Signal coupling

The signal coupling or input coupling selection determines how the signal on the input is passed on.

  • DC coupling allows for both the AC and the DC components of the input signal to pass.
  • AC coupling rejects the DC component of the input signal and only the AC component is measured.

Use AC coupling when investigating an AC signal on a rather large DC component. Use DC coupling when measuring DC signals, like e.g. a battery voltage.

Changing the signal coupling of a channel in the Multi Channel oscilloscope software can be done in various different ways:

  • Using the input coupling button Coupling button on the channel toolbar
  • Opening the channel settings dialog using the Settings dialog Channel settings dialog button and selecting the required coupling in the dialog.
  • Using hotkeys A and D in combination with the appropriate channel selection hotkey(s)
  • Clicking the input coupling buttons Coupling AC button (AC) and Coupling DC button (DC) on the channel toolbar
  • Right-clicking the channel in the Object Tree and selecting the appropriate coupling in the channel popup menu