Extech Instruments EX623 User manual

User's Guide

400Amp True RMS AC/DC Clamp Meter

with IR Thermometer

Model EX623

EX623-en-GB_v3.0 4/15

Introduction

Congratulations on your purchase of this Extech EX623 True RMS Clamp Meter. This meter measures

AC Current, DC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Diode Test, Duty

Cycle and Continuity. Special features include Dual Input Thermocouple Temperature, Non-Contact IR

Temperature and Non-Contact Voltage detector. The double molded case is designed for heavy duty

use. This meter is shipped fully tested and calibrated and, with proper use, will provide years of

reliable service.

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the user must refer

to the manual for further information.

This symbol, adjacent to a terminal, indicates that, under normal use, hazardous

voltages may be present

Double insulation

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.

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

EX623-en-GB_v3.0 4/15

SAFETY NOTES

Do not exceed the maximum allowable input range of any function.

Do not apply voltage to meter when resistance function is selected.

Set the function switch OFF when the meter is not in use.

Remove the battery if meter is to be stored for longer than 60 days.

WARNINGS

Set function switch to the appropriate position before measuring.

When measuring volts do not switch to current/resistance modes.

Do not measure current on a circuit whose voltage exceeds 600V.

When changing ranges always disconnect the test leads from the circuit under test.

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. Repair or replace any damage before use.

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

35VDC. These voltages are considered a shock hazard.

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 is not a toy and must not reach children’s hands. It contains hazardous objects as

well as small parts that the children could swallow. In case a child swallows any of them,

please contact a physician immediately

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

for children if they use them as toys

In case the device is going to be unused for an extended period of time, remove the batteries

to prevent them from draining

Expired or damaged batteries can cause cauterization on contact with the skin. Always,

therefore, use suitable hand gloves in such cases

See that the batteries are not short-circuited. Do not throw batteries into the fire.

Do not directly view or direct the laser pointer at an eye. Low power visible lasers do not

normally present a hazard, but may present some potential for hazard if viewed directly for

extended periods of time

Function Maximum Input

A AC, 400A DC/AC

A DC 400A DC/AC

V DC, V AC 600V DC/AC

Resistance, Capacitance, Frequency, Diode Test 250V DC/AC

A 4000 A

Type K Temperature 30V DC, 24V AC

EX623-en-GB_v3.0 4/15

Description

Meter Description

1. Current clamp

2. Clamp opening trigger

3. IR thermometer and Laser Button

4. HOLD/BACKLIGHT button

5. MODE / ZERO button

6. Backlit LCD Display

7. Type K input jacks

8. Multimeter input jacks

9. IR thermometer sensor and Laser pointer (rear)

10. Function switch

11. PEAK button

12. MAX/MIN button

13. Range button

14. Thermocouple display button

15. Battery compartment (rear)

16. Non-Contact Voltage Detector

17. NCV LED indicator

18. Input shutter

Display icons Description

HOLD Data Hold

APO Auto Power Off

AUTO Autoranging

PPeak Hold

DC Direct Current

AC Alternating Current

MAX Max reading

MIN Min reading

Low battery

ZERO DCA or CAP zero

mV or V Milli-volts or Volts (Voltage)

Ohms (Resistance)

A Amperes (Current)

F Farad (Capacitance)

Hz Hertz (Frequency)

% Duty Ratio

oF and oC Fahrenheit and Celsius units (Temperature)

T1, T2, T1-T2Therocouple 1, Thermocouple 2, Thermocouple difference

n, m, , M, k Unit of measure prefixes: nano, milli, micro, mega, and kilo

))) Continuity test

Diode test

Laser pointer

EX623-en-GB_v3.0 4/15

Operation

NOTES: Read and understand all Warning and Caution statements in this operation manual prior

to using this meter. Set the function select switch to the OFF position when the meter is not in use.

Input Shutter

The Input Shutter inhibits simultaneous connection to the thermocouple jacks and the DMM input

jacks. This is a safety feature which prevents a potentially hazardous condition from existing during

high voltage measurements. Slide the shutter up for test lead measurements or slide it down for

thermocouple temperature measurements.

Non-Contact Voltage Detector

WARNING: Risk of Electrocution. Before use, always test the Voltage Detector on a known live

circuit to verify proper operation.

1. Rotate the Function switch to any measurement position.

2. Place the detector probe tip on the conductor to be tested.

3. If AC voltage is present, the NCV detector light will turn on

with a steady red light.

NOTE: The conductors in electrical cord sets are often twisted. For

best results, move the probe tip along a length of the cord

to assure placing the tip in close proximity to the live

conductor.

NOTE: The detector is designed with high sensitivity. Static

electricity or other sources of energy may randomly trip the sensor. This is normal operation.

EX623-en-GB_v3.0 4/15

AC/DC Current Measurements

WARNING: Disconnect the test leads before making clamp measurements.

1. Rotate the Function switch to the 400AAC/DC

position

2. Press the MODE button to select AC or DC.

3. Press the trigger to open jaw. Fully enclose

only one conductor.

4. Read the current value in the display.

5. If the value is less than 40A, rotate the

function switch to the 40AAC/DC position to

improve resolution.

Polarity

When measuring from front to back of the

EX623 the meter will display a minus (-) sign before the measurement. If the user requires a

positive (+) sign displayed, the meter must be tested from back to front.

DCA Zero

The Zero feature removes offset values and improves accuracy for DC current

measurements. To perform a zero, select ADC and, with no conductor in the jaw, press and hold

the MODE ZERO button for two beeps. The display will zero. The offset value is now stored and

removed from all measurements.

Frequency

When ACV is selected, the measured frequency can be viewed in the lower display.

AC/DC Voltage Measurements

CAUTION: Do not measure voltages if a motor on the circuit is being switched ON or OFF. Large

voltage surges may occur that can damage the meter.

1. Slide the input shutter to the up position.

2. Rotate the function switch to the V position.

3. Press the MODE button to select AC or DC Voltage.

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

Insert the red test lead banana plug into the positive Vjack.

5. 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.

6. Read the voltage value in the display.

Frequency

When ACA is selected, the measured frequency can be viewed in the

lower display.

EX623-en-GB_v3.0 4/15

Resistance Measurements

Note: Remove power from the device under test before making resistance measurements

1. Slide the input shutter to the up position.

2. Set the function switch to the position.

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 one side of the device.

Touch the red test probe tip to the other side of the device.

5. Read the resistance value in the display.

Continuity Test

1. Connect as described for resistance measurements.

2. Press the MODE button to select continuity))).

3. Touch the test probe tips across the circuit or component under test.

4. If the resistance is < 50, a tone will sound.

Diode Test

1. Connect as described for resistance measurements

2. Press the MODE button to select diode test .

3. Touch the test probe tips to the diode or semiconductor junction under test. Note the meter

reading.

4. Reverse the test lead polarity by reversing the red and black leads. Note this reading.

5. The diode or junction can be evaluated as follows:

If one reading displays a value (typically 0.400V to 01.800V) and the other reading

displays OL, the diode is good.

If both readings display OL the device is open.

If both readings are very small or ‘0’, the device is shorted.

EX623-en-GB_v3.0 4/15

Capacitance Measurements

WARNING: To avoid electric shock, discharge the capacitor before measuring.

1. Slide the input shutter to the up position.

2. Rotate the function switch to the capacitance position.

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

Insert the red test lead banana plug into the positive jack.

4. Touch the black test probe tip to one side of the device.

Touch the red test probe tip to the other side of the device.

5. Read the capacitance value in the display.

Note: For very large values of capacitance measurement time can be several

seconds before the final reading stabilizes.

Note: The Zero feature removes stray test lead capacitance to improve the

accuracy of low value capacitance measurements. To perform a zero, Press

and hold the MODE ZERO button for two beeps. The display will zero. The

offset value is now stored and is removed from all measurements.

Frequency and Duty Ratio Measurements

1. Slide the input shutter to the up position.

2. Rotate the function switch to the Hz % Position.

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

Insert the red test lead banana plug into the positive Hz jack.

4. Touch the black test probe tip to one side of the device.

Touch the red test probe tip to the other side of the device.

5. Read the Frequency value on the upper large display.

Read the Duty Ratio on the lower small display.

6. Press the MODE button to display the Duty Ratio on the large

display.

EX623-en-GB_v3.0 4/15

A DC/AC Current Measurements

1. Slide the input shutter to the up position.

2. Rotate the function switch to the A position.

3. Press the MODE button to select AC or DC.

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

Insert the red test lead banana plug into the positive Ajack.

5. Turn power to the circuit under test off and make a break in the circuit.

6. Insert the meter in series with the circuit;

Touch the black test probe tip to the negative side of the break.

Touch the red test probe tip to the positive side of the break.

7. Turn circuit power on.

8. Read the current value in the display.

Type K Temperature Measurements

1. Slide the input shutter to the down position.

2. Rotate the function switch to the TYPE K temperature position.

3. Press the MODE button to select °F or °C.

4. Insert the Temperature Probe(s) into the T1 and/or T2 type k sockets.

5. Place the temperature probe tip(s) where needed.

6. Read the temperature on the display.

7. Press the T1-T2 button to step through the display combinations:

Upper display Lower display

a. T1 T2

b. T2 T1

c. T1-T2 T1

d. T1- T2 T2

Note: In case of an open input or a temperature overrange, the meter will display “- - - -” .

EX623-en-GB_v3.0 4/15

Non-Contact InfraRed Temperature Measurements

1. Rotate the function switch to the IR position.

2. Press the MODE button to select °F or °C.

3. Aim the infrared sensor (rear of the meter) at the surface

to be measured.

4. Press the IRT button to turn on the IR thermometer

and laser pointer. The laser pointer identifies the surface

spot to be measured.

5. The area of the surface to be measured must be larger

than the spot size as determined by the distance to spot

size specification.

6. Read the temperature in the large upper display. When

the IRT button is released the displayed temperature will be held for approx. 10 seconds.

7. Read the MAX temperature in the lower display.

Press the MAX/MIN button to toggle the lower display between the maximum and minimum

measured values.

WARNING: Do not directly view or direct the laser pointer at an eye.

Low power visible lasers do not normally present a hazard, but may

present some potential for hazard if viewed directly for extended periods

of time.

IR Spot to Distance Diagram

The 8:1 spot to distance ratio determines the size of

the measured surface area with respect to the

distance the meter is held away from the surface.

IR Measurement Notes

1. The object under test should be larger than the

spot (target) size calculated by the field of view diagram.

2. If the surface of the object under test is covered with frost, oil, grime, etc., clean before taking

measurements.

3. If an object's surface is highly reflective, apply masking tape or flat black paint to the surface

before measuring.

4. The meter may not make accurate measurements through transparent surfaces such as glass.

5. Steam, dust, smoke, etc. can obscure measurements.

6. To find a hot spot, aim the meter outside the area of interest then scan across (in an up and

down motion) until the hot spot is located.

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