Extech Instruments 411 User manual

User's Guide

True RMS Multimeter

Extech 411

V4.0 5/072

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

This symbol adjacent to another symbol,

terminal or operating device indicates that the

operator must refer to an explanation in the

Operating Instructions to avoid personal injury

or damage to the meter.

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.

This symbol adjacent to one or more terminals

identifies them as being associated with

ranges that may, in normal use, be subjected

to particularly hazardous voltages. For

maximum safety, the meter and its test leads

should not be handled when these terminals

are energized.

This symbol indicates that a device is

protected throughout by double insulation or

reinforced insulation.

WARNING

CAUTION

MAX

1000V

V4.0 5/073

OVERVOLTAGE CATEGORY III

This meter meets the IEC 610-1-95 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.

V4.0 5/074

Controls and Jacks

1. Rubber holster

2. 2000 count LCD display

3. Degrees F button

4. Degrees 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) Ω Ohms

A Amps V Volts

AC Alternating current AUTO Autoranging

DC Direct current HOLD Display hold

ºF Degrees Fahrenheit ºC Degrees Centigrade

V4.0 5/075

Specifications

Function Range

Resolution Accuracy

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

2V 0.001V

200V 0.1V ±(0.5% reading + 2 digits)

DC Voltage

(V DC)

1000V 1V ±(0.8% reading + 2 digits)

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

AC Voltage

(V AC)

(True rms)

750V 1V ±(2.0% reading

+6 digits

±(3.0% reading

+8 digits

200µA 0.1µA

200mA 0.1mA ±(1.5% reading + 3 digits)

DC Current

(A DC)

20A 0.01A

±(2.5% reading + 3 digits)

50 to 400Hz 400Hz to 1kHz

200mA 0.1mA ±(1.8% reading

+8 digits

±(2.5% reading

+10 digits)

AC Current

(A AC)

(True rms)

20A 0.01A

±(3.0% reading

+8 digits)

±(3.5% reading

+10 digits)

200Ω0.1Ω±(0.8% reading +4 digits)

2000Ω1Ω±(0.8% reading +2 digits)

20kΩ0.01kΩ

200kΩ0.1kΩ±(1.0% reading +2 digits)

Resistance

20MΩ0.01MΩ±(2.0% reading +5 digits)

-4 to

1382ºF

1ºFTemperature

-20 to

750ºC

1ºC

±(3.0% reading +3 digits)

(meter only, probe accuracy not

included)

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 65oF to 83oF (18oC to 28oC) and less

than 75% RH.

V4.0 5/076

Specifications

Diode Test Test current of 1mA maximum, open

circuit voltage 2.8V DC typical

Continuity Check Audible signal will sound if the

resistance is less than approximately

150Ω

Input Impedance 10MΩ

AC Response True rms

ACV Bandwidth 50Hz to 1kHz

DCA voltage drop 200mV

Display 3 ½ digit, 2000 count LCD, 0.9” digits

Auto-Power Off 15 minutes (approximately)

Overrange indication “1” is displayed

Polarity Automatic (no indication for positive

polarity); Minus (-) sign for negative

polarity.

Measurement Rate 2 times per second, nominal

Low Battery Indication “ ” is displayed if battery voltage

drops below operating voltage

Battery One 9 volt (NEDA 1604) battery

Fuses mA, µA ranges; 0.2A/250V fast blow

A range; 20A/250V ceramic fast blow

Operating Temperature 41ºF to 104ºF (5ºC to 40ºC)

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

Operating Humidity Max 80% up to 87ºF (31ºC)

decreasing linearly to 50% at

104ºF(40ºC)

Storage Humidity <80%

Operating Altitude 7000ft. (2000meters) maximum.

Weight 0.753lb (342g) (includes holster).

Size 7.36” x 3.2” x 2.0” (187 x 81 x 50mm)

(includes holster)

Safety For indoor use and in accordance with

the requirements for double insulation to

IEC1010-1 (1995): EN61010-1 (1995)

Overvoltage Category III 600V and

Category II 1000V, Pollution Degree 2.

V4.0 5/077

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.

V4.0 5/078

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.

V4.0 5/079

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.

V4.0 5/0710

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.

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