Features:The meter head is a common design, i. e. the ground wire at the measuring end is interlinked with the ground wire at the power supply end (except the isolation meter).This meter has strong anti-interference ability and fast display refresh rate.The meter head uses a wide power supply range: DC3.5 ~ 30V (except the isolation meter), the power supply reverse connection will not burn.Specification:Voltage Measuring Range0~99.9VResolution0.01V(<10v)/0.1v(10~100V)Ampere Measuring Range0-9.99-20AResoluction0.01A(<10A)/0.1A(>10A)Measurement rate 500mS/ timesMeasurement accuracy1% ( 1 word)Minimum supply voltage+3.5VMaximum supply voltage+ 30VOperating temperature-10 ~ + 65Working humidity10 ~ 80% (without condensation)Working pressure80 ~ 106 kPaSunlight exposureno direct exposureNote:The watch head of 20A _ built-in shuntIn the following cases, it is strongly recommended that: isolation meter (isolation power supply meter)When two or more meters are installed in a device, they cannot be alone, independent, or isolated when power is suppliedConnection method:This meter is equipped with five lines, please find professionals strictly according to the following wiring diagram, if any questions, please feel free to contact customer service:Meter head power supply: two-wire socketFine _ black line: meter head power supplyIsolation meter (isolated power supply):The meter head power supply end and the test end are completely insulated and isolated from each other, can share one power source in multiple meters, "no need" is worried about all kinds of interference problems caused by sharing the power supply, suitable for the factory aging test stand, test stand, or other equipment requiring more than one meter headTest end:COM: Test Common EndA +: Test "positive" current input end;Because the meter head adopts the common ground design, that is, the ground wire at the measuring end is connected with the ground wire at the power supply end, so it can only be connected between the negative and the negative power supply of the equipment under test, as shown in the following figure, the connection error will burn, (if only do voltmeter use, it is recommended to connect the yellow line with the black line, Prevent the digital flicker of ammeter caused by external interference)Non-shunt _ connection method: suitable for "below 20A" without external connection.