Extech Instruments 411 User manual

User's Guide

True RMS Multimeter

Extech 411

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Extech EX 411 Professional Multimeter

Extech EX411-NIST True RMS Professional MultiMeter

EX411-EU_ENG V4.0 5/07

Introduction

Congratulations on your purchase of the Extech 411 (part number EX411) True RMS

Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Diode Test,

and Continuity plus Thermocouple Temperature. 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

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) 1000 VAC or VDC.

WARNING

CAUTION

MAX

1000V

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EX411-EU_ENG V4.0 5/07

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.

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 the children could swallow. In case a child

swallows any of them, please contact a physician immediately

Do not leave batteries and packing material lying around unattended; they can be

dangerous for children if they use them as toys

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

batteries to prevent them from training

Expired or damaged batteries can cause cauterization on contact with the skin.

Always, therefore, use suitable hand gloves in such cases

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

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EX411-EU_ENG V4.0 5/07

OVERVOLTAGE CATEGORY III

This meter meets the IEC 610-1-2001 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

VAC

0V DC/AC

V DC or V AC

00V DC/AC, 200Vrms on 200mV range

mA DC 200mA 250V fast acting fuse

A DC 20A 250V 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 1000V 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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EX411-EU_ENG V4.0 5/07

Controls and Jacks

1. Rubber holster

2. 2000 count LCD display

3. °F button

4. °C button

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

11. Backlight button

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

Symbols and Annunciators

•))) Continuity

Diode test

Battery status

Test lead connection

error

µ micro (10-6) (amps)

m milli (10-3) (volts, amps)

k kilo (103) (ohms)

M mega (106) (ohms)  Ohms

A Amps V Volts

AC Alternating current AUTO Autoranging

DC Direct current HOLD Display hold

ºF Degrees Fahrenheit ºC Degrees Centigrade

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EX411-EU_ENG V4.0 5/07

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 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. 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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EX411-EU_ENG V4.0 5/07

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 Vjack.

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 20A 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 20A DC, set the

function switch to the 20A DC range and insert the red

test lead banana plug into the 20A 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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EX411-EU_ENG V4.0 5/07

AC CURRENT MEASUREMENTS

CAUTION: Do not make current measurements on the 20A 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 20A AC, set the

function switch to the 20A AC range and insert the red

test lead banana plug into the 20A 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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EX411-EU_ENG V4.0 5/07

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.

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EX411-EU_ENG V4.0 5/07

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.

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 20A 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.

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