Klein Tools CL120 400A AC Auto-Ranging Digital Clamp Meter

Key Features

• Non-Contact Voltage Testing
• Auto-Ranging
• Data Hold
• Range Hold
• Audible Continuity

Specifications: 600V~, 400A~, 20MΩ, 2m

General Specifications

The Klein Tools CL120 is an automatically ranging digital clamp-meter that measures AC current via the clamp, and AC/DC voltage, resistance, and continuity via test-leads.

• Operating Altitude: 6562 ft. (2000 m)
• 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 Coefficient: 0.1 x (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: 8.46" x 3.54" x 1.50" (215 x 90 x 38 mm)
• Weight: 11.04 oz. (313 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, 61010-2-032,61010-2-033.
• Pollution degree: 2
• Accuracy: ± (% of reading + # of least significant digits)
• Drop Protection: 6.6 ft. (2m)
• Safety Rating: CATIII 600V, Class 2, Double insulation
• 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.

Electrical Specifications

Input Impedance: 10MΩ

Frequency Range: 45 to 400Hz (AC Voltage), 50 to 60Hz (AC Current)

Maximum Input: 600V AC RMS or 600V DC

Other Measurement Applications

• Continuity Check: Audible signal <10Ω, max current 1.5mA
• Sampling Frequency: Approx. 3 samples per second
• Overload: "OL" indicated on display
• Polarity: "-" on display indicates negative polarity
• Display: 3 ½ digit, 2000 Count LCD

Safety Warnings

General Warnings

• WARNING: 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.
• Do not open the meter to replace batteries while the probes are connected.
• 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.

NCV Function Warnings

• 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 500Hz. 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.

Symbols

Symbols on Meter

• AC (Alternating Current)
• DC (Direct Current)
• Ω Resistance (in Ohms)
• Audible Continuity [))) symbol]
• Double Insulated Class II
• Ground [Ground symbol]
• ! Warning or Caution [Warning symbol]
• Risk of Electrical Shock [Shock symbol]
• 4 Suitable for uninsulated hazardous live conductors
• V Voltage (Volts)
• A Amperage (Amps)
• COM Common
• NCV Non-Contact Voltage Tester
• Backlight [Backlight symbol]
• + Positive
• SEL Select
• - Negative

Symbols on LCD

• AC AC (Alternating Current)
• DC DC (Direct Current)
• - Negative Reading
• H Data Hold
• AUTO Auto Ranging
• MAX Maximum Value Hold
• Low Battery [Battery symbol]
• Audible Continuity [))) symbol]
• M Mega (value x 10⁶)
• k kilo (value x 10³)
• m milli (value x 10⁻³)
• V Volts
• A Amps
• Ω Ohms
• NCV Non-Contact Voltage Tester
• Auto Power-Off [Power symbol]
• Hazardous Voltage Indicator [Hazard symbol]

Feature Details

The clamp meter features a 2000 count LCD display (1), a function selector switch (2), a clamp jaw (3), a COM jack (4), a VΩ jack (5), a backlight button (6), a RANGE button (7), a MAX button (8), a Data Hold button (9), a clamp trigger (10), arrow markings (11) on the clamp jaw, an NCV Button (12), an NCV Light (13), and an NCV Sensing Antenna (14).

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

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 (2) to the OFF setting. The Auto-Power Off icon [⚙️ symbol] will be visible in the display. 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 (2) switch to OFF, then power ON the meter. To deactivate Auto-Power OFF functionality, press and hold the "NCV" button (12) 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.

BACKLIGHT

Press the Backlight button symbol (6) to turn ON or OFF the backlight. The backlight does not automatically power OFF.

RANGE

The meter defaults to auto-ranging mode [AUTO symbol]. 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 (7).

1. Press the "RANGE" button (7) to manually select measurement range (AUTO 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 (AUTO is reactivated).

MAX

When the "MAX" button (8) is pressed, the meter keeps track of the Maximum value as the meter continues to take samples.

1. When measuring, press "MAX" button (8) to display the maximum value. If a new maximum occurs, the display updates with that new value.
2. Press "MAX" button (8) again to return to normal measuring mode.

DATA HOLD

Press the Data Hold button (9) to hold the current measurement on the display. Press again to return to live measuring mode.

NCV

Press and hold the "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 (14). In the presence of AC voltage, the red NCV light (13) will illuminate and audible signals (beeps) will sound. As the NCV sensing antenna (13) approaches the voltage source, the frequency of the audible sound will increase. Release the "NCV" button to exit NCV testing mode.

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

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.

Correct Connection: Leads are fully inserted into the jacks.

Incorrect Connection: Leads are not fully inserted.

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.

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.

AC Current (Less Than 400A)

AC Current is measured by pressing the clamp trigger (10) to open 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 (10) fully released, and that the wire passes perpendicularly through the center of the clamp in line with the arrow markings (11).

To measure current:

1. Rotate the Function Selector switch (2) to the 200/400 A setting.
2. Place clamp around wire. The current measurement will be shown in the display.

NOTE: If the measurement is less than 20A, rotate the Function Selector switch (2) to the 2/20 A setting for improved resolution.

! Disconnect test leads when measuring with the clamp.

AC/DC Voltage (Less Than 600V)

1. Insert RED test lead into VΩ jack (5), and BLACK test lead into COM jack (4), and rotate function selector switch (2) to the DC Voltage V or AC Voltage V~ setting. Note "DC" or "AC" on the display.

2. 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: 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.

NOTE: To access mV range for V AC V~, the "RANGE" button (7) must be used.

Manual Mode Sequence

NOTE: When voltages in excess of 25V AC or 60V DC are measured, the Hazardous Voltage Indicator [Hazard symbol] will appear on the display.

Resistance Measurements

1. Insert RED test lead into VΩ jack (5), and BLACK test lead into COM jack (4), and rotate function selector switch (2) to the Resistance Ω setting. The resistance symbol Ω 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.

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.

Continuity

1. Insert RED test lead into VΩ jack (5) and BLACK test lead into COM jack (4), and rotate function selector switch (2) to the Continuity [))) symbol] setting.

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".

! DO NOT attempt to measure continuity on a live circuit.

Maintenance

Battery Replacement

When the Low Battery indicator [? symbol] is displayed on LCD, batteries must be replaced.

1. Loosen captive screw and remove battery cover.
2. Replace 3 x AAA batteries (note proper polarity).
3. Replace battery cover and fasten screw securely.

! 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.

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.

Warranty and Disposal

Warranty: Visit www.kleintools.com/warranty for warranty information.

Disposal/Recycle: 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.

Customer Service

KLEIN TOOLS, INC.

450 Bond Street Lincolnshire, IL 60069

Phone: 1-800-553-4676

Email: customerservice@kleintools.com

Website: www.kleintools.com