# 5.3 Editing channels

## Setting the channel type

It is necessary that each channel is set to the right type to perform the analyses correctly. You can find the different channel types below.

To change the channel type you have to:

1. Select the channel(s) you want to change.
2. Right-click and select Set Channel Type.
3. Select the correct type.

If you imported a DIRAC project in which you have already set the correct channel type, this is already correctly set up for SOURCE.

 Type Technical Nomenclature Description Used for: Response channels $$\mathbf{u}$$ any response channels used in the TPA all analyses Internal source vibrations $$\mathbf{{u}_1}$$ located on the active side near the actual source of the vibration - Interface vibrations $$\mathbf{{u}_2}$$ located near the interfaces free velocity TPA Active-side interface vibrations $$\mathbf{{u}_{2a}}$$ located near the interfaces, on the active side interface force TPA Passive side interface vibrations $$\mathbf{{u}_{2b}}$$ located near the interfaces, on the passive side interface force TPA Differential interface vibrations $$\mathbf{{u}_{2a} - {u}_{2b}}$$ the difference between active and passive side vibrations interface force TPA Indicator responses $$\mathbf{{u}_{4}}$$ located near the interfaces, used to capture vibration due to all forces in-situ TPA Target responses $$\mathbf{{u}_{3}}$$ locations of interest for TPA (e.g. microphone @ driver’s ear) all analyses On-board validation responses $$\mathbf{{u}_{3,ov}}$$ locations of interest for on-board validation all analyses Force channels $$\mathbf{f}$$ any force channels used in the TPA all analyses Internal forces $$\mathbf{{f}_{1}}$$ located on the active side near the actual source of the vibration - Interface forces $$\mathbf{{f}_{2}}$$ located near the interfaces all analyses Active-side interface forces $$\mathbf{{f}_{2a}}$$ located near the interfaces, on the active side all analyses Passive-side interface forces $$\mathbf{{f}_{2b}}$$ located near the interfaces, on the passive side all analyses Target forces $$\mathbf{{f}_{3}}$$ locations of interest for TPA (e.g. microphone @ driver’s ear) reciprocal measurements Tracking channels - channels that contain information about the operation conditions (e.g. CAN bus, tacho, etc.) all analyses

## Editing channels position and direction

If needed, you can edit the position and direction of the channels in SOURCE.

To change position and/or direction you have to:

1. Open the Channels card.
2. Click on the toggle to go to Edit mode.
3. Double click on the field you want to edit and type the correct information.
4. Press Enter to save.
5. Exit the Edit mode.