Welch Allyn Cardio Perfect Workstation (SW 1.6.2) Single CPu Install (Windows Vista) Instructions - Installation Guide - Manual (Page 3)

Finish
Finish
Finish
Do not cancel. You must install this USB
driver even if you did not purchase the ECG recorder option.
CardioPerfect CD.
2 If you’ll be using a spirometer or ECG recorder,
set up the computer to keep power on.
Keeping power on ensures continuous communication
with your USB devices .
(next page)
3
Caution: Do not plug
in any USB devices yet.