Several tips from the experience of "EMC Engineering Lab".
Touch screen - medical grade only (see the performance comparison of EMC test results in "industrial" and "medical" grade screen of the same producer in the picture below).

AC/DC PS - medical grade only (low EMC noise for class B products)
Modular AC/DC PS is better than multiple power supplies connected in parallel after medical transformer isolation (to reduce current leakage)
DC/DC - medical grade only, NO self-depeloping for class B products.
Fans, pumps, cooling elements - DC only and with CB reports.
Inlet AC filter - must, medical grade.
Cables - shielded and grounded on power, drivers, high RF signals, etc.
Generally use only recognizedand well-known parts suppliers with all relevant medical standards approvals.
Pre-compliance tests - mandatory, on the first HW design (CE, RE must - ESD, RI nice to have).
Emergency stop button on front panel of the machine.
Key for powering up the machine - can't be removed from the key house when machine is working – user needs to turn the key to the off position to remove the key.
All high power cards in metal grounded boxes.
Labels
Comments