Tenma 72-8720 Manual Download | Manualshive

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Model: 72-8720

Digital Bench Multimeter

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Summary of Contents for 72-8720

Page 1: ...1 Model 72 8720 Digital Bench Multimeter ...

Page 2: ... otherwise it may cause electrical shock or meter damage Take caution when voltages are above 60V DC and 30V AC rms Do not use the meter with the battery or fuse covers removed Do not adjust the range selector during measurement Replace the batteries as soon as the low battery indicator appears on the display Remove dead batteries from the meter or if it is not going to be used for a long time Nev...

Page 3: ...t In RECALL press to enable SEND feature In STORE press to switch between clearing or start storing reading from current index number REL Enter RELATIVE mode Upper right secondary display shows present value Lower right secondary display shows stored value Primary display shows present measurement minus stored value Press EXIT to quit mode Range Selector Positions Rotary Switch Function Blue SELEC...

Page 4: ...RMS value and AC DC OPERATING PARAMETERS FRONT PANEL LAYOUT Ambient temperature 0ºC 40ºC Relative humidity 75 0ºC 30ºC 50 31ºC 40ºC Maximum operating altitude 2000m Maximum Display Digital 5999 Measurement Speed Updates 2 3 times second Polarity display Automatic Turn the Range Selector to power the meter on and select a function The display initially shows a standard setup for that function Use t...

Page 5: ...o display 1000 ºF Tested ºF value No display 1832 DCμA Tested DCμA value N A Full range 400 4000 ACμA Tested ACμA value Tested frequency value 40kHz 100kHz Full range 400 4000 DCmA Tested DCmA value No display Full range 40 400 ACmA Tested ACmA value Tested frequency value 40kHz 100kHz Full range 400 4000 DCA Tested DC current value No display Full range 10 ACA Tested AC current value Tested frequ...

Page 6: ...eres unit of current Milliamp 1x10 3 or 0 001amperes Microamp 1x10 6 or 0 000001amperes F mF μF nF Farad unit of measurement Nanofarad 1x10 9 or 0 000000001 farads Microfarad 1x10 6 or 0 000001 farads Millifarad 1x10 3 or 0 001 farads Automatic power off feature is turned on Continuity test sounder STO Data store is on RCL Data recall is on Relative mode displays present value minus stored value A...

Page 7: ...meter has an input impedance of 10MΩ except 600mV range has 3000MΩ 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 Symbol Meaning LOW Indicates lowest setup limit AUTO The meter is set to auto range with range for best resolution selected SEND Data output in progress Backlight fea...

Page 8: ...an input impedance of 10MΩ except 600mV range has 3000MΩ 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 DC Millivoltage Measurement Warning To avoid damage to the meter please do not attempt to measure voltages higher than 400mV although readings may be obtained To measure DC Mil...

Page 9: ... DC button to measure AC DC current s true RMS Note If the value of current to be measured is unknown use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained Each measurement time of high current 5A should be less than 10 seconds and the interval time between 2 measurements should be greater than 15 minutes When current measurement is complet...

Page 10: ...1 2V When continuity testing has been completed disconnect the connection between the test leads and the circuit under test Note When measuring low resistances the test leads and internal wiring will add approximately 0 1 0 2Ω of error To obtain accurate readings in low resistance short circuit the test lead beforehand and record the reading obtained call this reading as X Then use the equation me...

Page 11: ...s cathode The measured value shows on the display Note Connect the test leads to the proper terminals as said above to avoid error display The LCD will display OL indicating diode being tested is open or polarity is reversed The unit of diode is Volt V displaying the forward voltage drop readings Open circuit voltage is around 2 7V When diode testing is completed disconnect the test leads from the...

Page 12: ...sure temperature ºC is default press SELECT to change to ºF The display shows OL initially Short the test leads to show room temperature Insert the point contact temperature probe into the corresponding Hz and COM terminal Note The Meter displays a fixed value which is the value of the meters own internal circuitry To ensure accuracy it is necessary to subtract this value from the displayed value ...

Page 13: ...tinuous measurement should be less than 10 seconds and interval between tests more than 15 minutes Do not attempt to measure higher than 10A When measurement has been completed disconnect the test leads from the circuit under test Place the temperature probe to the object being measured The measured value shows on the display after few seconds Note The testing environment must between 18ºC to 28ºC...

Page 14: ... To exit without storing the reading turn the meter off manually Automatic power off feature will be disabled after entering this mode Use the following procedure to recall the stored reading Press RECALL to recall the stored value and RECALL appears to confirm the operation The upper right secondary display shows the index number No xxxx The primary display shows the corresponding recalled data a...

Page 15: ...NGE Button Press RANGE to enter the manual ranging mode Press and hold RANGE for over 1 second to return to autoranging The MAX MIN Button MAX MIN recording mode captures and stores the maximum and minimum input value detected To use the MAX MIN mode as follows Press MAX MIN to display the highest reading MAX is shown on display Press MAX MIN again to display the lowest reading MIN is shown on dis...

Page 16: ...Hz 3 30 10kHz 20kHz 6 30 400V 0 01V 45Hz 1kHz 0 4 30 1kHz 10kHz 5 30 10kHz 100kHz Not Specified 1000V 0 1V 45Hz 1kHz 1 30 1kHz 5kHz 5 30 5kHz 10kHz 10 30 DC Current 400μA 0 01μA 0 1 15 Fuse 0 5A 250V fast type 5x20mm 4000μA 0 1μA 40mA 0 001mA 400mA 0 01mA 0 15 15 10A 0 001A 0 5 30 Fuse 10A 250V fast type 5x20mm AC Current 400μA 0 01μA 45Hz 1kHz 0 7 15 1kHz 5kHz 1 30 5kHz 10kHz 2 40 Fuse 0 5A 250V ...

Page 17: ...citance value of open circuit test leads 1000V rms 400nF 0 01nF 1 20 4μF 0 0001μF 40μF 0 001μF 400μF 0 01μF 1 2 20 4mF 0 0001mF 5 20 40mF 0 001mF Not Specified Frequency 40kHz 0 001kHz 0 01 8 1000V rms 400kHz 0 01Hz 4kHz 0 0001kHz 40kHz 0 001kHz 400kHz 0 01kHz 4MHz 0 0001MHz 40MHz 0 001MHz 400MHz 0 01MHz Not Specified Temperature ºC 0 1ºC 40ºC 40ºC 3 30 1000V rms 40ºC 400ºC 1 30 400ºC 1000ºC 2 5 º...

Page 18: ...s occasionally as dirt on the probes can affect reading accuracy Replacing the fuses Press the POWER button to turn the meter off disconnect the power cord and remove all connections from the terminals Fuse 3 Remove the screws from the power socket at the rear of the meter Remove the fuse by gently prying one end loose then take out the fuse from its holder Refit a replacement fuse Fuse 1 and 2 Op...

Page 19: ...Program you need the following hardware and software An IBM PC or equivalent computer with 80486 or higher processor and monitor with screen resolution of 600 x 800 pixels or better Microsoft Windows 95 or newer At least 8MB of RAM At least 8MB free hard drive space Access to a local or network CD ROM A free serial port A mouse or other pointing device supported by Windows Default of RS232C serial...

Page 20: ...s is required Do not dispose of these items with general household waste Separate for the treatment recovery and recycling of the materials used Waste batteries can be returned to any waste battery recycling point which are provided by most battery retailers Contact your local authority for details of the battery and WEEE recycling schemes available in your area Made in China PR2 9PP Man Rev 1 0 ...

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