User manual
suitable gain/amplification to display the curve within the full possible dynamic range.
Connect the edutool to the oscilloscope by means of a coaxial cable with BNC connectors.
Display the plethysmographic curve on the oscilloscope and watch how its shape is changing
in held breath and under the influence of movement artefacts. Read the heart frequency from
the plethysmographic curve, and draw the course of the plethysmographic curve.
Apparatusandaidsused
• S
p
O
2
simulator S
p
O
2
-200 pulse oxymetry simulator (BD Biomedical, USA)
• Edutool - model of the pulse oxymeter’s analogous part (ČVUT in Prague)
• Edutool for sensing the plethysmographic curve (ČVUT in Prague)
• Probe for sensing the plethysmographic curve
• Multimeter and cables terminated by a contact plug
• Two-channel oscilloscope, including 2 probes and a coaxial cable
• Adjustable double power supply (2x0-30 V, 1x5 V), including 6 supply conductors
terminated by a contact plug.
Measuredresults
Elaborate the measurement protocol from the laboratory task. Record the measured
values from task 1 for the individual pulse oxymeters into tables. Draw the measured signal
courses from task 2 into charts with descriptions of the axes and a corresponding scale.
Record the measured values from task 3 into a table and write out the calculation of the
R
ratio. Add the resulting SpO
2
value read from the conversion curve in Fig. 4.4 into the table of
measured values. Draw the plethysmographic curve from task 4 into a chart with descriptions
of the axes and a corresponding scale. Add important parameters describing the course of the
curve in the chart.
Conclusion
Briefly comment on each measurement point in the measurement protocol. Evaluate
the measured results and compare with data stated by the pulse oxymeter’s manufacturer in
the operation manual (ask your teacher for the operation/user manual). Determine the type of
the applied part the apparatus works with, the (electrical) insulation class, and the MD
classification class.
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