Module Parameter

Supply voltage: DC4V-30.0V

Current testing range: 0-50A Voltage measurement range: 0.0V-100V

Voltage error: ± 1%

Current error: ± 2%

Working current:< 20MA

Refresh speed: approximately 620MS per refresh

Display mode: Double three digit 0.28 "LED digital tube

Display colors: red+red, red+blue. Optional

Lead length: 15CM

Dimensions: 48X29X22MM, length X width X thickness;

Installation hole: 46X27 MM

Working temperature:- 10°C~65°C

Product Features

High precision, high reliability.

It has reverse connection protection and does not burn when connected in reverse.

Directly use without manual calibration.

Pin Description

a. +(indicated by the small red line): Positive pole of the power supply terminal (connected to the positive pole of the DC power supply)

b. - (indicated by a small black line): Negative value at the power supply end (negative value when connected to a DC power supply)

c. V (indicated by a small yellow line): The positive pole of the tested power supply (connected to the positive pole of the power supply to be tested)

d. The thick red line drawn out: connected to the negative pole of the load

e. The thick black wire drawn out: connected to the negative terminal of the tested power supply

Product Instructions

1. Precautions before use

The power supply voltage of the product must be 4~30V. The test current range is 0~50A. Please wire according to the diagram

2. Wiring method

There are four types of this module, each with a different current measurement range. The current measurement range of this HW-811-A module is 0A -50A, so it needs to be connected to a shunt for measurement!! There are two types of wiring methods for this type.

3. Problem explanation during the usage process:

a. Voltage display is normal, current display is 0.00 or 0.0

Ensure that 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 for discharging and charging is different, see the concepts of load and power supply at the end). (The header uses original imported chips, which undergo very strict testing and calibration before leaving the factory to ensure 100% quality issues. 99.99% of cases where the current displays 0 are due to incorrect wiring, please be patient and carefully check the wiring.)

b. Inaccurate current display

If it is a direct or independent power supply and the equipment power supply are grounded, simply disconnect the thin black wire to achieve accuracy.

C. No display when connected to the power supply

Any AC power that has been rectified must be filtered by an electrolytic capacitor with a capacitance of at least 1000uF before it can be supplied to the meter head.

d. Judging the quality of the header (the following are two situations of normal headers)

Do not connect the shunt, connect the thin red and black wires to the power supply. The current displayed on the meter with a range of 10A is 10.0~19.9, and the current displayed on the meter with a range of 100A is 100~109;

Connect the shunt, connect the thin red and black wires to the power supply. The current displayed on the meter with a range of 10A is 0.00, and the current displayed on the meter with a range of 100A is 0.0;

e. Other precautions:

Current measurement can only be connected in series between the negative pole of the power supply and the negative pole of the load.

Voltage range: The power supply voltage range for the 5-wire header is 4-28V, which means that the voltage for the thin red wire connection cannot exceed 28V.

f. Regarding the concepts of load and power supply:

During discharge: The battery, switch power supply, and transformer are the power sources, while the anode, lamp, motor, and electrical equipment are the loads.

When charging: The charger, generator, and solar energy are the power sources, while the charging battery and accumulator are the loads.

Attention: The measuring range is 10A. Regardless of whether the measured current is less than 10A, a shunt must be connected to measure the current! Otherwise, it will burn out the header.

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