Extech Instruments EX205T Manual de usuario

User Guide

True RMS Multimeter

Extech EX205T

EX205T-EU-EN V1.0 8/12

Introduction

Thank you for selecting the Extech EX205T True RMS Auto-ranging Multimeter. This meter measures

AC/DC Voltage, AC/DC Current, Resistance, Diode Test, and Continuity. Proper use and care of this

meter will provide many years of reliable service. Please visit the Extech Instruments website

(www.extech.com) to check for the latest version of this User Guide. Extech Instruments is an ISO-

9001 certified company.

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) 600 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.

PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY

OVERVOLTAGE CATEGORY I

Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which

measures are taken to limit the transient overvoltages to an appropriate low level.

Note – Examples include protected electronic circuits.

OVERVOLTAGE CATEGORY II

Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from

the fixed installation.

Note – Examples include household, office, and laboratory appliances.

OVERVOLTAGE CATEGORY III

Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.

Note – Examples include switches in the fixed installation and some equipment for industrial use

with permanent connection to the fixed installation.

OVERVOLTAGE CATEGORY IV

Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.

Note – Examples include electricity meters and primary over-current protection equipment

WARNING

CAUTION

MAX

600V

EX205T-EU-EN V1.0 8/12

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.

Use great care when making measurements if the voltages are greater than 25 VAC rms or 35

VDC. These voltages are considered a shock hazard.

Warning! This is a Class A device. This device can cause interference in residential areas.

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 must not be used by children. It contains hazardous objects as well as small parts

that the children could swallow.

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

to children.

In the event that this device will be stored for an extended period of time, remove the batteries.

Expired or damaged batteries can be hazardous to skin. Use suitable hand gloves in such

cases.

Do not short-circuit the battery.

Never dispose of batteries in a fire. Batteries may explode or leak.

Never mix battery types. Always install new batteries of the same type.

EX205T-EU-EN V1.0 8/12

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 AC/DC, Resistance, Diode Test, Continuity 600 VDC/AC rms

μA or mA AC/DC 200mA fused

A AC/DC 10A fused

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 batteries.

7. NEVER operate the meter unless the back cover and the battery and fuse covers are in place

and fastened securely.

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

by the equipment may be impaired.

EX205T-EU-EN V1.0 8/12

Controls and Jacks

1. 2000 count LCD

2. MAX button

3. MODE button

4. FUNCTION switch

5. mA, µA and 10A input jacks

6. Backlight button

7. HOLD button

8. RANGE button

9. Positive input jack

10. COM input jack

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

Symbols and Enunciators

Continuity

Diode test

µ micro (10-6) (amps)

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

A Amps

k kilo (103) (ohms)

M mega (106) (ohms)

 Ohms

V Volts

AC Alternating current

DC Direct current

MAX Maximum

AUTO Auto-ranging

HOLD Display hold

EX205T-EU-EN V1.0 8/12

Operating Instructions

WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are extremely 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 “OL” appears in the display during a measurement, the value exceeds the range you have

selected. Change to a higher range.

AC/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. Rotate the function switch to the VAC or VDC 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.

AC/DC CURRENT MEASUREMENTS

1. Insert the black test lead banana plug into the negative COM jack.

2. Press the MODE button to indicate “DC” or “AC” on the display.

3. For current measurements up to 2000µA, set the function switch to the µA position

and insert the red test lead banana plug into the µA/mA jack.

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

position and insert the red test lead banana plug into the µA/mA jack.

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

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

6. Connect the test leads in series with the circuit under test.

7. Apply power to the circuit.

8. Read the current in the display.

EX205T-EU-EN V1.0 8/12

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 batteries and unplug the line

cords.

1. Rotate the function switch to the Ωposition.

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 device under test.

4. Read the resistance in the display.

CONTINUITY CHECK

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

voltage potential.

1. Rotate 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. Press the MODE button to indicate“ " on the display

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

5. If the resistance is less than the continuity threshold, the audible signal will sound.

DIODE TEST

1. Rotate the function switch to the green position.

2. Insert the black test lead banana plug into the negative COM jack and the red test

lead banana plug into the positive jack.

3. Press the MODE button to indicate “ “and “V” on the display.

4. Touch the test probes to the diode under test. Forward voltage will typically indicate

0.400 to 0.700V. Reverse voltage will indicate “OL”. Shorted devices will indicate

near 0V and an open device will indicate “OL” in both polarities.

EX205T-EU-EN V1.0 8/12

AUTORANGING/MANUAL RANGE SELECTION

When the meter is first switched on, it automatically enters the Auto-Ranging mode. This

automatically selects the best range for the measurements being made and is generally the best

mode for most measurements. For measurement situations requiring that a range be manually

selected, perform the following:

1. Press the RANGE button. The “AUTO” display indicator will turn off.

2. Press the RANGE key to step through the available ranges until the range desired is selected.

3. Press and hold the RANGE button for 2 seconds to exit manual ranging.

Note: Manual ranging does not apply to the Diode and Continuity functions.

MAX (MAXIMUM READING) MODE

1. Press the MAX button to activate the MAX mode. The display icon "MAX" will appear. The meter

will display and hold the maximum reading and will update only when a new maximum value is

detected.

2. Press the MAX button again to exit the mode.

Note: Max does not apply to the Resistance, Diode and Continuity functions.

DISPLAY BACKLIGHT

Press and hold the button for 2 second to turn the backlight on. The backlight will automatically

turn off after approximately 10 seconds or press and hold the button again for 2 seconds to

manually turn it off.

HOLD

The HOLD function freezes the reading in the display. Press the HOLD button momentarily to

activate or to exit the HOLD function.

Note: The HOLD button does not function in the IR measurement mode.

AUTO SLEEP

If no button is pressed the auto sleep feature will place the meter in sleep mode after approximately

15 minutes of operation. If this happens, press any button to wake the meter or switch the meter to

OFF if it no longer in use.

EX205T-EU-EN V1.0 8/12

Maintenance

WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before

removing the back cover or the battery or fuse covers.

WARNING: To avoid electric shock, do not operate the meter until the battery and fuse covers are

in place and fastened securely.

This MultiMeter is designed to provide years of dependable service, if the following care instructions

are followed:

1. KEEP THE METER DRY. If it gets wet, wipe it off.

2. USE AND STORE THE METER IN NORMAL TEMPERATURES. Temperature extremes can

shorten the life of the electronic parts and distort or melt plastic parts.

3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping it can damage the electronic parts

or the case.

4. KEEP THE METER CLEAN. Wipe the case occasionally with a damp cloth. DO NOT use

chemicals, cleaning solvents, or detergents.

5. USE ONLY FRESH BATTERIES OF THE RECOMMENDED SIZE AND TYPE. Remove old or

weak batteries so they do not leak and damage the unit.

6. IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME, the batteries should be

removed to prevent damage to the unit.

BATTERY and FUSE Replacement

WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before

removing the battery cover.

1. Turn power off and disconnect the test leads from the meter.

2. Open the rear battery/fuse compartment by removing the Phillips head screw on the lower rear of

the meter. .

3. Pull down on the cover to release the latch and then lift it off.

4. Remove the old battery or fuse and install a new one of the correct rating.

5. Place the battery/fuse cover back in place. Secure with the screw.

WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place and

fastened securely.

NOTE: If the meter does not work properly, check the fuses and replace the battery to make sure that

they are still good and that they are properly inserted.

All EU users are legally bound by the Battery Ordinance to return all used batteries to

community collection points or wherever batteries / accumulators are sold!

Disposal in household trash or refuse is prohibited!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

EX205T-EU-EN V1.0 8/12

Specifications

Function Range Resolution Accuracy

200 mV 0.1 mV (0.8% reading + 6 digits)

2V 0.001V

20V 0.01V (0.5% reading + 2 digits)

200V 0.1V

DC Voltage

600V 1V (0.8% reading + 2 digits)

200 mV 0.1 mV

2V 0.001V

20V 0.01V

200V 0.1V

600V 1V

(1.5% reading + 6 digits)

AC Voltage

50/60Hz

All AC voltage ranges are specified from 5% of range to 100% of range

200 A 0.1 A

2000 A 1 A

20 mA 0.01 mA

200 mA 0.1 mA

(1.5% reading + 5 digits)

2.000 0.001 A

10 A 0.01 A (2.5% reading + 5 digits)

DC Current

Note:10A for 30 sec max

200 A 0.1 A

2000 A 1 A

20 mA 0.01 mA

200 mA 0.1 mA

(1.5% reading + 8 digits)

2.000 0.001 A

10 A 0.01 A (3.0% reading + 5 digits)

AC Current

(50/60Hz)

Note: 10A for 30 sec max

200 0.1 (0.8% reading + 5 digits)

2 k0.001 k

20 k0.01 k

200 k0.1 k

(0.8% reading + 2 digits)

2 M0.001 M

Resistance

20 M0.01 M

(2.5% reading + 8 digits)

NOTE: Accuracy is stated at 18oC to 28oC (65oF to 83oF) and less than 75% RH.

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