3
2.3. Environment requirements
Storage Environment
a) Temperature: -40°C
～
+60°C
b) Relative humidity: 5%
～
95%
c) Atmospheric pressure: 500hPa
～
1060hPa
Operating Environment
a) Temperature: 10°C
～
40°C
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.
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.
Screen brightness can be changed
F.
A pulse sound indication
G.
With alarm function
H.
With SpO
2
value and pulse rate value of storage, the stored data can be uploaded to computers
I.
It can be connected with an external oximeter probe
J.
Real-time data can be transmitted to computers
K.
Review function
L.
Clock function
