Spectratech OEG-SpO2-01 Head Module
1) Light emitting part
Six units equipped
Built-in type LED with two waves (Wavelength 1: 840nm 2: 770nm)
Output power: 6.0mW/770nm, 6.0mW/840nm max. on surface of light emitting part
Safety of laser products (IEC 60825-1): Exempted
2) Light-receiving part
Six units equipped
Si PIN photo diode with visible light cutoff filter
3) Number of simultaneous measurement channels
16 channels
4) Distance between light injection part and optical light-receiving part

Note: The head module is assumed to use on the frontal lobe part that has few hairs. It is not recommended to use it on other part. In addition, even if it is measured on the frontal lobe with little hairs, the device's sensor may not sense because some of the examinees might have extremely weak signals. Please be forewarned.


Spectratech OEG-SpO2 Main unit
1) Measuring method of biological signal
Based on the modified Beer-Lambert Law
Hb change (ΔCoxy・L, ΔCdeoxy・L, ΔCtotal・L)  Unit: mMol・mm
Apparent SpO2 (Apparent arterial oxygen saturation)  Unit: %
2) Optical multi-modulation method
Modulation method: Spread spectrum modulation DS (Direct Sequence) method Note 1
PN CODE: M-sequence code (Code length: 65535 bits (Max))
Effective bandwidth of biological signal: Fine Mode: 0.76 Hz (Sampling interval: 0.65535sec)
Fast Mode: 6.10 Hz (Sampling interval: 0. 08192sec)
3) Event input function
It can input an event trigger manually at an appropriate time using the accessory box (Spectratech OEG-16-05 with entry acknowledge LED).
4) External trigger input function
(1) It equips two systems of the photo-isolated “external trigger input block” to work cooperatively with external devices. It is connected with external devices via BNC cable for external signal input (Spectratech OEG-16-04 accessory). It accepts the usage in both the external event trigger and external measurement/record start trigger.
Input condition: TTL level (Isolated by photo-coupler in the main unit) Note 2
(2) Possible to input from other PC via Network (Use of UDP protocol) Details of how to use from Network are described in §6 and §7 in Applied Technology Edition.
5) Measurement time
(1) AC power supply Continuous measurement: Up to about 10 hours (Fine Mode)
Up to about 2 hours (Fast Mode)
(2) Battery operation Continuous measurement for up to about 1 hour
6) Connection with PC
It is connected with PC with a USB port, and Windows XP, Windows VISTA or Windows 7 (32Bit OS or 64Bit OS) via the USB cable for PC connection (Spectratech OEG-16-06 accessory). And, Installation software (Spectratech OEG-SpO2-07 accessory) is installed so that PC can output various commands, and record or display the measurement data received. As for PC performance, Intel I5 CPU or above, and 4GB main memory or above are required.
7) Built-in battery
For main part of Main unit: 4 x AA battery (Continuous operation for about 1 hour)
For photo isolation part: 2 x AA battery (Continuous operation for about 6 months)
For internal clock: CR2032 Lithium battery (Continuous operation for about 3~5 years)
8) The latest firmware can be downloaded from our website as needed.

Note 1: The DS (Direct Sequence) method is one of the spread spectrum signal generation methods, called direct diffusion method as well, and modulates by using the random numbers called spread code sequence (PN sequence). In addition, there is FH method (Frequency Hopping) method.
Note 2: TTL input means +3~+5V digital signal input at high impedance.



To top of page