Klein Tools CL445 User manual

ENGLISH

HVAC Clamp Meter

750V

600V

600A

60M

INSTRUCTION MANUAL

True RMS

Measurement
Technology

-148° –
1832°F

-100° –
1000°C

• DC MICROAMPS

• INRUSH CURRENT

• NON-CONTACT
VOLTAGE TESTING

• AUTO-RANGING

• TEMPERATURE

• AUDIBLE CONTINUITY

Ω

2m

CL445

5001748

CAT IV
600V

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ENGLISH

GENERAL SPECIFICATIONS

Klein Tools CL445 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.

• Environment: Indoor. DO NOT expose to moisture, rain, or snow.

• 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: 9.24" × 3.77" × 1.59" (235 × 96 × 40 mm)

• Weight: 12.58 oz (356.5 g) including batteries

• Calibration: Accurate for one year

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

• Standards: IEC/BS/EN 61010-1, 61010-2-032,

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

Conforms to UL STD.61010-1, 61010-2-032;
Certified to CSA STD.C22.2 NO. 61010-1,
61010-2-032.

5001748

• Pollution degree: 2

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

• Safety Rating: CAT IV 600V

Class 2, Double insulation

• Drop Protection: 6.6 ft. (2 m)

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 low­voltage 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)

600.0μA 0.1μA ±(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 0.01nF ±(4.0% + 25 digits)

600.0nF 0.1nF

Capacitance

Maximum Input: 750V AC RMS or 600V DC

6.000μF 0.001μF

60.00μF 0.01μF

600.0μF 0.1μF

6.000mF 0.001mF ±(5.0% + 9 digits)

±(4.0% + 8 digits)

Temperature

Temperature

Maximum Input: 750V AC RMS or 600V DC

Frequency
(Hz)

Duty Cycle

Maximum Input: 750V AC RMS or 600V DC

-148.0° to 32.0°F
>32.0° to 662.0°F

°F

°C

>662° to 1832°F1°F

-100.0° to 0.0°C
>0.0° to 350.0°C

>350° to 1000°C1°C

99.99Hz 0.01Hz

999.9Hz 0.1Hz

9.999kHz 0.001kHz

60.00kHz 0.01kHz

0.1% to 99.9%
(≤10kHz)

0.1

0.1

0.1%

°F

°C

±(1.0% + 5.4°F )
±(1.0% + 3.6°F )

±(1.0% + 4°F)
±(1.0% + 3°C)
±(1.0% + 2°C)
±(1.0% + 2°C)

±(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 - GENERAL

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.

• Probe assemblies to be used for MAINS measurements shall meet IEC/EN
61010-031 with a voltage RATING of CAT IV 600V or better.

• 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.

WARNINGS - NCV FUNCTION

• When NCV Function is initiated, a blinking or steady red glow and an audible

beep indicate voltage present. If no indication, voltage could still be present.

• Before and after each use of the NCVT, verify operation by testing a known

working circuit that is within the rating of this unit.

• Never assume neutral or ground wires are de-energized. Neutrals in multi-wire

branch circuits may be energized when disconnected and must be retested
before handling.

• The NCV tester WILL NOT detect voltage if:

• The wire is shielded.

• The

operator is not grounded or is otherwise isolated from an effective earth ground.

• The voltage is DC.

• The NCV tester MAY NOT detect voltage if:

• The user is not holding the tester.

• The user is insulated from the tester with a glove or other materials.

• The wire is partially buried or in a grounded metal conduit.

• The tester is at a distance from the voltage source.

• The field created by the voltage source is blocked, dampened, or otherwise
interfered with.

• The frequency of the voltage is not a perfect sine wave between 50 and 60Hz.

• The tester is outside of operation conditions (listed in Specifications section).

• Operation may be affected by differences in socket design and insulation
thickness and type; tester may not be compatible with some types of standard
or tamper resistant (TR) electrical outlets.

• Do not apply to uninsulated hazardous live conductors.

• Detection above 50V is specified under “normal” conditions as specified below.
The tester may detect at a different threshold at different conditions, or may not
detect at all unless:

• The

tip of the tester is within 0.25" of an AC voltage source radiating unimpeded.

• The user is holding the body of the tester with his or her bare hand.

• The user is standing on or connected to earth ground.

• The air humidity is nominal (50% relative humidity).

• The tester is held still.

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SYMBOLS ON METER

AC (Alternating Current)
DC (Direct Current)
Double Insulated Class II
Warning or Caution
Suitable for uninsulated hazardous

live conductors
Diode

Frequency

Hz

Duty-cycle V Voltage (Volts)

%

Temperature (Fahrenheit / Celsius) A Amperage (Amps)

°F/°

C

COM Common NCV

Backlight SEL Select
Positive Negative
Worklight

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

Read Instructions

Ground
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

Degrees (Celsius)

°

C

k

kilo (value × 103)

μ

micro (value × 10-6)

V

Volts (Voltage)

Farads (Capacitance)

F

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FEATURE DETAILS

3

14

13

10

12

7

1

NOTE: There
are no user­serviceable parts
inside meter.

6000 count LCD display

1.

Function selector switch

2.

Clamp

3.

"COM" jack

4.

"VΩµA" jack

5.

Backlight/Worklight button

6.

"RANGE" button

7.

"MAX/MIN" button

8.

Data Hold button

9.

11

18

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.

Worklight

18.

Test Lead Holder

19.

19

9

2

8
6

17

15
16

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FUNCTION BUTTONS

ON/OFF

To power ON the meter, rotate the Function Selector switch 2 from
the OFF setting to any measurement setting. To power OFF the meter,
rotate the Function Selector switch

to the OFF setting. By default,

2

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

2

switch to OFF, then power ON the meter. To deactivate the power OFF
functionality press and hold the "SELECT" button

before powering

12

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
will sound.

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

13

will illuminate, audible signals (beeps)

14

.

In the presence of AC

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

BACKLIGHT

Press Backlight/Worklight button

to turn ON or OFF the backlight.

6

The backlight does not automatically power OFF.

WORKLIGHT

Press and hold Backlight/Worklight button6 for 2 seconds to turn ON
or OFF the worklight. The worklight 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" button

1. Press the "RANGE" button

range (
"RANGE" button

is deactivated on the LCD). Repeatedly press the

to cycle through the available ranges, stopping

7

to manually select measurement

7

.

7

once the desired range is reached.

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

button

for more than two seconds ( is reactivated).

7

MAX/MIN

When the "MAX/MIN" button

is pressed, the meter keeps track of

8

the Maximum and Minimum values.

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 HOLD
HOLD

8

9

to hold the measurement on the display. Press

again to release the display to return to live measuring.

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OPERATING INSTRUCTIONS

5/32

(4 mm)

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 CAT III / CAT IV 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.

0.7" (18 mm)

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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

NEUTRAL WIRE

LIVE

CABLE

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.

GROUND WIRE

HOT WIRE

11

.

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 DC OR 750V AC)

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.

10

Red leadBlack lead

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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: The Hazardous Voltage Indicator will appear on the display
when the voltage is >25V AC or >60V DC.

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

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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. Inrush mode takes a measurement every 20 milliseconds
and updates the display every 100 milliseconds. 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 CURRENT (LESS THAN 600µA)

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 600µA.

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OPERATING INSTRUCTIONS

RESISTANCE MEASUREMENTS

1. Insert RED test lead into VΩµA jack 5, and BLACK test lead
into COM jack 4, and rotate function selector switch 2 to the
Continuity/Resistance/Capacitance/Diode-Test setting.

NOTE: The meter defaults to Continuity testing in this mode. Press
the "SELECT" button 12 once to enter Resistance testing mode. The
Resistance icon 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 "OL". 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

V+A~ setting.

4

, and rotate function selector switch 2 to the

, and BLACK test lead

5

Red leadBlack lead

2. Press clamp trigger
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.

to open clamp 3 and place around

10

NOTE: The Hazardous Voltage Indicator will appear on the display

when the voltage is >25V AC or >60V DC.

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ENGLISH

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

twice to enter Capacitance testing mode.

12

The capacitance unit F 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

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 16 to close jacks and expose the K-Type thermocouple
ports.

2. Insert K-Type thermocouple into port 15 (observe polarity
markings on thermocouple and meter), 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

"SELECT"

button 12. 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 × 1.5V 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.

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CLEANING

Be sure meter is turned off and wipe with a clean, dry lint-free
cloth.

Do not use abrasive cleaners or solvents.

STORAGE

Remove the batteries when meter is not in use for a prolonged
period of time. Do not expose to high temperatures or
humidity. After a period of storage in extreme conditions
exceeding the limits mentioned in the General Specifications
section, allow the meter to return to normal operating
conditions before using.

FCC & IC COMPLIANCE

Se e this product’s page for FCC compliance

Canada ICES-003 (B) / NMB-003 (B)

Do not place equipment and its accessories in the trash.
Items must be properly disposed of in accordance with local
regulations. Please see www.epa.gov/recycle for additional
information.

information.

DISPOSAL / RECYCLE

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