Extech Instruments 411 User Manual
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Extech Instruments 411 User Manual

Extech Instruments 411 User Manual

True rms multimeter
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User's Guide
True RMS Multimeter
Extech 411

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Summary of Contents for Extech Instruments 411

  • Page 1 User's Guide True RMS Multimeter Extech 411...

  • Page 2: International Safety Symbols

    Introduction Congratulations on your purchase of the Extech 411 (part number EX411) True RMS Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Diode Test, and Continuity plus Thermocouple 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

    Controls and Jacks 1. Rubber holster 2. 2000 count LCD display 3. °F button 4. °C button 5. Function switch 6. mA, uA and A input jacks 7. COM input jack 8. Positive input jack 9. Battery check button 10. Hold button 11.

  • 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 “1 ” 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. Make sure the probe tips are touching the metal contacts inside the outlet before assuming that no voltage is present.

  • 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 position. 2. Insert the black lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive  jack. 3.

  • Page 10: Temperature Measurements

    TEMPERATURE MEASUREMENTS 1. Set the function switch to the TEMP position. 2. Insert the Temperature Probe into the Temperature Socket, making sure to observe the correct polarity. 3. Press the ºC or ºF button for the desired units. 4. Touch the Temperature Probe head to the part whose temperature you wish to measure.

  • Page 11: Specifications

    Specifications Resolution Function Range Accuracy (0.3% reading + 2 digits) DC Voltage 200mV 0.1mV (V DC) 0.001V (0.5% reading + 2 digits) 200V 0.1V 1000V (0.8% reading + 2 digits) AC Voltage 50 to 400Hz 400Hz to 1kHz (V AC) 0.001V (1.0% reading +6 (2.0% reading + 8 digits...
  • Page 12 General Specifications Diode Test Test current of 1mA maximum, open circuit voltage 2.8V DC typical Continuity Check Audible signal will sound if the resistance is less than approximately 150 Input Impedance 10MΩ AC Response True rms ACV Bandwidth 50Hz to 1kHz DCA voltage drop 200mV Display...

  • Page 13: 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 14: 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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