Extech Instruments MN26 Manuale utente

User’s Manual

MiniTecTM Series

Model MN26

(Model MN26T includes temperature probe)

Mini Autoranging MultiMeter

MN26T V4.0 05/05

Introduction

Congratulations on your purchase of Extech’s MN26 Autoranging Multimeter. 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.

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the user must

refer to the manual for further information.

This symbol, adjacent to a terminal, indicates that, under normal use,

hazardous voltages may be present

Double insulation

Safety Precautions

1. Improper use of this meter can cause damage, shock, injury or death. Read and

understand this user manual before operating the meter.

2. Make sure any covers or battery doors are properly closed and secured.

3. Always remove the test leads before replacing the battery or fuses.

4. Inspect the condition of the test leads and the meter itself for any damage before

operating the meter. Repair any damage before use.

5. Do not exceed the maximum rated input limits.

6. Use great care when making measurements if the voltages are greater than 25VAC

rms or 35VDC. These voltages are considered a shock hazard.

7. Always discharge capacitors and remove power from the device under test before

performing Capacitance, Diode, Resistance or Continuity tests.

8. Remove the battery from the meter if the meter is to be stored for long periods.

9. To avoid electric shock, do not measure AC current on any circuit whose voltage

exceeds 250V AC.

10. Voltage checks on electrical outlets can be difficult and misleading because of the

uncertainty of connection to the electrical contacts. Other means should be used to

ensure that the terminals are not "live".

Specifications

Function Range Resolution Accuracy

400mV 0.1mV ±(0.5% reading + 2 digits)

4V 0.001V

40V 0.01V

400V 0.1V

±(1.0% reading + 2 digits)

DC Voltage

(V DC)

600V 1V ±(1.5% reading + 2 digits)

400mV 0.1mV ±(2.0% reading + 30 digits)

4V 0.001V

40V 0.01V

400V 0.1V

±(1.5% reading + 3 digits)

AC Voltage

(V AC)

(40 - 400Hz)

(40 - 200Hz for

400mV, 4V ranges) 600V 1V ±(2.0% reading + 4 digits)

400µA 0.1µA

4000µA 1µA

40mA 0.01mA

400mA 0.1mA

±(1.5% reading + 3 digits)

DC Current

(A DC)

10A 0.01A

±(2.5% reading + 5 digits)

MN26T V4.0 05/05

Function Range Resolution Accuracy

400µA 0.1µA

4000µA 1µA

40mA 0.01mA

400mA 0.1mA

±(1.8% reading + 5 digits)

AC Current

(A AC)

(40 - 400Hz)

(40 - 200Hz for

400µA, 4mA

ranges) 10A 0.01A

±(3.0% reading + 7 digits)

400Ω0.1Ω±(1.2% reading + 4 digits)

4kΩ0.001kΩ

40kΩ0.01kΩ

400kΩ0.1kΩ

4MΩ0.001MΩ

±(1.2% reading + 2 digits)

Resistance

40MΩ0.01MΩ±(2.0% reading + 3 digits)

4nF 0.001nF

±(5.0% reading + 10digits)

40nF 0.01nF

±(5.0% reading + 7 digits)

400nF 0.1nF

4µF 0.001µF

40µF 0.01µF

±(3.5% reading + 5 digits)

Capacitance

200µF 0.1µF ±(5.0% reading + 5 digits)

9.999Hz 0.001Hz

99.99Hz 0.01Hz ±(1.5% reading + 5 digits)

999.9Hz 0.1Hz

9.999kHz 0.001kHz

99.99kHz 0.01kHz

999.9kHz 0.1kHz

±(1.2% reading + 2 digits)

9.999MHz 0.001MHz ±(1.5% reading + 4 digits)

Frequency

Sensitivity: 0.8V rms min. @ 20% to 80% duty cycle and <100kHz;

5Vrms min @ 20% to 80% duty cycle and > 100kHz.

Duty Cycle 0.1 to 99.9% 0.1% ±(1.2% reading + 2 digits)

Pulse width: 100µs - 100ms

Temp °F -4 to 1400°F* 1°F

Temp °C -20 to 760°C* 1°C ±(3.0% reading + 3 digits)

(probe effect additional)

NOTE: Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less than 70% RH.

NOTE: Temperature range of the temperature probe may be less than the range of the

meter.

Input Limits

Function Maximum Input

V DC, VAC 600V DC/AC

Ohms, Capacitance, Diode, Frequency,

Continuity 250V DC/AC

mA DC/AC 400mA DC/AC

10A DC/AC 10A DC/AC (30sec. max)

MN26T V4.0 05/05

Diode Test Test current of 0.3mA maximum, open circuit voltage 1.5V DC

typical

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

approximately 30Ω, test current <0.7mA

Input Impedance 7.5MΩ(VDC and VAC)

Display 4000 count LCD

Overrange indication “OL” is displayed

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

negative polarity.

Measurement Rate 2 times per second, nominal

Auto Power Off Meter automatically shuts down after 15 minutes of inactivity

Low Battery Indication “BAT” is displayed

Batteries Requires two AAA batteries

Fuses mA, µA ranges, 0.5A/250V fast blow

10A range, 10A/250V fast blow

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

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

Relative Humidity <70% operating, <80% storage

Operating Altitude 7000ft (2000 meters) maximum.

Weight 9.17 oz. (260g).

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

Meter Description

1. LCD Display

2. Function switch

3. Function key

4. Range key

5. Temperature jack

6. COM jack

7. 10A jack

8. Positive jack

9. Relative key

10. Data Hold key

Note: Tilt stand, fuse and battery compartment are on rear of unit.

MN26T V4.0 05/05

Symbols

AC (alternating current or

voltage)

DC (direct current or voltage)

•))) Continuity

Diode test

mV, V millivolt, volt (voltage)

Ω, kΩ, MΩ ohm, kilohm, megohm

(resistance)

uA, mA, A microamp, milliamp, Amp

(current)

pF, nF, uF picofarad, nanofarad,

microfarad (capacitance)

Hz kHz hertz, kilohertz (frequency)

% % duty cycle

OF, OC Degrees Fahrenheit,

Centigrade (temperature)

AUTO Autorange

BAT Low battery

HOLD Display hold

REL Relative

Operating Instructions

AC or DC Voltage Measurements

1. Insert the black test lead banana plug into the negative COM jack and the red test

lead banana plug into the positive Vjack.

2. Turn the rotary switch to the VAC or VDC position.

3. Touch the test probes to the circuit under test and read the voltage on the display.

AC or DC Current Measurements

CAUTION: Do not make current measurements on the 10A scale for longer than 30

seconds followed by a 15 minute cool down period. 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 and the red test

lead banana plug into the;

a. Positive uA/mA jack for currents to 400mA

b. Positive 10A jack for currents to 10A

2. Turn the rotary switch to the uA, mA or Aposition.

3. Touch the test probes in series with the circuit under test and read the current on the

display.

Resistance Measurements

1. Insert the black test lead banana plug into the negative COM jack and the red test

lead banana plug into the positive Ωjack.

2. Turn the rotary switch to the Ωposition.

3. Touch the test probes to the circuit or device under test and read the resistance on

the display.

MN26T V4.0 05/05

Capacitance Measurements

1. Insert the black test lead banana plug into the negative COM jack and the red test

lead banana plug into the positive CAP jack.

2. Turn the rotary switch to the CAP position.

3. Touch the test probes to the circuit or device under test and read the capacitance on

the display.

Frequency or Duty Cycle Measurements

1. Insert the black test lead banana plug into the negative COM jack and the red test

lead banana plug into the positive HZ jack.

2. Turn the rotary switch to the Hz/% position.

3. Press the Hz/% key to select “Hz” or “%”.

4. Touch the test probes to the circuit or under test and read the frequency or duty cycle

on the display.

Temperature Measurements

WARNING: To avoid electric shock, disconnect test leads from any source of voltage

before making a temperature measurement. Be sure that the thermocouple has been

removed before changing to any other measurement function.

WARNING: To avoid electric shock, do not probe live circuits with the thermocouple

probe..

1. Insert the type K thermocouple probe into the sub-miniature temperature socket.

(see separate instruction sheet at the end of this manual)

2. Turn the rotary switch to the oCor oFposition.

3. Read the temperature on the display.

Note: Although the meter specifies the temperature range to be -4 to 1400oF (-20 to 760oC)

the supplied thermocouple’s (Part No. TP870) temperature range is -40 to 482oF (-4- to

250oC).

Continuity Measurements

1. Insert the black test lead banana plug into the negative COM jack and the red test

lead banana plug into the positive Ωjack. Observe polarity.

2. Turn the rotary switch to the •))) position.

3. Press the •))) key to select continuity.

4. Touch the test probes to the circuit or device under test. If the resistance is less than

approximately 30Ωthe buzzer will sound and the resistance appears on the display.

Diode Measurements

1. Insert the black test lead banana plug into the negative COM jack and the red test

lead banana plug into the positive diode jack.

2. Turn the rotary switch to the •))) position.

3. Press the •))) key to select diode.

4. Touch the test probes to the diode under test. Forward voltage will indicate 0.4V to

0.7V. Reverse voltage will indicate “OL”. Shorted devices will indicate near 0mV and

an open device will indicate “OL” in both polarities.

MN26T V4.0 05/05

Manual Ranging

The meter powers on in the autoranging mode. Press the Range key to go to manual

ranging. Each press of the range key will step to the next range as indicated by the units

and decimal point location. Press and hold the Range key for one second to return to

autoranging.

Data Hold

Press the Data Hold key to freeze the reading in the display. “HOLD” will appear in the

LCD. Press the key again to release the display.

Relative Measurements

The relative measurement feature allows you to make measurements relative to a stored

reference value. A reference voltage, current, etc. can be stored and measurements made

in comparison to that value. The displayed value is the difference between the reference

value and the measured value.

1. Perform any measurement as described in the operating instructions.

2. Press the Relative button to store the reading in the display and the "REL" indicator

will appear on the display.

3. The display will now indicate the difference between the stored value and the

measured value.

4. Press the Relative button to return to normal operation.

Auto Off

The auto off feature will turn the meter off after 15 minutes of inactivity (Range switch or a

key has not been turned or pressed). A beep will warn the user shortly before the auto off

feature activates.

MN26T V4.0 05/05

Maintenance

WARNING: To avoid electric shock, disconnect the test leads from any source of voltage

before removing the battery/fuse cover.

WARNING: To avoid electric shock, do not operate your meter until the battery/fuse

cover is 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.

2. Use and store the meter in mild ambient conditions. Temperature extremes can

shorten the life of the electronic parts and distort or melt plastic parts.

3. Handle the meter gently. 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 batteries should be removed

to prevent damage to the unit.

Battery Replacement

WARNING: To avoid electric shock, disconnect the test leads from any source of

voltage before removing the battery/fuse cover.

1. Disconnect the test leads from the meter.

2. Remove the rubber holster (if in place).

3. Open the battery door by removing the screw using a Phillips

head screwdriver.

4. Insert the new batteries into the battery holder, observing the

correct polarity.

5. Replace the battery door and secure with the screw.

Fuse Replacement

WARNING: To avoid electric shock, disconnect the test leads from any source of

voltage before removing battery/fuse cover.

1. Disconnect the test leads from any circuit being measured.

2. Remove the rubber holster (if in place).

3. Open the fuse cover by removing the screw on the rear cover using a Phillips

screwdriver.

4. Remove the rear cover.

5. Remove the old fuse by gently pulling up on it.

6. Install the new fuse by gently pushing it into the holder.

7. Always use a fuse of the proper size and value (0.5A/250V fast blow, or 10A/250V

fast blow).

8. Replace the fuse door and secure with the screw.

A UL mark does not indicate that this product has been evaluated for the accuracy of its

readings.

MN26T V4.0 05/05



Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

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.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer service

for details on services available. Extech recommends that calibration be performed on an

annual basis to insure calibration integrity.

in whole or in part in any form.

Instruction Sheet

Model TP870

Type K Bead Wire Thermocouple Probe

WARNING: To avoid electric shock, do not probe into or near live electrical circuits with the

thermocouple probe..

Sensor Type Type K thermocouple (Chromel – Alumnel)

Temperature range -40 to 482oF (-40 to 250oC)

Lead length 39” (1m)

Connector subminiature

Note: This probe is not UL listed

more infor for Extech MN26T

Phone: 01235 838 555

Email: cs@airconcern.co.uk

Web. www.airconcern.co.uk

Air Concern Ltd, Building 173 Curie Avenue Harvell Didcot, Oxfordshire

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