1. Introduction
The FNIRSI SG-003A is a versatile signal generator designed for industrial and scientific applications, offering precise simulation and measurement of voltage and current signals. This device integrates multiple functions including active and passive current output, voltage output, PWM pulse output, and signal input measurement. Its compact design, high-definition color display, and long-lasting battery make it an essential tool for calibration, testing, and maintenance tasks.
2. Safety Information
Please read and understand all safety instructions before operating the device. Failure to follow these instructions may result in injury or damage to the device.
- Do not operate the device in wet or damp conditions.
- Ensure proper ventilation to prevent overheating.
- Use only the specified power adapter (5V Type-C) for charging.
- Avoid applying voltages or currents exceeding the device's maximum ratings.
- Do not attempt to disassemble or modify the device. Refer all servicing to qualified personnel.
- Keep the device away from strong electromagnetic fields.
3. Product Overview
The FNIRSI SG-003A Signal Generator is equipped with a 2.4-inch TFT color LCD display and intuitive controls for easy operation. It supports a wide range of signal generation and measurement capabilities.
3.1 Key Features
- Signal Output: Active current (0-24mA), Passive current (0-24mA), Voltage (0-24V), 24V loop output, PWM pulse output (0-9999Hz).
- Signal Input: Current (0-24mA), Voltage (0-30V).
- Automatic Output: Single rise, single fall, and cycle modes for voltage and current.
- Custom Output: User-definable upper and lower output limits.
- Real-time Curve: Displays voltage and current changes with a 10 frames/second refresh rate.
- Conversion Modes: Input to output conversion, voltage to active/passive current, current to voltage.
- Display: 2.4-inch 240*320 resolution TFT color LCD.
- Power: Built-in 3000mHA lithium battery, rechargeable via 5V Type-C interface.
3.2 Device Layout
The following image illustrates the main components and interface of the SG-003A Signal Generator.
Figure 1: FNIRSI SG-003A Signal Generator with test leads connected. The display shows current input and output values, along with various function buttons like IN, OUT, AUTO, ON/OFF, CURVE, and FN.
The device features input and output terminals, a clear LCD screen, and a set of control buttons for navigating menus and adjusting parameters. The top panel includes ports for COM, OUT, IN-24V, and IN+ connections, clearly labeled for signal input and output.
Figure 2: The SG-003A highlighting its multiple signal capabilities: Program output, Analog source, DC voltage/current, and 24V power output.
4. Setup
4.1 Charging the Device
The SG-003A is powered by a built-in 3000mHA lithium battery. To charge the device:
- Connect a standard 5V Type-C USB charger to the charging port on the device.
- The battery indicator on the display will show the charging status.
- Allow the device to charge fully before first use for optimal battery life.
4.2 Powering On/Off
- To Power On: Press and hold the ON/OFF button until the display illuminates.
- To Power Off: Press and hold the ON/OFF button until the display turns off.
4.3 Connecting Test Leads
Connect the appropriate test leads to the labeled ports on the top of the device:
- COM: Common ground connection.
- OUT: Signal output terminal.
- IN-24V: Input terminal for negative voltage or current measurement, or 24V loop power.
- IN+: Input terminal for positive voltage or current measurement.
Ensure all connections are secure before operation.
5. Operating Instructions
The SG-003A features a user-friendly interface. Use the directional buttons (▲, ▼, ◀, ▶) to navigate menus and adjust values. The FN button typically accesses function menus or secondary operations, while IN and OUT switch between input and output modes.
5.1 Signal Output Modes
Press the OUT button to enter output mode. Use the directional buttons to select the desired output type (Active Current, Passive Current, Voltage, 24V Loop, PWM).
- Active Current Output (0-24mA):
Select "Active Current" mode. Use the directional buttons to adjust the output current value. The maximum load is 750Ω.
- Passive Current Output (0-24mA):
Select "Passive Current" mode. An external power supply up to 30V is required for this mode. Adjust the output current as needed.
- Voltage Output (0-24V):
Select "Voltage Output" mode. Adjust the desired voltage value. The maximum output current is 30mA.
- 24V Loop Output:
This mode provides a 24V power source for powering 2-wire transmitters or other devices. The drive current is 24mA.
- PWM Pulse Output (0-9999Hz):
Select "PWM Output" mode. You can set both the frequency and the duty cycle of the pulse signal using the directional buttons.
5.2 Signal Input Measurement Modes
Press the IN button to enter input measurement mode. Connect the signal to be measured to the appropriate input terminals (IN+ and IN-24V/COM).
- Current Input Measurement (0-24mA):
Select "Current Input" mode. The device will display the measured current. Input impedance is 100Ω.
- Voltage Input Measurement (0-30V):
Select "Voltage Input" mode. The device will display the measured voltage.
5.3 Advanced Functions
- Automatic Output (AUTO button):
Press the AUTO button to cycle through automatic output modes: single rise, single fall, and cycle. This automates the change in output voltage or current over a set range.
- Custom Output Limits:
In output mode, use the FN button to access settings for custom output limits. You can set arbitrary upper and lower limits for the output signal.
- Real-time Curve Display (CURVE button):
Press the CURVE button to view a real-time graph of voltage and current changes. This feature is useful for observing signal stability and transients.
- Input to Output Conversion (CONVRET button):
The device supports various conversion modes, such as voltage to active/passive current, and current to voltage. Use the CONVRET button to cycle through these conversion types and configure parameters.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Charge the device regularly, especially if it will be stored for an extended period.
- Storage: Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.
- Calibration: While the device is factory calibrated, periodic professional calibration may be required for applications demanding high precision.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low battery or faulty power button. | Charge the device using a 5V Type-C charger. Ensure the ON/OFF button is pressed correctly. |
| No signal output. | Incorrect mode selected, incorrect wiring, or output value set to zero. | Verify the output mode is active. Check test lead connections. Adjust the output value above zero. |
| Inaccurate readings. | Poor connection, external interference, or device requires calibration. | Ensure secure connections. Operate away from strong electromagnetic sources. Consider professional calibration if precision is critical. |
| Display is dim or unresponsive. | Low battery or software issue. | Charge the device. If the issue persists, try restarting the device. |
8. Technical Specifications
The following table details the technical specifications of the FNIRSI SG-003A Signal Generator.
Figure 3: Detailed technical parameters of the SG-003A, including ranges, precision, and resolution for various input and output signals.
| Parameter | Value |
|---|---|
| Active Current Output | Range: 0-24 mA; Resolution: 0.01 mA; Max Load: 750Ω; Accuracy: ±(0.1%+0.005) |
| Passive Current Output | Range: 0-24 mA; Resolution: 0.01 mA; External Power Supply: Up to 30V; Accuracy: ±(0.1%+0.005) |
| Voltage Output | Range: 0-24 V; Resolution: 0.01 V; Max Current: 30 mA; Accuracy: ±(0.1%+0.005) |
| 24V Output | Drive Current: 24 mA; Resolution: 0.01 mA; Accuracy: ±(0.1%+0.005) |
| Current Input Measurement | Range: 0-24 mA; Resolution: 0.01 mA; Input Impedance: 100Ω; Accuracy: ±(0.1%+0.05) |
| Voltage Input Measurement | Range: 0-30 V; Resolution: 0.01 V; Accuracy: ±(0.1%+0.05) |
| PWM Output | Frequency: 0-9999 Hz; Duty Cycle: Adjustable |
| Display | 2.4-inch TFT Color LCD, 240*320 resolution |
| Battery | 3000mHA Lithium Battery, 5V Type-C Charging |
| Power Consumption | Max 0.32 W |
| Dimensions | 20 x 10 x 15 cm |
| Weight | 1 kg |
9. Warranty and Support
FNIRSI products are designed for reliability and performance. For warranty information and technical support, please refer to the official FNIRSI website or contact your authorized dealer. Keep your purchase receipt as proof of purchase for warranty claims.
For software updates, please check the manufacturer's official channels. The product's software update guarantee status is unknown as per available information.