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Measurement Operation(3)

Note

l 

In each range, the Meter has an input impedance of

      10M

Ω

. This loading effect can cause measurement

      errors in high impedance circuits. If the circuit impedance
      is less than or equal to 10k

Ω

, the error is negligible

      (0.1 or less).

l 

When AC voltage measurement has been completed,

17

C.Measuring Resistance

 (see figure 5)

 red      black

( figure 5)

Warning

To avoid damage to the Meter or to the devices
under test, disconnect circuit power and discharge
all the high-voltage capacitors before measuring
resistance.

Model 72-7222: OPERATING MANUAL

disconnect the test leads from the circuit under test,
and remove them from the input terminals.

Содержание 72-7222

Страница 1: ...ent B AC Voltage Measurement C Measuring Resistance D Testing Diodes E Testing for Continuity F Temperature Measurement G AC Current Measurement Sleep Mode Specifications A General Specifications B Environmental Restriction Accuracy Specifications A AC Voltage B DC Voltage C Resistance D Continuity Test E Diode Test F Temperature G AC Current Maintenance A General Service B Replacing the Battery 3...

Страница 2: ...Model 72 7222 OPERATING MANUAL 2 ...

Страница 3: ...arefully before using the Meter The Digital Clamp Multimeter Model 72 7222 hereafter referred to as the Meter is 3 1 2 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 The Meter measures AC DC Voltage AC Current Resista...

Страница 4: ... Open the package case and take out the Meter Check the following items carefully to see if any items are missing or damaged Point Contact Temperature Probe 4 1 5V Battery AAA 2 pieces Model 72 7222 OPERATING MANUAL 4 Item 1 2 3 Description English Operating Manual Test Lead Qty 1 piece 1 pair 1 piece ...

Страница 5: ... 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 sy...

Страница 6: ...educe the range step by step until a satisfactory reading is obtained l Whenmeasurementhasbeencompleted disconnect the connection between the test leads and the circuit under test remove the test leads from the input terminals of the Meter and turn the Meter power off l The rotary switch should be placed in the correct position and no change of range made during measurement to prevent damage to th...

Страница 7: ...a low battery the Meter might produce false readings that can lead to electric shock and personal injury l When servicing the Meter use only the same model number or identical electrical specifications replacement parts l The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident l Soft cloth and mild detergent should be used to clean the surface o...

Страница 8: ...Alternating Current DC Direct Current AC or DC Ground Double Insulated Continuity Test Diode Fuse Warning Refer to the Operating Manual Conforms to Standards of European Union Capacitance Test Low Battery Model 72 7222 OPERATING MANUAL 8 ...

Страница 9: ...itch 5 Trigger press the lever to open the transformer jaws When the pressure on the lever is released the jaws will close 6 Hand Guards to protect user s hand from touching the dangerous area 7 Transformer Jaws designed to pick up the AC current flowing through the conductor Model 72 7222 OPERATING MANUAL ...

Страница 10: ...ry Switch positions Rotary Switch Position Function AC DC voltage measurement Diode test Resistance measurement Ω Power is turned off OFF Continuity test Ω Temperature measurement o C o F AC current measurement range from 0 001A to 400 0A A Model 72 7222 OPERATING MANUAL 10 ...

Страница 11: ...l Press and hold HOLD button while turning on the Meter to display full icons HOLD MAX Press MAX to start recording and updating of maximum values SELECT Press SELECT button to switch between and o C o F Ω Model 72 7222 OPERATING MANUAL 11 The following table provides information regarding function button operations ...

Страница 12: ...ECT MAX HOLD V V N A N A Ω N A N A A A 2 20A N A 200 400A N A o F o C K Type Function Button Model 72 7222 OPERATING MANUAL 12 Not every function button is used in every rotary switch position The table below indicates which button can be used in which switch position ...

Страница 13: ...h the Meter automatically selects the range with the best resolution 5 Diode test 6 The continuity buzzer is on 7 Date hold is active 8 1 AC Indicator for AC voltage or current 2 DC Indicator for DC voltage MAX Maximum reading displayed The unit of temperature o C Centigrade temperature o F Fahrenheit temperature o C o F 9 Ω Ohm The unit of resistance kΩ kilohm 1 x 103 or 1000 ohms MΩ Megaohm 1 x ...

Страница 14: ...e unit of current Display Symbols 2 see figure 2 mV V Volts The unit of voltage mV Millivolt 1x10 3 or 0 001 volts 12 13 Indicates negative reading 14 OL The input value is too large for the selected range Model 72 7222 OPERATING MANUAL 14 ...

Страница 15: ...cross with the object being measured The measured value shows on the display Note l In each range the Meter has an input impedance of 10MΩ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kΩ the error is negligible 0 1 or less A DC Voltage Measurement see figure 3 Model 72 7222 OPERATING MANUAL 15 To avoid damage to the...

Страница 16: ... into the COM terminal 2 Set the rotary switch to V 3 Connect the test leads across with the object being measured The measured value shows on the display Model 72 7222 OPERATING MANUAL 16 When DC voltage measurement has been completed disconnect the test leads from the circuit under test and remove them from the input terminals To avoid damage to the meter or risk of personal injury do not attemp...

Страница 17: ...or is negligible 0 1 or less l When AC voltage measurement has been completed 17 C Measuring Resistance see figure 5 red black figure 5 Warning To avoid damage to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring resistance Model 72 7222 OPERATING MANUAL disconnect the test leads from the circuit under test and remove the...

Страница 18: ...or to resistance measurement l l l l l l For high resistance measurement 1M it normally requires several seconds to obtain a stable reading If reading with shorted test leads is not 0 5 check for loose test leads wrong function selected or enabled data hold function The LCD displays OL indicating open circuit or the tested resistor value is higher than the maximum range of the Meter Resistance mea...

Страница 19: ...ndutor 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 1 Insert the red test lead into the VΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch toΩ and press SELECT button to select measurement mode 3 For forward voltage drop readings on any se...

Страница 20: ...s said above to avoid error display l The LCD will display OL indicating either open circuit or wrong polarity connection l The unit of diode is volt V displaying the forward voltage drop readings l Removing the object from its circuit will allow more accurate measurement l When diode testing has been completed disconnect the test leads from the circuit under test and remove them from the input te...

Страница 21: ...er test is between 50 Ω to 120 Ω 5 The buzzer does not sound if the resistance of a circuit under test is higher than 120Ω Note l The buzzer beeps once when pressing any buttons at any rotary switch positions except at 2 20A positions if the button is valid If the button is not valid it does not beep At 2 20A rotary switch position the buzzer is set not to beep l Approximately one minute before en...

Страница 22: ...e black temperature probe into the COM terminal 2 Set the rotary switch to o F o C and press SELECT button to select o F or o C measurement mode o C measurement mode is default 3 Place the temperature probe to the object being measured The measured value shows on the display red black figure 8 Note l The Meter automatically displays the temperature value inside the Meter when there is no temperatu...

Страница 23: ...he circuit and the ground is greater than 600V Use proper function and range for the measurement The measuremnet ranges of current are 2 000A 20 00A 200 0A and 400A To measure current do the following 1 Set the rotary switch to 2 20A or 200 400 A 2 Press the lever to open the transformer jaws 3 Center the conductor within the transformer jaw The measured value shows on the display it is a effectiv...

Страница 24: ...ain accurate reading measure only one conductor at each time l When current measurement has been completed press the lever to open the transformer jaw again and remove the jaw from the conductor under test Model 72 7222 OPERATING MANUAL 24 ...

Страница 25: ...he meter cannot be activated by turning the rotary switch to an AC current range 2 If using a Function Button to exit the sleep mode only Function Buttons valid to the Rotary Switch position will be effective See the Function Button table on Page 12 3 The Hold function will be cancelled if the Meter is activated by pressing the HOLD button To disable the Sleep Mode function press and hold HOLD but...

Страница 26: ...meter drop test passed l Max Jaw Size 1 1 28mm diameter l Projected Max Current conductor size 1 0 26mm diameter l Power 2pcs of 1 5V battery AAA l Battery Life typically 150hours alkaline battery l Sleep Mode can be disabled l Dimensions H x W x L 1 2 x 3 0 x 8 2 Weight Approximate 260g battery included B Environmental Restrictions l The Meter is suitable for indoor use l Altitude Operating 2000m...

Страница 27: ... 5 600V rms A AC Voltage Auto ranging Remarks l Input impedance 10MΩ 100pF l Displays effective value of sine wave mean value response l Frequency response 40Hz 1kHz l To adjust reading in accordance with effective value B DC Voltage Auto ranging 200 0mV 2 000V 20 00V 200 0V 600V Range Resolution 0 8 1 Overload Protection Accuracy 1 3 600V rms 0 1mV 1mV 10mV 100mV 1V 0 8 3 Remarks Input impedance ...

Страница 28: ...ccuracy 100mΩ Around 50Ω the buzzer beeps 600Vp Remark l Open circuit voltage approximate 0 45V l The buzzer may or may not beep when the resistance of a circuit under test is between 50Ω and 120Ω The buzzer will not beep when the resistance of a circuit under test is greater than 120Ω Range Resolution Overload Protection Accuracy 1mV Display approximate forward voltage drop 0 5V 0 8V 600Vp E Diod...

Страница 29: ...o C 2 10 40 32 o F 3 10 32 o F 752 o F 1 8 752 o F 1832 o F 2 18 600Vp G AC Current Auto ranging Remarks l Displays effective value of sine wave mean value response Range Resolution Overload Protection Accuracy 2 000A 20 00A 200 0A 400A 50Hz 60Hz 400A rms 0 001A 0 01A 0 1A 1A 3 12 4A 2 8 1 5 5 1 9 Frequency Response 4 30 1A 3 12 Model 72 7222 OPERATING MANUAL 29 ...

Страница 30: ... case A General Service l Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents l To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings l Turn the Meter power off when it is not in use l Take out the battery when it is not using for a long time l Do not use or store the Meter in a place of humidity ...

Страница 31: ...he battery 1 Turn the Meter off and remove all the connections from the input terminals 2 Turn the Meter s case top down 3 Remove the screw from the battery compartment and separate the battery compartment from the case bottom 4 Remove the old battery from the battery compartment 5 Replace the battery with 2pcs of new 1 5V AAA battery 6 Rejoin the case bottom and the battery compartment and reinst...

Страница 32: ...Copyright 2006 Tenma Test Equipment All rights reserved Tenma Test Equipment 405 S Pioneer Blvd Springboro Ohio 45066 www tenma com Model 72 7222 OPERATING MANUAL 32 ...

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