Sav
Im sure the standard for PCs say that they only require safety testing every 5 years. If the PC is classed as a medical device then it requires testing as one, we use a Rigel 266+ to test them, as you can manually turn the power on/off. This allows us to boot up the computer with the power on, take a reading, shut it down, change to next test etc.
Just to point out that its not unusual for operating to have PC's in them for docs/consultants to view records, X-Rays etc.
Regards
Alan
