1. Introduction
The FG-200 DDS Function Signal Generator is a compact and versatile device designed for generating a wide array of waveforms. It is an essential tool for electronic circuit testing, debugging, frequency characteristic analysis, and pulse response testing of audio amplifiers. With its high accuracy and frequency stability, it is also well-suited for calibrating oscilloscope scanning time factors.
2. Key Features
- Supports 15 distinct waveform outputs: Sine, Square, Triangular, Forward Sawtooth, Reverse Sawtooth, Half-wave, Full-wave, Schumann wave, Noise waveform, Electrocardiogram (ECG), Exponential Rise, Exponential Decrease, Lorentz Pulse, Gaussian Pulse, and Sinc Pulse.
- Fully functional and user-friendly interface.
- Compact and portable design (125 x 80 x 26.5mm).
- Equipped with a save function to retain all configured parameters.
- Adjustable output amplitude (up to ±10V P-P) and DC offset (up to 10V).
- Integrated switchable filter for optimizing sine and pulse waveform outputs.
- High accuracy and frequency stability, ideal for oscilloscope calibration.
3. Technical Specifications
| Parameter | Value |
|---|---|
| Output Waveforms | 15 types (Sine, Square, Triangle, Sawtooth, Resawtooth, ECG, EXP rise, EXP decay, Lorenz, Gaussian, Sinc, Half wave, Full wave, Schumann, Noise) |
| Power Supply | DC 4-9V (DC5V recommended), 3.5mm DC interface |
| Current Consumption | 180mA at 5V |
| Frequency Range (Sine Wave) | 0.01Hz - 500kHz |
| Frequency Range (Other Waveforms) | 0.01Hz - 100kHz (can be extended with reduced distortion requirements) |
| Frequency Resolution | 0.01Hz |
| Sine Wave Distortion | <1% below 1kHz, <0.5% above 1kHz |
| Output Amplitude | Max ±10V (Peak-to-Peak) |
| Output Impedance | 50 Ω |
| DC Offset | Max 10V (with shutdown function) |
| Dimensions | 125.8mm x 80.5mm x 26.6mm (approx. 4.95in x 3.17in x 1.05in) |
4. Package Contents
The FG-200 DDS Function Signal Generator is available in two package options:
Package 1:
- FG-200 Host Unit (1)
- USB Power Cord (1)
- BNC Clamp Wire (1)
Package 2:
- FG-200 Host Unit (1)
- USB Power Cord (1)
- BNC Clamp Wire (1)
- Double-ended BNC Cable (1)
- Schumann Wave Module Board (1)
5. Setup Instructions
- Power Connection: Connect the provided USB to 3.5mm cable to the power input port of the FG-200. For power, use a computer USB interface, a mobile phone charging head, or a power bank. It is highly recommended to use a power source that has passed 3C certification to prevent potential signal generator malfunctions due to poor power supply.
- Output Connection: Connect the BNC clamp wire to the DDS OUT port on the generator.
- Connect the red clamp wire to the oscilloscope probe.
- Connect the black clamp wire to the oscilloscope GND clamp.
6. Operating Instructions
6.1. General Operation Flow
- Power On: Press the POWER switch to turn on the device.
- Select Waveform: Press the
MODEkey to cycle through and select the desired output waveform. - Adjust Frequency: Use the
CURSORkey to move the cursor to the frequency digits. Then, use the+and-keys to adjust the frequency value. - Adjust Amplitude: Rotate the
AMPknob clockwise to increase the signal amplitude. - Adjust DC Offset:
- Press the
DC OFFSETswitch toON. - Use the yellow knob to adjust the DC component of the signal.
- To remove DC offset, press the
DC OFFSETswitch toOFF.
- Press the
- Apply Filter: For sine waves of 300KHz or larger, press the
FILTERbutton to clarify the waveform. Note that this may slightly decrease the signal amplitude. - Start/Stop Output: Press the
RUN/STOPbutton to start or stop the waveform output. When the cursor is not flashing, the waveform is being output, and other keys are inactive. To adjust parameters, pressRUN/STOPfirst to make the cursor flash. - Save Settings: All setting parameters are automatically saved.
6.2. Waveform Types
The FG-200 supports the following 15 waveform types:
| Waveform Name | Description |
|---|---|
| SIN | Sinusoidal waveform |
| Square | Square waveform |
| Triangle | Triangle waveform |
| Sawtooth | Forward sawtooth wave |
| Resawtooth | Anti-sawtooth waveform |
| ECG | Electrocardiogram waveform |
| EXP rise | Exponential rise waveform |
| EXP decay | Exponential decrease waveform |
| Lorenz | Lorenz pulse |
| Gaussian | Gaussian pulse |
| Sinc | Sinc pulse |
| Half wave | Half-wave rectified waveform |
| Full wave | Full-wave rectified waveform |
| Schumann | Schumann wave |
| Noise | Noise waveform |
7. Maintenance
- Keep the device clean and free from dust. Use a soft, dry cloth for cleaning.
- Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
- Do not use abrasive cleaners or solvents.
- Store the device in a safe place when not in use to prevent physical damage.
8. Troubleshooting
- No Signal Output:
- Ensure the power supply is connected correctly and is a stable DC 4-9V (preferably 5V) source. Poor power supply can cause malfunction.
- Verify that the BNC clamp wire is securely connected to the "DDS OUT" port and to the oscilloscope probe/GND.
- Check if the
RUN/STOPbutton is in the "RUN" state (cursor not flashing). - Confirm that a waveform type has been selected using the
MODEkey.
- Distorted or Unclear Waveform:
- For sine waves of 300KHz or higher, try pressing the
FILTERbutton to clarify the waveform. - Ensure the power supply is stable and sufficient.
- Check the oscilloscope settings (e.g., vertical scale, time base) to ensure they are appropriate for the signal being generated.
- For sine waves of 300KHz or higher, try pressing the
- Cannot Adjust Parameters:
- Press the
RUN/STOPbutton. The cursor on the display should flash, indicating that parameters can now be adjusted.
- Press the
9. User Tips
- For optimal performance and to avoid signal noise, always use a high-quality, stable 5V power adapter, preferably one that is 3C certified.
- When working with higher frequencies, especially sine waves above 300KHz, remember to engage the
FILTERfunction for a cleaner output, keeping in mind a slight amplitude reduction may occur. - The device automatically saves your last settings, making it convenient for repeated experiments or measurements.
- The square wave output is particularly useful for calibrating oscilloscope attenuators and probes due to its sharp transitions.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the retailer or manufacturer directly. Keep your purchase receipt as proof of purchase.
