8. Troubleshooting
1.
If the Human NIBP Nano is returning error messages or failing to start a
measurement, it is recommended to:
•
Disconnect the finger cuff air hoses from the Wrist Unit.
•
Shut down LabChart.
•
Turn the Human NIBP Nano Interface off and back on.
•
Unplug the USB cable, then reconnect it.
•
Reapply the finger cuff (s).
•
Restart LabChart before resuming a measurement.
2.
Operating conditions
•
The Human NIBP Nano has a narrow temperature operating range (10–40 °C)
and should be placed apart from other equipment for optimal operation.
•
It is best to perform measurements at room temperature.
•
It is important to keep the hand warm during ambulatory measurements.
•
If blood pressure is measured on cold fingers, the measurement can be diff icult
or even impossible.
3.
Height correction
•
The height reference level should be selected carefully. If the subject is walking
or sitting it is best to place the reference part on the chest at the level of the
right atrium in the mid-axillary line.
•
In the recumbent (lying) position it is best to place the reference ending at mid-
chest level.
•
If the experiment focuses on the dynamic response of the hemodynamic system
aft er a change in posture it is usually best to keep both the transducer and the
reference ending at the level of the right atrium to avoid a dynamic response of
the height correction system.
•
As a general rule, try to keep the cuff ed fingers approximately at heart level,
even with a connected height correction unit. The HCU pressure should not
exceed ±20 mmHg.
•
The HCU tubing should be free of bends and unobstructed in any way.
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