Ver1.2
VPOD OPERATOR＇S MANUAL
3
Figure 2.2 rear view
2.2 Install the batteries
The oximeter can be powered by 2 AA-Size alkaline batteries (which will typically provide 50 hours of continuous operation), or by the optional rechargeable NiMH battery pack.
When battery power is lower than 2.4V, the sign
will flicker in its display area. Replace the battery (or rechargeable NiMH battery pack) as soon as possible. The installation steps are shown as
figure 2.3.
Be sure to insert the batteries in the correct polarity,
as indicated by polarity marking (+ and -) inside the battery compartment.
Figure 2.3
2.3 Connect the sensor
Connect the oximeter sensor to the top of the oximeter as shown in figure 2.4. Ensure that the sensor is firmly plugged in.
Figure2.4
2.4 Monitoring
Clip the sensor to the patient’s finger, and ensure that the patient’s nail surface is facing upward, as shown in figure 2.5.
Fig2.5 Placement of the finger
2.4.1 Power on the oximeter
Press the function key (left key) to power it on. Several seconds later, the measurement value will appear.
Notice:
To maintain the highest degree of accuracy, it is recommended that the finger and the oximeter sensor/probe is kept as still as possible.
2.4.2 Brightness adjustment
When you press the function key (left key) for more than one second, the brightness level headed with “Br” will be shown on the top right of the screen. You can adjust the brightness by degrees by
pressing the setting key (right key). There are 10 levels of brightness. The default is level four.
Figure 2.6
2.4.3 Mode switch
After turning on the oximeter, each time the function key (left key) is pressed, the oximeter will switch to another display mode, shown as Figure 3.1.
2.5 Factors that may affect the measurement
During operation, the accuracy of oximetry readings can be affected by the following factors:
2.5.1 Instrument performance depends on the pulsatile character of the artery. The measurement would not be considered reliable and accurate if the following conditions are present during
measurement.
Shock or cardiac arrest
Temperature of the digit
After the administration of a cardiovascular drug
Anemia
Evidence of ventilation-perfusion mismatch
2.5.2 Instrument performance depends on the wavelength absorption for oxyhemoglobin and deoxyhemoglobin. If there are substances absorbing the same wavelength, this would induce false or
low SpO
2
values. The following may affect these values:
carboxyhemoglobin
methemoglobin
methylene blue
Indigo carmine
