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Explanation
Dark Measurement
Each measurement consists of “light measurement” and “dark measurement.”
“Light measurement” is performed with light from the object irradiating the sensor, while “dark
measurement” is performed with no light from the object irradiating the sensor to measure dark
current.
The final measured data is obtained by subtracting the measured data obtained in “dark measurement”
from the one obtained in “light measurement.” This method eliminates influences of the dark current of
the sensor itself, resulting in improved measurement accuracy.
Dark measurement modes
The following two modes are available for dark measurement with this instrument.
[STANDARD DARK] Measurement mode with dark measurement each time a measurement is
taken
[INTELLIGENT DARK] Measurement mode that corrects dark measurement values using correction
information from the sensor section while skipping dark measurements
Shortens measurement time while maintaining high accuracy.
* Factory default setting: [NORMAL, FAST, MANUAL, MULTI-NORMAL, MULTI-FAST] STANDARD DARK
[SUPER-FAST1, SUPER-FAST2] INTELLIGENT DARK
n Measurements in [INTELLIGENT DARK]
If the measurement conditions are changed after “dark measurement” is performed, perform the “dark
measurement” again.
If any of the following conditions occur during measurement, a “caution message” will appear on the
screen and measurement will stop.
(1) The last “dark measurement” was made within 20 minutes of startup [Caution: Warm-up not
completed]
(2) When more than 8 hours have elapsed since the last “dark measurement” [Caution: Long time
after last DARK]
(3) When there is a difference of 6°C or more compared to the temperature at the last “dark
measurement” [Warning: Temperature changed after last DARK]
If a caution message appears, you are recommended to perform a “dark measurement” and resume
measurement.
You can also choose to ignore the caution message to continue the measurement. If you choose to
ignore the caution message, the previous “dark measurement” value will be applied.
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