Microscan QX Hawk User Manual page 339

Expected Power and Ground Connections for Proper Operation
Notes:
Ensure that mounting bracket "Earth" is at the same potential as power source "Earth".
Supply "Return" and "Earth" ground must be stable, low-impedance reference points.
"2-Terminal Power Supply" must still provide an "Earth" connection to the imager.
"Signal Ground" can be used for communications and/or discrete signal ground reference.
It must not be used as Power Ground or Earth Ground.
QX Hawk Industrial Imager User Manual
Appendices
A-21