72-7224 / 72- â€؛ wp-content â€؛ uploads â€؛ 2016 â€؛ 08 â€؛ Tenna-72-7224.pdf Model 72-7224 / 72-7226:

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  • Digital Clamp Multimeters

    72-7224 / 72-7226

  • Table of Contents

    Overview Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure Rotary Switch Function Buttons Button Use Display Symbols Measurement Operation A. DC/AC Voltage Measurement B. Measuring Resistance C. Testing Diodes D. Testing for Continuity E. Frequency Measurement F. Duty Cycle Measurement G. DC/AC Current Measurement

    3 4 5 6 9 10 11 12 14 15 18 18 20 22 24 26 28 30

    Title Page

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Sleep Mode Specifications A. General Specifications B. Environmental Requirements Accuracy Specifications A. DC Voltage B. AC Voltage C. Resistance D. Diode Test E. Continuity Test F. Frequency G. Duty Cycle H. DC Current I. AC Current Maintenance A. General Service B. Replacing the Battery

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    Title Page

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Overview This Operating Manual covers information on safety and cautions. Please read the relevant information carefully and observe all the Warnings and Notes strictly.

    Warning To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe Operation” carefully before using the Meter.

    Digital Clamp Multimeter Models 72-7224 and 72-7226 (hereafter referred to as “the Meter”) are 3 3/4 digits with precise operation, fashionable structure and highly reliable measuring instrument. The Meter uses large scale of integrated circuit with double integrated A/D converter as its core and has full range overload protection.

    Both models measure AC/DC Voltage, AC/DC Current, Frequency, Duty Cycle, Resistance, Diodes and Continuity, and also include Data Hold, Sleep Mode and Relative Mode features.

    Model 72-7226 also provides True RMS measurement.

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Inspection Open the package case and take out the Meter. Check the following items carefully to see if any items are missing or damaged.

    Item Description Qty

    1 2 3 4

    English Operating Manual Test Lead Carrying Bag 9V Battery (NEDA1604, 6F22 or 006P)

    1 piece 1 pair 1 piece 1 piece

    In the event you find any items missing or damaged, please contact your dealer immediately.

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Safety Information This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. II 600V, CAT. III 300V) and double insulation.

    CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient overvoltages than CAT. III. CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than CAT. IV

    Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter may be impaired.

    In this manual, a Warning identifies conditions and actions that pose hazards to the user, or may damage the Meter or the equipment under test.

    A Note identifies the information that user should pay attention to.

    International electrical symbols used on the Meter and in this Operating Manual are explained on page 9.

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Rules For Safe Operation

    Warning To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, adhere to the following rules:

    Before using the Meter inspect the case. Do not use the Meter if it is damaged or the case (or part of the case) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the connectors. Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads with identical model number or electrical specifications before using the Meter. Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and ground. If the value to be measured is unknown, use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained. When measurement has been completed, disconnect the connection between the test leads and the circuit under test, remove the test leads away from the input terminals of the Meter and turn the Meter power off.

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    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • The rotary switch should be placed in the correct position and no change of range made during measurement, to prevent damage to the Meter. Do not carry out the measurement when the Meter’s back case and battery compartment are not closed to avoid electric shock. Do not input higher than 600V between the two Meter’s input terminal to avoid electric shock and damages to the Meter. When working at an effective voltage over 60VDC or 30VAC RMS, special care should be taken for there is danger of electric shock. Use the proper terminals, function, and range for your measurements. Do not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable and strong magnetic field. The performance of the Meter may deteriorate after dampened. When using the test leads, keep your fingers behind the finger guards. Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity and diode. Replace the battery as soon as the battery indicator appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury. When servicing the Meter, use only the same model number or identical electrical specifications replacement parts.

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    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident. Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No abrasive and solvent should be used to prevent the surface of the Meter from corrosion, damage and accident. The Meter is suitable for indoor use. Turn the Meter off when it is not in use and take out the battery when not using for a long time. Periodically check the battery as it may leak after some time. If leakage is apparent, the battery should be immediately replaced to prevent damage to the Meter.

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    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • International Electrical Symbols

    AC (Alternating Current) DC (Direct Current) AC or DC Ground Double Insulated Warning. Refer to the Operating Manual Low Battery Continuity Test Diode Fuse Application around and removal from HAZARDOUS LIVE conductors is permitted. Conforms to Standards of European Union

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • The Meter Structure (see figure 1)

    (figure 1)

    Input Terminals LCD Display Function Buttons Rotary Switch Trigger: press the lever to open the transformer jaws. When the pressure on the lever is released, the jaws will close. Hand Guards: to protect user’s hand from touching the dangerous area. Transformer Jaw: designed to pick up the AC and DC current flowing through the conductor. The conductor under test should pass perpendicular through the jaw.

    1. 2. 3. 4. 5.

    6.

    7.

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Rotary Switch The following table provides information regarding the Rotary Switch positions.

    Rotary Switch Position Power is turned off AC or DC voltage measurement Resistance measurement : Diode test : Continuity test Frequency Measurement and Duty Measurement AC and DC current measurement range

    Function OFF V

    Hz / Duty%

    40A 400A&

    /

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Function Buttons The following table provides information regarding the rotary switch positions.

    Button Operation Performed Press HOLD to enter the Hold mode in any mode, the Meter will beep to confirm. Press HOLD again to exit the Hold mode, the Meter will again beep to confirm. At and range: The Meter is defaults to auto ranging mode. Press the REL key to select manual ranging mode. When the Meter is at manual ranging mode, press to step down the range. At range: Press to enter the REL mode. It subtracts a stored value from the present measurement value and displays a result. At Hz/Duty% range: Press to switch between Hz measurement mode and Duty % measurement mode.

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    HOLD

    REL V

    A

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Button Operation Performed SELECT Press SELECT button to select the alternate functions marked in

    blue colour on the Meter’s faceplate including , , 40 , and 400 .

    If the meter enters sleep mode, press and hold the SELECT button to reactivate meter.

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    V A A

    Model 72-7224 / 72-7226: OPERATING MANUAL

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  • Function Button Use Not every function button is used in every rotary