The conventional way of measuring signals with a probe and ground loop creates a large area for noise collecting. The loop causes parasitic inductances causing inaccurate measurements. One method to reduce these artificial noise is to use a tip and barrel method. Remove the ground wire and probe hooks. There is a metal barrel on probe which is connected to the common ground. Connect the tip of the probe to vout and lean the probe where the barrel will touch the ground node. Usually the connection point will be at the output capacitors. One way to make the method easier is to wrap metal wire around the barrel to use as a tip. This will cause a loop, but much smaller compared to the previous method.
