FNIRSI® SG-003A Signal Generator
Product Description
The FNIRSI® SG-003A Multi-functional Signal Generator is a portable industrial process signal generator and measurement instrument designed for testing, debugging, and maintenance of PLCs, process instrumentation, electric valves, and industrial automation systems.
The SG-003A supports multiple signal input and output types, including DC voltage, current, frequency, and PWM signals. It provides active current output, passive current (XMT) output, voltage output, 24V loop testing, and signal measurement functions, making it a versatile tool for industrial field technicians.
Featuring a 2.4-inch TFT color LCD with 240 × 320 resolution, the device displays input and output readings, signal modes, battery status, and real-time signal curves. Its physical-to-engineering quantity conversion function allows users to display signals in meaningful engineering units. For example, a 4–20mA signal can be mapped to an engineering range of 0–100.
The SG-003A also supports signal conversion between different input and output types, allowing an incoming signal to be converted into another signal format. For example, a 0–1000Hz frequency input can be converted into a 4–20mA current output.
Additional functions include four preset signal groups, programmable automatic output, real-time curves, output timing, and RS485 communication using the Modbus slave protocol. These functions make it useful for equipment commissioning, control-loop testing, troubleshooting, and industrial maintenance.
Powered by a built-in 3.7V 3000mAh rechargeable lithium battery and charged through a USB Type-C port, the SG-003A combines multiple process signal testing functions in a compact handheld design.
Key Features
- Multi-Functional Signal Generator: Combines signal generation, measurement, conversion, and 24V loop testing in one device.
- Active Current Output: Adjustable 0–24mA output for testing compatible industrial current-loop inputs.
- Passive Current (XMT) Output: Supports 0–24mA passive current output for compatible industrial control applications.
- Voltage Output: Adjustable 0–24V DC output.
- Frequency and PWM Output: Supports frequency generation, PWM duty-cycle adjustment, speed simulation, and quantitative pulse output.
- Current and Voltage Measurement: Measures current signals from 0–24mA and voltage signals from 0–30V.
- 24V Loop Detection: Provides 24V loop testing and current feedback measurement for compatible two-wire transmitters and industrial devices.
- 2.4-Inch TFT Color Display: 240 × 320 resolution screen with clear input and output readings.
- Engineering Quantity Display: Converts physical signal readings into corresponding engineering values using configurable linear ranges.
- Signal Conversion: Converts input signals into different output signal types, including frequency-to-current and voltage-to-current conversion.
- Four Preset Signal Groups: Stores commonly used signal values for quick recall.
- Programmable Automatic Output: Supports single-rise, single-fall, and cyclic output modes.
- Real-Time Signal Curves: Displays input and output signal trends with adjustable sampling intervals and automatic scaling.
- Output Timing: Automatically switches off the output after a configured output period.
- RS485 / Modbus Communication: Supports communication with compatible PLCs and configuration software using the Modbus slave protocol.
- USB Firmware Upgrade: Supports firmware updates through a USB-emulated storage interface.
- Rechargeable Battery: Built-in 3.7V 3000mAh lithium battery.
- USB Type-C Charging: Supports 5V charging through the Type-C port.
- Portable Design: Compact handheld enclosure suitable for industrial field work and maintenance.
Technical Specifications
General Specifications
| Parameter | Specification |
|---|---|
| Brand | FNIRSI |
| Model | SG-003A |
| Product Type | Multi-functional Process Signal Generator |
| Display | 2.4-inch TFT Full Color LCD |
| Display Resolution | 240 × 320 pixels |
| Battery | 3.7V Lithium Battery |
| Battery Capacity | 3000mAh |
| Charging Interface | USB Type-C |
| Charging Voltage | 5V |
| Dimensions | 82 × 27 × 112mm |
| Weight | 165g |
| Communication | RS485 / Modbus Slave |
| Firmware Upgrade | USB-emulated U Disk |
Signal Input Specifications
| Signal Type | Measurement Range | Resolution | Accuracy |
|---|---|---|---|
| Current Input | 0–24mA | 0.01mA | ±(0.1% + 0.005) |
| Voltage Input | 0–30V | 0.01V | ±(0.1% + 0.005) |
Signal Output Specifications
| Signal Type | Output Range | Resolution | Accuracy |
|---|---|---|---|
| Active Current Output | 0–24mA | 0.01mA | ±(0.1% + 0.005) |
| Passive Current (XMT) Output | 0–24mA | 0.01mA | ±(0.1% + 0.005) |
| Voltage Output | 0–24V | 0.01V | ±(0.1% + 0.005) |
| 24V Loop Current Detection | 0–24mA | 0.01mA | ±(0.1% + 0.005) |
| Frequency Output | 0–9999Hz | 5 digits | ±2% |
Frequency and PWM Functions
| Parameter | Specification |
|---|---|
| Frequency Output Modes | Frequency / PWM / Speed / Quantitative Pulse |
| Frequency Ranges | 0–99.999Hz / 0–999.99Hz / 0–9999Hz / 0–200kHz |
| PWM Parameters | Frequency and duty cycle |
| Maximum PWM Frequency | 9999Hz |
| Maximum Output Peak Level | 24V |
| Speed Simulation | Supports configurable pulses per revolution |
| Quantitative Pulse | Supports configurable pulse period and output count |
Additional Functional Specifications
| Function | Description |
|---|---|
| Preset Values | 4 groups |
| Programmable Output | Single rise / Single fall / Cycle |
| Programmable Output Cycles | 0–30,000; 0 represents infinite cycles |
| Signal Conversion | Input-to-output signal conversion |
| Engineering Quantity Display | Configurable linear signal-to-value mapping |
| Real-Time Curve | Input and output signal trend display |
| Output Timing | Automatic output shutdown after configured time |
| Communication Protocol | Modbus Slave |
| Communication Interface | RS485 |
| Firmware Update | USB-emulated storage |
Applications
- PLC Analog Input and Output Testing: Generate and measure voltage and current signals for checking compatible PLC analog channels.
- 4–20mA Current Loop Testing: Test industrial transmitters, controllers, and process instrumentation using standard current-loop signals.
- 0–10V and Voltage Signal Testing: Test compatible voltage-based analog input and output circuits.
- Industrial Process Instrumentation: Simulate and measure process signals used by industrial measurement and control equipment.
- Electric and Pneumatic Valve Testing: Test valve control signals and feedback loops using current, voltage, and programmable signal output.
- Two-Wire Transmitter Testing: Use the 24V loop function to supply compatible transmitters and measure their current feedback.
- Frequency and PWM Testing: Generate frequency and PWM signals for testing compatible control systems, speed inputs, and pulse-based devices.
- Signal Conversion and Simulation: Convert measured input signals into different output signal types for testing and troubleshooting.
- Industrial Equipment Commissioning: Verify signal paths and analog interfaces during installation and commissioning.
- Preventive Maintenance and Troubleshooting: Monitor input/output signals and use real-time curves to observe changes during equipment operation.
Frequently Asked Questions (FAQ)
1. What signals can the FNIRSI SG-003A generate?
The SG-003A supports active current output, passive current (XMT) output, DC voltage output, frequency output, and PWM signals. It also provides 24V loop testing and signal conversion functions.
2. Can the SG-003A generate standard 4–20mA signals?
Yes. The device supports current output from 0 to 24mA, which includes the standard 4–20mA industrial current-loop range. It also supports active and passive current output modes.
3. Can the FNIRSI SG-003A measure input signals?
Yes. It supports current measurement from 0 to 24mA and voltage measurement from 0 to 30V. These input functions allow technicians to monitor signals from compatible industrial equipment.
4. What is the purpose of the 24V loop detection function?
The 24V loop function can supply 24V to compatible devices while measuring the current feedback in the loop. It is useful for testing two-wire transmitters and certain pneumatic control valves. The manual describes two loop configurations and a separate independent 24V output function.
5. Does the SG-003A support frequency and PWM signal generation?
Yes. It supports frequency, PWM duty-cycle, speed simulation, and quantitative pulse modes. The frequency output ranges include 0–99.999Hz, 0–999.99Hz, 0–9999Hz, and 0–200kHz. The manual specifies a maximum PWM frequency of 9999Hz.
6. Can the device convert one signal type into another?
Yes. The signal conversion function maps an input signal range to a configured output signal range. For example, it can convert a 0–1000Hz frequency input into a 4–20mA current output.
7. Can the SG-003A communicate with a PLC or computer?
Yes. The SG-003A supports RS485 communication using the Modbus slave protocol, allowing communication with compatible PLCs and configuration software. It also supports firmware upgrades through its USB interface.
8. How is the FNIRSI SG-003A powered?
The device has a built-in 3.7V 3000mAh rechargeable lithium battery and charges through a USB Type-C port using a 5V supply. The manufacturer states an approximate full charging time of 4–6 hours and standby time of up to 26 hours. Actual operating time varies depending on usage.
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