Klein Tools CL440 User manual

ENGLISH

HVAC Clamp Meter

750V

600V

600A

60M

INSTRUCTION MANUAL

True RMS

Measurement
Technology

-328° –
2462°F

-200° –
1350°C

• MICROAMP DC

• INRUSH CURRENT

• NON-CONTACT
VOLTAGE TESTING

• AUTO-RANGING

• TEMPERATURE

• AUDIBLE CONTINUITY

1m

CL440

Ω

ESPAÑOL pg. 19
FRANÇAIS pg. 37

5001748

CAT IV
600V

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ENGLISH

GENERAL SPECIFICATIONS

Klein Tools CL440 is an automatically ranging true root mean
square (TRMS) digital clamp meter that measures AC current and
inrush via the clamp, AC/DC voltage, DC microamps, resistance,
continuity, frequency, capacitance, and tests diodes via test-leads, and
temperature via a thermocouple probe.

• Operating Altitude: 6562 ft. (2000m)

• Relative Humidity: <95% non-condensing

• Operating Temp: 32° to 122°F (0° to 50°C)

• Storage Temp: 14° to 122°F (-10° to 50°C)

• Accuracy: Values stated at 65° to 83°F (18° to 28°C)

• Temp Coef cient: 0.1 × (Quoted Accuracy) per °C above

28°C or below 18°C, corrections are required when ambient
working temp is outside of Accuracy Temp range

• Dimensions: 10.04" × 3.77" × 1.57" (255 × 96 × 40 mm)

• Weight: 14.22 oz (403 g) including batteries

• Calibration: Accurate for one year

• Auto Power-Off (APO): After approx. 10 minutes of inactivity

• Standards: IEC EN 61010-1, 61010-2-032, 61010-2-033.

IEC EN 61326-1, 61326-2-2.

Conforms to UL STD.61010-1,
61010-2-032,61010-2-033;

Certified to CSA STD.C22.2 NO. 61010-1,

5001748

61010-2-032,61010-2-033.

• Pollution degree: 2

• Accuracy: ± (% of reading + # of least significant digits)

• Drop Protection: 3.3 ft. (1m)

• Safety Rating: CAT IV 600V

Class 2, Double insulation

CAT III: Measurement category III is applicable to test and
measuring circuits connected to the distribution part of the
building’s low-voltage MAINS installation.

CAT IV: Measurement category IV is applicable to test and
measuring circuits connected at the source of the building’s
low-voltage MAINS installation.

• Electromagnetic Environment: IEC EN 61326-1. This

equipment meets requirements for use in basic and controlled
electromagnetic environments like residential properties,
business premises, and light-industrial locations.

Specifications subject to change.

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ELECTRICAL SPECIFICATIONS

Function Range Resolution Accuracy

600.0mV 0.1mV

AC Voltage

(V AC)

DC Voltage

(V DC)

Input Impedance: 10MΩ
Frequency Range: 45 to 400Hz
Maximum Input: 750V AC RMS or 600V DC

6.000V 1mV

60.00V 10mV

600.0V 100mV
750V 1V ±(1.5% + 5 digits)

600.0mV 0.1mV ±(1.0% + 8 digits)

6.000V 1mV

60.00V 10mV

600.0V 100mV ±(1.0% + 3 digits)

±(1.8% + 5 digits)
±(1.5% + 5 digits)

±(1.2% + 5 digits)

±(0.8% + 3 digits)

AC Current

(A AC)

Frequency Range: 50 to 60Hz

DC Microamps

(µA DC)

Maximum Input: 750V AC RMS or 600V DC

Resistance

Maximum Input: 750V AC RMS or 600V DC

60.00A 10mA ±(2.5% + 10 digits)

600.0A 100mA ±(2.0% + 10 digits)

600 μA 0.1 μA ±(1.2% + 5 digits)

600.0Ω 0.1Ω ±(1.2% + 5 digits)

6.000KΩ 1Ω

60.00kΩ 10Ω

600.0kΩ 100Ω

6.000MΩ 1kΩ

60.00MΩ 10kΩ ±(2.0% + 5 digits)

±(1.2% + 3 digits)

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ELECTRICAL SPECIFICATIONS

Function Range Resolution Accuracy

60.00nF 0.010nF ±(4% + 25 digits)

600.0nF 0.100nF

Capacitance

Maximum Input: 750V AC RMS or 600V DC

6.000μF 0.001μF

60.00μF 0.010μF

600.0μF 0.100μF

6.000mF 0.001mF ±(5% + 9 digits)

±(4% + 8 digits)

Temperature

°F

Temperature

°C

Maximum Input: 750V AC RMS or 600V DC

Frequency

Duty Cycle

Maximum Input: 750V AC RMS or 600V DC

-328° to 54°F
55° to 2462°F

-200° to 12°C

13° to 1350°C

10Hz to

60kHz

0.1% to 99.9%
(≤10kHz)

1

°F

1

°C

0.001Hz

to 0.01kHz

0.1%

±(1.5% + 7 digits)
±(1.2% + 6 digits)
±(1.5% + 4 digits)
±(1.2% + 3 digits)

±(0.1% + 5 digits)

±1.5%

(Range: 10% – 90%)

OTHER MEASUREMENT APPLICATIONS

Maximum Input: 600V DC or 750V AC RMS

• Diode Test: Approx. 1mA, open circuit voltage ~3.0V DC

• Continuity Check: Audible signal <10Ω, max current 1.5mA

• Sampling Frequency: 3 samples per second

• Overload: "OL" indicated on display

• Polarity: "-" on display indicates negative polarity

• Display: 3-5/6 digit, 6000 Count LCD

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WARNINGS

To ensure safe operation and service of the meter, follow these instructions.
Failure to observe these warnings can result in severe injury or death.

• Before each use verify meter operation by measuring a known voltage
or current.

• Never use the meter on a circuit with voltages that exceed the category
based rating of this meter.

• Do not use the meter during electrical storms or in wet weather.

• Do not use the meter or test leads if they appear to be damaged.

• Use only with CAT III or CAT IV rated test leads.

• Ensure meter leads are fully seated, and keep fingers away from the
metal probe contacts when making measurements.

• Use caution when working with voltages above 25V AC RMS or 60V DC.
Such voltages pose a shock hazard.

• To avoid false readings that can lead to electrical shock, replace batteries
when a low battery indicator appears.

• Do not attempt to measure resistance or continuity on a live circuit.

• Always adhere to local and national safety codes. Use personal protective
equipment to prevent shock and arc blast injury where hazardous live
conductors are exposed.

• To avoid risk of electric shock, disconnect leads from any voltage source
before removing battery door.

• To avoid risk of electric shock, do not operate meter while battery door is removed.

SYMBOLS ON METER

AC (Alternating Current)
DC (Direct Current)
Double Insulated Class II
Warning or Caution
Diode
Frequency

Hz

Duty-cycle V Voltage (Volts)

%

Temperature (Fahrenheit / Celsius) A Amperage (Amps)

°F/°

C

COM Common NCV

% Duty cycle SEL Select

Backlight Hz Frequency
Positive Negative

AC/DC Current
Resistance (in Ohms)
Audible Continuity
Ground
Risk of Electrical Shock
Capacitance

Non-Contact Voltage Tester

SYMBOLS ON LCD

AC AC (Alternating Current) DC DC (Direct Current)

Negative Reading Data Hold
Auto Ranging MAX Maximum Value Hold

MIN Minimum Value Hold Audible Continuity

Low Battery
Degrees (Fahrenheit)

°

F

M

Mega (value × 106)

m

milli (value × 10-3)

n

nano (value × 10-9) Ohms (Resistance)

A

Amps (Amperage)

Hz%

Frequency/Duty Cycle Auto Power-Off

NCV

Non-Contact Voltage Tester Diode Test
Hazardous Voltage Indicator Inrush

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Degrees (Celsius)

°

C

k

kilo (value × 103)

μ

micro (value × 10-6)

V

Volts (Voltage)

Farads (Capacitance)

F

5

ENGLISH

3

13

10

FEATURE DETAILS

14

11

9

2

12

7

1

NOTE: There
are no user-
serviceable parts
inside meter.

6000 count LCD display

1.

Function selector switch

2.

Clamp

3.

"COM" jack

4.

"VΩµA" jack

5.

Backlight button

6.

"RANGE" button

7.

"MAX/MIN" button

8.

Data Hold button

9.

6

4 5

Clamp trigger

10.

Arrow markings

11.

"SEL/NCV" button

12.

NCV Light

13.

NCV Sensing Antenna

14.

K-Type Thermocouple Inputs

15.

Temperature/Voltage input switch

16.

"InRush" Button

17.

8

6

17

15
16

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FUNCTION BUTTONS

ON/OFF

To power ON the meter, rotate the Function Selector switch
the OFF setting to any measurement setting. To power OFF the meter,
rotate the Function Selector switch 2 to the OFF setting. By default,
the meter will automatically power OFF after 10 minutes of inactivity.
If the meter automatically powers-OFF while in a measurement
setting, press any button to power the meter ON, or rotate Function
Selector
the power OFF functionality press and hold the "SELECT" button
before powering ON from the OFF setting. When auto power OFF
is deactivated, the Auto Power Off icon will not be visible in the
display.

SEL / NCV BUTTON (FOR NCV TESTING)

Press and hold the SEL/NCV button 12 to enter Non-contact Voltage
Testing (NCV) mode to test for presence of AC voltage. The NCV
icon and "EF" will be present on the display. Approach the conductor
under test leading with the sensing antenna
voltage, the red NCV light
sound.

switch to OFF, then power ON the meter.

2

13

Release the SEL/NCV button to exit NCV testing mode.

will flash, audible signals (beeps) will

To deactivate

14

.

In the presence of AC

2

from

12

NOTE: Only voltages of 40V AC or greater will be detected.

BACKLIGHT

Press Backlight button6to turn ON or OFF the backlight. The
backlight does not automatically power OFF.

RANGE

The meter defaults to auto-ranging mode . This mode
automatically determines the most appropriate measurement range
for the testing that is being conducted. To manually force the meter
to measure in a different range, use the "RANGE" button7.

1. Press the "RANGE" button 7 to manually select measurement

range ( is deactivated on the LCD). Repeatedly press the
"RANGE" button 7 to cycle through the available ranges, stopping
once the desired range is reached.

2. To return to auto-ranging mode, press and hold the "RANGE"

button 7 for more than two seconds ( is reactivated).

MAX/MIN

When the "MAX/MIN" button8is pressed, the meter keeps track of
the Maximum and Minimum values.

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FUNCTION BUTTONS

1. When measuring, press "MAX/MIN" button 8 to toggle between

the Maximum value (MAX), the Minimum value (MIN). If a new
maximum or minimum occurs, the display updates with that new
value.

2. Press "MAX/MIN" button8 for more than two seconds to return

to normal measuring mode.

DATA HOLD

Press HOLD9to hold the measurement on the display. Press
HOLD9again to release the display to return to live measuring.

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OPERATING INSTRUCTIONS

CONNECTING TEST LEADS

Do not test if leads are improperly seated. Results could cause
intermittent display readings. To ensure proper connection, firmly
press leads into the input jack completely.

INCORRECT

CORRECT

TESTING IN CAT III MEASUREMENT LOCATIONS

Ensure the test lead shield is pressed firmly in place. Failure to use
the CATIII / CATIV shield increases arc-flash risk.

5/32"

(4 mm)

TESTING IN CAT II MEASUREMENT LOCATIONS

CAT III / CAT IV shields may be removed for CAT II locations. This
will allow testing on recessed conductors such as standard wall
outlets. Take care not to lose the shields.

.7" (18 mm)

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WIRE

NOTE:

measurement can be

made by clamping

around single

conductors, but not

cables containing

both live and neutral

wires. In this case a

line splitter is required,

Klein Cat. No. 69409 is

OPERATING INSTRUCTIONS

AC CURRENT (LESS THAN 600A)

AC Current is measured by pressing the clamp trigger

to open

10

the clamp and placing it around a current-carrying wire. When
measuring, care should be taken to ensure that the clamp is
completely closed with trigger

fully released, and that the wire

10

passes perpendicularly through the center of the clamp in line with
the arrow markings

11

WIRE

.

NOTE: Current
measurement can be
made by clamping
around single
conductors, but not
cables containing
both live and neutral
wires. In this case a
line splitter is required,
Klein Cat. No. 69409 is
recommended.

To measure current:

1. Rotate the Function Selector switch

2

to the A~ setting.

2. Place clamp around wire. The current

measurement will be shown in the display.

Disconnect test leads when

measuring with the clamp.

AC/DC VOLTAGE (LESS THAN 600V)

1. Insert RED test lead into VΩµA jack

into COM jack

V

setting for AC or DC measurements. The meter defaults to

, and rotate function selector switch 2 to the

4

, and BLACK test lead

5

AC measurement. To measure DC, press the "SELECT" button

12

to toggle between AC and DC modes. The AC or DC icon on

the LCD indicates which mode is selected. Note "AC" or "DC" on
the display.

Red leadBlack lead

10

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OPERATING INSTRUCTIONS

Apply test leads to the circuit to be tested to measure voltage.
The meter will auto-range to display the measurement in the most
appropriate range.

NOTE: If "–" appears on the LCD, the test leads are being applied to
the circuit in reverse. Swap the position of the leads to correct this.

NOTE: To access mV range for V AC , the 'RANGE' button

must

7

be used.

Manual Mode Sequence

First

Press

AC Range 0-750V 0-600.0V 0-60.00V 0-6.000V
DC Range 0-60.00V 0-6.000V

Second

Press

Third

Press

0-600.0mV

Fourth

Press

0-600.0V 0-60.00V

Fifth

Press

0-600.0mV

NOTE: When in a voltage setting and the test leads are open,
readings of order mV may appear on the display. This is noise and
is normal. By touching the test leads together to close the circuit
the meter will measure zero volts.

INRUSH CURRENT

The Inrush feature captures starting current of a motor or transformer.
Starting current can assist in diagnosing a motor before it fails.

To measure inrush current:

1. Rotate the Function Selector switch 2 to the AC current A setting.

2. Place clamp3around wire. The current measurement will be
shown in the main display.

3. Press the InRush button

17

to enter the Inrush mode and manually
select 60A or 600A range
by pressing the RANGE button7.
Place the clamp around the compressor
start wire and turn motor on. The
starting current will hold on the main
display. The Inrush measurement period
is 100-miliseconds. The secondary
display measures running current.

4. Press InRush button17 to exit.

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OPERATING INSTRUCTIONS

CONTINUITY

1. Insert RED test lead into VΩµA jack
into COM jack

4

, and rotate function selector switch 2 to the

Continuity/Resistance/Capacitance/Diode-Test

, and BLACK test lead

5

setting.

NOTE: The meter defaults to Continuity testing in this mode. Ensure
that the Continuity Testing icon is visible on the display. If not,
press the "SELECT" button 12 repeatedly until the icon is shown.

2. Remove power from circuit.

3. Test for continuity by connecting conductor or circuit with test
leads. If resistance is measured less than 10Ω, an audible signal
will sound and display will show a resistance value indicating
continuity. If circuit is open display will show "OL".

Red leadBlack lead

DO NOT attempt to measure continuity on a live circuit.

µA DC CURENT (LESS THAN 600 µA)

1. Insert RED test lead into VΩµA jack
COM jack

µA

4

, and rotate function selector switch 2 to the

setting.

, and BLACK test lead into

5

2. Remove power from circuit and open circuit at measurement point.

3. Connect test leads in series with the circuit.

4. Apply power to the circuit to take the measurement.

Red leadBlack lead

DO NOT attempt to measure more than 600 µA.

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OPERATING INSTRUCTIONS

RESISTANCE MEASUREMENTS

1. Insert RED test lead into VΩµA jack
into COM jack

4

, and rotate function selector switch 2 to the

Continuity/Resistance/Capacitance/Diode-Test

, and BLACK test lead

5

setting.

NOTE: The meter defaults to Continuity testing in this mode. Press
the "SELECT" button
Resistance icon

once to enter Resistance testing mode. The

12

will appear on the display.

2. Remove power from circuit.

3. Measure resistance by connecting test leads to circuit. The
meter will auto-range to display the measurement in the most
appropriate range.

Red leadBlack lead

NOTE: When in a Resistance setting and the test leads are open
(not connected across a resistor), or when a failed resistor is under
test, the display will indicate "O.L." This is normal.

DO NOT attempt to measure resistance on a live circuit.

AC VOLTAGE + AC AMPERAGE FUNCTION

1. Insert RED test lead into VΩµA jack
into COM jack

4

, and rotate function selector switch 2 to the

, and BLACK test lead

5

V+A~ setting.

Red leadBlack lead

2. Press clamp trigger

to open clamp 3 and place around

13

current-carrying wire.

3. The main display will show AC Voltage and the secondary
display will show AC Amperage. Pressing the select button
will reverse the displays; the main display will show AC
Amperage and the secondary display will show AC Voltage.

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OPERATING INSTRUCTIONS

CAPACITANCE

1. Insert RED test lead into VΩµA jack
into COM jack
Continuity/Resistance/Capacitance/Diode-Test

4

, and rotate function selector switch 2 to the

, and BLACK test lead

5

setting.

NOTE: The meter defaults to Continuity testing in this mode. Press
the "SELECT" button
The Capacitance icon

twice to enter Capacitance testing mode.

12

will appear on the display. The meter

should read 0 nF with test leads open.

2. Remove power from circuit.

3. Measure capacitance by connecting test leads across the
capacitor. The meter will auto-range to display the measurement
in the most appropriate range.

Red leadBlack lead

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OPERATING INSTRUCTIONS

DIODE TEST

1. Insert RED test lead into VΩµA jack
into COM jack

4

, and rotate function selector switch 2 to the

Continuity/Resistance/Capacitance/Diode-Test

, and BLACK test lead

5

setting.

NOTE: The meter defaults to Continuity testing in this mode. Press
the "SELECT" button
The Diode icon

three times to enter Diode testing mode.

12

will appear on the display.

2. Touch test leads to diode. A reading of 200-800mV on display
indicates forward bias, "OL" indicates reverse bias. An open
device will show "OL" in both polarities. A shorted device will
show approximately 0mV.

Red leadBlack lead

FREQUENCY / DUTY-CYCLE

1. Insert RED test lead into VΩµA jack
into COM jack
Frequency/Duty-Cycle

4

, and rotate function selector switch 2 to the

setting.

and BLACK test lead

5

NOTE: The meter defaults to Frequency testing in this mode. To enter

Duty-Cycle testing mode, press the "SELECT" button
that the appropriate icon (either

Hz

or %) appears on the display.

once. Ensure

12

2. Measure by connecting test leads across the circuit.

Red leadBlack lead

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OPERATING INSTRUCTIONS

TEMPERATURE

1. Remove leads from meter and slide the temperature probe input
switch 18 to close jacks and expose the K-Type thermocouple
ports.

2. Insert K-type thermocouple into port 15 ( and rotate function
selector switch 2 to the Temperature setting.

K-Type Thermocouple

NOTE: The meter defaults to Fahrenheit scale in this mode. To enter
Celsius scale, press the SEL button 9. Ensure that the appropriate
icon (either °F or °C) appears on the display.

3. To measure temperature, make contact between the
thermocouple tip and the object being measured. When
thermocouple tip and object are in thermal equilibrium, the
measurement on the display will stabilize. The meter will auto­range to display the measurement in the most appropriate range.

Remove thermocouple before switching meter to other

measurement functions.

T

he thermocouple included with the original purchase
is suitable for temperatures below 356°F / 180°C only.
To measure higher temperatures, a K-type thermocouple
with the appropriate measurement range should be used.

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MAINTENANCE

BATTERY REPLACEMENT

When indicator is displayed on LCD, batteries must be replaced.

1. Loosen captive screw and remove battery cover.

2. Replace 3 × AAA batteries (note proper polarity).

3. Replace battery cover and fasten screw securely.

T

o avoid risk of electric shock, disconnect leads from any voltage

source before removing battery door.

To avoid risk of electric shock, do not operate meter while
battery door is removed.

17

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