Tenma 72-7930, Operating Manual

Page 1: ...istance D Measuring Diodes E Testing for continuity F Capacitance measurement G Temperature Measurement H Measuring Transistors I Frequency Measurement Sleep Mode Operation of Hold Mode General Specifications Accuracy Specifications A DC Voltage B AC Voltage C DC Current D AC Current E Resistance Test F Diodes Test G Continuity Test H Capacitance I Temperature J Transistor Test 3 10 4 11 12 14 14 ...

Page 2: ...Title Page K Frequency Maintenance A General Services B Replacing the Fuses C Replacing the Battery 31 32 32 32 33 Model 72 7930 OPERATING MANUAL 2 ...

Page 3: ...ferred to as The Meter is a highly reliable handheld measuring instrument featuring an extra large LCD 3 1 2 digit display and full range overload protection It is capable of measuring AC DC voltage AC DC current resistance capacitance temperature frequency Transistor HFE diode and continuity check It also features a full icon display with proper test lead indication Model 72 7930 OPERATING MANUAL...

Page 4: ...ealer immediately 1 Operating Manual 2 Test Leads 3 Multi Purpose Socket 4 Point Contact Temperature Probe 5 9V Battery NEDA 1604 6F22 or 009P This meter includes the following items 1 piece 1 pair 1 piece 1 piece 1 piece Item Description Qty Model 72 7930 OPERATING MANUAL 4 ...

Page 5: ... 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 electric...

Page 6: ...ge as marked on the Meter between the terminals or between any terminal and ground l The rotary switch should be placed in desired position prior to connecting leads This position should not be changed while leads are connected l When using the Meter at an effective voltage over 60V DC or 30V rms AC special care should be taken for there is danger of electric shock l Use the proper terminals funct...

Page 7: ...eter and turn the Meter power off before opening the Meter case 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 of the Meter when servicing No abrasive an...

Page 8: ...onal Electrical Symbols AC Alternating Current DC Direct Current Ground Double Insulated Low Battery Warning Refer to the Operating Manual Conforms to Standards of European Union Model 72 7930 OPERATING MANUAL 8 ...

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Page 13: ...µA mA A No Symbol Meaning 9 Ω kΩ MΩ mV V µF nF o F Fahrenheit temperature Model 72 7930 OPERATING MANUAL 13 ...

Page 14: ... 2V 20V 200V and 1000V Measurement Operation 1 A DC and AC Voltage Measurement see figure 3 To measure DC or AC Voltage connect the Meter as follows 1 Insert the red test lead into the HzVΩ terminal and the black test lead into the COM input terminal 2 Set the rotary switch to an appropriate measurement position in V or V range 3 Connect the test leads across with the object to be measured The mea...

Page 15: ... current measurement where the open circuit voltage between terminals and ground is greater than 250V If the fuse burns out during measurement the Meter may be damaged or the operator may be injured Measurement Operation 2 Model 72 7930 OPERATING MANUAL 15 ...

Page 16: ...rge all high voltage capacitors 2 Insert the red test lead into the A or mA terminal and the black test lead into the COM terminal 3 Set the rotary switch to an appropriate measurement position in A or A range 4 Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break 5 Turn on power to the c...

Page 17: ...tance black red figure 4 The resistance ranges are 200Ω 2kΩ 20kΩ 2MΩ and 20MΩ 1 Insert the red test lead into the Hz VΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Ω range 3 Connect the test leads across with the object being measured The measured value shows on the display Model 72 7930 OPERATING MANUAL 17 ...

Page 18: ...Y X accurate readings of resistance l If the input terminal short circuit reading 0 5 check the test leads for any looseness or other cause l For high resistance 1MΩ it may require several seconds to obtain a stable reading select short test leads for stable and precise readings l When the resistance is higher than the maximum range or in open circuit condition the Meter displays 1 l When resistan...

Page 19: ...gh 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 follows 1 Insert the red test lead into the Hz VΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch to 3 For forward voltage drop readings on any semiconductor component place ...

Page 20: ...cuit power and discharge all the high voltage capacitors before testing for continuity To test for continuity connect the Meter as below 1 Insert the red test lead into Hz VΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch to 3 Connect the test leads across with the object being measured 4 The buzzer does not sound if the resistance of a circuit under test is 100Ω Th...

Page 21: ...Model 72 7930 OPERATING MANUAL 21 To avoid personal injury F ...

Page 22: ...lue above 10 F To avoid personal injury or damage to the meter To ensure the highest level of accuracy the ambient temperature of the meter case should be between 64 740 F This is especially true with low temperature measure ment F F u F ...

Page 23: ...Model 72 7930 OPERATING MANUAL 23 F hFE To avoid personal injury and mA ...

Page 24: ...POWER Model 72 7930 OPERATING MANUAL 24 100 ...

Page 25: ...Model 72 7930 OPERATING MANUAL 25 ...

Page 26: ...Operating 0 o C 40 o C 32 o F 104 o F Storage 10 o C 50 o C 14 o F 122 o F l Relative Humidity l Electromagnetic Compatibility In a radio field of 1 V m Overall Accuracy Specified Accuracy 5 of Range in a radio field of more than 1 V m no assigned accuracy is specified l Battery Type One piece of 9V NEDA1604 or 6F22 or 006P l Dimensions 7 x 3 5 x 1 5 l Weight Approx 13 4 OE including holster and b...

Page 27: ... 1mV 10mV 100mV 1V Range Resolution 0 8 3 Overload Protection Accuracy 1 2 3 1000VAC Remarks l Input Impedance approx 10MΩ l Frequency response 40Hz 1kHz 500V 40Hz 400Hz 500V l Displays effective value of sine wave mean value response Accuracy Specifications 1 Accuracy specifications are guaranteed one year Operating temperature 18 o C 28 o C Relative humidity 75 RH Model 72 7930 OPERATING MANUAL ...

Page 28: ...20A Range For continuous measurement 10 seconds and interval time between 2 measurement greater than 15 minutes 2mA 200mA 20A 1µA 0 1mA 10mA Range Resolution 0 8 1 Overload Protection Accuracy 2 5 1 5 1 Un Fused 2mA 200mA 20A 1µA 0 1mA 10mA Range Resolution 1 0 3 Overload Protection Accuracy Un Fused 1 8 3 3 0 5 Fuse 0 5A 250V fast type 5x20mm CE Version Fuse 0 5A 250V fast type 5x20mm Model 72 79...

Page 29: ...Model 72 7930 OPERATING MANUAL 29 100 ...

Page 30: ...s 4 5 0 4 When it is 40µF the obtained reading is only for reference 2nF 1pF 200nF 0 1nF 100µF 0 1µF I Temperature Range Resolution Accuracy 4 0 3 Range Resolution Accuracy 0 400 o F 1 3 7 Model 72 7930 OPERATING MANUAL 30 F F F F F 1 440 ...

Page 31: ...s 5 J Transistor test Range Resolution Accuracy a reading b digits hFE 1β Vce 3V Ibo 10µA 1000βMAX K Frequency Range Resolution Overload Protection Accuracy 2kHz 1Hz 20kHz 10Hz 1 5 5 250V AC Model 72 7930 OPERATING MANUAL 31 ...

Page 32: ...th damp cloth and mild detergent Do not use chemical solvent l To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings l Turn the Meter off when it is not in use and take out the battery when not using for a long time l Do not store the Meter in place of humidity high temperature explosive inflammable and strong magnetic field B Replacing the ...

Page 33: ... screws and holster An open fuse is always the result of improper operation Maintenance 2 C Replacing the Battery see figure 10 To replace the Meter s battery 1 Turn the Meter power off and remove all connections from the terminals 2 Remove the holster from the Meter 3 Remove the 3 screws from the case bottom and separate the case top from the case bottom 4 Remove the battery from the battery conn...

Page 34: ... END This operating manual is subject to change without notice Model 72 7930 OPERATING MANUAL 34 ...

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Page 36: ...Copyright 2005 Tenma Test Equipment All rights reserved Tenma Test Equipment 405 S Pioneer Blvd Springboro Ohio 45066 www tenma com Model 72 7930 OPERATING MANUAL 36 ...