Other Data Indications
The Over State Indication (OVR)
If the value of the numeric data item in the vital sign box is greater than the highest value
specified for the item, OVR will be displayed in an alarm condition in place of the numeric. See the
table on page 4‐25 for measurement range and declaration information.
The Under State Indication (UND)
If the value of the numeric data item in the vital sign box is less than the lowest value specified for
the item, UND will be displayed in place of the numeric in an alarm condition. See the table on
page 4‐25 for measurement range and declaration information.
Vital Sign Traces and System Message Area
Vital sign (VS) traces are uniquely colored waveforms for the ECG, SPO2, CO2 and invasive blood
pressure parameters. These traces are fixed across the screen, adjustable and updated from left
to right with an erase bar. The waveform color corresponds to the color of the associated VS box
numeric data for that parameter. Up to six waveforms can be displayed, but if a parameter is
turned off then that trace portion of the screen and VS box will be blank.
System messages and some alarm flags, as detailed throughout this manual, are displayed in the
center and top portions of the vital sign traces area. Multiple system messages or alarm flags will
be stacked in this area.
Expression MR400 Instructions for Use System Overview 2‐21
Trace A displayed as the ECG 1 waveform depending upon the
Trace B displayed as the ECG 2 waveform when two ECG
sources are selected
Trace C displays the SpO2 waveform