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Summary of Contents for Extech Instruments MN45
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Page 1: Digital Multimeter
User's Guide Digital Multimeter Model MN42... -
Page 2: Safety Instructions
Introduction Congratulations on your purchase of the Extech MN42 MultiMeter. The MN42 offers AC/DC Voltage, DC Current, and Resistance testing. Proper use and care of this meter will provide many years of reliable service. Safety This symbol adjacent to another symbol, terminal or operating device indicates that the operator must refer to an explanation in the Operating Instructions to avoid personal injury or damage to the meter. -
Page 3: Controls And Jacks
Controls and Jacks 1. Non-Contact Voltage Sensor 2. LCD Display 3. Function switch 4. Positive jack 5. COM jack 6. 10A jack Note: Tilt stand, fuse, and battery compartment are on rear of unit. Symbols •))) Continuity Diode µ micro (amps) milli (volts, amps) kilo (ohms) Ω... -
Page 4: Non-Contact Voltage (Ncv)
Operating Instructions NON-CONTACT VOLTAGE (NCV) WARNING: Always test the NCV function on a know live circuit before use Turn the rotary switch to any measurement position Hold the top of the meter very close to the voltage source as shown. If voltage is present, the LED above the display will glow and the meter will buzz. -
Page 5: Dc Voltage Measurements
DC VOLTAGE MEASUREMENTS CAUTION: Do not measure DC voltages if a motor on the circuit is being switched ON or OFF. Large voltage surges may occur that can damage the meter. Set the function switch to the highest VDC position. Insert the black test lead banana plug into the negative COM jack. -
Page 6: 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. Set the function switch to the highest Ω position. Insert the black test lead banana plug into the negative COM jack. -
Page 7: Diode Test
DIODE TEST Set the function switch to the position. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive jack. Touch the test probes to the diode under test. Forward voltage will indicate 400 to 700mV.Reverse voltage will indicate “1”. -
Page 8: 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. -
Page 9: Range Specifications
Range Specifications Function Range Resolution Accuracy DC Voltage 200mV 0.1mV (V DC) ±(0.5% reading + 2 digits) 2000mV 0.01V 200V 0.1V ±(0.8% reading + 2 digits) 600V AC Voltage 200V 0.1V ±(1.2% reading + 10 digits) (VAC) 50/60Hz 600V ±(2.0% reading + 4 digits) DC Current 2000µA 1µA... -
Page 10: General Specifications
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation. Note – Examples include electricity meters and primary over-current protection equipment Copyright © 2010 Extech Instruments Corporation (a FLIR company). All rights reserved including the right of reproduction in whole or in part in any form.
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