Andor Technology iXon Ultra 897 User Manual page 87

The illustration below shows typical use of Background, Reference and Signal for
computations such as %Absorptance or %Transmittance.
Use of Background, Reference and Signal
Example: Percentage Transmittance, Absorptance
Background
Reference
Signal
The default data type (used when you capture data and have not explicitly made a
selection from the Data Type Dialog Box) is Counts.
If you select background corrected counts as your data type - Counts (Bg
Corrected) - you will have to perform Take Background before you perform
Take Signal (see SECTION 4.4 DATA ACQUISITION - Making an Acquisition).
If you select any data type other than Counts or Counts (Bg Corrected) you will have
to perform Take Background and Take Reference (in that order) before
performing Take Signal.
light source sample
off empty
on empty
on full
CHOOSING THE DATA TYPE
detector
Andor CCD
InstaSpec IV
Andor CCD
Andor CCD
Page 87
Section 4 . 6