Datascope Accutorr Plus Service Manual page 52

C. Performance Considerations
To insure optimal performance, use an appropriate sensor, apply it as directed, and observe
all warnings and cautions.
If excessive ambient light is present, cover the sensor site with opaque material. Failure
to do so may result in inaccurate measurements. Light sources that can affect performance
include surgical lights, especially those with a xenon light source, bilirubin lamps,
fluorescent lights, infrared heating lamps, and direct sunlight.
Special Features
D. Automatic Calibration
The oximetry subsystem incorporates automatic calibration mechanisms. Ic is
automatically calibrated each time it is turned on, at periodic intervals thereafter, and
whenever a new sensor is connected. Also, the intensity of the sensor's LEDs is adjusted
automatically to compensate for differences in tissue thickness.
Each sensor is calibrated when manufactured; the effective mean wavelength of the red
LED is determined and encoded into a calibration resistor in the sensor plug. The
instrument's software reads this calibration resistor to determine the appropriate
calibration coefficients for the measurements obtained by that sensor.
E. Oximetry Sensitivity Mode and Post Averaging Time
The Accutorr Plus sensitivity mode for SpO2 is set to normal and the averaging of the
saturation, pulse rate, and signal strength measurements for SpO is set to 8 seconds
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Chapter 1, Operation