KV-AMP700u 5-Digit Inline Ammeter DC Digital Ammeter ±700uA With Non-Isolated Interface For Modbus

KV-AMP700u 5-Digit Inline Ammeter DC Digital Ammeter ±700uA With Non-Isolated Interface For Modbus

Attention:
(1) The module interface of our store is clear and the performance is stable. Please use the information provided by our store to do functional verification under the corresponding experimental conditions.
(2) The basic parameters of this module are mentioned below, and a PDF file of module parameter index data is provided. Schematics and engineering files are not provided. If you have any operational problems, please consult customer service.
(3) Before using the module, please read the information of this module to understand the power supply and usage restrictions, so as to avoid damage to the module due to improper operation.
(4) All modules in our shop guarantee to provide real module parameters, functions and pictures. All modules have passed tests before delivery.

Description:
The current meter adopts a high-precision reference + high-precision sampling resistor scheme, which has accurate measurement and high resolution.

Using 100 ohm sampling resistor, the input voltage drop is only 70mV when the input current reaches 700uA, which has minimal impact on the measured system.

Using bipolar design, it can measure bidirectional positive and negative currents up to ±700uA, and the current can be measured normally without deliberately distinguishing the wiring.

With its own anti-reverse connection circuit, the module will not work when the power supply is reversed, but it will not cause damage to the circuit. With over-current protection circuit, input current up to 150mA will not cause damage to the circuit. When the current returns to ±700uA, the module will immediately measure the current value normally without restarting.

The module integrates serial communication function. The current data of the module can be read back by devices such as a MCU, a computer (USB-to-serial module required), etc. The protocol adopts the protocol for Modbus, which is convenient for large-scale integration and industrial applications.

Module Parameters:
- Module model: KV-AMP700u
- Module type: current measuring meter
- Power supply voltage: 4~30V
- Measuring range: 0 to ±700uA
- Input impedance: 100 ohm
- Product power consumption: 15mA (min: 14mA; typical: 15mA; max: 16mA)
- Display resolution: 10nA
- Measurement accuracy: 0.004%+0.01% [±(reading%+range%) (Tcal 23℃±5℃)]
- Reverse connection protection: Yes (reverse connection voltage <=30V)
- Input overcurrent protection: Yes (absolute value of overcurrent current <=150mA)
- Communication interface: UART_3.3V (9600Baud; 8Bits; None Parity; 1 Stop Bit)
- Communication protocol: For Modbus (support 0X03, 0X06 instructions)
- Module weight: 13.4±1g
- Module size: 29 x 48 x 22mm/1.1 x 1.9 x 0.9" (error ±1mm/±0.04")
- Working temperature: -15℃ to +85℃

Package Included:
- 1 x Set of Module

Note:
- Battery is not included.

Precautions:
(1) Please not use a power supply that exceeds the nominal power supply voltage range to supply power to the module.
(2) The voltage shall not exceed 30V during reverse connection.
(3) The module can withstand a long-term (more than 1 hour) overcurrent current of up to 150mA; can withstand a peak current of 180mA (less than 50mS per second). (The overcurrent input to the module that exceeds the nominal overcurrent may cause irreversible damage to the module.)

FAQ:
Q: Is there a higher precision or wider range current acquisition module?
A: All kinds of current and voltage acquisition modules in our shop are under development, including products with higher range and higher precision (to 1pA) are also on sale. We can also provide customers with customized functions and size customization services, please consult customer service for details.

Q: What is the status of the display drifting during current measurement?
A: When the user performs a test after receiving the product, he needs to ensure the stability of the current to be tested, so that the stability of the product can be accurately measured. The common error operations collected so far are:
1. The battery string resistance scheme is adopted to provide the current to be measured: As the voltage of the battery gradually decreases during use, the current generated gradually decreases, and the display naturally gradually decreases (please use a stable power supply to generate current for the test);
2. Use small package resistors or large resistance current limiting to generate current: small package resistors often have low power and poor heat dissipation, and will gradually become hot when passing current, and the resistance value will drift with temperature drift, I=V/R. The principle of large resistance current is similar. For example, when the current to be measured is also required to be 500uA, the greater the resistance, the greater the power and the faster the heating (it is recommended to use high-power and small-value resistors to limit current to generate current, such as 50W 50Ω or 50W 50Ω gold-sealed resistor).

Q: Can it be powered by batteries?
A: Yes. The module has a wide power supply voltage, as long as the battery voltage is within the nominal power supply range of the module, the battery can be used for power supply.