FNIRSI® SG-004A Multi-functional Signal Generator
Product Description
The FNIRSI® SG-004A Multi-functional Signal Generator is a portable industrial process signal generator and measurement instrument designed for testing, calibration, troubleshooting, and commissioning of industrial automation and control systems.
The SG-004A supports a wide range of signal types, including DC current, voltage, frequency, millivolt, thermocouple, and resistance signals. It provides active current output, passive current (XMT) output, voltage output, frequency and PWM generation, thermocouple simulation, resistance simulation, and 24V loop detection.
With its 2.4-inch TFT color display, the SG-004A shows input and output values, signal modes, and real-time signal curves. Its engineering quantity conversion function allows users to display measured or generated signals as corresponding physical values. For example, a 4–20mA signal can be mapped to an engineering range of 0–100.
The device also features signal conversion, four preset signal groups, programmable automatic output, historical data recording, output timing, and RS485 communication using the Modbus slave protocol. These functions make it suitable for PLC system debugging, valve positioner adjustment, instrument testing, process control simulation, and inverter testing.
The SG-004A includes a built-in 3000mAh rechargeable lithium battery and a USB Type-C charging interface supporting 5–12V input and up to 10W charging power. Its compact handheld design makes it practical for industrial field testing and maintenance.
Key Features
- Multi-functional Signal Generation and Measurement: Supports current, voltage, frequency, millivolt, thermocouple, and resistance signal modes.
- Active Current Output: Adjustable 0–24mA output for testing compatible industrial current-loop inputs.
- Passive Current (XMT) Output: Supports 0–24mA passive current output.
- Voltage Output: Adjustable 0–24V DC output.
- Frequency and PWM Functions: Supports frequency generation, PWM duty-cycle control, speed simulation, and quantitative pulse output.
- Millivolt Signal Output: Supports -10mV to 100mV signal range.
- Thermocouple Simulation: Supports S, B, E, K, R, J, T, N, WRe3/25, and WRe5/26 thermocouple types.
- Resistance and RTD Functions: Supports resistance simulation and measurement, including Pt100 and Cu50 temperature sensors.
- 24V Loop Detection: Provides 24V loop testing with current feedback measurement for compatible two-wire transmitters and pneumatic control valves.
- Independent 24V Power Supply: The IN− terminal can be configured as an independent 24V output.
- 2.4-Inch TFT Color Display: Provides clear readings and signal information with an illuminated display.
- Engineering Quantity Conversion: Converts signal values into corresponding physical or engineering values using configurable linear ranges.
- Signal Conversion: Converts input signals into different output signal types, such as frequency-to-current conversion.
- Four Preset Signal Groups: Stores commonly used signal values for quick recall.
- Programmable Automatic Output: Supports monotonic increasing, monotonic decreasing, and cyclic output modes.
- Real-Time Signal Curves: Displays input and output signal trends with adjustable sampling intervals and automatic scaling.
- Historical Data Recording: Records and allows users to review stored signal data.
- Output Timing: Automatically switches off the output after a configured 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 5–12V input and up to 10W charging power.
Technical Specifications
General Specifications
| Parameter | Specification |
|---|---|
| Brand | FNIRSI |
| Model | SG-004A |
| Product Type | Multi-functional Signal Generator |
| Display | 2.4-inch TFT Full-Color LCD |
| Battery | 3.7V Rechargeable Lithium Battery |
| Battery Capacity | 3000mAh |
| Charging Interface | USB Type-C |
| Charging Input | 5–12V DC |
| Maximum Charging Power | 10W |
| Standby Time | Up to 24 hours |
| Dimensions | 82 × 27 × 112mm |
| Weight | Approximately 50g |
| Communication | RS485 / Modbus Slave |
| Firmware Upgrade | USB-emulated U Disk |
Current, Voltage, and Loop Signal Specifications
| Signal Type | Range | Accuracy | Resolution | Impedance / Load |
|---|---|---|---|---|
| Current (mA) | 0–24mA | ±(0.02% + 0.003) | 0.001mA | 100Ω |
| Voltage (V) | 0–24V | ±(0.02% + 0.003) | 0.001V | 500kΩ |
| Passive Current (XMT) | 0–24mA | ±(0.02% + 0.003) | 0.001mA | 100Ω |
| 24V Loop | 0–24mA | ±(0.1% + 0.005) | 0.01mA | 100Ω |
Frequency and Millivolt Signal Specifications
| Signal Type | Range | Accuracy | Resolution | Impedance |
|---|---|---|---|---|
| Frequency (Hz) | 0–9999Hz | ±2% | 5 digits | 1MΩ |
| Millivolt (mV) | -10 to 100mV | ±(0.03% + 0.03) | 0.01mV | 2kΩ |
Thermocouple Signal Specifications
| Thermocouple Type | Temperature Range | Accuracy | Resolution |
|---|---|---|---|
| S | 0–1760°C | ±(0.2% + 1) | 1°C |
| B | 0–1810°C | ±(0.5% + 1) | 1°C |
| E | 0–990°C | ±(0.2% + 1) | 1°C |
| K | 0–1320°C | ±(0.2% + 1) | 1°C |
| R | 0–1760°C | ±(0.3% + 1) | 1°C |
| J | 0–1190°C | ±(0.3% + 1) | 1°C |
| T | 0–390°C | ±(0.2% + 1) | 1°C |
| N | 0–1290°C | ±(0.2% + 1) | 1°C |
| WRe3/25 | 0–2320°C | ±(0.2% + 1) | 1°C |
| WRe5/26 | 0–2320°C | ±(0.2% + 1) | 1°C |
<text color="secondary" size="xs">Thermocouple ranges and accuracy are reproduced from the supplied SG-004A manual.</text>
Resistance and Temperature Sensor Specifications
| Signal Type | Range | Accuracy | Resolution |
|---|---|---|---|
| Resistance (Ω) | 0–390Ω | ±(0.2% + 1) | 0.1Ω |
| Pt100 | -200 to 650°C | ±(0.5% + 1) | 0.1°C |
| Cu50 | -20 to 150°C | ±(0.5% + 1) | 0.1°C |
Frequency and PWM Functions
| Parameter | Specification |
|---|---|
| Frequency Output Ranges | 0–99.999Hz / 0–999.99Hz / 0–9999Hz / 0–200kHz |
| Frequency Input Range | 0–9999Hz |
| PWM Output | Supported |
| Maximum PWM Frequency | 9999Hz |
| Maximum Output Peak Level | 24V |
| Speed Simulation | Supported |
| Quantitative Pulse Output | Supported |
| Pulse Counting | Supported |
Additional Functional Specifications
| Function | Description |
|---|---|
| Preset Signal Groups | 4 |
| Programmable Output Modes | Monotonic rise / Monotonic fall / Cycle |
| Programmable Output Cycles | Up to 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 |
| Historical Records | Recording and viewing of historical data |
| Output Timing | Automatic output shutdown after configured time |
| Communication Protocol | Modbus Slave |
| Communication Interface | RS485 |
| Firmware Update | USB-emulated storage |
Applications
- PLC System Debugging: Generate and measure current, voltage, frequency, and other signals for testing compatible PLC input and output channels.
- Industrial Process Instrumentation: Test and simulate signals used by industrial measurement and control equipment.
- 4–20mA Current Loop Testing: Generate and measure standard current-loop signals for industrial transmitters and controllers.
- Valve Positioner Adjustment: Simulate control signals and test valve position feedback in compatible systems.
- Thermocouple Testing: Generate and measure thermocouple signals for checking temperature measurement and control equipment.
- RTD and Resistance Sensor Testing: Test compatible Pt100, Cu50, and resistance-based input circuits.
- Frequency and PWM Testing: Generate frequency, PWM, speed, and pulse signals for compatible control systems.
- 24V Loop Testing: Supply compatible two-wire transmitters and pneumatic control valves while monitoring current feedback.
- Signal Conversion: Convert one signal type into another for industrial simulation and troubleshooting.
- Inverter Testing: Generate suitable signals for checking compatible inverter control interfaces.
- Industrial Maintenance: Monitor input and output signals, review historical records, and observe real-time signal curves during troubleshooting.
- Equipment Commissioning: Verify analog signal paths and control interfaces during installation and setup.
Package Contents
The supplied operating manual does not provide an itemized package contents list. Please confirm the included accessories, cables, and any charging adapter with the supplier before publishing a definitive package list.
Frequently Asked Questions (FAQ)
1. What types of signals does the FNIRSI SG-004A support?
The SG-004A supports current, voltage, frequency, millivolt, thermocouple, and resistance signal modes. It also supports Pt100 and Cu50 temperature sensor functions, PWM generation, and 24V loop detection.
2. Can the SG-004A generate and measure 4–20mA signals?
Yes. It supports 0–24mA active current output, passive current (XMT) output, and current measurement. This range includes the commonly used 4–20mA industrial current-loop signal.
3. Which thermocouple types are supported?
The SG-004A supports S, B, E, K, R, J, T, and N thermocouple types, as well as WRe3/25 and WRe5/26 types. It supports thermocouple signal simulation and measurement functions.
4. Does the device support Pt100 and Cu50 temperature sensors?
Yes. The device supports resistance and thermal resistance functions, including Pt100 and Cu50. The specified temperature ranges are -200 to 650°C for Pt100 and -20 to 150°C for Cu50.
5. What is the purpose of the 24V loop detection function?
The 24V loop function supplies voltage to compatible devices while measuring the current feedback in the loop. It can be used to test two-wire transmitters and certain pneumatic control valves. The device also supports an independent 24V power output through its configurable IN− terminal.
6. Can the SG-004A generate frequency and PWM signals?
Yes. It supports frequency output ranges up to 0–200kHz, along with PWM, speed simulation, and quantitative pulse functions. The maximum PWM frequency specified in the manual is 9999Hz.
7. Can the SG-004A convert one signal type into another?
Yes. Its 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.
8. Does the FNIRSI SG-004A support communication with PLCs?
Yes. It 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.
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