Mini Digital Voltmeter Ammeter DC 0-100V1A 10A 50A 100A LED DC dual display digital current and voltmeter Digital meter

Baby description:
● High precision, high reliability, suitable for high-end applications
● With reverse connection protection, no burning if connected reversely.
Please have a certain basic knowledge of electronics when buying electronic components. Before buying, please read the information provided in the description. All products do not provide technical support. Please do not buy if you don’t know how to use it. Please consider carefully before buying! ! !
The power supply voltage of the meter must be 4--30V. If it exceeds 30V, independent power supply is required. Please connect according to the diagram. The four points of the shunt cannot be changed at will!!!
Baby description:
● High precision, high reliability, suitable for high-end applications
● With reverse connection protection, no burning if connected reversely.
technical parameter:
Voltage measurement range
0.0V-100V
Current test range
0-999mA, 0-10A, 0-50A, 0-100A (4 ranges are optional)
Power supply range
DC4-30.0V
Voltage error
0.1%
Current error
1%
External shunt specifications
75 milliohms
Working current
<20mA
Refresh rate
About 300mS once
Display method
Dual three-digit 0.28" LED digital tube
Display color
Red + red, red + blue. Optional
Lead length
15cm
Dimensions：48 x 29 x 22 mm, length X width X thickness;
Mounting holes：46 x 27 mm
Operating temperature：-10℃~65℃

Note: For a meter with a range of 50A or 100A, no matter whether the measured current is less than 10A, a shunt must be connected to measure the current! Otherwise, the meter head will be burnt.
Voltage display is normal, current display 0.00 or 0.0
Make sure that the thick black wire is connected to the negative terminal of the battery and the thick red wire is connected to the negative terminal of the load. (Note that the wiring of discharging and charging is not the same, see the concept of load and power supply after.). (The meter head uses the original imported chip, which has undergone very strict testing and calibration before leaving the factory. It is guaranteed. There is no quality problem before leaving the factory. 99.99% of the current display is 0 because the wiring is incorrect. Please check the wiring patiently and carefully)
Inaccurate current display
If it is directly powered or the independent power supply and the equipment power supply share the same ground, just disconnect the thin black wire to be accurate.
No display when connected to power
All the rectified AC power must be filtered by an electrolytic capacitor above 1000uF before it can supply power to the meter.
Judge whether the header is good or not (the following are two cases of normal header)
Without the shunt, connect the thin red wire and thin black wire to the power supply. The current of the meter with a range of 50A displays 50.0~59.9, and the meter with a range of 100A displays 100~109;
Connect the shunt, connect the thin red wire and thin black wire to the power supply, the current of the meter with a range of 50A displays 0.00, and the meter with a range of 100A displays 0.0;
Other matters needing attention
The measured current can only be connected to the negative pole of the power supply and the negative pole of the load.
Voltage range: The power supply voltage range of the 5-wire meter head is 4~28V, that is, the voltage connected to the thin red wire cannot exceed 28V.
About the concept of load and power supply
When discharging: batteries, switching power supplies, and transformers are power sources, and resistors, lights, motors, and electrical equipment are loads.
When charging: chargers, generators, and solar energy are power sources, and rechargeable batteries and accumulators are loads.