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Extech Instruments 470 Bedienungsanleitung
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Extech Instruments 470 Bedienungsanleitung

True rms-multimeter plus ir-thermometer
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Inhaltszusammenfassung für Extech Instruments 470

  • Seite 11 User's Guide True RMS Multimeter plus IR Thermometer Extech 470 Patent Pending...
  • Seite 12 Introduction Congratulations on your purchase of the Extech 470 (part number EX470) True RMS Autoranging Multimeter plus IR Thermometer. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency, Duty Cycle, Diode Test, and Continuity plus Thermocouple and Non-Contact IR Temperature. Proper use and care of this meter will provide many years of reliable service.

  • Seite 13: Overvoltage Category

    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.
  • Seite 14 Controls and Jacks 1. IR Thermometer and laser pointer 2. 4000 count LCD display 3. HOLD and Backlight button 4. SELECT button 5. Function switch 6. mA, uA and A input jacks 7. COM input jack 8. Positive input jack 9.

  • Seite 15: Specifications

    Specifications Function Range Resolution Accuracy 400mV 0.1mV ±(0.3% reading + 2 digits) Voltage 0.001V ±(0.5% reading + 2 digits) 0.01V 400V 0.1V 1000V ±(0.8% reading + 3 digits) 50 to 400Hz 400Hz to 1kHz Voltage ±(1.5% reading ±(2.5% reading 400mV 0.1mV + 15 digits) + 15digits)
  • Seite 16 Function Range Resolution Accuracy Resistance ±(0.8% reading + 4 digits) 400Ω 0.1Ω ±(0.8% reading + 2 digits) 4kΩ 0.001kΩ 40kΩ 0.01kΩ ±(1.0% reading + 2 digits) 400kΩ 0.1kΩ 4MΩ 0.001MΩ ±(3.0% reading + 5 digits) 40MΩ 0.01MΩ ±(5.0% reading + 7 digits) Capacitance 40nF 0.01nF...
  • Seite 17 Diode Test Test current of 0.3mA maximum, open circuit voltage 1.5V DC typical Continuity Check Audible signal will sound if the resistance is less than 150Ω (approx.), test current <0.7mA Temperature Sensor Requires type K thermocouple IR Spectral response 6 to 16µm IR Emissivity 0.95 fixed IR distance ratio...

  • Seite 18: 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.

  • Seite 19: 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.

  • Seite 20: Dc Current Measurements

    DC 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.

  • Seite 21: 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.

  • Seite 22: Resistance Measurements

    RESISTANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements. Remove the batteries and unplug the line cords. 1. Set the function switch to the green Ω position.

  • Seite 23: 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. Insert the red test lead banana plug into the positive Ω...
  • Seite 24 CONTACT TEMPERATURE MEASUREMENTS 1. Set the function switch to the black Type K ºF or ºC position. 2. Insert the Temperature Probe into the input jacks, making sure to observe the correct polarity. 3. Touch the Temperature Probe head to the part whose temperature you wish to measure.
  • Seite 25 NON-CONTACT TEMPERATURE MEASUREMENTS 1. Set the function switch to the red IR Non-Contact ºF or ºC 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.

  • Seite 26: Frequency Measurements

    CAPACITANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any capacitance measurements. Remove the batteries and unplug the line cords. 1. Set the rotary function switch to the green position.
  • Seite 27 AUTORANGING/MANUAL RANGE SELECTION When the meter is first turned on, it automatically goes into AutoRanging. This automatically selects the best range for the measurements being made and is generally the best mode for most measurements. For measurement situations requiring that a range be manually selected, perform the following: Press the RANGE key.

  • Seite 28: Display Backlight

    DISPLAY BACKLIGHT Press and hold the HOLD key for >1 second to turn on or off the display backlight function. The backlight will automatically turn off after 30 seconds. Note: The HOLD feature will activate when the Backlight is turned on. Press the HOLD key again to exit Hold. HOLD The hold function freezes the reading in the display.

  • Seite 29: Maintenance

    Maintenance WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the back cover or the battery or fuse covers. WARNING: To avoid electric shock, do not operate your meter until the battery and fuse covers are in place and fastened securely.

  • Seite 30: Battery Installation

    BATTERY INSTALLATION WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery cover. 1. Turn power off and disconnect the test leads from the meter. 2. Open the rear battery cover by removing two screws (B) using a Phillips head screwdriver.

  • Seite 31: Replacing The Fuses

    REPLACING THE FUSES WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the fuse cover. 1. Disconnect the test leads from the meter. 2. Remove the protective rubber holster. 3. Remove the battery cover (two “B” screws) and the battery. 4.
  • Seite 32 Extech recommends that calibration be performed on an annual basis to ensure calibration integrity. Copyright © 2003 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form.

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