Extech Instruments MG320 User Manual
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Extech Instruments MG320 User Manual

Insulation tester + dmm
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USER MANUAL
Insulation Tester + DMM
Model MG320

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Summary of Contents for Extech Instruments MG320

  • Page 1 USER MANUAL Insulation Tester + DMM Model MG320...
  • Page 2 7    6.1 Display Backlight    6.2 Data Hold    6.3 Low Battery Indication    6.4 DC VOLTAGE MEASUREMENTS    6.5 AC VOLTAGE MEASUREMENTS    6.6 LOW RESISTANCE / CONTINUITY MEASUREMENTS    6.7 INSULATION RESISTANCE MEASUREMENTS    6.7.1 Disable Insulation Test Lock Mode    6.7.2 Insulation Resistance Test Time Setup    6.7.3 Dielectric Absorption Ratio [DAR] Insulation Testing    6.7.4 Polarization Index [PI] Insulation Testing    6.7.5 Comparator Utility  7.  DATA RECORDING  12  8.  MAINTENANCE  13    8.1 BATTERY INSTALLATION    8.2 REPLACING THE FUSE  9.  SPECIFICATIONS  14  MG320-en-GB_v1.1 1/17...

  • Page 3: Introduction

    1. Introduction  Congratulations on your purchase of the MG320 True RMS Insulation Resistance CAT IV 600V DMM. The MG320 features a rugged design for heavy duty use. The MG320 measures Insulation Resistance, AC/DC Voltage, and Resistance. Insulation Resistance tests are automatic ranging with 5 test voltages from 50V to 1000V. The MG320 can store and recall up to 99 measurements.

  • Page 4: Safety Instructions

    7. NEVER operate the meter unless the battery/fuse cover is in place and fastened securely. 8. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. MG320-en-GB_v1.1 1/17...

  • Page 5: Safety Standards

    4. Low Resistance/Continuity (+) positive input jack 5. Low Resistance/Continuity (-) COM input jack 6. Insulation and Voltage (-) COM input jack 7. Insulation and Voltage (+) positive input jack 8. Test Voltage alert LED indicator Note: Tilt stand and battery compartment on back MG320-en-GB_v1.1 1/17...

  • Page 6: Control Buttons

    10. PI/DAR timer information 11. Bargraph measurement representation 12. Comparator area: Test pass [PASS], test fail [NG], units [K, M, G], and reference value. 13. Main measurement display digits 14. Display Hold Icon (freeze/unfreeze display) 15. Save/Recall readings (01-99) MG320-en-GB_v1.1 1/17...

  • Page 7: Display Backlight

    Short press the H (Hold) button to freeze (H icon displayed) or unfreeze (no H icon displayed) the displayed reading. Note that the Auto Power OFF function activates after 3 minutes of inactivity. The meter will audibly beep just prior to shutting off. MG320-en-GB_v1.1 1/17...

  • Page 8: Ac Voltage Measurements

    Note that the Auto Power OFF function activates after 3 minutes of inactivity. The meter will audibly beep just prior to shutting off. Note that the Auto Power OFF function activates after 3 minutes of inactivity. The meter will audibly beep just prior to shutting off. MG320-en-GB_v1.1 1/17...

  • Page 9: Low Resistance / Continuity Measurements

    Short press the H (Hold) button to freeze (H icon displayed) or unfreeze (no H icon displayed) the displayed reading. Press to store the reading Note that the Auto Power OFF function activates after 3 minutes of inactivity. The meter will audibly beep just prior to shutting off. MG320-en-GB_v1.1 1/17...

  • Page 10: Insulation Resistance Measurements

    To disable test lock mode, press and hold the button until the lock icon switches off and then press and hold the TEST button for the duration of the test (TEST will be displayed). Release the button to stop the test. MG320-en-GB_v1.1 1/17...

  • Page 11: Insulation Resistance Test Time Setup

    ‘test voltage alert’ LED illuminates. 9. If the insulation breaks down during the test, the meter emits audible tone and buzzer. 10. Press the TEST button to stop the test and activate the discharging circuit. MG320-en-GB_v1.1 1/17...

  • Page 12: Data Recording

    4M, 5M, 10M, 20M, 30M, 40M, and 50M. 5. The Continuity comparator preset options are: 1, 2, 5, 10, and 20Ω. 7. Data Recording  The MG320 can store, recall, and clear up to 99 readings (01-99). Press the button to save a displayed reading.

  • Page 13: Maintenance

    4. Always use a fuse of the proper size and value (500mA/600V fast blow). 5. Replace and secure the rear battery cover. WARNING: To avoid electric shock, do not operate meter until the fuse cover is in place and fastened securely. MG320-en-GB_v1.1 1/17...

  • Page 14: Specifications

    50V: 0.01M~50.0M (alert buzzer sounds when resistance is <1M) 100V: 0.01M~100.0M (alert buzzer sounds when resistance is <1M) 250V: 0.01M~200.0M (alert buzzer sounds when resistance is <4M) 500V: 0.01M~500M (alert buzzer sounds when resistance is <4M) 1000V: 0.01M~10.0G (alert buzzer sounds when resistance is <4M) MG320-en-GB_v1.1 1/17...

  • Page 15: General Specifications

    This instrument is designed in strict compliance with safety standard IEC61010, overvoltage standard (CAT IV 600V) and pollution degree II. Copyright © 2017 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form www.extech.com MG320-en-GB_v1.1 1/17...

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