Extech Instruments MN15A Manual de usuario

User's Guide

Mini Digital Multimeter

Model MN15A

MN15A V1.1 02/09

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. 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.

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:

Input Protection Limits

Function Maximum Input

VDC or VAC 600VAC and VDC

VDC or VAC 200mV range 200Vrms

mA AC/DC 200mA 250V fast acting fuse

A AC/DC 10A 250V 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.

WARNING

CAUTION

MAX

600V

MN15A V1.1 02/09

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

•))) Continuity Diode

AC DC

M megga (106) (ohms) m milli (10-3) (volts, amps)

k kilo (103) (ohms) V Volts

A Amps Ω Ohms

BAT Battery test °C Degrees Celsius

°F Degrees Fahrenheit Low battery indicator

MN15A V1.1 02/09

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 Vjack.

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 Vjack.

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.

MN15A V1.1 02/09

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.

MN15A V1.1 02/09

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 Ωjack.

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 Ωranges 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 Ωjack.

3. Touch the test probe tips to the circuit or wire you wish to check.

4. If the resistance is less than approximately 100Ω, 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.

MN15A V1.1 02/09

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 Vjack.

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.

MN15A V1.1 02/09

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.

5. Dispose of the old battery as required by local regulations.

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/660V ceramic fast blow for the

mA / µA ranges, 10A/250V 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.

MN15A V1.1 02/09

Range Specifications

Function Range Resolution Accuracy

DC Voltage

(V DC)

200mV 0.1mV

±(0.5% reading + 2 digits)

2000mV 1mV

20V 0.01V

200V 0.1V

±(0.8% reading + 2 digits)

600V 1V

AC Voltage

(V AC)

200V 0.1V

±(1.2% reading + 10 digits

(50/60Hz)

600V 1V

DC Current

(A DC)

200mA 0.1mA

±(1.2% reading + 2 digits)

10A 10mA

±(2.0% reading + 2 digits)

Resistance

200Ω0.1Ω

±(0.8% reading + 2 digits)

2000Ω1Ω

20kΩ0.01kΩ

200kΩ0.1kΩ

20MΩ10kΩ±(1.5% reading + 2 digits)

Battery Test 9V 10mV

±(1.0% reading + 2 digits)

1.5V 1mV

Temperature -20°C to 750°C 1°C

±(3% of reading +5°C/9°F)

-4°F to 1400°F 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.

Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less than 75% RH.

MN15A V1.1 02/09

General Specifications

Diode Test Bias voltage: 2.8VDC typical

Continuity Check Audible signal will sound if the resistance is less than 100Ω

Input Impedance 1MΩ(VDC & VAC)

AC Bandwidth 50 / 60Hz

Display 2000 count (0 to 1999) LCD

Overrange indication “1___” is displayed

Polarity Automatic (no indication for positive); Minus (-) sign for

negative

Measurement Rate 2 times per second, nominal

Low Battery Indication “ ” is displayed

Battery One (1) 9V battery (NEDA 1604)

Fuses mA range; 200mA/250V ceramic fast blow

A range; 10A/250V ceramic fast blow

Operating Temperature 32ºF to 122ºF (0ºC to 50ºC)

Storage Temperature -4oF to 140oF (-20oC to 60oC)

Operating Humidity Max 70% up to 87ºF (31ºC) decreasing linearly to 50% at

122ºF (50ºC)

Storage Humidity < 80% RH

Operating Altitude 7000 ft. (2000 meters) maximum.

Weight 9.17 oz (255g)

Size 5.2” x 2.6” x 1.5” (132 x 66 x 38mm)

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 2nd Edition (2001) to CAT III 600V; Pollution Degree 2. The

meter also meets UL 61010-1, Second Edition (2004),

CAN/CSA C22.2 No. 61010-1, Second Edition (2004), and UL

61010B-2-031, First Edition (2003)

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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