A direct low impedance connection to chassis is important. A low cost approach is to use the mother board mounting pads. The effective capacitor leads. Am I supposed to have different mounting holes for both chassis ground and signal ground that get connected via the chassis or should I just connect both signal and chassis ground on the mounting hole? I have a connector which uses a TVS diode which is connected to signal ground and then the signal. If Chassis pin of power supply is accessible, connect to IAA105 Chassis pin. Sensor –Excitation connected to IAA105 where all grounds are connected together. Ground loop can introduce. The shields of the I/O connectors are connected to a CHASSIS_GND plane on the periphery of the PCB and also make contact with the front panel of the metal chassis. The CHASSIS_GND is isolated from digital GND by a moat (void). If there is an isolating transformer in the power supply it should be better not to connect the PCB to ground. The problem with connecting the ground in a undefined way is. Common bonding connections in the telecommunications closet space include (a) split bolt on cable basket, (b) jumper on ladder rack, (c) HTAP on TBB, and (d) auxiliary cable brackets on ladder rack.
