User manual

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meaning: K1 - oscillator’s clock pulses, K2, K3 - managing impulses of the R/IR diodes, K4

- output signal of the input amplifier, K5, K6 - managing signals of the S/H circuits, Sample

and Hold circuits, K7, K8 - sensed signal divided into two channels, K9, K10 - DC (direct)

components of the R/IR signal (measure by means of a digital voltmeter/multimeter), K11,

K12 - AC (alternating) components of the R/IR signal, K13, K14 - voltage value of the

AC component of the R/IR signal (measure by means of a digital voltmeter/multimeter).

Record the signals from the check points K4, K7, K8, K11 and K12 into charts.

Fig. 4.7: An edutool of a pulse oxymeter’s analogue part (left) and an edutool for sensing the

plethysmographic curve (right.)

Ad task 3)

Use the digital voltmeter/multimeter to measure the values of

and IR

- the direct

components of red light and infrared radiation in check points K9, K10, and the values of

and

- alternating components of red light and infrared radiation in check points K13,

K14. Establish the measured values into (4.2) and calculate the ratio

R. Read the particular

saturation value from the chart in Fig. 4.4.

Ad task 4)

A specialized probe with a finger clip is attached to the edutool for sensing the

plethysmographic curve (Fig. 4.7 on the left). You must be very careful in manipulating with

this probe. Namely the supply cable must not be twisted. If you look inside the clip, you will

see a soft lining and inlets for the transmitting and receiving diodes. There are two

potentiometers on the edutool, one marked as OFFSET, which allows for setting a shift of the

entire curve in a vertical direction, and the other marked as GAIN, which allows for setting a