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Extech Instruments EX420A User Manual

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USER MANUAL
Digital Multimeter
Extech EX420A

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Summary of Contents for Extech Instruments EX420A

  • Page 1 USER MANUAL Digital Multimeter Extech EX420A...

  • Page 2: International Safety Symbols

    Introduction Congratulations on your purchase of the Extech EX420A Autoranging Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency, Duty Cycle, Diode Test, and Continuity plus Thermocouple Temperature. Proper use and care of this meter will provide many years of reliable service. For copies of this user manual in other languages please visit the www.extech.com...
  • Page 3 11. In case the device is going to be unused for an extended period of time, remove the batteries to prevent them from draining. 12. Expired or damaged batteries can cause cauterization on contact with skin. Always use suitable hand protection. 13. See that the batteries are not short-circuited. Do not put batteries into fire. EX420A-en-GB_v4.0 6/16...

  • Page 4: Overvoltage Category

    ALWAYS turn off the power and disconnect the test leads before opening the covers to replace the fuse or battery. NEVER operate the meter unless the back cover and the battery and fuse covers are in place and fastened securely. EX420A-en-GB_v4.0 6/16...

  • Page 5: Symbols And Annunciators

    ) (volts, amps) Amps kilo (10 ) (ohms) Farads (capacitance)  mega (10 ) (ohms) Ohms Hertz (frequency) Volts Percent (duty ratio) Relative Alternating current AUTO Autoranging Direct current HOLD Display hold ºF Degrees Fahrenheit ºC Degrees Centigrade EX420A-en-GB_v4.0 6/16...

  • Page 6: Dc Voltage Measurements

    Insert the red test lead banana plug into the positive V jack. 4. Touch the black test probe tip to the negative side of the circuit. Touch the red test probe tip to the positive side of the circuit. 5. Read the voltage in the display. EX420A-en-GB_v4.0 6/16...

  • Page 7: Ac Voltage Measurements

    7. Touch the black test probe tip to the negative side of the circuit. Touch the red test probe tip to the positive side of the circuit. 8. Apply power to the circuit. 9. Read the current in the display. EX420A-en-GB_v4.0 6/16...

  • Page 8: Ac Current Measurements

    4. Touch the test probe tips across the circuit or part under test. It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading. 5. Read the resistance in the display. EX420A-en-GB_v4.0 6/16...

  • Page 9: Continuity Check

    4. Touch the test probes to the diode under test. Forward voltage will typically indicate 0.400 to 0.700V. Reverse voltage will indicate “OL”.. Shorted devices will indicate near 0V and an open device will indicate “OL” in both polarities. EX420A-en-GB_v4.0 6/16...

  • Page 10: Capacitance Measurements

    (about 30 seconds). 4. Read the temperature in the display. Note: The temperature probe is fitted with a type K mini connector. A mini connector to banana connector adaptor is supplied for connection to the input banana jacks. EX420A-en-GB_v4.0 6/16...

  • Page 11: Autoranging/Manual Range Selection

    10A or uA/mA input jack and a non-current (green, black or red) function is selected. If this occurs, turn the meter off and reinsert the test lead into the proper input jack for the function selected. EX420A-en-GB_v4.0 6/16...

  • Page 12: Specifications

    (3.0% reading + 5 digits) 4F 0.001F (3.5% reading + 5 digits) 40F 0.01F (5.0% reading + 5 digits) 100F 0.1F NOTE: Accuracy is stated at 18 C to 28 C (65 F to 83 F) and less than 75% RH. EX420A-en-GB_v4.0 6/16...
  • Page 13 187 x 81 x 50mm (7.36” x 3.2” x 2.0”) (includes holster) Safety For indoor use and in accordance with the requirements for double insulation to: IEC61010-1 (EN61010-1), 2010, 3rd edition for Overvoltage Category III 600V, Pollution Degree 2. EX420A-en-GB_v4.0 6/16...

  • Page 14: Maintenance

    WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place and fastened securely. NOTE: If your meter does not work properly, check the fuses and batteries to make sure that they are still good and that they are properly inserted. EX420A-en-GB_v4.0 6/16...

  • Page 15: Replacing The Fuses

    8. Align the center board with the connectors and gently press into place. 9. Replace and secure the rear cover, battery and battery cover. WARNING: To avoid electric shock, do not operate your meter until the fuse cover is in place and fastened securely. Copyright © 2013‐2016 FLIR Systems, Inc.  All rights reserved including the right of reproduction in whole or in part in any form  ISO‐9001 Certified  www.extech.com  EX420A-en-GB_v4.0 6/16...

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