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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.

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Model 72-7224 / 72-7226: OPERATING MANUAL

10

Содержание 72-7224

Страница 1: ...Digital Clamp Multimeters 72 7224 72 7226 ...

Страница 2: ...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 1 ...

Страница 3: ...pecifications 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 32 33 33 34 35 35 36 37 37 38 39 40 40 42 44 44 45 Title Page Model 72 7224 72 7226 OPERATING MANUAL 2 ...

Страница 4: ...224 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 als...

Страница 5: ...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 4 ...

Страница 6: ...ller 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 symbol...

Страница 7: ...ck 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 ...

Страница 8: ...nd 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 R...

Страница 9: ...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 l l l l l Model 72 72...

Страница 10: ...rent 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 9 ...

Страница 11: ...r 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 10 ...

Страница 12: ...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 11 ...

Страница 13: ...p 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 l l ...

Страница 14: ...T 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 l l V A A Model 72 7224 72 7226 OPERATING MANUAL 13 ...

Страница 15: ...ry rotary switch position The table below indicates which button can be used in which switch position Rotary Switch Positions Function Buttons SELECT REL HOLD l l l l l l l l l l l N A l l l l N A N A V Hz Duty 40A 400A Model 72 7224 72 7226 OPERATING MANUAL 14 ...

Страница 16: ...Display Symbols see figure 2 figure 2 4 1 2 3 5 6 8 9 10 12 13 14 16 7 11 15 Model 72 7224 72 7226 OPERATING MANUAL 15 ...

Страница 17: ...ld lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears The Meter is in the auto range mode in which the Meter automatically selects the range with the best resolution Diode test The continuity buzzer is on Indicator for Duty Data hold is active Indicator for REL mode Model 72 7224 72 7226 OPERATING MANUAL 16 ...

Страница 18: ... or 1000 ohms M Megohm 1x106 or 1 000 000 ohms The unit of Frequency Amperes amps The unit of current Volts The unit of voltage mV Millivolt 1x10 3 or 0 001 volts Indicates negative reading Indicator for TRMS mode The input value is too large for the selected range Model 72 7224 72 7226 OPERATING MANUAL 17 ...

Страница 19: ...re higher than 600V AC DC although readings may be obtained The DC Voltage ranges are 400mV 4V 40V 400V and 600V The AC Voltage ranges are 4V 40V 400V and 600V To measure DC voltage connect the Meter as follows Insert the red test lead into the Hz Duty terminal and the black test lead into the COM terminal 1 Red Black Model 72 7224 72 7226 OPERATING MANUAL 18 ...

Страница 20: ...inals Set the rotary switch to DC mesaurement mode and auto ranging is a default Press SELECT to switch to AC measurement mode or press to switch to manual ranging measurement mode Connect the test leads across with the object being measured The measured value shows on the display 2 3 V REL Model 72 7224 72 7226 OPERATING MANUAL 19 Note l ...

Страница 21: ...4k 40k 400k 4M and 40M To measure resistance connect the Meter as follows Insert the red test lead into the Hz Duty terminal and the black test lead into the COM terminal 1 2 3 Set the rotary switch to Resistance measurement is default to auto range mode press to switch to manual ranging measurement mode Connect the test leads across with the object being measured The measured value shows on the d...

Страница 22: ...test should first be removed from its circuit When resistance measurement has been completed disconnect the test leads from the circuit under test and remove them from the input terminals Model 72 7224 72 7226 OPERATING MANUAL 21 Note l l ...

Страница 23: ...sistors and other semiconductor devices The diode test sends a current through the semicondutor junction then measure the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test the diode out of a circuit connect the Meter as follows Insert the red test lead into the Hz Duty terminal and the black test lead into the COM terminal 1 figure 5 Red Black Model 72 72...

Страница 24: ... circuit under test and remove them from the input terminals Set the rotary switch to Diode measurement mode is a default or presss SELECT to select measurement mode For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode 2 3 Model 72 7224 72 7226 OPERATING MANUAL 23 Note l l ...

Страница 25: ...ert the red test lead into the Hz Duty terminal and the black test lead into the COM terminal Set the rotary switch to and press SELECT button to select measurement mode The buzzer sounds if the resistance of a circuit under test is less than 50 1 2 3 4 5 The buzzer may or may not sound if the resistance of a circuit under test is between 50 to 100 The buzzer will not sound if the resistance of a ...

Страница 26: ...When continuity testing has been completed disconnect the test leads from the circuit under test and remove them from the input terminals Model 72 7224 72 7226 OPERATING MANUAL 25 Note l ...

Страница 27: ... ranges are 10Hz 100Hz 1kHz 10kHz 100kHz 1MHz and 10MHz To measure frequency connect the Meter as follows Insert the red test lead into the Hz Duty terminal and the black test lead into the COM terminal 1 2 3 figure 7 Red Black Set the rotary switch to Hz Connect the test leads across with the object being measured The measured value shows on the display Model 72 7224 72 7226 OPERATING MANUAL 26 ...

Страница 28: ...When frequency measurement has been completed disconnect the test leads from the circuit under test and remove them from the input terminals Model 72 7224 72 7226 OPERATING MANUAL 27 Note l ...

Страница 29: ...e duty cycle range is 0 1 99 9 To measure duty cycle connect the Meter as follows Insert the red test lead into the Hz Duty terminal and the black test lead into the COM terminal 1 2 3 REL Set the rotary switch to Hz and press to select Duty Cycle measurement mode Connect the test leads across with the object being measured The measured value shows on the display Model 72 7224 72 7226 OPERATING MA...

Страница 30: ...When duty cycle measurement has been completed disconnect the test leads from the circuit under test and remove them from the input terminals Model 72 7224 72 7226 OPERATING MANUAL 29 Note l ...

Страница 31: ...eat and machines reaction force It is important that the meter be held firmly and steadily during current measurement Press the lever to open the transformer jaw A A A A Center the conductor within the transformer jaw then release the Meter slowly until the trasnformer jaw is completely closed For best accuracy it is important that the conductor under test be placed in the center of the transforme...

Страница 32: ...y a result When current measurement has been completed disconnect the connection between the conductor under test and the jaw press the lever to open the transformer jaw again and remove the jaw from the conductor under test REL Model 72 7224 72 7226 OPERATING MANUAL 31 Note l l ...

Страница 33: ...button or changing the position of the rotary switch Approximately one minute before entering sleep mode the buzzer will beep five times Immediately before entering sleep mode the buzzer will provide one long beep To disable the Sleep Mode function press and hold SELECT button while turning on the Meter Model 72 7224 72 7226 OPERATING MANUAL 32 ...

Страница 34: ...Display Measurement Speed Updates 3 times second Measuremnet Deviation The conductor being meaured is not placed in the center of the jawt during AC DC current measurement it will cause extra 1 deviation based on the stated accuracy Drop Test 1 meter drop test passed Max Jaw Size 1 1 28mm diameter Projected Max Current conductor size 1 0 26mm diameter Power 1 x 9V battery NEDA1604 or 6F22 or 006P ...

Страница 35: ...uitable for indoor use Altitude Operating 2000m Storage 10000m Safety Compliances IEC 61010 CAT II 600V CAT III 300V over voltage and double insulation standard Temperature and humidity Operating 0ºC 30ºC 85 R H 30ºC 40ºC 75 R H 40ºC 50ºC 45 R H Storage 20ºC 60ºC 85 R H l l l l Note Use near strong electromagnetic fields may cause inaccurate and undesirable readings Model 72 7224 72 7226 OPERATING...

Страница 36: ...3ºC 5ºC Relative humidity 85 R H Temperature coefficient 0 1x specified accuracy 1ºC A DC Voltage Range Resolution Accuracy Overload protection 400 0mV 4 000V 40 00V 400 0V 600V 0 1mV 1mV 10mV 100mV 1V 0 8 3 0 8 1 1 3 600V DC AC Remarks Input impedance 10M Model 72 7224 72 7226 OPERATING MANUAL 35 ...

Страница 37: ...sing average response method Input sine wave then adjust the reading until it is same as the effective value Combine AC and True RMS response method Input sine wave to adjust Non sine wave must follow the below data to adjust Peak factor 1 4 2 0 add 1 0 on the stated accuracy Peak factor 2 0 2 5 add 2 5 on the stated accuracy Peak factor 2 5 3 0 add 4 0 on the stated accuracy 72 7224 72 7224 Model...

Страница 38: ...k 400 0k 4 000M 40 00M 100m 1 10 100 1k 10k 1 2 2 1 2 1 2 2 1 5 2 600Vp D Diode Test Range Resolution Accuracy Overload protection 1mV Display approximate forward voltage drop 0 5V 0 8V 600Vp Remark Open circuit voltage approximate 1 48V Model 72 7224 72 7226 OPERATING MANUAL 37 ...

Страница 39: ... buzzer beeps 600Vp Remark Open circuit voltage approximate 0 45V The buzzer may or may not beeps when the resistance of a circuit under test is between 50 100 The buzzer will not beep when the resistance of a circuit under test is 100 l l l Model 72 7224 72 7226 OPERATING MANUAL 38 ...

Страница 40: ...on 10Hz 100Hz 1kHz 10kHz 100kHz 1MHz 10MHz 0 001Hz 0 01Hz 0 1Hz 1Hz 10Hz 100Hz 1kHz 0 1 3 600Vp For reference only Remark Input Sensitivity as follows When 100kHz 300mV rms When 100kHz 600mV rms When 1MHz 800mV rms Model 72 7224 72 7226 OPERATING MANUAL 39 ...

Страница 41: ...temperature must be 0ºC 40ºC when measuring current Remark To obtain a positive reading when measuring DC current the current must flow in the direction from the rear of the meter to the front Hold the Meter tight do now release The Hall components are very sensitive not only to the magnet but it is important that the meter be held firmly and steadily during current measurement l Model 72 7224 72 ...

Страница 42: ...ansformer jaw is completely closed Make sure the conductor to be tested is placed at the center of the transformer jaw otherwise it will cause 1 0 deviation based on the stated accuracy Remove the transformer jaw Press to display zero Repeat the above 1 procedure The obtained reading will be more precise l l l l l REL Model 72 7224 72 7226 OPERATING MANUAL 41 ...

Страница 43: ...DC AC 40 00A 400 0A 2 5 8 2 5 5 50Hz 60Hz Frequency Response Warning The operating temperature must be 0ºC 40ºC when measuring current Remark It may have 10 digits or less unstable or wrong digits it will not affect measurement result Model 72 7224 72 7226 OPERATING MANUAL 42 ...

Страница 44: ... 72 7726 Combine AC and True RMS response method Input sine wave to adjust Non sine wave must follow the below data to adjust Peak factor 1 4 2 0 add 1 0 on the stated accuracy Peak factor 2 0 2 5 add 2 5 on the stated accuracy Peak factor 2 5 3 0 add 4 0 on the stated accuracy l Change to AC Model 72 7224 72 7226 OPERATING MANUAL 43 ...

Страница 45: ... inside the case A General Service Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Turn the Meter power off when it is not in use Take out the battery if the meter will not be used for a long period of time Do not use or store the Meter in ...

Страница 46: ... To replace the battery Turn the Meter off and remove all the connections from the input terminals Turn the Meter s front case down Remove the screw from the battery compartment and separate the battery compartment from the case bottom Take out the old battery and replace with a new 9V battery NEDA1604 6F22 or 006P Rejoin the case bottom and the battery compartment and reinstall the screw figure 1...

Страница 47: ...Copyright 2006 Tenma Test Equipment All rights reserved Tenma Test Equipment 405 S Pioneer Blvd Springboro Ohio 45066 www tenma com Model 72 7224 72 7226 OPERATING MANUAL 46 ...

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