Vernier EasyData Guidebook - Manual (Page 30)

EasyData Guidebook 29
Options: To use a device other than a Vernier Picket Fence, select from the Motion
Timing Settings dialog box and select one of the following.
Pulley (Outside Edge) if you are using a 10-spoke Super Pulley and want to measure
rotational or linear motion based on the outside diameter of the pulley wheel. For example,
rolling the pulley along a table top.
Pulley (Inside Edge) if you are using a 10-spoke Super Pulley and want to measure
rotational or linear motion created by a string running through the pulley’s groove. For
example, setting up an Atwood’s machine experiment.
User Defined when using a different type of device like a bar tape or a 3-spoke pulley.