Extech Instruments MN26-NIST User manual

User’s Manual

MiniTecTM Series

Model MN26

Mini Autoranging

MultiMeter

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)

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.

Function Range Resolution Accuracy

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 % not included)

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)

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

70% RH.

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

Temperature sensor Requires type K thermocouple

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 if battery voltage drops

below operating voltage

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.

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.

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.

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

temperature socket.

2. Turn the rotary switch to the oCor oFposition.

3. Read the temperature on the display.

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.

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.

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