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Summary of Contents for Extech Instruments MG320-NIST
- Page 1 ® EXTECH USER MANUAL /NSTRUMENTS Insulation Tester+ DMM Model MG320 �· ,-, ,-, TES T/ um - - Lf .L f > � � � � lnnl111ll1111h111hn1h111l1111h Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 TestEquipmentDepot.com...
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Page 2: Symbols And Annunciators
Table of Contents INTRODUCTION 3 SAFETY 3 METER DESCRIPTION 5 CONTROL BUTTONS 6 SYMBOLS AND ANNUNCIATORS 6 OPERATING INSTRUCTIONS 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 DATA RECORDING 12 MAINTENANCE 13 ... - Page 3 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.
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Page 4: Safety Instructions
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY OVERVOLTAGE CATEGORY I Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient over-voltages to an appropriate low level. Note – Examples include protected electronic circuits. OVERVOLTAGE CATEGORY II Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation. -
Page 8: Ac Voltage Measurements
some 240V ou lets for appliances because the contacts are recessed deep in the outlets. As a result, the reading Do not measure AC voltages if a motor on the circuit is being switched ON or OFF. Large voltage surges may Do not measure AC voltages if a motor on the circuit is being switched ON or OFF. -
Page 12: Data Recording
6.7.5 Comparator Utility Read and understand all operations and safety information contained in the Insulation Resistance and Continuity measurement sections and the Safety section before continuing. In Comparator mode the meter compares measurement to a preset reference values and displays PASS (measured value greater than reference value) or NG (measured value lower than reference value). -
Page 14: Specifications
9. Specifications Function Range Resolution Accuracy (2.0% reading + 3 digits) DC Voltage 600V 0.1V (2.0% reading + 3 digits) AC Voltage 600V 0.1V Specified from 5% of range to 100% of range Input impedance: 10M Min. Measured Voltage: 0.1V Frequency 50~400Hz Input protection: 600V DC and AC rms (1.5% reading + 3 digits) -
Page 15: General Specifications
Insulation Resistance Test Voltage Outputs Test Short-circuit Output Voltage Test Steps (50~120%) Load Overload current current 50V (0%~+10%) 10% steps (25~60V) 50kΩ 250VAC/DC ≤2mA 100V (0%~+10%) 10% steps (50~120V) 100kΩ 250VAC/DC ≤2mA 250V (0%~+10%) 10% steps (125~300V) 250kΩ 250VAC/DC ≤2mA 500V (0%~+10%) 10% steps (250~600V) 500kΩ...