It is the power switch. Pushing the upper part turns it ON. When the power is supplied by either of AC adaptor or battery and it is ready to operate, LED on the button lights up.

It is the button to start measurement/recording. Pushing the button will start measurement/　recording, and LED on the button lights up to indicate starting operation. Pushing the button cannot start operation unless an in vivo calibration was done with CAL button, and CAL LED lights up.

It is the button to stop measurement/recording. Pushing the button will stop the measurement/　recording. Green LED in the button lights up to indicate the confirmation of the stop. When not connected with PC, multiple tasks can be measured and recorded by repeating START/STOP. Recording time of the record memory in Main unit is about two hours for Fast Mode, and about ten hours for Fine Mode.

The button is pushed when an event trigger is input manually from the front side of Main unit. It corresponds only when it is being measured. The manual event trigger input is prepared also on the rear side of Main unit.

It is the button for the in-vivo calibration. In case of AUTO mode , please push the button once before beginning a measurement after installing the head module to a live body. The LED blinks during the calibration, and becomes in lighting-up state when the calibration ended, then it is possible to measure. It always lights up in case of MANUAL mode, and it can start a recording at any time without performing the calibration process.

It lights up (Red) when the capacity of the battery (4 x AA battery) for the main part of Main unit fell to less than the rated value, it lights up (Red). In case of battery operation, please exchange the battery with charged one soon when the LED lighted up. Continuous operating time of the battery is limited in one hour. This LED may warn in the blinking state besides the lighting on.

Cable L for SpectratechOEG-SpO2-01 Head module is connected to.

Cable R for SpectratechOEG-SpO2-01 Head module is connected to.

It is used for the measurement/recording start input or the event trigger input from external devices via Spectratech OEG-16-04 BNC cable for external signal input. It is necessary to have mounted 2xAA dry cell to use this input. It can be used also by connecting the accessory BOX for Spectratech OEG-16-05 manual event trigger input .

It is used for the event trigger input from external devices via Spectratech OEG-16-04 BNC cable for external signal input. It is necessary to have mounted 2xAA dry cell to use this input. It can be used also by connecting the accessory BOX for Spectratech OEG-16-05 manual event trigger input.

Cable from Spectratech OEG-16-05 Box for manual event trigger input is connected to. An event trigger can be input manually from this Box besides EVENT switch on the front side of Main unit. Green LED on the Box lights up when an event trigger was accepted.

It is connected to PC with Spectratech OEG-16-06 USB cable for PC connection when various commands are given to Spectratech OEG-SpO2 Main unit from USB, or PC receives measurement data from Main unit.

Cable from the attached AC adaptor is connected to. It is used when operating by connecting to PC, or the battery operation is not wanted despite an independent operation by Main unit.

For main part of Main unit Battery
Please equip the battery set in case of battery-powered operation of Spectratech OEG-SpO2 Main unit. It consists of four AA batteries. It is capable of continuous operation for about 1 hour. When the capacity becomes insufficient, BATT-LED on the front side of Main unit lights up (Red) to warn it. When the LED lighted up, please exchange the battery set with charged one soon. When the LED turned on during a measurement/recording, the recording is automatically ended, the data is saved, and it is put into halt state.

For photo isolation part
The battery set is used when EXT-EVENT-IN 1 or EXT-EVENT-IN 2 of Spectratech OEG-SpO2 Main unit is connected to external device. It consists of two AA batteries. Since use of this battery makes a complete optical isolation between an external device and Main unit, external devices can be connected safely. It can be used continuously for about 6 months. When EXT-EVENT-IN1 or 2 is not used, this battery need not be equipped.