Extech Instruments Extech 470 Manual de usuario

User's Guide

True RMS Multimeter

plus IR Thermometer

Extech 470

Patented

V5.2 3/072

Introduction

Congratulations on your purchase of the Extech 470 (part number

EX470) True RMS Autoranging Multimeter plus IR Thermometer.

This meter measures AC/DC Voltage, AC/DC Current, Resistance,

Capacitance, Frequency, Duty Cycle, Diode Test, and Continuity

plus Thermocouple and 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)

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.

This symbol indicates there is a potential

hazard from a laser light source.

WARNING

CAUTION

MAX

1000V

V5.2 3/073

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

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

400mV range

mA AC/DC 500mA 250V fast acting fuse

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

seconds max every 15 minutes)

Frequency, Resistance,

Capacitance, Duty Cycle,

Diode Test, Continuity

250Vrms for 15sec max

Temperature 60V DC/24V AC

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

pointer at an eye.

V5.2 3/074

Controls and Jacks

1. IR Thermometer and laser pointer

2. 4000 count LCD display

3. HOLD and Backlight button

4. SELECT button

5. Function switch

6. mA, uA and A input jacks

7. COM input jack

8. Positive input jack

9. RANGE hold button

10. RELATIVE 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

n nano (10-9) (capacitance)

µ micro (10-6) (amps, cap)

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

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

M mega (106) (ohms) Ω Ohms

Hz Hertz (frequency) V Volts

% Percent (duty ratio) REL Relative

AC Alternating current AUTO Autoranging

DC Direct current HOLD Display hold

ºF Degrees Fahrenheit ºC Degrees Centigrade

V5.2 3/075

Specifications

Function Range Resolution Accuracy

400mV 0.1mV ±(0.3% reading + 2 digits)

4V 0.001V

40V 0.01V

400V 0.1V

±(0.5% reading + 2 digits)

Voltage

1000V 1V ±(0.8% reading + 3 digits)

50 to 400Hz 400Hz to 1kHz

400mV 0.1mV ±(1.5% reading

+ 15 digits)

±(2.5% reading

+ 15digits)

4V 0.001V

40V 0.01V

400V 0.1V

±(1.5% reading

+ 6 digits)

±(2.5% reading

+ 8 digits)

Voltage

750V 1V ±(1.8% reading

+ 6 digits)

±(3% reading +

8 digits)

400µA 0.1µA

4000µA 1µA

40mA 0.01mA

400mA 0.1mA

±(1.5% reading + 3 digits)

4A 0.001A

Current

20A 0.01A ±(2.5% reading + 5 digits)

50 to 400Hz 400Hz to 1KHz

400µA 0.1µA

4000µA 1µA

40mA 0.01mA

400mA 0.1mA

±(1.8% reading

+ 8 digits)

±(3.0% reading

+ 7 digits)

4A 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.

V5.2 3/076

Function Range Resolution Accuracy

400Ω0.1Ω±(0.8% reading + 4 digits)

4kΩ0.001kΩ±(0.8% reading + 2 digits)

40kΩ0.01kΩ

400kΩ0.1kΩ

4MΩ0.001MΩ

±(1.0% reading + 2 digits)

Resistance

40MΩ0.01MΩ±(3.0% reading + 5 digits)

40nF 0.01nF

±(5.0% reading + 7 digits)

400nF 0.1nF ±(3.0% reading + 5 digits)

4µF 0.001µF

40µF 0.01µF ±(3.5% reading + 5 digits)

Capacitance

100µF 0.1µF ±(5.0% reading + 5 digits)

5.000Hz 0.001Hz

50.00Hz 0.01Hz

±(1.5% reading + 5 digits)

500.0Hz 0.1Hz

5.000kHz 0.001kHz

50.00kHz 0.01kHz

500.0kHz 0.1kHz

±(1.2% reading + 2 digits)

5.000MHz 0.001MHz

10.00MHz 0.01MHz ±(1.5% reading + 4 digits)

Frequency

Sensitivity: 0.8V rms min. @ 20%to 80% duty cycle and <100kHz; 5Vrms

min @ 20% to 80% duty cycle and > 100kHz.

0.1 to 99.9% 0.1% ±(1.2% reading + 2 digits)

Duty Cycle

Pulse width: 100µs - 100ms, Frequency: 5Hz to 150kHz

-4 to 1382°F 1°F

Temp

(type-K) -20 to 750°C 1°C

±(3.0% reading + 3 digits)

(probe accuracy not included)

-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.

V5.2 3/077

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

Temperature Sensor Requires type K thermocouple

IR Spectral response 6 to 16µm

IR Emissivity 0.95 fixed

IR distance ratio 8:1

Input Impedance >7.5MΩ(VDC & VAC)

AC Response True rms

ACV Bandwidth 50Hz to 1kHz

Crest Factor <3:1 at full scale & <6:1 at half scale

Display 4000 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

Battery One 9 volt (NEDA 1604) battery

Fuses mA, µA ranges; 0.5A/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.

Patent Notice U.S. Patent 7,056,012

V5.2 3/078

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 response 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.

V5.2 3/079

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.

V5.2 3/0710

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 4000µA 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 400mA 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 A range

and insert the red test lead banana plug into the Ajack.

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.

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