Bio-Rad Model 680 Microplate Reader Accessories - Manual (Page 32)

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b. Cutoff Control setting
Selection of Single/Ranged Cutoff Control
This menu screen selects Single or Ranged cutoff type. The cutoff type marked
with “[ ]” is the current selection. The Enter key seals the selection and resumes
to the next setting screen.
Single Cutoff Control
The Numerical keys are used to enter the gray zone value.
The unit is fixed to "Abs". The Enter key sets the value of the
cutoff control and returns to the previous screen.
Ranged Cutoff Control
There is no parameter to set for the ranged cutoff control.
The Enter key returns to the previous screen.
NOTE:
The "CNx" means the mean absorbance value of Negative
control wells and the "CPx" means the mean absorbance
value of Positive control wells. These wells are defined in the
plate map setting. The cutoff is done with the Positive and
Negative value to the absorbance value of each well.
Positive >= CNx
Gray zone: 50 %
Unit: Abs
Positive >= CPx
Negative < CNx
Unit: Abs
Enter key to accept
»■Ranged cutoff
[Single cutoff]
Single cutoff
Ranged