 450 User Manual

Extech Instruments 450 User Manual

Digital multimeter plus ir thermometer
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User's Guide
Digital Multimeter
plus IR Thermometer
Extech 450
Patented
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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Summary of Contents for Extech Instruments 450

  • Page 1 99 Washington Street User's Guide Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com Digital Multimeter plus IR Thermometer Extech 450 Patented...
  • 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.

  • 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.

  • 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. 2. If “OL” appears in the display during a measurement, the value exceeds the range you have selected.

  • 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. 2.

  • 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 Ω position. 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. 4.

  • 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. Press the MAX button to activate the MAX feature in the voltage or current functions.

  • Page 12: Specifications

    Specifications Function Range Resolution Accuracy (0.5% reading + 2 digits) DC Voltage 200mV 0.1mV 0.001V (0.8% reading + 2 digits) 0.01V 200V 0.1V (1.0% reading + 3 digits) 1000V AC Voltage 50 to 400Hz 400Hz to 1kHz (1.0% reading + 4 (2.5% reading + 8 0.001V digits)
  • Page 13 Function Range Resolution Accuracy (0.8% reading + 4 digits) Resistance 200 0.1 (0.8% reading + 2 digits) 2k 0.001k 20k 0.01k (1.0% reading + 2 digits) 200k 0.1k 2M 0.001M (3.0% reading + 5 digits) 20M 0.01M Temp -58 to 518F 1F 2.0% reading or 2C, ...

  • 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. 1.

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