3-16 250 Series Maternal/Fetal Monitor Revision D
2020551-001
Installation: Service Mode Screens
Paper Volume
This field sets the volume of the paper chime. As you adjust the volume, a sample
tone sounds. You can choose from a range of 1 to 9 (1 = lowest,
9 = loudest).
HBC (Heartbeat Coincidence)
The heartbeat coincidence feature alerts you when there is the possibility that you
may be monitoring a duplicate signal. Heartbeat coincidence is indicated when any
two heartbeats have a consistent phase relationship for equal to or greater than 60%
of the detected beats for about 60 seconds; the cessation of coincidence is indicated
when the phase relationship is inconsistent for greater than 40% of the detected
beats for about 7 seconds.
When heartbeat coincidence detection is enabled, the acronym HBC appears to the
right of the FHR2 mode title.
HR Offset
This field is used to enable/disable the secondary offset feature. Use the Trim Knob
control to cycle through the available options: 10 min, On, and Off. (The factory
default setting is 10 min.)
What is it?
When monitoring dual heart rates using US/US2 or FECG/US, overlapping traces
may be difficult to interpret. All 250 Series Monitors provide a +20 bpm shift for the
secondary fetal heart rate trend to alleviate this problem. When using US/US2 or
FECG/US2, and the US2 trace is shifted +20 bpm, the symbol prints on
the upper portion of the top grid every 4.5 cm. When using US/FECG, and the US
trace is shifted +20 bpm, the symbol prints on the upper portion of the top
grid every 4.5 cm. In both cases, an arrow (→) and a vertical dashed line are printed
to draw attention to the start of the shifted trend.
10 min
The heart rate offset mode is enabled with an auto-revert feature. If the trace is
shifted by the user, the heart rate will revert back to the normal (unshifted) level
after 10 minutes.
On
The heart rate offset mode is enabled. If the user shifts a trace, the trace will remain
shifted until the user manually sets the trace back to normal (unshifted level).
Off
The heart rate offset mode is disabled. The user cannot shift traces.
NOTE: Refer to the operator’s manual for information about activating the heart
rate offset mode.
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