4 Channel High-Speed 4-Wire Kelvin Resistance Measurement Module
Product No.: ZH-RI04
Measurement Range:1mΩ to 40kΩ
4 Independent Isolated Measurement Channels
2-Wire Resistance Measurement Supported
RS485 Modbus RTU Communication
4 Channel High-Speed 4-Wire Kelvin Resistance Measurement Module | 1mΩ Resolution | RS485 Modbus RTU/TCP
Description
The 4 Channel High-Speed High-Precision Resistance Measurement Module is designed for accurate low-resistance and high-precision resistance testing. Equipped with a 32-bit ADC and industrial-grade ARM MCU, the module supports both 4-wire Kelvin measurement and 2-wire measurement methods. Each measurement channel is fully isolated, ensuring reliable operation even when tested resistors share common terminals. With sampling rates as fast as 4ms and resolution down to 1mΩ, the module is ideal for battery manufacturing, cable testing, electronic component inspection, and industrial automation systems.
Key Features
1.4 Independent Isolated Measurement Channels
2.4-Wire Kelvin Resistance Measurement
3.2-Wire Resistance Measurement Supported
4.Resolution Down to 1mΩ
6.High-Speed Data Update as Fast as 4ms
7.32-bit High Precision ADC
8.ARM Industrial MCU Architecture
9.Dual Measurement Ranges Selectable
10.Custom Measurement Ranges Available
11.RS485 Modbus RTU Communication
12.Optional Ethernet Modbus TCP
13.Triple Isolation Design
14.DIN Rail Installation
Technical Specification
Item
Specification
Product Name
4 Channel High-Speed 4-Wire Resistance Measurement Module
Measurement Channels
4 Independent Isolated Channels
Measurement Method
4-Wire Kelvin Measurement / 2-Wire Measurement
ADC Type
32-bit High Precision ADC
Controller
ARM 32-bit Industrial MCU
Measurement Range
1mΩ to 40kΩ
Selectable Standard Ranges
1mΩ~1.5Ω or 1mΩ~200Ω
Custom Measurement Range
0.1× to 500× of 200Ω Range
Resolution
1mΩ
Accuracy
Minimum ±0.5mΩ
Temperature Drift
≤ ±25ppm/°C
Sampling Rate
4ms / 6ms / 10ms / 20ms Selectable
Excitation Current
Up to 9mA (Standard Range)
Excitation Voltage
Up to 4.7V
Power Supply
9~30VDC
Power Consumption
<4W (Ethernet Version)
Communication Interface
RS485 / Ethernet + RS485
Communication Protocol
Modbus RTU / Modbus TCP
Baud Rate
4800 / 9600 / 19200 / 38400 / 57600 / 115200 bps
Isolation Design
Power, Communication, Measurement Circuit Isolation
Channel Isolation
4 Channels Fully Isolated from Each Other
Isolation Voltage
>1500VDC
Operating Temperature
-40°C to +70°C
Mounting Method
35mm DIN Rail or Screw Mounting
Dimensions
115 × 90 × 40 mm
Screw Mounting Size
105 × 70 mm
Weight
Approx. 150g
Applications
1.Battery Internal Resistance Testing
2.Battery Pack Production Lines
3.Busbar Resistance Measurement
4.Welding Joint Resistance Inspection
5.Cable Resistance Testing
6.Connector Contact Resistance Testing
7.Motor Winding Resistance Measurement
8.Electronic Component Testing
9.Industrial Automation Systems
10.Laboratory Precision Measurement
11.Quality Control Systems
12.Smart Manufacturing Equipment
FAQ
1.What is a 4-wire resistance measurement module?
A 4-wire resistance measurement module uses the Kelvin measurement method to eliminate lead wire resistance errors and achieve highly accurate low-resistance measurements.
2.What is the minimum measurable resistance?
The module can accurately measure resistance values as low as 1mΩ.
3.Why use 4-wire measurement instead of 2-wire measurement?
4-wire measurement removes the influence of cable resistance and contact resistance, significantly improving measurement accuracy for low-resistance applications.
4.Are the channels isolated?
Yes. All four measurement channels are fully isolated from each other, as well as from the power supply and communication circuits.
5.What communication protocols are supported?
The module supports Modbus RTU via RS485 and optional Modbus TCP via Ethernet.
6.What industries commonly use this module?
Typical industries include battery manufacturing, automotive electronics, cable production, power equipment testing, industrial automation, and laboratory measurement.
7.Can custom resistance ranges be provided?
Yes. Custom measurement ranges can be configured from 0.1× to 500× the standard 200Ω range.
8.What is the fastest sampling speed?
The fastest configurable update rate is 4ms, making the module suitable for high-speed automated testing systems.
