Tenma 72-7780 Page 1 User Manual Download | Manualshive

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True

RMS

Digital

Multimeter

Model:

72

‐

7780

User

Manual

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2
3
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Summary of Contents for 72-7780

Page 1: ...True RMS Digital Multimeter Model 72 7780 User Manual ...

Page 2: ... 2 Do not use the device if the device or test leads appear damaged or if you suspect that the device is not operating properly Pay particular attention to the insulation layers 3 To avoid false reading replace the battery when the battery indicator appears 4 Functional dial should be switched to proper position 5 Never input voltage and current exceeding the value listed on the device 6 Do not sw...

Page 3: ...rs 1 Range Auto Manual 2 Polarity Auto 3 Display updates 2 3 times for every second Overrange Indicator OL 4 Operating temperature 0 C 40 C 32 F 104 F Storage temperature 10 C 50 C 14 F 122 F Relative humidity 75 at 0 C 30 C 50 at 30 C 40 C 5 Operating altitude 0 2000m 6 Battery type AA R6P 1 5V 2 7 Low power indicator 8 Dimension 175mm 80mm 48 5mm 9 Weight 350g batteries included 10 Electromagnet...

Page 4: ...t of resistance Hz kHz MHz Unit of frequency Unit of duty ratio mV V Unit of voltage μA mA A Unit of current nF μF mF Unit of capacitance C Celsius degree F Fahrenheit degree NCV Non contact voltage Auto shutdown Current clamp VIII Functional dial and buttons Position Note V V mV AC DC voltage Ω Resistance Diode Continuity Capacitance Hz Frequency Duty ratio C F Temperature μA mA A AC DC current 6...

Page 5: ...the button once to hold the reading Press again to unlock the reading and enter general measurement modes IX Operation instructions To avoid false reading replace the battery if the battery low power symbol appears Also pay special attention to the warning sign besides the test lead housing indicating that the tested voltage or current must not exceed the values listed on the device 1 AC DC voltag...

Page 6: ...ice before measuring continuity switch off all power supplies and fully discharge all capacitors Do not input voltage over DC 60V or AC30V 4 Diode measurement see figure 6 OL symbol appears when the diode is open or polarity is reversed For silicon PN junction normal value 500 800mV 0 5 0 8V Notes Switch off the power supply to the circuit and fully discharge all capacitors Voltage for testing dio...

Page 7: ...e The measured temperature should be less than 230 C 446 F F C 1 8 32 8 AC DC current measurement see figure 10 Connect test leads with the tested circuit in series Readings under this AC measurement is true RMS Notes Before measuring switch off the power supply of the circuit If the range of the measured current is unknown select the maximum range and then accordingly reduce There are fuses insid...

Page 8: ...l will disappear with one long beep Recover the auto off function by restarting the device Buzzer notification 1 Input voltage 600V AC DC buzzer will continuously beep indicating measure range is at limit 2 Input current 10A AC DC buzzer will continuously beep indicating measure range is at limit Low power warnings Voltage of the battery 2 4V symbol appears the device can still be used If voltage ...

Page 9: ...ee range 5 100 of the range shorted circuit allows least significant digit 10 Crest factor at Max range 3 0 excluding 600V range crest factor 1 5 Max input voltage 600Vrms 3 Resistance measurement Range Resolution Accuracy 600 0Ω 0 1Ω 1 0 2 6 000kΩ 0 001kΩ 0 8 2 60 00kΩ 0 01kΩ 600 0kΩ 0 1kΩ 6 000MΩ 0 001MΩ 1 2 3 60 00MΩ 0 01MΩ 1 5 5 Measurement result reading of resistor reading of shorted test le...

Page 10: ...or frequency measurement 100kHz Notes When measuring AC voltage or current following conditions should be satisfied Frequency response 1kHz AC voltage mV position 100mV V position Range 6 AC current input range 4000 6000μA 400 600mA 10A A range 6 400 600μA 40 60mA 4 6A A range 60 7 Temperature Range Resolution Accuracy C 40 1000 C 40 0 C 1 C 3 0 100 C 1 0 3 100 1000 C 2 0 3 F 40 1832 F 40 32 F 1 F...

Page 11: ...e opening the rear cover switch off the power supply remove test leads from the input terminal and the circuit 1 General maintenance 1 Clean the case with a damp cloth and detergent Do not use abradants or solvents 2 If there is any malfunction stop using the device and send it to maintenance 3 The maintenance and service must be implemented by qualified professionals or designated departments 2 R...

Page 12: ...e teat leads from the input terminal 2 Loosen the both screws on the rear cover and then remove the rear cover to replace the fuse Fuse specification F1 Fuse φ6 32mm FF 600mA H 600V F2 Fuse φ6 25mm FF 10A H 600V Tenma Test Equipment 405 S Pioneer Blvd Springboro Oh ...

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