YK-AMP70m3AT Automatic Range Ammeter 0~±70mA~±3A Dual Range Low Power Consumption Current Analyzer RS485 Interface

YK-AMP70m3AT Automatic Range Ammeter 0~±70mA~±3A Dual Range Low Power Consumption Current Analyzer RS485 Interface

Description:
- Traditional automatic current meter shifting: switching internal sampling resistors, switching instantaneously, either the equipment loses power or the impedance suddenly changes, which can easily cause the tested equipment to shut down or measurement to be inaccurate.
- Switching of this ammeter: the internal sampling circuit does not perform physical switching, and the software level implements shifting logic. Therefore, for the tested system, the measurement is continuous and smooth, and the power supply and current value of the tested system will not be affected by switching.
- It is very suitable for scenarios where low power consumption and operating current of devices need to be detected.
- The current meter adopts a high-precision reference + high-precision sampling resistor scheme, which measures accurately and has high resolution. Using high-precision small resistance sampling resistors, the input current has a maximum voltage drop of 38mV within a small range of 7mA; The input current has a maximum voltage drop of 380mV within a large range of 3A, with a small voltage drop and minimal impact on the measured system.
- Adopting a bipolar design scheme, it can measure bidirectional positive and negative currents without deliberately distinguishing the wiring, and can also measure currents normally.
- Equipped with anti reverse connection circuit, the module does not work when the power supply is reversed, but it will not cause damage to the circuit.
- Equipped with an overcurrent protection circuit, the input current of up to 7A will not cause damage to the circuit. When the current returns to within plus or minus 3A, the module immediately measures the current value normally without the need for a restart.
- The module integrates serial RS485 communication function, which can be read back by devices such as micro-controllers, computers (requiring USB to 485 modules), etc. The protocol adopts for Modbus protocol, making it convenient for large-scale integration and industrial applications.

Specification:
- Module type: current measurement meter (double range automatic switch)
- Power supply voltage: 5 - 30V
- Measuring range: double range (automatic range)
- Range 1:
  Range: 0 ~ ±70mA
  Display resolution: 0.1uA
  Measuring precision: 0.01% + 0.03%
- Range 2:
  Range: 0 ~ ±3A
  Display resolution: 0.1mA
  Measuring precision: 0.04% + 0.03%
- Note: At range 1, if the current exceeds 72mA, range 2 will be automatically used; At range 2, if the current is less than 65mA, range 1 will be automatically used.
- Power consumption: 24mA
- Anti-reverse connection protection: support, anti-reverse connection voltage <= 30V
- Input overcurrent protection: support, overcurrent absolute vale <= 7A
- Communication interface: RS485; 9600buad; 8bits; None parity; 1 Stop bit
- Communication protocol: for Modbus, support for 0X03, 0X06 commands
- Module weight: 25.2±1g
- Module size: 60 x 29 x 30mm
- Working temperature: -15 ~ +85℃

Precaution:
- Do not use a power supply that exceeds the nominal supply voltage range to power the module.
- When connected in reverse, the voltage should not exceed 30V;
- The module can withstand up to 7A overcurrent for a sustainable long-term (more than 1 hour); Can withstand a peak current of 10A (less than 50mS/second).

FAQ:
Q: What is the situation when the current measurement shows continuous drift?
A: When users receive the product for testing, they need to ensure the stability of the tested current in order to accurately measure the stability of this product. The common error operations currently collected include:
1. Using a battery string resistance scheme to provide the tested current: As the voltage of the battery gradually decreases during use, the generated current also gradually decreases, and the display naturally decreases (please use a stable power source to generate current for testing);
2. Using small package resistors or large resistance current limiting to generate current: Small package resistors often have low power and poor heat dissipation, and gradually become hot when passing through the current. The resistance value will drift with temperature drift, I=V/R, R drift, and I naturally drift. The principle of large resistance current is similar, for example, when the same 50mA test current is required, the larger the resistance value, the greater the power, and the faster the heating (it is recommended to use high-power small resistance current limiting resistors to generate current, such as 50W50 ohms or 50W50 ohms gold sealed resistors).

Q: Can battery power be used?
A: Sure. The module has a wide power supply voltage, and as long as the battery voltage is within the nominal power supply range of the module, battery power can be used.

Package Included:
- 1 x Ammeter

Note:
- Battery is not included.