Tenma 72-7740 Operating Manual Download Page 2

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Capacitance

Frequency & Duty Cycle

DC Current

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35

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AC Current

Maintenance

General Service

Testing the Fuses

Replacing the Battery

Replacing the Fuses

RS232C Serial Port

(Model 72-7745)

RS232C Port Cable

Setting of RS232C Serial Ports

System Requirements for

Installing the serial Interface Program

Diode Test

E.
F.
G.
H. Temperature

Model 72-7740/72-7745: OPERATING MANUAL

Summary of Contents for 72-7740

Page 1: ...ns Resistance Overview Safety Information Rotary Switch Functional Buttons Display Symbols Measurement Ranges A B Measurement Operation A B C D Testing for Continuity E F G H I Temperature Measurement J Operation of Hold Mode ThePOWER Button TheBLUE Button Sleep Mode Model 72 7740 only Accuracy Specifications A DC Voltage B AC Voltage C Selecting a Measurement Range Manual Ranging and Autoranging ...

Page 2: ...ance A General Service B Testing the Fuses C Replacing the Battery D Replacing the Fuses RS232C Serial Port Model 72 7745 A RS232C Port Cable B Setting of RS232C Serial Ports C System Requirements for Installing the serial Interface Program Diode Test I E F G H Temperature Model 72 7740 72 7745 OPERATING MANUAL ...

Page 3: ...hock or personal injury read the Safety Information and Rules for Safe Operation carefully before using the Meter Digital Multimeter Model 72 7740 hereafter referred to as the Meter have autorange and manual range options with maximum reading 3999 The enclosure structure design adopted advanced co injection technique in order to provide sufficient insulation Model 72 7740 72 7745 OPERATING MANUAL ...

Page 4: ... category CAT III 1000V CAT IV 600V and double insulation 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 equipmen...

Page 5: ...ment to prevent damage of the Meter l When working at an effective voltage over 60V DC or 30V rms AC special care should be taken there is danger of electric shock l Use the proper terminals function and range for your measurements l Do not use or store the Meter in an environment of high temperature humidity explosive flammable and strong magnetic field The performance of the Meter may deteriorat...

Page 6: ...c discharge the Meter may not be operated as normal condition The user may require resetting the Meter Remove the battery when not used for a prolonged period to avoid damage to the Meter Please constantly check the battery as it may leak when it has been using for some time replace the battery as soon as leaking appears A leaking battery will damage the Meter 6 International Electrical Symbols AC...

Page 7: ... frequency duty cycle resistance diode continuity and capacitance measurements 5 COM Input Terminal Return terminal for all measurements Input Terminal Input for 0 1 A to 400 0mA current measurements and temperature testing 7 10A Input Terminal Input for 0 01A to 10 00A current measurements 7 Model 72 7740 72 7745 OPERATING MANUAL ...

Page 8: ...ment range from 4 000V to 750 0V Continuity test Diode test Resistance measurement range from 400 0 Temperature in celsius Hz Frequency measurement range from 10 00Hz to 10 00MHz AC or DC current measurement range from A mA AC or DC current measurement range from 40 00mA to 400 0mA A AC or DC current measurement range from 4 000A to 10 00A to 40 00M Model 72 7740 72 7745 OPERATING MANUAL ...

Page 9: ...hes between continuity and diode and resistance and capacitance measurements the Meter beeps Resistance is default Switches between AC and DC current range from 400 0 A to 4000 A the Meter beeps DC is default mA Switches between AC and DC current range from 40 00mA to 400 0mA the Meter beeps DC is default A Switches between AC and DC current range from 4 000A to 10 00A the Meter beeps DC is defaul...

Page 10: ... to enter duty cycle mode the Meter beeps 3 Press again to return to the frequency counter mode the Meter beeps Hz V mA or A 1 Press to start the frequency counter the Meter beeps 2 Press again to enter duty cycle mode the Meter beeps 3 Press again to return to the previous measurement mode the Meter beeps REL Any rotary switch position except Hz Press to enter and exit the REL mode in any measuri...

Page 11: ...he LCD but data output is only in progress when the Meter is connected to the computer via the included RS232C Interface Cable 5 Percent Used for duty cycle measurements 6 Data hold is active 7 The REL is on to display the present value minus the stored value 8 The battery is low Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as s...

Page 12: ...Microamp 1x 10 or 0 000001 amperes 17 Indicates negative reading 18 The input value is too large for the selected range Measurement Ranges 1 The Meter has both manual range and autorange options 12 Display Symbols 1 see figure 2 A measurement range determines the highest value the Meter can measure Most Meter functions have more than one range See Accuracy Specifications A Selecting a Measurement ...

Page 13: ...and exit the manual range mode 1 Press RANGE The Meter enters the manual range mode and turns off Pressing RANGE increments the range When the highest range is reached the Meter wraps to the lowest range Measurement Ranges 2 Note l If you manually change the measurement range after entering the REL or Hold recording modes the Meter exits these modes l Under frequency duty cycle and capacitance mea...

Page 14: ...y switch to DC measurement is default or press BLUE button to select DC measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display Note l In each range the Meter has an input impedance of 10M This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10k the error is negl...

Page 15: ...lect AC measurement 3 Connect the test leads across with the object being measured The measured value shows on the display Note l In each range the Meter has an input impedance of 10M This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10k the error is negligible 0 1 or less l When AC voltage measurement has been completed d...

Page 16: ...t the rotary switch to resistance measurement is default or pressBLUE button to select measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display 16 capacitors before measuring resistance Note l The test leads can add 0 1 to 0 2 of error to resistance measurement To obtain precision readings in low resistance measurement that is the rang...

Page 17: ... the test leadsfrom the input terminals of the Meter D Testing for Continuity see figure 6 Measurement Operation 4 figure 6 To avoid damage to the Meter or to the device under test disconnect circuit 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 theHzV terminal and the black test l...

Page 18: ...connection between the test leads and the circuit under test and remove the test leads from the input terminals of the Meter 3 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 The measured value shows on the display Note l In a circuit a good diode should still produce a forwar...

Page 19: ...e testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter figure 8 Warning Insert the red test lead into theHzV terminalandthe blacktest lead into the COM terminal 2 Set the rotary switch to measurement mode and press BLUE button to select nF 3 Connect the test leads across with the object being measured The measured value shows on the displ...

Page 20: ...ed or it exceeds the maximum range l When capacitance measurement has been completed disconnect the connection between the test leads and the circuit under test and remove the test leads from the The measured value shows on the display The measurement range is from 10Hz to 10MHz To measure frequency connect the Meter as follows 1 Insert the red test lead into theHzV terminal and the black test lea...

Page 21: ...signal Set the rotary switch to V Then press Hz to select measurement mode to obtain duty cycle value When input scope 30V rms please follow the above step 2 carrying out the measurement H Measuring Duty Cycle See figure 9 The duty cycle measurement range is 0 1 99 9 To measure duty cycle do the following 1 Set up the Meter to measure frequency 2 To select duty cycle press Hz until the symbol is s...

Page 22: ...r the operator may be injured Use proper terminals function and range for the measurement When the test leads are connected to the current terminals do not parallel them across any circuit Warning J DC or AC Current Measurement see figure 11 Note l The Meter automatically displays the temperature value inside the Meter when there is no temperature probe connection l The included point contact temp...

Page 23: ...ive value of sine wave mean value response Model 72 7745 AC current is displayed as true rms value 5 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 6 Turn on power to the circuit The measured value shows on the display l For safety sake each measurement time for high current should ...

Page 24: ...fore selectingREL If measurement function changes manually after REL is selected the Meter exits the REL mode l PressREL to enter REL mode auto ranging turns off except under capacitance testing mode and the present measurement range is locked and display 0 as the stored value l PressREL again or turn the rotary switch to reset the stored value and exit REL mode The Use of Relative Value Mode The ...

Page 25: ...eadings in insufficient light or poor vision please use Display Backlight function l Press and hold HOLD H for over 2 seconds to turn the Display Backlight on l Pressand holdHOLD H again for over 2 seconds to turn the Display Backlight off otherwise it will stay on continuously Sleep Mode Model 72 7740 To preserve battery life the Meter automatically turns off after 30 minutes of inactivity To dis...

Page 26: ... fast type 5x20mm Glass fuse 0 5A 250V fast type 5x20mm l Maximum Display Digital 3999 l Measurement Speed Updates 3 times second l l Relative Humidity l Altitude Operating 2000 m Storage 10000 m l Battery Type One piece of 9V NEDA1604 or 6F22 or 006P l Low Battery Display l Dimensions HxWxL 177 x 85 x 40 mm l Weight Approximate 300g battery included l Safety Compliances IEC61010 CAT III 1000V CAT...

Page 27: ... 4k 40k 10 400k 100 4M 1k Accuracy Specifications 1 Remarks Input impedance C Resistance Range Resolution Accuracy Overload Protection 1 2 1 2 2 1 5 2 1000Vp Remarks Open circuit voltage approximate 0 45V 40M 10k Measure at REL mode 1 2 2 B AC Voltage Range Resolution Accuracy Overload Protection 4V 40V 400V 1 5 750V 1V 1 2 5 1000V DC 750V AC rms continuous Remarks l Input impedance 10M l Model 72...

Page 28: ... Displays approximate forward voltage drop reading 0 5V 0 8V F Capacitance Resolution Accuracy Overload Protection Measure at REL mode 3 10 3 5 4 5 1000Vp G Frequency Duty Cycle Range Resolution Accuracy Overload Protection 10Hz 10MHz 0 1 99 9 0 01 1000Vp Remarks l 10Hz 10MHz Range l 0 1 99 9 Reading is only for reference purpose Accuracy Specifications 2 300mV rms input sensitivity 30V rms 600mV ...

Page 29: ...5 minutes I DC Current Glass fuse 0 5A 250V fast type Glass fuse 5x20 mm Glass fuse 10A 250V fast type Glass fuse 5x20 mm Overload Protection Glass fuse 0 5A 250V fast type 5x20mm Remarks Accuracy Specifications 3 400 A 0 1 A l 4A 10A Range 29 Model 72 7740 72 7745 OPERATING MANUAL ...

Page 30: ...ecifications 4 J AC Current 400 A 0 1 A 30 and interval not less than 15 minutes Remarks Model 72 7740 displays effective value of sine wave mean value response Model 72 7745 displays true rms value l 4A 10A Range For continuous measurement 10 seconds Model 72 7740 72 7745 OPERATING MANUAL ...

Page 31: ...th detergent as dirt or moisture in the terminals can affect readings l Turn off the power of the Meter when it is not in use and take out the battery when not using for a long time Take out the battery when it is using for a long time l Do not use or store the Meter in a place of humidity high temperature explosive inflammable and strong magnetic B Testing the Fuses fuses with identical amperage ...

Page 32: ...R to turn the Meter off and remove all connections from the terminals Remove the screw from the battery compartment and separate the battery compartment from the case bottom Remove the battery from the battery compartment Replace the battery with a new 9V battery NEDA1604 6F22 or 006P Rejoin the case bottom and battery compartment and reinstall the screw Warning l If the Meter beeps the fuse is go...

Page 33: ...ls Remove the screw from the battery compartment and separate the battery compartment from the case bottom Remove the 2 rubber feet and 2 screws from the case bottom and separate the case top from the case bottom Remove the fuse by gently prying one end loose then take out the fuse from its bracket Install ONLY replacement fuses with the identical type and specification as follows and make sure th...

Page 34: ...t of the fuses is seldom required Burning of a fuse 6 7 Rejoin the case bottom and case top and reinstall the 2 screws and 2 rubber feet Rejoin the battery compartment and the case top and reinstall the screw 34 Model 72 7740 72 7745 OPERATING MANUAL ...

Page 35: ...35 Tenm a Test Eq u ip me n t 405 S Pio n e e r Blvd Spr ingboro Oh io 4 5 0 6 6 www t enma co m Model 72 7740 72 7745 OPERATING MANUAL ...

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