1. Introduction
The RUIBOZHI FG-100 and FG-200 are Direct Digital Synthesis (DDS) function signal generators designed for a wide range of electronic testing and debugging applications. These compact and versatile devices can generate various waveforms, including sine, square, triangle, and more complex pulses, across a broad frequency spectrum. They are ideal for use with oscilloscopes for circuit analysis, frequency response testing, and impulse response measurements of audio amplifiers. The DDS technology ensures good precision and frequency stability, making them suitable for oscilloscope sweep time factor calibration and probe pulse characteristic adjustments.
2. Safety Information
- Always ensure the device is powered by a stable and appropriate power supply (DC 3.5-10V for FG-100, DC 4-9V for FG-200). Using an unstable or incorrect power supply can lead to improper operation or damage.
- Avoid exposing the device to moisture, extreme temperatures, or direct sunlight.
- Do not attempt to open or modify the device. Refer all servicing to qualified personnel.
- Ensure proper grounding when connecting to other equipment, especially oscilloscopes, to prevent electrical hazards and ensure accurate measurements.
- Keep out of reach of children.
3. Package Contents
Please check the package for the following items:
- FG-100 or FG-200 DDS Function Signal Generator (depending on model purchased)
- USB power adapter cable
- BNC to clip line (for connecting to an oscilloscope)
- Schumann wave antenna (included with FG-200 Kit2)
4. Specifications
4.1 FG-200 DDS Function Signal Generator
| Parameter | Value |
|---|---|
| Output Waveforms | Sine, Square, Triangle, Forward Sawtooth, Reverse Sawtooth, ECG, Exponential Rise, Exponential Fall, Lorentz Pulse, Gauss Pulse, Sinc Pulse, Half-wave, Full-wave, Schumann Wave, Noise Wave (15 types) |
| Power Supply | DC 4-9V (DC5V recommended with adapter, 3.7V lithium battery for battery power) |
| Current | 180mA at 5V |
| Frequency Range (Sine) | 0.01Hz - 500.00kHz (amplitude decreases at higher frequencies) |
| Frequency Range (Other Waveforms) | 0.01Hz - 100.00kHz (can be increased if distortion/jitter requirements are low) |
| Resolution | 0.01Hz |
| Sine Wave Distortion | <1% below 1kHz, <0.5% above 1kHz |
| Output Amplitude | Maximum ±10V (P-P) |
| Output Impedance | 50 ohms |
| DC Offset | Maximum ±10V, with shutdown function |
| Dimensions | 140mm (L) x 80mm (W) x 26.5mm (H) |
4.2 FG-100 DDS Function Signal Generator
| Parameter | Value |
|---|---|
| Output Waveforms | Sine wave, Square-wave, Triangular wave, Sawtooth wave |
| Power Supply | DC 3.5-10V |
| Frequency Range (Sine) | 1Hz - 500KHz |
| Frequency Range (Square/Triangle/Sawtooth) | 1Hz - 20kHz (valid range) |
| Resolution | 1 Hz |
| Output Amplitude | Maximum ±10Vpp (no-load) |
| Output Impedance | 50Ohm ±10% |
| DC Bias | ±10V (no-load) |
| Display | LCD1602 |
| Dimensions | 130mm (L) x 100mm (W) x 50mm (H) |
5. Product Overview
5.1 Front Panel Controls (FG-100/FG-200)
- POWER: On/Off switch for the device.
- MODE: Used to cycle through and select the desired output waveform.
- CURSOR: Moves the cursor on the display, typically used to select digits for frequency adjustment.
- +: Increases the selected frequency digit or value.
- -: Decreases the selected frequency digit or value.
- RUN/STOP: Toggles the waveform output on or off. When the waveform is running (cursor not blinking), other keys are inactive. Press this key first to adjust parameters.
- DC OFFSET: A push-button switch to enable/disable DC bias. When ON, the yellow knob (FG-200) or the main knob (FG-100) can adjust the DC component of the signal. When OFF, the DC component is 0.
- FILTER: A push-button switch to activate a filter. Useful for cleaning sine waves at frequencies near or above 300KHz, though it may slightly reduce signal amplitude.
- AMP (Amplitude Knob): A rotary knob (typically on the side) to adjust the output signal amplitude. Turning clockwise increases the amplitude.
- OUT (BNC Connector): The main output port for the generated signal.
- Power Input: Port for connecting the USB power adapter cable.
6. Setup Instructions
- Power Connection:
Connect the provided USB power adapter cable to the power input port of the signal generator. For the other end, use a reliable power source such as a computer USB interface, a cell phone charging head, or a power bank. It is highly recommended to use a power supply with 3C certification to ensure stable operation. A poor quality power supply can cause the signal generator to malfunction. - Connecting to an Oscilloscope:
Use the BNC to clip line. Connect the BNC end to the 'OUT' port of the signal generator. Connect the red clip to your oscilloscope probe and the black clip to the oscilloscope's ground (GND) clip. - Initial Power On:
Press the 'POWER' switch to turn on the device. The LCD display should illuminate.
7. Operating Instructions
- Selecting Waveform:
After powering on, press the 'MODE' key to cycle through the available waveforms. The selected waveform will be displayed on the LCD. Available waveforms include:- SIN: Sine waveform
- Square: Square waveform
- Triangle: Triangle waveform
- Sawtooth: Forward sawtooth wave
- Resawtooth: Reverse sawtooth waveform
- ECG: Electrocardiogram
- EXP-rise: Exponential rise
- EXP-decay: Exponential decrease
- Lorenz: Lorenz pulse (FG-200 only)
- Gaussian: Gaussian pulse (FG-200 only)
- Sinc: Sinc pulse (FG-200 only)
- Half-wave: Half-wave (FG-200 only)
- Full-wave: Full wave (FG-200 only)
- Schumann: Schumann wave (FG-200 only)
- Noise: Noise wave (FG-200 only)
- Adjusting Frequency:
To adjust the frequency, first ensure the waveform output is stopped by pressing 'RUN/STOP' (the cursor should be blinking). Use the 'CURSOR' key to move the blinking cursor to the desired digit of the frequency. Then, use the '+' and '-' keys to increase or decrease the value of that digit. - Starting/Stopping Waveform Output:
Press the 'RUN/STOP' key to start or stop the waveform output. When the waveform is running, the cursor will not blink, and other parameter adjustment keys will be temporarily inactive. To make adjustments, press 'RUN/STOP' again to stop the output and enable parameter editing. - Adjusting DC Offset:
Press the 'DCOFFSET' button to toggle the DC bias function. When 'ON', use the dedicated yellow knob (FG-200) or the main rotary knob (FG-100) to adjust the DC component of the signal. When 'OFF', the signal will have no DC component. - Using the Filter:
For cleaner sine wave outputs, especially at frequencies near or above 300KHz, press the 'FILTER' button. This will activate a filter that reduces noise and distortion. Note that activating the filter may also slightly reduce the signal amplitude. - Adjusting Amplitude:
Use the 'AMP' rotary knob (typically on the side of the unit) to adjust the peak-to-peak amplitude of the output signal. Turn the knob clockwise to increase the amplitude and counter-clockwise to decrease it.
8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use liquid cleaners or solvents, as they may damage the casing or internal components.
- Storage: Store the signal generator in a cool, dry place away from direct sunlight, dust, and moisture when not in use.
- Cable Care: Handle all cables and connectors with care. Avoid bending or crimping cables excessively, which can lead to internal damage.
- Battery (if applicable): If using a lithium battery, follow standard battery safety guidelines. Do not expose to high temperatures or puncture.
9. Troubleshooting
- Device does not power on: Ensure the USB power adapter cable is securely connected to both the device and a functioning power source. Verify the power source is providing the correct voltage (DC 3.5-10V for FG-100, DC 4-9V for FG-200).
- No waveform output: Check if the 'RUN/STOP' button is in the 'RUN' state (cursor not blinking). Ensure the output cable is correctly connected to the 'OUT' port and to your measurement device (e.g., oscilloscope). Verify the amplitude knob ('AMP') is not set to minimum.
- Waveform appears distorted or noisy:
- Ensure you are using a stable and high-quality power supply. Poor power supply can introduce noise.
- For sine waves at higher frequencies, try activating the 'FILTER' function.
- Check your oscilloscope settings (e.g., input coupling, bandwidth limit) and probe compensation.
- Ensure proper grounding of all connected equipment.
- Cannot adjust frequency or other parameters: If the cursor is not blinking, the device is in 'RUN' mode. Press 'RUN/STOP' to enter 'STOP' mode, which enables parameter adjustments.
- Amplitude is too low/high: Adjust the 'AMP' rotary knob. If the signal is still too low, check the DC offset setting and ensure it's not cancelling out the signal.
10. User Tips
- Power Supply Quality: Always prioritize using a stable and certified power supply. An unstable power source is a common cause of unexpected behavior or signal distortion.
- High-Frequency Waveforms (FG-200): For non-sine waveforms on the FG-200, while the specified valid range is up to 100kHz, you can experiment with higher frequencies if your application has lower requirements for distortion and jitter.
- Oscilloscope Calibration: The precise frequency output of these DDS generators makes them excellent tools for calibrating the sweep time factor of your oscilloscope.
- Probe Compensation: Use the square wave output to adjust your oscilloscope probe's compensation for accurate measurements.
- Saving Settings: Both models are designed to save all setup parameters, so your last configuration will be retained upon restart.
11. Warranty and Support
This RUIBOZHI DDS Function Signal Generator is covered by a manufacturer's warranty against defects in materials and workmanship. Please refer to your purchase documentation for specific warranty terms and duration. For technical support, troubleshooting assistance, or warranty claims, please contact the seller or manufacturer directly through the contact information provided at the time of purchase.