Waveform Generator (WGM-101)

The WGM-101 is an USB-powered waveform generator small enough to fit in your pocket. This device generates all standard test waveforms (Sine, Square, Triangle, Sawtooth) as well as arbitrary waveforms created by the user. Precise digital frequency control allows adjustment of the output frequency from 0.1Hz to 100kHz with a resolution of 0.1Hz. The open source graphical user interface allows the user to download custom waveforms into the device for non-volatile storage, sweep the frequency over a particular frequency range with a point-and-click interface, and directly control the output amplitude and offset.

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Specifications

Direct digital synthesis (DDS) of waveforms
Four built-in waveforms: sine, square, triangle, sawtooth
One user programmable waveform
Frequency range: 0.1 Hz to 100 kHz
Frequency resolution: 0.1 Hz
Vertical resolution: 8 bit
Output voltage: +/-10V
Offset voltage: 0 to +/-10V
Waveform horizontal resolution: 8 bit
150 ohm output impedance

Arbitrary Waveform Examples

The following waveforms were generated using the arbitrary waveform function of the WGM-101. These screenshots were captured using the DSO-101 Digital Storage Oscilloscope.

Electrocardiogram (ECG)

Electromyogram (EMG)

Electroencephalogram (EEG)

Click here to see software contributed by one of our users which enables you to draw custom waveforms.

Output Spectrum

The WGM maintains its 8-bit vertical resolution independently of the output
amplitude setting. The spectrum analysis screen shot illustrates this with
the spectrum analysis of a 1kHz generator sine wave. In this measurement the
generator amplitude is near the minimum setting, 100mVp-p to match the
microphone input level on a laptop computer.

For the 8 bit vertical resolution of the WGM-101 generator, the theoretical
dynamic range is about 48db. Notice that the distortion components - at
harmonics of 1kHz - are at or below that level.

This spectrum applies throughout the entire amplitude range of the generator.

System Requirements

Pentium 233 MHz, 64 MB RAM, 5 MB Hard Drive Space
Minimum 800x600 screen resolution at 16 bit color depth
USB Port
Windows 98SE/Windows ME/Windows 2000/Windows XP
Linux with kernel 2.4 or higher, X Windows