Extech Instruments MN25 User manual

User's Guide

MiniTecTM Series

Model MN25 MultiMeter

MN25 Version 2.2 Aug 2003

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be

free of defects in parts and workmanship for one year from date of shipment

(a six month limited warranty applies on sensors and cables). If it should

become necessary to return the instrument for service during or beyond the

warranty period, contact the Customer Service Department at (781) 890-

7440 ext. 210 for authorization or visit our website at www.extech.com (click

on ‘Contact Extech’ and go to ‘Service Department’ to request an RA

number). A Return Authorization (RA) number must be issued before any

product is returned to Extech. The sender is responsible for shipping

charges, freight, insurance and proper packaging to prevent damage in

transit. This warranty does not apply to defects resulting from action of the

user such as misuse, improper wiring, operation outside of specification,

improper maintenance or repair, or unauthorized modification. 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.

Introduction

Congratulations on your purchase of Extech’s MN25Multimeter.

This meter measures AC/DC Voltage, AC/DC Current,

Resistance, Capacitance, Frequency, Duty Cycle, Temperature,

Diode Test and Continuity. Proper use and care of this meter will

provide many years of reliable service.

MN25 Version 2.2 Aug 2003

Safety

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 Limits

Function Maximum Input

V DC, V AC 600V DC/AC, 200Vrms on 200mV range

mA DC 200mA 250V fast acting fuse

A DC, A AC 10A 250V fast acting fuse(30 seconds

max every 15 minutes)

Resistance,

Continuity

250Vrms for 15sec max

2. USE EXTREME CAUTION when working with high

voltages.

3. DO NOT measure voltage if the voltage on the "COM"

input jack exceeds 500V 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 the power and disconnect the test leads

before opening the doors to replace the fuse or batteries.

MN25 Version 2.2 Aug 2003

Safety Symbols

NEVER operate the meter unless the back

cover and the battery and fuse doors are in

place and fastened securely. 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 (in this case)

500 VAC or VDC.

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.

WARNING

CAUTION

MAX

500V

MN25 Version 2.2 Aug 2003

Specifications

Function Range Resolution Accuracy

200mV 0.1mV

2000mV 1mV

20V 0.01V

200V 0.1V

DC Voltage

(V DC)

600V 1V

±(0.5% reading + 2

digits)

200V 0.1VAC Voltage

(V AC) 600V 1V

±(1.5% reading + 5 digits

(Frequency 50/60Hz)

200mA 100µA ±(1.2% reading + 2

digits)

DC Current

(A DC)

10A 10mA

±(2.0% reading + 2

digits)

200mA 100µA ±(1.8% reading + 5

digits)

AC Current

(A AC)

10A 10mA

±(3.0% reading + 5

digits)

200Ω0.1Ω

2000Ω1Ω

20kΩ0.01kΩ

200kΩ0.1kΩ

±(0.8% reading + 2

digits)

Resistance

2000kΩ1kΩ±(1.0% reading + 2

digits)

9V 10mVBattery Test

1.5V 10mV

±(1.0% reading + 2

digits)

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.

NOTE: Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less

than 75% RH.

MN25 Version 2.2 Aug 2003

Display 3 ½ digit, 2000 count LCD, 0.5” digits

Overrange indication “1” is displayed

Diode Test Test current of 1mA maximum, open

circuit voltage 2.8V DC typical

Continuity Check Audible signal will sound if the

resistance is less than approximately

30Ω

Battery Test current 9V (6mA); 1.5V (100mA)

Input Impedance >1MΩ

ACV Bandwidth 45Hz to 450Hz

DCA voltage drop 200mV

Polarity Automatic (no indication for positive

polarity); Minus (-) sign for negative

polarity.

Measurement Rate 2 times per second, nominal

Low Battery Indication ‘BAT’ is displayed if battery voltage

drops below operating voltage

Battery 9 Volt Battery

Fuses mA, µA ranges; 0.2A/250V fast blow

A range; 10A/250V fast blow

Operating Temperature 41ºF to 104ºF (5ºC to 40ºC)

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

Operating Humidity Max 80% up to 87ºF (31ºC) decreasing

linearly to 50% at 104ºF (40ºC)

Storage Humidity < 80%

Operating Altitude 7000ft. (2000) meters maximum.

Weight 9.17 oz. (260g).

Size 4.78 x 2.38 x 1.57” (121.5 x 60.6 x

40mm)

Safety For indoor use and in accordance with

Overvoltage Category II, Pollution

Degree 2. Category II includes local

level, appliance, portable equipment,

etc., with transient overvoltages less

than Overvoltage Category III.

MN25 Version 2.2 Aug 2003

Meter Description

1. LCD Display

2. Function switch

3. 10A jack

4. COM jack

5. Positive jack

Note: Tilt stand, fuse and battery

compartment are on rear of unit.

LCD Display Indicators

•))) Continuity

Diode test

m milli ( volts, amps)

k kilo (ohms)

Ω ohms

V DC volts direct current

V AC volts alternating current

A DC amps direct current

A AC amps alternating current

BAT Low battery and battery test

3 4 5

MN25 Version 2.2 Aug 2003

Operation

WARNING: Risk of electrocution. High-voltage circuits, both AC

and DC, are very dangerous and should be measured with great

care.

1. ALWAYS turn the function switch to the OFF position when

the meter is not in use.

2. If “OL” appears in the display during a measurement, the

value exceeds the range you have selected. Change to a

higher range.

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.

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 VDC

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. Reset the function switch to

successively lower VDC positions to obtain a higher

resolution reading. The display will indicate the proper

decimal point and value. If the polarity is reversed, the

display will show (-) minus before the value.

MN25 Version 2.2 Aug 2003

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 highest 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

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. Reset the function switch to

successively lower VAC positions to obtain a higher

resolution reading. The display will indicate the proper

decimal point and value.

MN25 Version 2.2 Aug 2003

DC Current Measurements

CAUTION: Do not make current measurements on the 10A

scale 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 DC, set the function switch to

the 200m ADC position and insert the

red test lead banana plug into the

(mA) jack.

3. For current measurements up to 10A

DC, set the function switch to the

10A range 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. The display will indicate the

proper decimal point and value.

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