Extech Instruments 411 User manual

User's Guide

True RMS Multimeter

Extech 411

EX411-en-GB_v4.3 4/15

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

EX411-en-GB_v4.3 4/15

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.

EX411-en-GB_v4.3 4/15

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 750V DC/AC

V DC or V AC 1000V 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.

EX411-en-GB_v4.3 4/15

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

EX411-en-GB_v4.3 4/15

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.

EX411-en-GB_v4.3 4/15

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.

EX411-en-GB_v4.3 4/15

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.

EX411-en-GB_v4.3 4/15

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.

EX411-en-GB_v4.3 4/15

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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