Klein Tools Cl390 400a Ac-dc Auto-ranging Digital Clamp Meter Instruction Manual

INSTRUCTION MANUAL
400A AC/DC Auto-Ranging
Digital Clamp Meter 

True RMS
Measurement
Technology ent ntCAT III
600V

-40° – 1832°F -40° – 1000°C

• AC/DC CURRENT
• HIGH VISIBILITY DISPLAY
• NON-CONTACT VOLTAGE TESTING
• DC MICRO-AMPS
• AUTO-RANGING
• DATA & RANGE HOLD
• TEMPERATURE T Y NNGG SS GGG HO OLD

600V
400A
40M Ω

GENERAL SPECIFICATIONS

Klein Tools CL390 is an automatically ranging true root mean square (TRMS) digital clamp meter that measures AC/DC current via the clamp, AC/DC voltage, DC  microamps, resistance, continuity, frequency, capacitance, tests diodes via test-leads, and temperature via a thermocouple probe. It features high visibility, reverses contrast LCD  display that optimizes viewability both in dark or bright ambient lighting.

• 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 Coefficient: 0.1 x (Quoted Accuracy) per °C above 28°C or below 18°C, corrections are required when the 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: 10.26 oz. (291 g) including batteries
• Calibration: Accurate for one year
• Auto Power-Off (APO): After approx. 5 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
  CAT III: Measurement category III is applicable to test and measure circuits connected to the distribution part 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.

ELECTRICAL SPECIFICATIONS

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

Frequency Range: 50 to 60Hz
Minimum Current Measurable: 0.3A AC or DC

Maximum Input: 600V AC RMS or 600V DC

Maximum Input: 600V AC RMS or 600V DC

Maximum Input: 600V AC RMS or 600V DC

Maximum Input: 600V AC RMS or 600V DC

Maximum Input: 600V AC RMS or 600V DC
Voltage Range: 8V to 240V AC RMS
Pulse Width: >0.1ms, must be zero-crossing signal.

OTHER MEASUREMENT APPLICATIONS
Maximum Input: 600V AC RMS or 600V DC

• 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
• Auto Power off: After ~5 minutes of inactivity.
• Over Limit: “OL” indicated on the display
• Polarity: “-” on display indicates negative polarity
• Display: 3-3/4 digit, 4000 Count LCD

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.

WARNINGS – GENERAL

• 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 test leads are fully seated into jacks, 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 the risk of electric shock, disconnect leads from any voltage source before removing the battery door.
• To avoid the risk of electric shock, do not operate the meter while the 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, the 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 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 the Specifications section).
•  The operation may be affected by differences in socket design and insulation thickness and type; the 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 the earth ground.
• The air humidity is nominal (50% relative humidity).
• The tester is held still.

SYMBOLS ON METER

AC/DC Current	Ω Resistance (in Ohms)
NCV  Non-Contact Voltage tester	Audible Continuity
Double Insulated Class II	DC Microamps
Warning or Caution	Risk of Electrical Shock
Suitable for uninsulated hazardous live conductors
Diode	Capacitance
Hz Frequency	%  Duty-cycle
V Voltage (Volts)	A  Amperage (Amps)
°F °C Temperature (Fahrenheit / Celsius)	SEL Select
+ Positive	– Negative
COM Common	Ground
Backlight Brightness	OFF Power Off

SYMBOLS ON LCD

AC AC (Alternating Current) – Negative Reading Auto Auto Ranging F Farads NCV  Non-Contact Voltage Tester Low Battery °F Degrees (Fahrenheit) M Mega (value x 106) m milli (value x 10-3) n nano (value x 10-9) A Amps Hz% Frequency/Duty Cycle Hazardous Voltage Indicator MIN Minimum Value Hold MAX-MIN Difference between MAX and MIN values

DC-DC (Direct Current) H Data Hold MAX Maximum Value Hold Diode Auto Power Off Audible Continuity °C Degrees (Celsius) k kilo (value x 103) μ micro (value x 10-6) V Volts Ω Ohms ZERO DC Current Zero Function Relative Mode MAX  Maximum Value Hold

FEATURE DETAILS

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 AutoPower Off icon will be visible in the display. By default, the meter will automatically power OFF after 5 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 “SEL/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.

SEL / NCV BUTTON (FOR SECONDARY FUNCTIONS)
Pushing the SEL/NCV button 12 activates the secondary function for each application accessible by the function selector switch 2 . For voltage and current (excluding DC uA),  it toggles between AC and DC. For the other functions, it switches between °F and °C, between Hz and % Duty-cycle, and between Continuity, Resistance, Capacitance, and Diode-Test. The default function for each application is printed on the meter in white; the secondary function or function for each set is printed on the meter in orange.

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 the 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 flash, audible signals (beeps) will sound, and dashes will appear on the display. As the NCV sensing antenna 14 approaches the voltage source, more dashes will be presented on the display and the frequency of the audible sound will increase. Release the SEL/NCV button to exit NCV testing mode
NOTE: Only voltages of 40V AC or greater will be detected.

BACKLIGHT BRIGHTNESS
Press and hold the HOLD/Brightness button 9 to toggle between high and low brightness for the backlight. By default, the meter will use the low brightness setting.
RANGE
The meter defaults to the auto-ranging mode for voltage and resistance measurements. This mode automatically determines the most appropriate measurement range for the testing that is being conducted.
The icon AUTO will be visible in the display. To manually force the meter to measure in a different range, use the “RANGE” button 6.

1. Press the “RANGE” button 6 to manually select the measurement range ( is deactivated on the LCD). Repeatedly press the “RANGE” button 6 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 6 for more than two seconds ( is reactivated).

MAX/MIN
The “MAX/MIN” function can be used when measuring voltage, current, resistance, temperature, and DC μA functions. When the “MAX/MIN” button 7 is pressed, the meter keeps track of the Maximum and Minimum values, and the difference between the Maximum and Minimum values while continuing to take samples.

1. When measuring, press the “MAX/MIN” button 7 to toggle between the Maximum value (MAX), the minimum value (MIN), and the difference between Maximum and  Minimum (MAX-MIN) values. “MAX”, “MIN”, or “MAX-MIN” will appear on the display, indicating the value being shown. If a new maximum or minimum occurs the
   display updates with that new value.
2. Press “MAX/MIN” button 7 for more than two seconds to return to normal measuring mode.

RELATIVE MODE
REL Measurement: Press REL/ZERO 8 to initiate measurement relative to the current reading. The REL icon will be present on the display. Subsequent measurements are displayed relative to the original measurement. (Applies to AC/DC Voltage, AC Current, Capacitance, DC μA, and Temperature). Press REL/ZERO 8 again to exit relative mode.
DC ZERO Function: When measuring DC current with the clamp, press REL/ZERO to activate the DC current zero function. This will set the display to zero by subtracting the current value as an offset. The ZERO icon will be present on the display. Press REL/ZERO 8 again to exit DC current zero modes.

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.

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/DC 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 400A setting.
2. Place clamp around the wire. The current measurement will be shown in the display.

NOTE: The meter defaults to AC measurement. Press the SEL/NCV button to toggle between AC and DC modes. The AC or DC icon on the display indicates which mode is selected.
NOTE: If the measurement is less than 40A, rotate the Function Selector switch 2 to the 4/40A setting for improved resolution.

NOTE: If non-zero values are displayed prior to measuring in DC current mode, a DC zero offset correction is required. With meter in DC current mode, press the  EL/ZERO button 8 to activate the DC current ZERO function. ZERO icons will be present on the display. Subsequent DC current measurements automatically subtract the offset correction for improved accuracy. Press REL/ZERO button 8 to return to normal measuring mode.
NOTE: Do not use DC current function if the Magnetic Hanger accessory is attached to the back of the meter. Interferences from the magnet can lead to inaccurate measurements.

Disconnect test leads when measuring with the clamp.

AC/DC VOLTAGE (LESS THAN 600V)
1. Insert RED test lead into VΩμA jack 5, and BLACK test leads into COM jack 4 and rotate function selector switch 2 to the V setting for AC or DC measurements. The meter defaults to AC measurement. To measure DC, press the SEL/NCV button 12 to toggle between AC and DC modes. The AC or DC icon on the LCD indicates which mode is selected.

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, this indicates negative polarity for DC voltage.
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 the mV range for V AC the “RANGE” button 8 must be used.
Manual Mode Sequence

NOTE: When voltages in excess of 25V AC or 60V DC are measured the hazardous voltage indicator will be present on the display.

CONTINUITY

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. Ensure that the Continuity Testing icon is visible on the display. If not, press the “SEL/NCV” button 12  repeatedly until the icon is shown.
2. Remove power from the circuit.
3. Test for continuity by connecting the conductor or circuit with test leads. If resistance is measured less than 10Ω, an audible signal will sound and the display will show a resistance value indicating continuity. If the circuit is open display will show “OL”.

DO NOT attempt to measure continuity on a live circuit.

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 “SEL/NCV” button 12 repeatedly until the resistance icon appears on the display.
2. Remove power from the circuit.
3. Measure resistance by connecting test leads to the 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 “OL” This is normal.
DO NOT attempt to measure the resistance on a live circuit.

CAPACITANCE

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. To measure capacitance, press the “SEL/NCV” button 12 repeatedly until nF appears on the display.
2. Remove power from the 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.

DIODE TEST

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 “SEL/NCV” button 12 repeatedly until the diode icon appears on the display.
   The touch test leads to the 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.

μA DC CURENT (LESS THAN 200 μA)

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 DC μA setting. The “μA” and “DC” icons will appear on the display.
2. Remove power from the circuit and open the circuit at the measurement point.
3.  Connect test leads in series with the circuit.
4. Apply power to the circuit to take the measurement.

DO NOT attempt to measure more than 200μA.

FREQUENCY / DUTY-CYCLE

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 Frequency/Duty-CycleHz% setting.
   NOTE: The meter defaults to Frequency testing in this mode. To enter Duty-Cycle testing mode, press the “SEL/NCV” button 12 once. Ensure that the appropriate icon (either Hz or %) appears on the display.
2. Measure by connecting test leads across the circuit.

TEMPERATURE

1. Insert K-type thermocouple into the VΩμA 5 and COM 4 jacks (observe polarity markings on thermocouple and meter), and rotate function selector switch 2 to the temperature setting.
   NOTE: The meter defaults to the Fahrenheit scale in this model. To enter the Celsius scale, press the “SEL/NCV” button 12 once. Ensure that the appropriate icon (either °F or °C) appears on the display.
2. To measure temperature, make contact between the thermocouple tip and the object being measured. When the thermocouple tip and object are in thermal equilibrium, the measurement on the display will stabilize.

Remove thermocouple before switching the meter to other measurement functions.
The thermocouple included with the original purchase is suitable for temperatures below 446°F / 230°C only. To measure higher temperatures, a K-type thermocouple with the appropriate measurement range should be used.

MAINTENANCE

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

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

To avoid the risk of electric shock, disconnect leads from ric from any voltage source before removing the battery door.
To avoid the risk of electric shock, do not operate the meter while the battery door is removed. Ric enters oved.

CLEANING
Be sure the 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 the 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
www.kleintools.com/warranty

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 1-800-553-5346
[email protected] www.kleintools.com