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- Page 2 Digital Multimeter – DM 81 User Manual General Instruction This meter DM-81 is 31/2 digital multi-function meter, which focus on large scale integrated circuit design and A/D converter, as well as full overload protection, meter can measure AC/DC voltage, AC/DC current, resistance, capacitance, diode forward voltage drop, transistor hFE parameter, the transmission signal detection of infrared remote controller (remote control) and live wire recognition.
- Page 3 Storage Temp.: -10℃ ～50℃ ; Humidity: <85% Accuracy Guaranty Temp.: 23℃±5℃; Humidity: <70% IV. Specifications DC Voltage Range Resolution Accuracy 200mV 0.1mV ±（1.2%+5） 10mV 200V 100mV 1000V ±（1.5%+5） -- Input Impendency: 1MΩ@200mV&2V, effective @10MΩ for other ranges -- Overload Protection: 250V for 200mV & 2V range, effective DC or AC 1000V for other ranges AC Voltage Range...
- Page 4 AC Current -- Overload Protection: 200mA/250V fuse, Range Resolution Accuracy 20A range without fuse 1μA ±（2%+5） -- Max Input Current: 20A (≤10 seconds) 200mA 100μA ±（2.5%+5） Measured by the voltage drop: full range 10mA ±（3%+7） as 200mV -- Frequency Range: 40Hz ~ 400Hz -- Response: average, calibrated in RMS of sine wave Resistance Range...
- Page 5 Diode and Continuity Test Range Description Measuring Condition Read approximate forward Forward DC current approx. as voltage of diode 1mA; Inverse DC voltage approx. as 2.8V Built-in buzzer will sound if Open circuit voltage resistance is less than 50Ω, approximate as 2.8V display resistance approximate value -- Overload Protection: 250V effective value...
- Page 6 Refer the Measuring DC Voltage a.b.d. means you can’t input the voltage more than 750V, it’s possible to show higher voltage, but it may destroy the inner circuit or pose a shock. Measuring DC Current 1> Connect the black test lead to COM jack, connect the red test lead to the mA jack once measuring current below 200mA and connect the red test lead to 20A jack once the measuring current is between 200mA to 20A.
- Page 7 When checking in-circuit resistance, be sure the circuit under test has all power removed and that all capacitors have been discharged fully. 200MΩrange short display appox.10 digits, measuring value = displayed value – 10 digits, eg. Measuring 100MΩ, displayed value is 101.0, then the correct value will be 101.0 –...
- Page 8 NOTE Continuity test is available to check open/short of the circuit. 10. Infrared Remote Control Transmitting Signal Detection( Set the rotary switch to and align the emitter head vertically in line with the infrared receiver, make sure the deviation is not more than±15 and the distance between (1-30 cm) and press the power button of remote controller.
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