Extech EX470 User guide

User's Guide

True RMS Multimeter
plus IR Thermometer

Extech 470

Patent Pending

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.

WARNING

CAUTION

MAX
600V

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.

This symbol indicates there is a potential
hazard from a laser light source.

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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:

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

Function Maximum Input

mA AC/DC 500mA 250V fast acting fuse
A AC/DC 20A 250V fast acting fuse(30

Frequency, Resistance,
Capacitance, Duty Cycle,
Diode Test, Continuity
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.

Input Protection Limits

400mV range

seconds max every 15 minutes)
250Vrms for 15sec max

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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
µ micro (10
m milli (10
k kilo (10
M mega (10
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

-9

) (capacitance)

-6

) (amps, cap)

-3

) (volts, amps) A Amps

3

) (ohms) F Farads (capacitance)

6

) (ohms) Ω Ohms

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Specifications

Function Range Resolution Accuracy

DC
Voltage

AC
Voltage

DC
Current

AC
Current

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

400mV 0.1mV

4V 0.001V

40V 0.01V

400V 0.1V

1000V 1V

50 to 400Hz 400Hz to 1kHz

400mV 0.1mV

4V 0.001V

40V 0.01V

400V 0.1V

750V 1V

400µA 0.1µA

4000µA 1µA

40mA 0.01mA

400mA 0.1mA

4A 0.001A

20A 0.01A

50 to 400Hz 400Hz to 1KHz

400µA 0.1µA

4000µA 1µA

40mA 0.01mA

400mA 0.1mA

4A 0.001A
20A 0.01A

than 75% RH.

±(0.3% reading + 2 digits)

±(0.5% reading + 2 digits)

±(0.8% reading + 3 digits)

±(1.5% reading

+ 15 digits)

±(1.5% reading

+ 6 digits)

±(1.8% reading

+ 6 digits)

±(1.5% reading + 3 digits)

±(2.5% reading + 5 digits)

±(1.8% reading

+ 8 digits)

±(3.0% reading
+ 8 digits)

±(2.5% reading

+ 15digits)

±(2.5% reading

+ 8 digits)

±(3% reading +

8 digits)

±(3.0% reading
+ 7 digits)

±(3.5% reading
+ 10 digits)

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Function Range Resolution Accuracy

Resistance

400Ω 0.1Ω ±(0.8% reading + 4 digits)

4kΩ 0.001kΩ ±(0.8% reading + 2 digits)

40kΩ 0.01kΩ

400kΩ 0.1kΩ

±(1.0% reading + 2 digits)

4MΩ 0.001MΩ

40MΩ 0.01MΩ ±(3.0% reading + 5 digits)

Capacitance

40nF 0.01nF

400nF 0.1nF

4µF 0.001µF

40µF 0.01µF

±(5.0% reading + 7 digits)

±(3.0% reading + 5 digits)

±(3.5% reading + 5 digits)

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

Frequency

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

±(1.2% reading + 2 digits)

500.0kHz 0.1kHz

Duty Cycle

5.000MHz 0.001MHz

10.00MHz 0.01MHz

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%

±(1.5% reading + 4 digits)

.

±(1.2% reading + 2 digits)

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

Temp
(type-K)

Temp
(IR)

-4 to 1382°F 1°F

-20 to 750°C 1°C

-58 to 518°F 1°F

-50 to270°C 1°C

±(3.0% reading + 3 digits)

(probe accuracy not included)

±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.

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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 -4

o

F 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.

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