Extech Instruments 450 Manual de usuario

User's Guide

Autoranging Multimeter

plus IR Thermometer

Extech 450

Patent Pending

EX450V5.0V 10/062

Introduction

Congratulations on your purchase of the Extech 450 (part number

EX450) Autoranging Multimeter plus IR Thermometer. This meter

measures AC/DC Voltage, AC/DC Current, Resistance, Diode

Test, and Continuity plus Non-Contact IR 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)

750 VAC or 1000VDC.

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.

This symbol indicates there is a potential

hazard from a laser light source.

WARNING

CAUTION

MAX

1000V

EX450V5.0V 10/063

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

V DC or V AC 1000V DC/750V AC, 200Vrms on

200mV range

mA AC/DC 200mA 250V fast acting fuse

A AC/DC 20A 250V fast acting fuse(30

seconds max every 15 minutes)

Resistance, Diode Test,

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 cover to replace the fuse or battery.

7. NEVER operate the meter unless the back cover and the

battery and fuse covers are in place and fastened securely.

8. NEVER look directly at the laser light source or aim the

pointer at an eye.

EX450V5.0V 10/064

Controls and Jacks

1. IR Thermometer and laser pointer

2. 2000 count LCD display

3. HOLD button

4. SELECT button

5. Function switch

6. mA, uA and A input jacks

7. COM input jack

8. Positive input jack

9. MAX hold button (voltage and current)

10. BACKLIGHT button

11. Laser pointer button

12. Protective holster

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

Symbols and Annunciators

•))) Continuity

Diode test

Laser pointer

Battery status

Test lead connection

error

µ micro (10-6) (amps)

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

k kilo (103) (ohms) F Farads (capacitance)

M mega (106) (ohms) Ω Ohms

MAX Maximum hold V Volts

AUTO Autoranging DC Direct current

HOLD Display hold ºF Degrees Fahrenheit

ºC Degrees Centigrade

EX450V5.0V 10/065

Specifications

Function Range Resolution Accuracy

200mV 0.1mV ±(0.5% reading + 2 digits)

2V 0.001V

20V 0.01V

200V 0.1V

±(0.8% reading + 2 digits)

Voltage

1000V 1V ±(1.0% reading + 3 digits)

50 to 400Hz 400Hz to 1kHz

2V 0.001V

±(1.0% reading

+ 4 digits)

±(2.5% reading

+ 8 digits)

20V 0.01V

200V 0.1V

±(1.5% reading

+ 4 digits)

±(3.0% reading

+ 8 digits)

Voltage

750V 1V ±(2.0% reading

+ 6 digits)

±(3.5% reading

+ 8 digits)

200µA 0.1µA

2000µA 1µA

20mA 0.01mA

200mA 0.1mA

±(1.5% reading + 3 digits)

2A 0.001A

Current

20A 0.01A ±(2.5% reading + 5 digits)

50 to 400Hz 400Hz to 1KHz

200µA 0.1µA

2000µA 1µA

20mA 0.01mA

200mA 0.1mA

±(1.8% reading

+ 8 digits)

±(3.0% reading

+ 7 digits)

2A 0.001A

Current

20A 0.01A

±(3.0% reading

+ 8 digits)

±(3.5% reading

+ 10 digits)

NOTE: Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less

than 75% RH.

EX450V5.0V 10/066

Function Range Resolution Accuracy

200Ω0.1Ω±(0.8% reading + 4 digits)

2kΩ0.001kΩ±(0.8% reading + 2 digits)

20kΩ0.01kΩ

200kΩ0.1kΩ

2MΩ0.001MΩ

±(1.0% reading + 2 digits)

Resistance

20MΩ0.01MΩ±(3.0% reading + 5 digits)

-58 to 518°F 1°F

Temp

(IR) -50 to270°C 1°C ±2.0% reading or ±2°C, ±4 °F

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.

Diode Test Test current of 0.3mA maximum,

open circuit voltage 1.5V DC typical

Continuity Check Audible signal will sound if the

resistance is less than 150Ω

(approx.), test current <0.7mA

IR Spectral response 6 to 16µm

IR Emissivity 0.95 fixed

IR distance ratio 8:1

Input Impedance >7.5MΩ(VDC & VAC)

AC Response Average responding

ACV Bandwidth 50Hz to 1kHz

Display 2000 count backlit liquid crystal

Overrange indication “OL” is displayed

Auto Power Off 15 minutes (approximately)

Polarity Automatic (no indication for

positive); Minus (-) sign for negative

Measurement Rate 2 times per second, nominal

Low Battery Indication “ ” is displayed if battery voltage

drops below operating voltage

EX450V5.0V 10/067

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.

EX450V5.0V 10/068

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 “OL” 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 green

V position.

2. Press the SELECT button to

indicate “DC” on the display.

3. Insert the black test lead banana

plug into the negative COM jack.

Insert the red test lead banana plug

into the positive Vjack.

4. 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.

5. Read the voltage in the display.

EX450V5.0V 10/069

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 green

V position.

2. Press the SELECT button to

indicate “AC” on the display.

3. Insert the black test lead banana

plug into the negative COM jack.

Insert red test lead banana plug into

the positive Vjack.

4. 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.

5. Read the voltage in the display.

EX450V5.0V 10/0610

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 2000µA DC, set the

function switch to the yellow

µA position and insert the red

test lead banana plug into the

µA/mA jack.

3. For current measurements up

to 200mA DC, set the function

switch to the yellow mA

position and insert the red test

lead banana plug into the

µA/mA jack.

4. For current measurements up

to 20A DC, set the function

switch to the yellow 20A range and insert the red test lead

banana plug into the 20A jack.

5. Press the SELECT button to indicate “DC” on the display.

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

circuit at the point where you wish to measure current.

7. 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.

8. Apply power to the circuit.

9. Read the current in the display.

Note: When current measurements exceed 10 Amps the meter will

produce an audible warning tone which indicates that the

measurement time should be limited to 30 seconds or less.

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