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Tenma 72-7935, Operating Manual

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Overview

Overview

Warning

The Digital Multimeter Model 72-7935 (hereafter referred to as the meter) is a highly
reliable handheld measuring instrument featuring a variety of functions in a compact
design. Features include a 3-3/4 digit LCD display and dual A/D converters and will
measure AC/DC voltage, resistance, capacitance, frequency, duty cycle, diode and
continuity. Additional capabilities include relative mode, data hold, full icon display
and sleep mode.

3

Model 72-7935: OPERATING MANUAL

To avoid the risk of injury from electric shock, read the “Safety Information”
and “Rules For Safe Operation” carefully before using the meter.

Summary of Contents for 72-7935

Page 1: ......

Page 2: ...ional Electrical Symbols The Meter Structure Functional Buttons Measurement Operation A DC Voltage Measurement B AC Voltage Measurement C Measuring Resistance D Frequency and Duty Cycle Measurement E Measuring Diodes Continuity F Capacitance Measurement 3 4 5 6 9 10 11 12 13 15 16 19 20 23 1 Model 72 7935 OPERATING MANUAL ...

Page 3: ...ns Accuracy Specifications A DC Voltage B AC Voltage C Resistance Test D Frequency E Duty Cycle F Diodes and Continuity Test G Capacitance Maintenance A General Service B Replacing the Battery 25 26 27 28 29 30 31 32 32 33 34 35 36 2 Model 72 7935 OPERATING MANUAL ...

Page 4: ...include a 3 3 4 digit LCD display and dual A D converters and will measure AC DC voltage resistance capacitance frequency duty cycle diode and continuity Additional capabilities include relative mode data hold full icon display and sleep mode 3 Model 72 7935 OPERATING MANUAL To avoid the risk of injury from electric shock read the Safety Information and Rules For Safe Operation carefully before us...

Page 5: ...wing items Item 1 2 3 4 Description English Operating Manual Built In Test Lead Vinyl Holder 3V Button Battery CR2032 Qty 1 piece 1 pair 1 piece 1 piece In the event items missing or damaded please contact your dealer immediately 4 Model 72 7935 OPERATING MANUAL ...

Page 6: ...III 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 on International electrical symbols used on the Meter and in this Oper...

Page 7: ... 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 Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding The rotary switch should be placed in the desired position prior to...

Page 8: ...ter 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 diodes or capacitance 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...

Page 9: ...nd 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 only Turn the Meter power off when it is not in use and take out the battery when not using for a long time Periodically check the battery for leaks a leaking battery will...

Page 10: ...l Electrical Symbols Low Battery AC Alternating Current Capacitance Double Insulated Warning Refer to the Operating Manual Conforms to Standards of European Union Ground DC Direct Current Diode Continuity Test Fuse 9 Model 72 7935 OPERATING MANUAL ...

Page 11: ...Meter Structure see figure 1 1 LCD Display 2 SELECT Button 3 RELATIVE Mode Button 4 DATA HOLD Button 5 Hz DUTY Button 6 Rotary Switch 7 Black Test Lead 8 Red Test Lead figure 1 1 2 3 4 5 6 8 7 10 Model 72 7935 OPERATING MANUAL ...

Page 12: ...d mode In Hold mode is displayed and the present value is shown Press Hz DUTY at DCV to step through DCV frequency and duty cycle measurement mode on the LCD will disappear Press Hz DUTY at ACV to step through ACV frequency and duty cycle measurement mode on the LCD will disappear The Meter will be at DCV 400mV or ACV 4V after stepping through frequency and duty cycle measurement mode Therefore it...

Page 13: ... no display on the LCD after turning on the Meter Make sure the Low Battery Display is not on otherwise false readings may occour Pay extra attention to the symbol which is located besides the input terminals of the Meter before carrying out measeurement 12 l l l Model 72 7935 OPERATING MANUAL ...

Page 14: ...Measurement Operation 2 A DC Voltage Measurement see figure 2 figure 2 Red Black 13 Model 72 7935 OPERATING MANUAL ...

Page 15: ...easured with red test lead to the positive and black test lead to the negative The measured value shows on the display Note The LCD displays the negative reading when the test lead connection is reversed When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test 14 l l 3 Model 72 7935 OPERATING MANUAL ...

Page 16: ...hen measuring high voltage To measure AC Voltage connect the Meter as follows 1 Set the rotary switch to ACV range 2 Connect the test leads across with the object being measured The measured value shows on the display Note The LCD displays the negative reading when the test lead connection is reversed When AC voltage measurement has been completed disconnect the connection between the testing lead...

Page 17: ...Measurement Operation 5 C Measuring Resistance see figure 3 figure 3 Red Black Hz Duty 16 Model 72 7935 OPERATING MANUAL ...

Page 18: ... precision readings in low resistance that is the range of 400Ω short circuit the red and black test leads beforehand and record the reading obtained called this reading as X Then use the equation measured resistance value Y X precision readings of resistance 17 To measure resistance connect the Meter as follows 1 Set the rotary switch to range 2 Connect the test leads across with the object being...

Page 19: ...able reading When there is no input for example in open circuit condition the Meter displays OL When resistance measurement has been completed disconnect the connection between the leads and the circuit under test Measurement Operation 7 18 Model 72 7935 OPERATING MANUAL l l l ...

Page 20: ...resolution is based on the sine wave Note When Hz or Duty Cycle measurement has been completed disconnect the connection between the leads and the circuit under test Measurement Operation 8 19 To measure frequency and duty cycle connect the Meter as follows 1 Set the rotary switch to ACV or DCV range 2 Press Hz DUTY button select Frequency or Duty Cycle measurment mode 3 Connect the test leads acr...

Page 21: ...DC or 30V rms AC to avoid personal injury Measurement Operation 9 20 Testing Diodes Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semiconductor junction and then measures the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test out a diode out of a circuit connect the Meter as follow...

Page 22: ...connection The unit of diode is Volt V displaying the positive connection voltage drop value When diode testing has been completed disconnect the connection between the leads and the circuit under test Measurement Operation 10 21 2 Press SELECT button to select diode test 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place t...

Page 23: ...st for continuity connect the Meter as below 1 Set the rotary switch to Ω range 2 Press SELECT button to select continuity test 3 Connect the test leads across with the object being measured The buzzer sounds continuously if the resistance of a circuit under test is less than 100Ω The LCD displays the resistance value of a circuit under test Model 72 7935 OPERATING MANUAL l ...

Page 24: ...pacitor is discharged Never attempt to test over 60V DC or 30V rms AC to avoid personal injury To measure capacitance connect the Meter as follows 1 Set the rotary switch to Ω range 2 Press SELECT button to select capacitance test 3 Capacitance range open circuit has display value please select relative measuremnet mode by pressing RELATIVE button once 4 Connect the test leads across with the obje...

Page 25: ... cathode For measuring capacitance higher than 100µF it normally requires several secends to obtain a stable reading When capacitance measurement has been completed disconnect the connection between the leads and the circuit under test Measurement Operation 13 24 Model 72 7935 OPERATING MANUAL l l l ...

Page 26: ...el 72 7935 OPERATING MANUAL To preserve battery life the meter enters sleep mode after 15 minutes of inactivity In this mode the battery current draw is approximately 10µA The meter can be reactivated by pressing the SELECT button ...

Page 27: ...0 C 500 C 140 F 1220 F Altitude Operating 2000m Storage 10000m Battery Type 3V button battery CR2032 Battery Deficiency At around 2 4 VDisplay Data Holding Display Negative reading Display Overloading Display OL Dimensions HxWxL 4 25 x 2 25 x 0 5 Weight Approx 4 4OE battery and test lead included Safety Compliances IEC61010 CAT II 300V overvoltage and double insulation standard Certificate General...

Page 28: ...ons 1 Accuracy Specifications 27 Accuracy a reading b digits guarantee for 1 year Operating temperature 230 C 50 C Relative humidity 75 Temperature coefficient 0 1 x specified accuracy 1 0 C Model 72 7935 OPERATING MANUAL ...

Page 29: ...oltage Range Resolution Accuracy Overload Protection Remarks Input Impedance 10MΩ 400mV 4V 40V 300V 0 1mV 1mV 10mV 100mV 0 8 3 0 8 1 300V DC 300V AC Accuracy Specifications 2 28 Model 72 7935 OPERATING MANUAL ...

Page 30: ...n Remarks Input Impedance 10MΩ Frequency response 40Hz 400Hz Display effective value of sine wave mean value response 4V 40V 300V 1mV 10mV 100mV 1 2 3 300V DC 300V AC B AC Voltage Accuracy Specifications 3 29 l l l Model 72 7935 OPERATING MANUAL ...

Page 31: ...y Overload Protection Remarks Open circuit voltage approx 0 45V 400Ω 4kΩ 40kΩ 400kΩ 4MΩ 40MΩ 0 1Ω 1Ω 10Ω 100Ω 1kΩ 10kΩ 1 2 2 1 2 250V AC C Resistance Test 1 2 2 1 5 2 Accuracy Specifications 4 30 Model 72 7935 OPERATING MANUAL ...

Page 32: ... Remarks The inputted voltage is sine wave When 10Hz 10kHz 1V rms When 10kHz 100kHz 30V rms 99 99Hz 999 9Hz 9 999kHz 99 99kHz 0 01Hz 0 1Hz 0 001kHz 0 01kHz 0 5 3 250V AC D Frequency Accuracy Specifications 5 31 l l l Model 72 7935 OPERATING MANUAL ...

Page 33: ...reference 0 1 99 9 0 1 250V AC E Duty Cycle F Diodes and Continuity Test Range Resolution Input Protection Remarks Open circuit voltage approx 1 5V Diode Continuity Buzzer 250V AC Function Open circuit voltage approx 0 45V f 2 7kHz Approx 120Ω buzzer beeps continuously 1mV 0 1Ω Accuracy Specifications 6 32 l l l l Model 72 7935 OPERATING MANUAL ...

Page 34: ...F 4µF 40µF 200µF 0 001nF 0 01nF 0 1nF 0 001µF 0 01µF 0 1µF 4 3 250V AC G Capacitance 5 10 Open circuit voltage around 0 45V Measuring under Relative mode When the tested capacitor is greater than 100µF the reading is only for reference Accuracy Specifications 7 33 l l Model 72 7935 OPERATING MANUAL ...

Page 35: ...ed to do so and have the relevant calibration performance test and service information To avoid electric shock or damage to the Meter do no allow water inside the case 34 This section provides basic maintenance information including battery and fuse replacement instruction Model 72 7935 OPERATING MANUAL ...

Page 36: ...s with cotton bar with detergent as dirt or moisture in the terminals can affect readings Clean terminals with cotton ball with detergent as dirt or moisture in the terminals can affect readings Do not store the Meter in place of humidity high temperature explosive inflammable and strong magnetic field 35 Model 72 7935 OPERATING MANUAL l l l l ...

Page 37: ...Maintenance 3 B Replacing the Battery see figure 4 figure 4 SCREW 36 Model 72 7935 OPERATING MANUAL ...

Page 38: ...nnect the connection between the leads and the circuit under test 2 Turn the Meter OFF 3 Remove the screw from the case bottom separate the case bottom from the case top 4 Remove the battery and replace with a new 3V Button Battery CR2032 5 Rejoin the case bottom and the case top and install the screw END This operating manual is subject to change without notice 37 Model 72 7935 OPERATING MANUAL ...

Page 39: ...Copyright 2005 Tenma Test Equipment All rights reserved 38 Tenma Test Equipment 405 S Pioneer Blvd Springboro Ohio 45066 www tenma com Model 72 7935 OPERATING MANUAL ...

Page 40: ...to change without notice and replaces all data sheets previously supplied The Information supplied is believed to be accurate but the Group assumes no responsibility for its accuracy or completeness any error in or omission from it or for any use made of it Users of this data sheet should check for themselves the Information and the suitability of the products for their purpose and not make any as...

Page 41: ... all data sheets previously supplied The Information supplied is believed to be accurate but the Group assumes no responsibility for its accuracy or completeness any error in or omission from it or for any use made of it Users of this data sheet should check for themselves the Information and the suitability of the products for their purpose and not make any assumptions based on information includ...

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