Magneti Marelli Vision Guida Rapida página 40

CONNECTOR AND CABLE POSITION
This function allows displaying the position and cable for
vehicle diagnostics.
OSCILLOSCOPE
The instrument features a 4-channel 25MS/s oscilloscope. Cable
connection is as shown in the figure.
CAUTION The black port is the ground. To take measurements,
you must always connect this cable to the vehicle ground signal.
The other ports are colour-coded according to the colour of the
corresponding line on the screen.