For higher frequencies (MHz range), you use an external USB module. The module samples the high-speed signal and sends the data to your PC via USB, where the software renders the waveform. Benefits of Using PC Software

The software "listens" to the microphone or line-in jack. Since sound cards are designed for audio, they are generally limited to a frequency range of 20 Hz to 20 kHz . This is perfect for audio engineering and basic hobbyist projects.

If you own a Hantek USB oscilloscope hardware unit, you must download their specific driver and software package from the Hantek Download Center.

A PC-based oscilloscope functions by capturing incoming electrical signals and processing them for display on your monitor. This happens in two main ways:

When using your sound card as an input, to your computer. Sound cards typically handle only 1V to 2V . Connecting higher voltages will permanently destroy your motherboard or sound card. Always use a voltage divider or a protective circuit if you aren't using professional USB hardware.