6
b) Relative Humidity :
30%～75%
c
) Atmospheric pressure:
700hPa～1060hPa
3 Principle
Principle of the Oximeter is as follows: An
experience formula of data process is established
taking use of Lambert Beer Law according to
Spectrum Absorption Characteristics of Reductive
Hemoglobin (Hb) and Oxyhemoglobin (HbO
2
) in
glow & near-infrared zones. Operation principle of
the device is: Photoelectric Oxyhemoglobin
Inspection Technology is adopted in accordance with
Capacity Pulse Scanning & Recording Technology,
so that two beams of different wavelength of lights
can be focused onto human nail tip through
perspective clamp finger-type sensor. Then
measured signal can be obtained by a photosensitive
element, information acquired through which will be
shown on screen through treatment in electronic
circuits and microprocessor.
Figure 1.
7
4 Technical specifications
4.1 Main performance
A.
SpO
2
value display
B.
Pulse rate value display, bar graph display
C.
Pulse waveform display
D.
Low-voltage indication: low-voltage indicator
appears before working abnormally which is due to
low-voltage
E.
The display mode can be changed
F
.
With SpO
2
value and pulse rate value of storage,
the stored data can be uploaded to computers
4.2 Main Parameters
A. Measurement of
SpO
2
Measuring range: 0%
～
100
％
Accuracy:
When the SpO
2
measuring range is 70%
～
100
％
,the
permission of absolute error is
±2％；
below 70% unspecified
B. Measurement of pulse rate
Measuring range:
30bpm～250bpm
Accuracy:
±
2 bpm or
±
2% (select larger)
C. Resolution
SpO
2
: 1%,
Pulse rate
: 1
bpm.
D. Measurement Performance in Weak Filling
Condition
