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

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Caution: Do not plug in any USB devices yet.
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 .
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