DC0-100V 1A 50A LED DC dual display digital current voltmeter digital headBaby Description: High precision, high reliability, suitable for high-end applications With reverse connection protection, reverse connection does not burn.10A voltage ammeter head itself has a built-in shunt, shunt (note that the shunt must be connected before connecting the power supply)Note: Gauges with a range of 50A or 100A, regardless of whether the measured current is less than 10A, must be connected to the shunt to measure the current! Otherwise it will burn the watch head.The voltage is normal and the current is 0.00 or 0.0Make sure the thick black line is connected to the negative terminal of the battery and the thick red line is connected to the negative terminal of the load. (Note that the wiring of discharge and charge is not the same, see the concept of load and power after Z). (The watch head uses the original imported chip, which has undergone very strict testing and calibration when leaving the factory. There is no quality problem before the factory. When the current display is 0, 99.99% is wrong wiring, please check the wiring carefully and patiently.Inaccurate current displayIf the power supply is directly supplied or the power supply is in common with the equipment power supply, just disconnect the thin black line to be accurate.No display when connected to the power supplyAll AC rectified electricity must be connected to an electrolytic capacitor filter above 1000uF to supply power to the meter head.Judge the head is good or bad (the following are two cases of normal head)Do not connect the shunt, connect the fine red line and the fine black line to the power supply, the current display of the meter head with a range of 50A is 50.0~59.9, and the meter head with a range of 100A is 100~109;Connect the shunt, connect the thin red line and thin black line to the power supply, the current display of the 50A meter head is 0.00, and the 100A meter head is 0.0;Other considerationsThe current can only be measured at the negative end of the power supply and the negative end of the load.Voltage range: The power supply voltage range of the 5-wire meter head is 4~28V, that is, the voltage of the fine red line can not exceed 28V.Concepts about loads and power suppliesWhen discharging: battery, switching power supply, transformer is the power supply, resistor, lamp, motor, electrical equipment is the load.When charging: charger, generator, solar energy is the power supply, rechargeable battery, battery is the load.Package content: 1* Red and blue 50A (adjustable dual potentiometer)