8 Channel Resistance Measurement Module
Product No.: ZH-T08R
Measurement Range:20mΩ to 40MΩ
DIN Rail Installation
8 Independent Resistance Measurement Channels
Resolution up to 0.001Ω
8 Channel Resistance Measurement Module 20mΩ to 40MΩ RS485 Modbus RTU/TCP Resistance Acquisition Module
Description
The 8 Channel Resistance Measurement Module is a high-precision industrial resistance acquisition device featuring a 32-bit ADC and ARM-based MCU. It supports resistance measurement from 20mΩ to 40MΩ with up to 0.1% full-scale accuracy and 1mΩ resolution. Designed for industrial automation, quality control, sensor testing, and resistance monitoring applications, the module supports RS485 Modbus RTU and Modbus TCP communication with isolated power and communication interfaces for reliable operation in harsh industrial environments.
Key Features
1.8 Independent Resistance Measurement Channels
2.Wide Measurement Range from 20mΩ to 40MΩ
3.High Precision 32-bit ADC Architecture
4.Resolution up to 0.001Ω
5.Full Scale Accuracy up to 0.1%
6.Adjustable Sampling Rate (30ms–600ms)
7.Automatic and Fixed Range Selection
8.Common Point Measurement Mode
9.Line Resistance Compensation Function
10.Surge and Overvoltage Protection
11.Maximum Input Protection up to 60V
12.RS485 Modbus RTU Communication
13.Optional Ethernet Modbus TCP
14.Triple Isolation Protection Design
15.DIN Rail Installation
Technical Specification
Item
Specification
Product Name
8 Channel Resistance Measurement Module
Measurement Channels
8 Channels
Measurement Range
20mΩ to 40MΩ
ADC Resolution
32-bit High Precision ADC
Minimum Resolution
0.001Ω
Minimum Measurement Value
0.02Ω
Maximum Measurement Value
40MΩ
Measurement Accuracy
0.1% Full Scale
Minimum Error
0.01Ω
Temperature Drift
≤ ±30ppm/°C
Sampling Rate
30ms / 100ms / 300ms / 600ms Configurable
Measurement Modes
Auto Range / Fixed Range
Fixed Measurement Ranges
25Ω, 1kΩ, 5kΩ, 20kΩ, 100kΩ, 1MΩ, 10MΩ, 40MΩ
Auto Range
0.02Ω to 40MΩ
Line Resistance Compensation
Supported
Common Point Measurement Mode
Supported
Unused Channel Masking
Supported
Excitation Voltage
<2V (Low Resistance), <2.6V (High Resistance)
Excitation Current
<1mA
Input Protection
Surge and Overvoltage Protection
Maximum Input Voltage
60V
Power Supply
9~30VDC
Power Consumption
<1W (Without Ethernet), <3W (With Ethernet)
Communication Interface
RS485 / Ethernet + RS485
Communication Protocol
Modbus RTU / Modbus TCP
Baud Rate
4800, 9600, 19200, 38400, 57600, 115200 bps
Data Format
8 Data Bits, No/Odd/Even Parity, 1 or 2 Stop Bits
Isolation Protection
Power, Communication and Measurement Circuits Isolated
Isolation Voltage
>1500VDC
Operating Temperature
-40°C to +70°C
Mounting Method
35mm DIN Rail or Screw Mounting
Dimensions (L × W × H)
115 × 90 × 40 mm
Screw Mounting Size
105 × 70 mm
Weight
Approx. 150g
Applications
1.Precision Resistance Testing Systems
2.Production Line Quality Inspection
3.Sensor Resistance Monitoring
4.RTD Sensor Testing
5.Cable Resistance Measurement
6.Battery Internal Resistance Monitoring
7.Industrial Automation Systems
8.Electrical Component Testing
9.Laboratory Measurement Systems
10.Smart Manufacturing Equipment
FAQ
1.What is the measurement range of this resistance measurement module?
This module measures resistance values from 20mΩ (0.02Ω) to 40MΩ, making it suitable for both low-resistance and high-resistance testing applications.
2.How many resistance channels can be measured simultaneously?
The module provides 8 independent resistance measurement channels, allowing multiple sensors or components to be monitored through a single device.
3.What communication protocols are supported?
The module supports:
Modbus RTU over RS485
Modbus TCP over Ethernet (optional)
This enables easy integration with PLCs, SCADA systems, industrial PCs, and IoT gateways.
4.What is the measurement accuracy?
The module achieves:
Full-scale accuracy up to 0.1%
Resolution down to 0.001Ω
Temperature drift ≤ ±30ppm/°C
These specifications make it suitable for precision industrial measurements.
5.Does the module support automatic range switching?
Yes. The module supports both:
Automatic ranging from 20mΩ to 40MΩ
Fixed measurement ranges
Users can select the most appropriate mode according to the application.
6.What fixed measurement ranges are available?
The following fixed ranges are supported:
25Ω
1kΩ
5kΩ
20kΩ
100kΩ
1MΩ
10MΩ
40MΩ
7.Can multiple channels share a common connection point?
Yes. The module supports a Common Point Mode, allowing multiple resistors with one shared terminal to be measured without affecting measurement accuracy.
8.Does the module provide line resistance compensation?
Yes. Built-in line resistance compensation helps eliminate wiring resistance errors and improves overall measurement accuracy.
9.What protection features are included?
The module includes:
Surge protection
Overvoltage protection
Input voltage protection up to 60V
Isolation protection between power, communication, and measurement circuits
These protections improve system reliability in industrial environments.
10.What is the isolation voltage rating?
The isolation voltage exceeds 1500VDC, providing reliable protection against electrical interference and ground loops.
11.What power supply is required?
The module operates from a wide voltage range:
9VDC to 30VDC
making it compatible with most industrial power systems.
12.What industries typically use this module?
Typical applications include:
Industrial Automation
Sensor Testing
Cable Resistance Testing
Battery Manufacturing
Electronic Component Testing
Quality Control Systems
Smart Manufacturing
Laboratory Measurement Systems
Process Monitoring
Research and Development
13.Can this module be integrated with PLC systems?
Yes. The module is designed for seamless integration with:
PLC controllers
SCADA software
DCS systems
Industrial PCs
HMI systems
Industrial IoT platforms
using standard Modbus communication protocols.
