User Manual
Mini Digital Multimeter
Model MN15A
Additional User Manual Translations available at www.extech.com
Introduction
Congratulations on your purchase of the Extech MN15A MultiMeter. The MN15A offers AC/DC Voltage,
AC/DC Current, Resistance, Diode, and Continuity testing plus Type K thermocouple temperature measurements. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website ( www.extech.com
) to check for the latest version and translations of this User Manual, Product Updates, Product Registration, and Customer Support.
Safety
WARNING
CAUTION
MAX
600V
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.
This WARNING symbol indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.
This CAUTION symbol indicates a potentially hazardous situation, which if not avoided, may result damage to the product.
This symbol advises the user that the terminal(s) so marked must not be connected to a circuit point at which the voltage with respect to earth ground exceeds 600V.
This symbol adjacent to one or more terminals identifies them as being associated with ranges that may, in normal use, be subjected to particularly hazardous voltages. For maximum safety, the meter and its test leads should not be handled when these terminals are energized.
This symbol indicates that a device is protected throughout by double insulation or reinforced insulation.
SAFETY INSTRUCTIONS
This meter has been designed for safe use, but must be operated with caution. The rules listed below must be carefully followed for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specified maximum:
Function
VDC or VAC
VDC or VAC 200mV range
Input Protection Limits
Maximum Input
600VAC and VDC
200Vrms mA AC/DC
A AC/DC
200mA 600V fast acting fuse
10A 600V fast acting fuse
(for 30 seconds max. every 15 minutes.)
Resistance, Continuity 250Vrms for 15 sec. max.
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above earth ground.
4. NEVER connect the meter leads across a voltage source while the function switch is in the current, resistance, or diode mode. Doing so can damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests.
6. ALWAYS turn off power and disconnect test leads before opening the covers to replace the fuse or battery.
7. NEVER operate the meter unless the back cover and the battery and fuse covers are 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.
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Controls and Jacks
1. LCD display
2. Rotary function switch
3. 10 ampere test lead jack
4. Test lead jack for voltage, milliamp, resistance/continuity, diode and temperature functions
5. COM test lead jack
6. Battery compartment (rear)
SYMBOLS
•)))
M k
Continuity
AC megga (10 6 ) (ohms) kilo (10 3 ) (ohms)
A Amps
BAT Battery test
°F Degrees Fahrenheit m
V
Ω
°C
Diode
DC milli (10 -3 ) (volts, amps)
Volts
Ohms
Degrees Celsius
Low battery indicator
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Operating Instructions
WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care.
NOTE: On some low AC and DC voltage ranges, with the test leads not connected to a device, the display may show a random, changing reading. This is normal and is caused by the high-input sensitivity. The reading will stabilize and give a proper measurement when connected to a circuit.
AC VOLTAGE MEASUREMENTS
WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts inside some 240V outlets for appliances because the contacts are recessed deep in the outlets. As a result, the reading may show 0 volts when the outlet actually has voltage on it. Make sure the probe tips are touching the metal contacts inside the outlet before assuming that no voltage is present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being switched ON or OFF.
Large voltage surges may occur that can damage the meter.
1. Set the function switch to the 600 VAC position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the neutral side of the circuit.
4. Touch the red test probe tip to the “hot” side of circuit.
5. Read the voltage in the display.
6. If the reading is less than 200V, switch to the 200V range to improve resolution.
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.
1. Set the function switch to the highest 600VDC position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the negative side of the circuit. Touch the red test probe tip to the positive side of the circuit.
4. Read the voltage in the display.
5. If the reading is less than the maximum of a lower range, switch to that range to improve resolution.
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DC CURRENT MEASUREMENTS
CAUTION: Do not make current measurements at 10 Amps for longer than 30 seconds. Exceeding
30 seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 200mA, set the function switch to the 200mA position and insert the red test lead banana plug into the
mA jack.
3. For current measurements up to 10A, set the function switch to the
10A position and insert the red test lead banana plug into the 10A jack.
4. Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.
5. Touch the black test probe tip to the negative side of the circuit. Touch the red test probe tip to the positive side of the circuit.
6. Apply power to the circuit.
7. Read the current in the display.
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RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements.
1. Set the function switch to the highest
Ω position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive
Ω jack.
3. Touch the test probe tips across the circuit or part under test.
4. Read the resistance in the display. Move the function switch to successively lower
Ω ranges to obtain a higher resolution reading.
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity on circuits that have a voltage potential.
1. Set the function switch to the position.
2. Insert the black lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive
Ω jack.
3. Touch the test probe tips to the circuit or wire you wish to check.
4. If the resistance is less than approximately 100
Ω, the audible signal will sound. If the circuit is open, the display will indicate “1.”.
DIODE TEST
1. Set the function switch to the position.
2. Insert the black test lead banana plug into the negative COM jack
Insert the red test lead banana plug into the positive jack.
3. Touch the test probes to the diode under test.
4. A typical diode will indicate approximately .400 to .500 volts for the forward test and “1.” for the reverse test.
5. A shorted diode will indicate a low value in both the reverse and forward test directions. An open diode will indicate “1.” in both test directions.
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BATTERY VOLTAGE TEST
CAUTION: Do not measure batteries while they are installed in the devices they are powering. The batteries must be removed from installations before tests can be made.
1. Set the function switch to the 1.5V or 9V BAT switch position. Use the
1.5V position for ‘AAA’, ‘AA’, ‘C’, ‘D’, and other 1.5V batteries. Use the
9V position for square 9V transistor batteries.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the negative side of the battery.
Touch the red test probe tip to the positive side of the battery.
4. Read the voltage in the display.
TEMPERATURE MEASUREMENTS
1. Set the function switch to the °F or °C position.
2. Insert the Temperature Probe into the COM and Temp jacks, making sure to observe the correct polarity.
3. Touch the Temperature Probe head to the part to be measured. Keep the probe touching the part under test until the reading stabilizes.
4. Read the temperature in the display.
Note: The temperature probe is fitted with a type K mini connector.
A mini connector to banana connector adaptor is supplied for connection to the input banana jacks.
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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.
This MultiMeter is designed to provide years of dependable service, if the following care instructions are performed:
1. KEEP THE METER DRY. If it gets wet, wipe it off.
2. USE AND STORE THE METER IN NORMAL TEMPERATURES. Temperature extremes can shorten the life of the electronic parts and distort or melt plastic parts.
3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping it can damage the electronic parts or the case.
4. KEEP THE METER CLEAN. Wipe the case occasionally with a damp cloth. DO NOT use chemicals, cleaning solvents, or detergents.
5. USE ONLY FRESH BATTERIES OF THE RECOMMENDED SIZE AND TYPE. Remove old or weak batteries so they do not leak and damage the unit.
6. IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME, the battery should be removed to prevent damage to the unit.
BATTERY/FUSE INSTALLATION and LOW BATTERY INDICATION
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery cover. Do not operate meter unless the battery is in place.
LOW BATTERY INDICATION
The icon will appear in the display when the battery voltage becomes low. Replace the battery when this appears.
BATTERY REPLACEMENT
1. Disconnect the test leads from the meter.
2. Remove the 2 Phillips head screws located on the back of the instrument and remove the battery cover.
3. Replace the 9V battery.
4. Secure the fuse/battery compartment cover.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection sites, the retail store where the batteries were purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end-of-life devices to a designated collection point for the disposal of electrical and electronic equipment
Battery Safety Reminders o Please dispose of batteries responsibly; observe local, state, and national regulations. o Never dispose of batteries in a fire; batteries may explode or leak. o Never mix battery types; install new batteries of the same type
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FUSE REPLACEMENT
1. Disconnect the test leads from the meter.
2. Remove the 2 Phillips head screws located on the back of the instrument and remove the battery cover.
3. Gently remove the fuse(s) and install the new fuse(s) into the holder(s).
4. Always use fuses of the proper size and value (200mA/600V (5x20mm) ceramic fast blow for the mA / µA ranges, 10A/600V (5x20mm) ceramic fast blow for the A range).
5. Secure the fuse/battery compartment cover.
WARNING: To avoid electric shock, do not operate your meter until the fuse cover is in place and fastened securely.
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Range Specifications
Function Range Resolution Accuracy
DC Voltage
(V DC)
200mV
2000mV
20V
200V
0.1mV
1mV
0.01V
0.1V
±(0.5% reading + 2 digits)
AC Voltage
(V AC)
600V
200V
600V
200mA
1V
0.1V
1V
0.1mA DC Current
(A DC)
Resistance
Battery Test
Temperature
10A
200
Ω
2000
Ω
20k
Ω
200k
Ω
20M
Ω
9V
1.5V
-20°C to 750°C
-4°F to 1400°F
10mA
0.1
Ω
1
Ω
0.01k
Ω
0.1k
Ω
10k
Ω
10mV
1mV
1°C
1°F
Notes:
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.
±(0.8% reading + 2 digits)
±(1.2% reading + 10 digits
(50/60Hz)
±(1.2% reading + 2 digits)
±(2.0% reading + 2 digits)
±(0.8% reading + 2 digits)
±(1.5% reading + 2 digits)
±(1.0% reading + 2 digits)
±(3% of reading +5°C/9°F)
Accuracy is stated at 18°C to 28°C (65°F to 83°F) and less than 75% RH.
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General Specifications
Diode Test
Continuity Check
Input Impedance
AC Bandwidth
Display
Overrange indication
Polarity
Measurement Rate
Bias voltage: 2.8VDC typical
Audible signal will sound if the resistance is less than 100
Ω
1
MΩ (VDC & VAC)
50 / 60Hz
2000 count (0 to 1999) LCD
“1___” is displayed
Automatic (no indication for positive); Minus (-) sign for negative
2 times per second, nominal
Low Battery Indication
Battery
Fuses
Operating Temperature
Storage Temperature
Operating Humidity
Storage Humidity
Operating Altitude
Weight
Size
“ ” is displayed
One (1) 9V battery (NEDA 1604) mA range; 200mA/600V ceramic fast blow (5x20mm)
A range; 10A/600V ceramic fast blow (5x20mm)
0°C to 50°C (32°F to 122°F)
-20°C to 60°C (-4°F to 140°F)
Max 70% up to 31°C (87°F) decreasing linearly to 50% at 50°C (122°F)
< 80% RH
2000 meters (7000 ft.) maximum.
255g (9.17 oz)
132 x 66 x 38mm (5.2” x 2.6” x 1.5”)
Approvals CE, ETL
Safety This meter is intended for indoor use and protected, against the users, by double insulation per EN61010-1 and IEC61010-
1 3rd Edition (2010) to CAT III 600V; Pollution Degree 2. The meter also
meets UL 61010-1, Third Edition (2012), CAN/CSA C22.2 No. 61010-
1, Third Edition (2012), IEC61010-2-033 1st Ed. (2012).
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 overvoltages 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.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
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
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