C703S 4-20mA Signal Generator Current Signal Generator, Multiple Signal Generator for PLC Testing
Introduction
In modern process control systems, reliable signal transmission is essential for accurate monitoring and stable operation. The C702S signal generator functions as both a signal source and measurement device, allowing technicians to simulate process signals and verify instrument response without requiring a live process.
The device supports voltage output, current loop simulation, and thermocouple signal generation, enabling testing of transmitters, controllers, PLC inputs, and other automation equipment. It also provides loop power supply capability, allowing direct testing of field transmitters without external power sources.
With programmable output modes such as linear sweep, stepping output, and segmented output, the instrument can simulate changing process conditions, helping users evaluate system response and calibration performance under controlled conditions.
Working principle
The C702S operates by generating stable electrical signals that replicate the output of industrial sensors and transmitters. These signals can then be applied directly to control systems, allowing verification of signal integrity and instrument response. Its working process includes three essential functions:
① Signal Output (Simulation)
The generator produces controlled electrical signals, including:
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DC voltage output up to 15 V
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Current output from 0 to 24 mA, including standard 4–20 mA signals
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Thermocouple signal simulation for multiple types (K, E, J, T, R, B, S, N)
These signals allow simulation of real process conditions, such as temperature and transmitter output.
② Signal Measurement (Verification)
The instrument can measure incoming voltage and current signals, allowing technicians to confirm whether transmitters and controllers are producing correct outputs. This enables effective troubleshooting and calibration verification.
③ Programmable Signal Output
The generator provides programmable output modes, including:
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Linear sweep output for gradual signal changes
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Step output for staged signal transitions
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Segmented output for customized signal simulation
These functions help test system performance under dynamic operating conditions.
Key features
The C702S signal generator combines accuracy, portability, and practical functionality to support reliable calibration and testing in industrial environments.
- Multifunction Signal Generation and Measurement: Supports output and measurement of voltage, current, and thermocouple signals, enabling verification of a wide range of industrial instruments.
- High Accuracy Signal Performance: Provides signal accuracy up to ±0.2% across supported ranges, helping ensure dependable calibration and reliable system verification.
- Standard 4–20 mA Loop Simulation: Simulates industry-standard current loops and supports passive current measurement, allowing effective testing of transmitters and control loops.
- Integrated Loop Power Supply: Provides 24 V loop power output, enabling direct testing of field transmitters without requiring an external power source.
- Programmable Output Functions: Includes sweep, step, and segmented output modes for dynamic signal simulation and functional testing of control systems.
- Portable and Field-Ready Design: Compact size, lightweight construction, and battery operation allow convenient use in field commissioning and maintenance environments.
Specification
| Product | Signal generator |
| Model | C703S |
| Operating temperature and humidity | -10~55℃, 20~80% RH |
| Storage temperature | -20-70℃ |
| Size | 115x71x30(mm) |
| Weight | 143g |
| Power | 4*AAA batteries or external 5 V/1A adapter |
| Power dissipation | About 200 mA; with power supplied by 4*AAA batteries ( each nominal capacity of 1100 mAh ), can be used for 4 hours with a full load and 17 hours standing by. |
| OCP | 30V |
Applications
The C702S signal generator is designed for calibration, testing, and troubleshooting tasks across industrial automation systems.
Instrument Calibration and Verification
Used to test and verify transmitters, signal converters, and controllers by simulating known electrical signals.
PLC and Control System Testing
Provides controlled signal input to PLC systems to verify input channel accuracy and response performance.
Field Maintenance and Troubleshooting
Helps identify signal faults, wiring problems, and instrument performance issues during maintenance operations.
Industrial Automation Commissioning
Supports system startup and commissioning by validating signal transmission and control system integration.
Laboratory Testing and Instrument Development
Provides reliable signal simulation for equipment testing and system validation in laboratory environments.
