Renesas OB1203, Manual

Page: 15 / 19

OB1203 Certification Preparation, Setup, and Test Procedure
X0119984 Rev.1.0
Mar 11, 2021 Page 15
Table 3. Adjust IR AC Counts to Find 90% Sp02 Limits for Various Skin Types
1. Adjust IR AC to the minimum necessary to get a correct DUT SP02 Reading of 90%
4. Push Play and observe the SpO2 value on the DUT OLED display.
5. Increase the setting of the IR AC in small steps until the level is found where the value is within 3.5% of the
set value of 90%. Record the PI AND AC values in the IR box necessary to achieve a 90% Sp02 value. If the
PI is too low the reading can either be incorrect or not shown in the display. It is necessary that the DUT
does not display an incorrect value; therefore, the threshold must be determined and added to the software.
Note that the perfusion index can be increased by warming your finger.
6. Repeat this test for lines 2 and 3 of the table.
7.2 Determination of the Minimum Signal Strength Threshold
To calculate the threshold values for IR and Red, do the following:
1. Red AC Threshold ADC count = Red DC ADC count (from the DUT display) * PI (Red)
2. IR AC Threshold ADC count = IR DC ADC count (from the DUT display) * PI (IR)
Red DC [mV] IR DC [mV] IR AC [mV]
[1]
GUI Red
PI GUI IR PI
GUI IR
AC mV
DUT
SP02
Reading
Pass/Fail
86.5% to
93.5%
Dark skin 900
[1]
<FFRed> mV
See Table 2
350
[1]
<FFIR> mV
See Table 2
0.86
[1]
<FFIR> mV
Darker skin 450
[1]
<FFRed> mV
See Table 2
175
[1]
<FFIR> mV
See Table 2
1.7
[1]
<FFRIR> mV
Darkest skin 225
[1]
<FFRed> mV
See Table 2
100
[1]
<FFIR> mV
See Table 2
3.5
[1]
<FFIR> mV