Nellcor N-200 Operator's Manual page 51

Guide to Operation
Using a ThinkJet Printer: Connect the ThinkJet printer to
the N-200, as described in the Connecting to Other Instruments
section. To print event data in graphic form, set the RS-232
format switches to graphics mode I or II as described in the
same section. To print events in graphic form, press the
EVENT button on the back of the N-200. The events are
printed when the button is released.
When event data is output on a ThinkJet printer, the earliest
data is in the top left of the page. The graph begins 30 seconds
before the beginning of each event, and an automatic marker
identifies the type of event (alarm limit [L] or user-defined [E]).
Each marker consists of a tick mark on the horizontal axis,
along with a letter that indicates the type of event and the time
of onset (for example, E15:10 identifies a user-defined event that
began at 3:10 p.m.). New scales are printed for each event. The
oxygen saturation scale is automatically selected, based on the
range of the data: the maximum value is 100% (the minimum
value is 50%, 25%, or 0%). The pulse rate scale is based on the
range of the measurements.
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