Extech Instruments EX623 User Manual
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Extech Instruments EX623 User Manual

400amp true rms ac/dc clamp meter with ir thermometer
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User's Guide
400Amp True RMS AC/DC Clamp Meter
with IR Thermometer
Model EX623

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Summary of Contents for Extech Instruments EX623

  • Page 1 User's Guide 400Amp True RMS AC/DC Clamp Meter with IR Thermometer Model EX623...
  • Page 2 Introduction Congratulations on your purchase of this Extech EX623 True RMS Clamp Meter. This meter measures AC Current, DC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Diode Test, Duty Cycle and Continuity. Special features include Dual Input Thermocouple Temperature, Non-Contact IR Temperature and Non-Contact Voltage detector.

  • Page 3: Safety Notes

    Function Maximum Input A AC, 400A DC/AC A DC 400A DC/AC V DC, V AC 600V DC/AC Resistance, Capacitance, Frequency, Diode Test 250V DC/AC A 4000 A Type K Temperature 30V DC, 24V AC EX623-en-GB_v3.0 4/15...

  • Page 4: Meter Description

    Hertz (Frequency) Duty Ratio F and Fahrenheit and Celsius units (Temperature) Therocouple 1, Thermocouple 2, Thermocouple difference n, m, , M, k Unit of measure prefixes: nano, milli, micro, mega, and kilo Continuity test  Diode test Laser pointer EX623-en-GB_v3.0 4/15...

  • Page 5: Operation

    NOTE: The detector is designed with high sensitivity. Static electricity or other sources of energy may randomly trip the sensor. This is normal operation. EX623-en-GB_v3.0 4/15...

  • Page 6: Ac/Dc Current Measurements

    Polarity When measuring from front to back of the EX623 the meter will display a minus (-) sign before the measurement. If the user requires a positive (+) sign displayed, the meter must be tested from back to front. DCA Zero The Zero feature removes offset values and improves accuracy for DC current measurements.

  • Page 7: Resistance Measurements

     If one reading displays a value (typically 0.400V to 01.800V) and the other reading displays OL, the diode is good.  If both readings display OL the device is open.  If both readings are very small or ‘0’, the device is shorted. EX623-en-GB_v3.0 4/15...

  • Page 8: Capacitance Measurements

    Touch the red test probe tip to the other side of the device. Read the Frequency value on the upper large display. Read the Duty Ratio on the lower small display. Press the MODE button to display the Duty Ratio on the large display. EX623-en-GB_v3.0 4/15...

  • Page 9: Type K Temperature Measurements

    Read the temperature on the display. Press the T1-T2 button to step through the display combinations: Upper display Lower display T1-T2 T1- T2 Note: In case of an open input or a temperature overrange, the meter will display “- - - -” . EX623-en-GB_v3.0 4/15...
  • Page 10 The meter may not make accurate measurements through transparent surfaces such as glass. Steam, dust, smoke, etc. can obscure measurements. To find a hot spot, aim the meter outside the area of interest then scan across (in an up and down motion) until the hot spot is located. EX623-en-GB_v3.0 4/15...

  • Page 11: Lcd Backlight

    APO is now disabled (APO icon is off) and will be reset when the Function switch is returned to the OFF position. Low battery indication When the icon appears in the display, the battery should be replaced. Refer to the battery replacement procedure in the maintenance section. EX623-en-GB_v3.0 4/15...

  • Page 12: Maintenance

    Fuse Replacement Remove the battery Remove the Phillips head screws (2) that secure the rear cover. Replace the fuse with one of equal rating. (200mA, 660V ceramic fast blow, 5x20mm [SIBA 70-180-40] Replace the rear cover and battery EX623-en-GB_v3.0 4/15...

  • Page 13: Specifications

    Capacitance 400.00nF 0.01nF ±(5.0% + 40 digits) 4000.0nF 0.1nF ±(3.0% + 10 digits) 400.00µF 0.01µF ±(3.5% + 10 digits) 4000.0µF 0.1µF ±(5.0% + 10 digits) 40.000mF 0.001mF Frequency 400.00Hz 0.01Hz ±(1.0% + 3 digits) (clamp) Sensitivity: 5Arms minimum EX623-en-GB_v3.0 4/15...
  • Page 14 -58 to -4°F ± 5°C/9°F -50 to -20°C -4 to 31°F ±2% of reading or ±2°C/4°F -20 to -1°C whichever is greater 0.1° 32°F ±1°C/2°F 0°C 33 to 518°F ±2% of reading or ±2°C/3°F 1 to 270°C whichever is greater EX623-en-GB_v3.0 4/15...
  • Page 15 For indoor use and in accordance with the requirements for double insulation to IEC1010-1 (2001): EN61010-1 (2001) Overvoltage Category III 600V and Category II 1000V, Pollution Degree 2. Approvals Patent notice U.S. Patent 7163336 Copyright © 2013‐2015 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  EX623-en-GB_v3.0 4/15...

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