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Summary of Contents for Extech Instruments MG300
- Page 1 User's Guide Wireless TRMS Multimeter and Insulation Tester Model MG300...
- Page 2 Introduction Congratulations on your purchase of the MG300 True RMS MultiMeter Insulation Resistance Tester. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency (electrical & electronic), Duty Cycle, Diode Test, Insulation Resistance, and Continuity plus Thermocouple Temperature. The MG300 can store and recall measurement data and features a waterproof, rugged design for heavy duty use.
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Page 3: Safety Instructions
NEVER operate the meter unless the back cover and the battery and fuse covers are in place and fastened securely. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. MG300-EN V2.0 4/11... -
Page 4: Symbols And Annunciators
Display hold ºF Degrees Fahrenheit ºC Degrees Celsius Maximum Minimum Serial number second Setup parameter AC +DC Alternating current + Direct current TRMS True RMS Store Recall AUTO Auto Range Auto Power off enabled Backlight Auxiliary Displays MG300-EN V2.0 4/11... -
Page 5: Dc Voltage Measurements
Press the MODE button again to indicate “%”. Read the % of duty cycle in the main display. Press EXIT to return to AC volts display 10. With ACV in the main display, press and hold EXIT for 2 seconds to measure AC+DC. MG300-EN V2.0 4/11... -
Page 6: Mv Voltage Measurements
Read the current in the display. AC+DC In the VAC, mV(AC), 10A(AC), mA(AC) and uA(AC) measurement modes, press the EXIT button for 2 seconds to enter AC+DC test mode. The LCD shows the AC+DC icon. Press EXIT to exit this mode. MG300-EN V2.0 4/11... -
Page 7: Ac Current (Frequency, Duty Cycle) Measurements
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. Read the resistance in the display. MG300-EN V2.0 4/11... -
Page 8: Continuity Check
Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive V jack. Press the MODE button to indicate “F” Touch the test leads to the capacitor to be tested. Read the capacitance value in the display MG300-EN V2.0 4/11... -
Page 9: Temperature Measurements
Hz jack. Touch the test probe tips to the circuit under test. Read the frequency on the display. Press the MODE button to indicate “%”. Read the % duty cycle in the display. MG300-EN V2.0 4/11... -
Page 10: Insulation Resistance Measurements
Subsequently, the meter will internally discharge the balance of the insulation test voltage. Note: Turning the function switch to another test position or pressing the EXIT button will abort an Insulation resistance test. RANGE MG300-EN V2.0 4/11... -
Page 11: Autoranging/Manual Range Selection
The main display shows the Relative value (measured value minus the stored value). AC+DC In the VAC, mV(AC), 10A(AC), mA(AC) and uA(AC) measurement modes, press the EXIT button for 2 seconds to enter AC+DC test mode. The LCD shows the AC+DC icon. Press EXIT to exit this mode. MG300-EN V2.0 4/11... -
Page 12: Display Backlight
Press the EXIT button to end the recall session. CLEAR ALL DATA From the OFF position, press and hold the RANGE button while turning the function switch to any on position Release the RANGE button. The memory has been cleared. MG300-EN V2.0 4/11... -
Page 13: Alarm Limits
Press the SETUP button to step through the other functions and return to the normal operating mode. The meter will “beep” if the measured value is greater than the high limit or lower than the low limit. LOW BATTERY INDICATION When the icon appears in the display, the battery should be replaced. MG300-EN V2.0 4/11... -
Page 14: Maintenance
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle WARNING: To avoid electric shock, do not operate your meter until the battery cover is in place and fastened securely. MG300-EN V2.0 4/11... -
Page 15: Replacing The Fuses
—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. —Consult the dealer or an experienced radio/TV technician for help. Warning: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. MG300-EN V2.0 4/11... -
Page 16: Specifications
(20A: 30 sec max with reduced accuracy) All AC voltage ranges are specified from 5% of range to 100% of range NOTE: Accuracy is stated at 65 F to 83 F (18 C to 28 C) and less than 75% RH. MG300-EN V2.0 4/11... - Page 17 0mA=-25%, 4mA=0%, 20mA=100%, 24mA=125% Note: Accuracy specifications consist of two elements: (% reading) – This is the accuracy of the measurement circuit. (+ digits) – This is the accuracy of the analog to digital converter. MG300-EN V2.0 4/11...
- Page 18 400.1~4000 MΩ 1MΩ +(4%+5) Note: Accuracy specifications consist of two elements: (% reading) – This is the accuracy of the measurement circuit. (+ digits) – This is the accuracy of the analog to digital converter. MG300-EN V2.0 4/11...
- Page 19 7.8” x 3.6” x 1.9” (200 x 92 x 50mm) Safety This meter is intended for origin of installation use and protected, against the users, by double insulation per EN61010-1 and IEC61010-1 2 Edition (2001) to Category IV 600V and Category III 1000V; Pollution Degree 2. MG300-EN V2.0 4/11...
- Page 20 Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.
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