Extech Instruments EX410A User manual

USER MANUAL

Digital Multimeter

MODEL EX410A

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Introduction

Congratulations on your purchase of the Extech EX410A Multimeter. This meter measures AC/DC

Voltage, AC/DC Current, Resistance, Diode Test, and Continuity plus Thermocouple Temperature. 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 of this User Guide, Product

Updates, additional user manual languages, and Customer Support.

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

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) 600 VAC or VDC.

WARNING

CAUTION

MAX

600V

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CAUTIONS

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

this user manual before operating the meter.

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

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

meter. Repair or replace any damage before use.

Use great care when making measurements if the voltages are greater than 25VAC rms or

35VDC. These voltages are considered a shock hazard.

Warning! This is a class A equipment. This equipment can cause interference to devices in the

home; in this case the operator can be required to carry out adequate measures to prevent

interference.

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

Diode, Resistance or Continuity tests.

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

of connection to the recessed electrical contacts. Other means should be used to ensure that

the terminals are not "live".

If the equipment is used in a manner not specified by the manufacturer, the protection provided

by the equipment may be impaired.

This device is not a toy and must not reach children s hands. It contains hazardous objects as

well as small parts that children could swallow. In case a child swallows any of the parts,

please contact a physician immediately.

Do not leave batteries and packing material unattended; they can be dangerous for children.

In case the device is going to be unused for an extended period of time, remove the batteries

to prevent them from draining.

Expired or damaged batteries can cause cauterization on contact with skin. Always use

suitable hand protection.

See that the batteries are not short-circuited. Do not throw batteries into fire.

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OVERVOLTAGE CATEGORY III

This meter meets the IEC 61010-1 (2010) 3rd edition standard for OVERVOLTAGE CATEGORY III.

Cat III meters are protected against overvoltage transients in fixed installation at the distribution

level. Examples include switches in the fixed installation and some equipment for industrial use with

permanent connection to the fixed installation.

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

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

mA DC 200mA 600V fast acting fuse

A DC 10A 600V fast acting fuse (30 seconds max every 15 minutes)

Ohms, 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 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 the power and disconnect the test leads before opening the covers to replace

the fuse or battery.

7. NEVER operate the meter unless the back cover and the battery cover is in place and fastened

securely.

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Description

1. Rubber holster (must be removed to access battery)

2. 2000 count LCD display

3. °F button for temperature measurements

4. °C button for temperature measurements

5. Function switch

6. mA, uA and A input jacks

7. COM input jack

8. Positive input jack

9. Battery check button

10. Hold button (freezes displayed reading)

11. LCD backlight button

Note: Tilt stand, test lead holders, and battery compartment are on rear of unit.

Symbols and Annunciators

))) Continuity

Diode test

Battery status

Test lead connection error

HOLD Display hold

ºF Degrees Fahrenheit

ºC Degrees Celsius

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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.

1. ALWAYS turn the function switch to the OFF position when the meter is not in use.

2. If 1 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 V DC ( ) 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 V DC positions to obtain a higher resolution reading. If the polarity is

reversed, the display will show (-) minus before the value.

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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 V AC ( ) 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.

Touch the red test probe tip to the hot side of the circuit.

4. Read the voltage in the display. Reset the function switch to successively

lower V AC positions to obtain a higher resolution reading.

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 200µA DC, set the function switch to the

200µA DC ( ) position and insert the red test lead banana plug into the

uA/mA jack.

3. For current measurements up to 200mA DC, set the function switch to the

200mA DC position and insert the red test lead banana plug into the

uA/(mA jack.

4. For current measurements up to 10A DC, set the function switch to the

10A DC range and insert the red test lead banana plug into the 10A jack.

5. Remove power from the circuit under test, then open up the circuit at the

point where you wish to measure current.

6. 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.

7. Apply power to the circuit.

8. Read the current in the display.

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AC 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 AC, set the function switch to the

highest 200mA AC ( ) position and insert the red test lead banana plug

into the mA jack.

3. For current measurements up to 10A AC, set the function switch to the

10A AC 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 neutral side of the circuit.

Touch the red test probe tip to the hot side of the circuit.

6. Apply power to the circuit.

7. Read the current in the display.

RESISTANCE MEASUREMENTS

WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all

capacitors before taking any resistance measurements. Remove the battery and unplug the line

cords.

1. Set the function switch to the highest 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 probe tips across the circuit or part under test. It is best

to disconnect one side of the part under test so the rest of the circuit

will not interfere with the resistance reading.

4. Read the resistance in the display and then set the function switch to

the lowest position that is greater than the actual or any anticipated

resistance.

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CONTINUITY CHECK

WARNING: To avoid electric shock, never measure continuity on circuits or wires that have voltage

on them.

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 jack.

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

4. If the resistance is less than approximately 150 , the audible signal will

sound. If the circuit is open, the display will indicate 1 .

DIODE TEST

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. Touch the test probes to the diode under test. Forward bias will typically

indicate 400 to 1000. Reverse bias will indicate 1 . Shorted devices will

indicate near 0 and the continuity beeper will sound. An open device will

indicate 1 in both polarities.

TEMPERATURE MEASUREMENTS

1. Set the function switch to the TEMP position.

2. Insert the Temperature Probe into the Temperature Socket, making sure to

observe the correct polarity.

3. Press the ºC or ºF button for the desired units.

4. Touch the Temperature Probe head to the part whose temperature you

wish to measure. Keep the probe touching the part under test until the

reading stabilizes.

5. 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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DISPLAY BACKLIGHT

Press and hold the button to turn on the display backlight function. The backlight will automatically turn off after

15 seconds.

BATTERY CHECK

The CHECK function tests the condition of the 9V battery. Set the function switch to the 200VDC range and

press the CHECK button. If the reading is less than 8.5, battery replacement is recommended.

HOLD

The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or to exit the

hold function.

AUTO POWER OFF

The auto off feature will turn the meter off after 15 minutes.

LOW BATTERY INDICATION

If the icon appears in the display, the battery voltage is low and the battery should be replaced.

WRONG CONNECTION INDICATION

The icon will appear in the upper right conner of the display and the buzzer will sound whenever the positive

test lead is inserted into the 10A or uA/mA input jack and a non-current (green) function is selected. If this occurs,

turn the meter off and reinsert the test lead into the proper input jack for the function selected.

Specifications

Function Range Resolution Accuracy

DC Voltage

(V DC)

200mV 0.1mV (0.3% reading + 2 digits)

2V 0.001V (0.5% reading + 2 digits)

200V 0.1V

600V 1V (0.8% reading + 2 digits)

AC Voltage

(V AC)

50 to 400Hz 400Hz to 1kHz

2V 0.001V (1.0% reading +6 digits (2.0% reading + 8 digits

200V 0.1V (1.5% reading +6 digits (2.5% reading +8 digits

600V 1V (2.0% reading +6 digits (3.0% reading +8 digits

DC Current

(A DC)

200 A 0.1 A (1.5% reading + 3 digits)

200mA 0.1mA

10A 0.01A (2.5% reading + 3 digits)

AC Current

(A AC)

50 to 400Hz 400Hz to 1kHz

200mA 0.1mA (1.8% reading +8 digits (2.5% reading +10 digits)

10A 0.01A (3.0% reading +8 digits) (3.5% reading +10 digits)

Resistance 200 0.1 (0.8% reading +4 digits)

2000 1 (0.8% reading +2 digits)

20k 0.01k (1.0% reading +2 digits)

200k 0.1k

20M 0.01M (2.0% reading +5 digits)

Temperature -20 to 750ºC 1ºC (3.0% reading +3 digits)

(meter only, probe accuracy not included)

-4 to 1382ºF 1ºF

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

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