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Scope is open. Stop sampling and quit the program first before
disconnecting a PowerLab from USB.
You can safely turn on or off, or disconnect or reconnect, a USB-
connected PowerLab while the computer remains on, as long as the
application program (Chart or Scope) is off when you do it.
(Although USB is a hot-pluggable standard, Windows 2000 may
complain, bringing up an alert. The alert lets you install a control in
your taskbar to avoid potential problems in future.)
PowerLab Owner's Guide